summaryrefslogtreecommitdiff
path: root/doc/api/deprecations.md
blob: 9db1598e3a1942dd417c891f6331ba27d475dffe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
# Deprecated APIs

<!--introduced_in=v7.7.0-->
<!-- type=misc -->

Node.js may deprecate APIs for any of the following reasons:

* Use of the API is unsafe.
* An improved alternative API is available.
* Breaking changes to the API are expected in a future major release.

Node.js utilizes three kinds of Deprecations:

* Documentation-only
* Runtime
* End-of-Life

A Documentation-only deprecation is one that is expressed only within the
Node.js API docs. These generate no side-effects while running Node.js.
Some Documentation-only deprecations trigger a runtime warning when launched
with [`--pending-deprecation`][] flag (or its alternative,
`NODE_PENDING_DEPRECATION=1` environment variable), similarly to Runtime
deprecations below. Documentation-only deprecations that support that flag
are explicitly labeled as such in the
[list of Deprecated APIs](#deprecations_list_of_deprecated_apis).

A Runtime deprecation will, by default, generate a process warning that will
be printed to `stderr` the first time the deprecated API is used. When the
[`--throw-deprecation`][] command-line flag is used, a Runtime deprecation will
cause an error to be thrown.

An End-of-Life deprecation is used when functionality is or will soon be removed
from Node.js.

## Revoking deprecations

Occasionally, the deprecation of an API may be reversed. In such situations,
this document will be updated with information relevant to the decision.
However, the deprecation identifier will not be modified.

## List of Deprecated APIs

<a id="DEP0001"></a>
### DEP0001: `http.OutgoingMessage.prototype.flush`
<!-- YAML
changes:
  - version: v14.0.0
    pr-url: https://github.com/nodejs/node/pull/31164
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v1.6.0
    pr-url: https://github.com/nodejs/node/pull/1156
    description: Runtime deprecation.
-->

Type: End-of-Life

`OutgoingMessage.prototype.flush()` has been removed. Use
`OutgoingMessage.prototype.flushHeaders()` instead.

<a id="DEP0002"></a>
### DEP0002: `require('_linklist')`
<!-- YAML
changes:
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/12113
    description: End-of-Life.
  - version: v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v5.0.0
    pr-url: https://github.com/nodejs/node/pull/3078
    description: Runtime deprecation.
-->

Type: End-of-Life

The `_linklist` module is deprecated. Please use a userland alternative.

<a id="DEP0003"></a>
### DEP0003: `_writableState.buffer`
<!-- YAML
changes:
  - version: v14.0.0
    pr-url: https://github.com/nodejs/node/pull/31165
    description: End-of-Life
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.11.15
    pr-url: https://github.com/nodejs/node-v0.x-archive/pull/8826
    description: Runtime deprecation.
-->

Type: End-of-Life

The `_writableState.buffer` has been removed. Use `_writableState.getBuffer()`
instead.

<a id="DEP0004"></a>
### DEP0004: `CryptoStream.prototype.readyState`
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/17882
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: 0.4.0
    commit: 9c7f89bf56abd37a796fea621ad2e47dd33d2b82
    description: Documentation-only deprecation.
-->

Type: End-of-Life

The `CryptoStream.prototype.readyState` property was removed.

<a id="DEP0005"></a>
### DEP0005: `Buffer()` constructor
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/19524
    description: Runtime deprecation.
  - version: v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v6.0.0
    pr-url: https://github.com/nodejs/node/pull/4682
    description: Documentation-only deprecation.
-->

Type: Runtime (supports [`--pending-deprecation`][])

The `Buffer()` function and `new Buffer()` constructor are deprecated due to
API usability issues that can lead to accidental security issues.

As an alternative, use one of the following methods of constructing `Buffer`
objects:

* [`Buffer.alloc(size[, fill[, encoding]])`][alloc]: Create a `Buffer` with
  *initialized* memory.
* [`Buffer.allocUnsafe(size)`][alloc_unsafe_size]: Create a `Buffer` with
  *uninitialized* memory.
* [`Buffer.allocUnsafeSlow(size)`][]: Create a `Buffer` with *uninitialized*
   memory.
* [`Buffer.from(array)`][]: Create a `Buffer` with a copy of `array`
* [`Buffer.from(arrayBuffer[, byteOffset[, length]])`][from_arraybuffer] -
  Create a `Buffer` that wraps the given `arrayBuffer`.
* [`Buffer.from(buffer)`][]: Create a `Buffer` that copies `buffer`.
* [`Buffer.from(string[, encoding])`][from_string_encoding]: Create a `Buffer`
  that copies `string`.

Without `--pending-deprecation`, runtime warnings occur only for code not in
`node_modules`. This means there will not be deprecation warnings for
`Buffer()` usage in dependencies. With `--pending-deprecation`, a runtime
warning results no matter where the `Buffer()` usage occurs.

<a id="DEP0006"></a>
### DEP0006: `child_process` `options.customFds`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/25279
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.11.14
    description: Runtime deprecation.
  - version: v0.5.11
    description: Documentation-only deprecation.
-->

Type: End-of-Life

Within the [`child_process`][] module's `spawn()`, `fork()`, and `exec()`
methods, the `options.customFds` option is deprecated. The `options.stdio`
option should be used instead.

<a id="DEP0007"></a>
### DEP0007: Replace `cluster` `worker.suicide` with `worker.exitedAfterDisconnect`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/13702
    description: End-of-Life.
  - version: v7.0.0
    pr-url: https://github.com/nodejs/node/pull/3747
    description: Runtime deprecation.
  - version: v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v6.0.0
    pr-url: https://github.com/nodejs/node/pull/3743
    description: Documentation-only deprecation.
-->

Type: End-of-Life

In an earlier version of the Node.js `cluster`, a boolean property with the name
`suicide` was added to the `Worker` object. The intent of this property was to
provide an indication of how and why the `Worker` instance exited. In Node.js
6.0.0, the old property was deprecated and replaced with a new
[`worker.exitedAfterDisconnect`][] property. The old property name did not
precisely describe the actual semantics and was unnecessarily emotion-laden.

<a id="DEP0008"></a>
### DEP0008: `require('constants')`
<!-- YAML
changes:
  - version: v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v6.3.0
    pr-url: https://github.com/nodejs/node/pull/6534
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The `constants` module is deprecated. When requiring access to constants
relevant to specific Node.js builtin modules, developers should instead refer
to the `constants` property exposed by the relevant module. For instance,
`require('fs').constants` and `require('os').constants`.

<a id="DEP0009"></a>
### DEP0009: `crypto.pbkdf2` without digest
<!-- YAML
changes:
  - version: v14.0.0
    pr-url: https://github.com/nodejs/node/pull/31166
    description: End-of-Life (for `digest === null`)
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/22861
    description: Runtime deprecation (for `digest === null`).
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/11305
    description: End-of-Life (for `digest === undefined`).
  - version: v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v6.0.0
    pr-url: https://github.com/nodejs/node/pull/4047
    description: Runtime deprecation (for `digest === undefined`).
-->

Type: End-of-Life

Use of the [`crypto.pbkdf2()`][] API without specifying a digest was deprecated
in Node.js 6.0 because the method defaulted to using the non-recommended
`'SHA1'` digest. Previously, a deprecation warning was printed. Starting in
Node.js 8.0.0, calling `crypto.pbkdf2()` or `crypto.pbkdf2Sync()` with
`digest` set to `undefined` will throw a `TypeError`.

Beginning in Node.js v11.0.0, calling these functions with `digest` set to
`null` would print a deprecation warning to align with the behavior when `digest`
is `undefined`.

Now, however, passing either `undefined` or `null` will throw a `TypeError`.

<a id="DEP0010"></a>
### DEP0010: `crypto.createCredentials`
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/21153
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.11.13
    pr-url: https://github.com/nodejs/node-v0.x-archive/pull/7265
    description: Runtime deprecation.
-->

Type: End-of-Life

The `crypto.createCredentials()` API was removed. Please use
[`tls.createSecureContext()`][] instead.

<a id="DEP0011"></a>
### DEP0011: `crypto.Credentials`
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/21153
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.11.13
    pr-url: https://github.com/nodejs/node-v0.x-archive/pull/7265
    description: Runtime deprecation.
-->

Type: End-of-Life

The `crypto.Credentials` class was removed. Please use [`tls.SecureContext`][]
instead.

<a id="DEP0012"></a>
### DEP0012: `Domain.dispose`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/15412
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.11.7
    pr-url: https://github.com/nodejs/node-v0.x-archive/pull/5021
    description: Runtime deprecation.
-->

Type: End-of-Life

`Domain.dispose()` has been removed. Recover from failed I/O actions
explicitly via error event handlers set on the domain instead.

<a id="DEP0013"></a>
### DEP0013: `fs` asynchronous function without callback
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18668
    description: End-of-Life.
  - version: v7.0.0
    pr-url: https://github.com/nodejs/node/pull/7897
    description: Runtime deprecation.
-->

Type: End-of-Life

Calling an asynchronous function without a callback throws a `TypeError`
in Node.js 10.0.0 onwards. See <https://github.com/nodejs/node/pull/12562>.

<a id="DEP0014"></a>
### DEP0014: `fs.read` legacy String interface
<!-- YAML
changes:
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/9683
    description: End-of-Life.
  - version: v6.0.0
    pr-url: https://github.com/nodejs/node/pull/4525
    description: Runtime deprecation.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.1.96
    commit: c93e0aaf062081db3ec40ac45b3e2c979d5759d6
    description: Documentation-only deprecation.
-->

Type: End-of-Life

The [`fs.read()`][] legacy `String` interface is deprecated. Use the `Buffer`
API as mentioned in the documentation instead.

<a id="DEP0015"></a>
### DEP0015: `fs.readSync` legacy String interface
<!-- YAML
changes:
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/9683
    description: End-of-Life.
  - version: v6.0.0
    pr-url: https://github.com/nodejs/node/pull/4525
    description: Runtime deprecation.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.1.96
    commit: c93e0aaf062081db3ec40ac45b3e2c979d5759d6
    description: Documentation-only deprecation.
-->

Type: End-of-Life

The [`fs.readSync()`][] legacy `String` interface is deprecated. Use the
`Buffer` API as mentioned in the documentation instead.

<a id="DEP0016"></a>
### DEP0016: `GLOBAL`/`root`
<!-- YAML
changes:
  - version: v14.0.0
    pr-url: https://github.com/nodejs/node/pull/31167
    description: End-of-Life
  - version: v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v6.0.0
    pr-url: https://github.com/nodejs/node/pull/1838
    description: Runtime deprecation.
-->

Type: End-of-Life

The `GLOBAL` and `root` aliases for the `global` property were deprecated
in Node.js 6.0.0 and have since been removed.

<a id="DEP0017"></a>
### DEP0017: `Intl.v8BreakIterator`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/15238
    description: End-of-Life.
  - version: v7.0.0
    pr-url: https://github.com/nodejs/node/pull/8908
    description: Runtime deprecation.
-->

Type: End-of-Life

`Intl.v8BreakIterator` was a non-standard extension and has been removed.
See [`Intl.Segmenter`](https://github.com/tc39/proposal-intl-segmenter).

<a id="DEP0018"></a>
### DEP0018: Unhandled promise rejections
<!-- YAML
changes:
  - version: v7.0.0
    pr-url: https://github.com/nodejs/node/pull/8217
    description: Runtime deprecation.
-->

Type: Runtime

Unhandled promise rejections are deprecated. In the future, promise rejections
that are not handled will terminate the Node.js process with a non-zero exit
code.

<a id="DEP0019"></a>
### DEP0019: `require('.')` resolved outside directory
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/26973
    description: Removed functionality.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v1.8.1
    pr-url: https://github.com/nodejs/node/pull/1363
    description: Runtime deprecation.
-->

Type: End-of-Life

In certain cases, `require('.')` could resolve outside the package directory.
This behavior has been removed.

<a id="DEP0020"></a>
### DEP0020: `Server.connections`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.9.7
    pr-url: https://github.com/nodejs/node-v0.x-archive/pull/4595
    description: Runtime deprecation.
-->

Type: Runtime

The [`Server.connections`][] property is deprecated. Please use the
[`Server.getConnections()`][] method instead.

<a id="DEP0021"></a>
### DEP0021: `Server.listenFD`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/27127
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.7.12
    commit: 41421ff9da1288aa241a5e9dcf915b685ade1c23
    description: Runtime deprecation.
-->

Type: End-of-Life

The `Server.listenFD()` method was deprecated and removed. Please use
[`Server.listen({fd: <number>})`][] instead.

<a id="DEP0022"></a>
### DEP0022: `os.tmpDir()`
<!-- YAML
changes:
  - version: v14.0.0
    pr-url: https://github.com/nodejs/node/pull/31169
    description: End-of-Life.
  - version: v7.0.0
    pr-url: https://github.com/nodejs/node/pull/6739
    description: Runtime deprecation.
-->

Type: End-of-Life

The `os.tmpDir()` API was deprecated in Node.js 7.0.0 and has since been
removed. Please use [`os.tmpdir()`][] instead.

<a id="DEP0023"></a>
### DEP0023: `os.getNetworkInterfaces()`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/25280
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.6.0
    commit: 37bb37d151fb6ee4696730e63ff28bb7a4924f97
    description: Runtime deprecation.
-->

Type: End-of-Life

The `os.getNetworkInterfaces()` method is deprecated. Please use the
[`os.networkInterfaces()`][] method instead.

<a id="DEP0024"></a>
### DEP0024: `REPLServer.prototype.convertToContext()`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/13434
    description: End-of-Life.
  - version: v7.0.0
    pr-url: https://github.com/nodejs/node/pull/7829
    description: Runtime deprecation.
-->

Type: End-of-Life

The `REPLServer.prototype.convertToContext()` API has been removed.

<a id="DEP0025"></a>
### DEP0025: `require('sys')`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v1.0.0
    pr-url: https://github.com/nodejs/node/pull/317
    description: Runtime deprecation.
-->

Type: Runtime

The `sys` module is deprecated. Please use the [`util`][] module instead.

<a id="DEP0026"></a>
### DEP0026: `util.print()`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/25377
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.11.3
    commit: 896b2aa7074fc886efd7dd0a397d694763cac7ce
    description: Runtime deprecation.
-->

Type: End-of-Life

`util.print()` has been removed. Please use [`console.log()`][] instead.

<a id="DEP0027"></a>
### DEP0027: `util.puts()`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/25377
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.11.3
    commit: 896b2aa7074fc886efd7dd0a397d694763cac7ce
    description: Runtime deprecation.
-->

Type: End-of-Life

`util.puts()` has been removed. Please use [`console.log()`][] instead.

<a id="DEP0028"></a>
### DEP0028: `util.debug()`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/25377
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.11.3
    commit: 896b2aa7074fc886efd7dd0a397d694763cac7ce
    description: Runtime deprecation.
-->

Type: End-of-Life

`util.debug()` has been removed. Please use [`console.error()`][] instead.

<a id="DEP0029"></a>
### DEP0029: `util.error()`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/25377
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.11.3
    commit: 896b2aa7074fc886efd7dd0a397d694763cac7ce
    description: Runtime deprecation.
-->

Type: End-of-Life

`util.error()` has been removed. Please use [`console.error()`][] instead.

<a id="DEP0030"></a>
### DEP0030: `SlowBuffer`
<!-- YAML
changes:
  - version: v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v6.0.0
    pr-url: https://github.com/nodejs/node/pull/5833
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`SlowBuffer`][] class is deprecated. Please use
[`Buffer.allocUnsafeSlow(size)`][] instead.

<a id="DEP0031"></a>
### DEP0031: `ecdh.setPublicKey()`
<!-- YAML
changes:
  - version: v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v5.2.0
    pr-url: https://github.com/nodejs/node/pull/3511
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`ecdh.setPublicKey()`][] method is now deprecated as its inclusion in the
API is not useful.

<a id="DEP0032"></a>
### DEP0032: `domain` module
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v1.4.2
    pr-url: https://github.com/nodejs/node/pull/943
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`domain`][] module is deprecated and should not be used.

<a id="DEP0033"></a>
### DEP0033: `EventEmitter.listenerCount()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v3.2.0
    pr-url: https://github.com/nodejs/node/pull/2349
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`EventEmitter.listenerCount(emitter, eventName)`][] API is
deprecated. Please use [`emitter.listenerCount(eventName)`][] instead.

<a id="DEP0034"></a>
### DEP0034: `fs.exists(path, callback)`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v1.0.0
    pr-url: https://github.com/iojs/io.js/pull/166
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`fs.exists(path, callback)`][] API is deprecated. Please use
[`fs.stat()`][] or [`fs.access()`][] instead.

<a id="DEP0035"></a>
### DEP0035: `fs.lchmod(path, mode, callback)`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.4.7
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`fs.lchmod(path, mode, callback)`][] API is deprecated.

<a id="DEP0036"></a>
### DEP0036: `fs.lchmodSync(path, mode)`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.4.7
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`fs.lchmodSync(path, mode)`][] API is deprecated.

<a id="DEP0037"></a>
### DEP0037: `fs.lchown(path, uid, gid, callback)`
<!-- YAML
changes:
  - version: v10.6.0
    pr-url: https://github.com/nodejs/node/pull/21498
    description: Deprecation revoked.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.4.7
    description: Documentation-only deprecation.
-->

Type: Deprecation revoked

The [`fs.lchown(path, uid, gid, callback)`][] API was deprecated. The
deprecation was revoked because the requisite supporting APIs were added in
libuv.

<a id="DEP0038"></a>
### DEP0038: `fs.lchownSync(path, uid, gid)`
<!-- YAML
changes:
  - version: v10.6.0
    pr-url: https://github.com/nodejs/node/pull/21498
    description: Deprecation revoked.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.4.7
    description: Documentation-only deprecation.
-->

Type: Deprecation revoked

The [`fs.lchownSync(path, uid, gid)`][] API was deprecated. The deprecation was
revoked because the requisite supporting APIs were added in libuv.

<a id="DEP0039"></a>
### DEP0039: `require.extensions`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.10.6
    commit: 7bd8a5a2a60b75266f89f9a32877d55294a3881c
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`require.extensions`][] property is deprecated.

<a id="DEP0040"></a>
### DEP0040: `punycode` module
<!-- YAML
changes:
  - version: v7.0.0
    pr-url: https://github.com/nodejs/node/pull/7941
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`punycode`][] module is deprecated. Please use a userland alternative
instead.

<a id="DEP0041"></a>
### DEP0041: `NODE_REPL_HISTORY_FILE` environment variable
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/13876
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v3.0.0
    pr-url: https://github.com/nodejs/node/pull/2224
    description: Documentation-only deprecation.
-->

Type: End-of-Life

The `NODE_REPL_HISTORY_FILE` environment variable was removed. Please use
`NODE_REPL_HISTORY` instead.

<a id="DEP0042"></a>
### DEP0042: `tls.CryptoStream`
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/17882
    description: End-of-Life.
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v0.11.3
    commit: af80e7bc6e6f33c582eb1f7d37c7f5bbe9f910f7
    description: Documentation-only deprecation.
-->

Type: End-of-Life

The [`tls.CryptoStream`][] class was removed. Please use
[`tls.TLSSocket`][] instead.

<a id="DEP0043"></a>
### DEP0043: `tls.SecurePair`
<!-- YAML
changes:
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/11349
    description: Runtime deprecation.
  - version: v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v6.0.0
    pr-url: https://github.com/nodejs/node/pull/6063
    description: Documentation-only deprecation.
  - version: v0.11.15
    pr-url:
      - https://github.com/nodejs/node-v0.x-archive/pull/8695
      - https://github.com/nodejs/node-v0.x-archive/pull/8700
    description: Deprecation revoked.
  - version: v0.11.3
    commit: af80e7bc6e6f33c582eb1f7d37c7f5bbe9f910f7
    description: Runtime deprecation.
-->

Type: Documentation-only

The [`tls.SecurePair`][] class is deprecated. Please use
[`tls.TLSSocket`][] instead.

<a id="DEP0044"></a>
### DEP0044: `util.isArray()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isArray()`][] API is deprecated. Please use `Array.isArray()`
instead.

<a id="DEP0045"></a>
### DEP0045: `util.isBoolean()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isBoolean()`][] API is deprecated.

<a id="DEP0046"></a>
### DEP0046: `util.isBuffer()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isBuffer()`][] API is deprecated. Please use
[`Buffer.isBuffer()`][] instead.

<a id="DEP0047"></a>
### DEP0047: `util.isDate()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isDate()`][] API is deprecated.

<a id="DEP0048"></a>
### DEP0048: `util.isError()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isError()`][] API is deprecated.

<a id="DEP0049"></a>
### DEP0049: `util.isFunction()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isFunction()`][] API is deprecated.

<a id="DEP0050"></a>
### DEP0050: `util.isNull()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isNull()`][] API is deprecated.

<a id="DEP0051"></a>
### DEP0051: `util.isNullOrUndefined()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isNullOrUndefined()`][] API is deprecated.

<a id="DEP0052"></a>
### DEP0052: `util.isNumber()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isNumber()`][] API is deprecated.

<a id="DEP0053"></a>
### DEP0053 `util.isObject()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isObject()`][] API is deprecated.

<a id="DEP0054"></a>
### DEP0054: `util.isPrimitive()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isPrimitive()`][] API is deprecated.

<a id="DEP0055"></a>
### DEP0055: `util.isRegExp()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isRegExp()`][] API is deprecated.

<a id="DEP0056"></a>
### DEP0056: `util.isString()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isString()`][] API is deprecated.

<a id="DEP0057"></a>
### DEP0057: `util.isSymbol()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isSymbol()`][] API is deprecated.

<a id="DEP0058"></a>
### DEP0058: `util.isUndefined()`
<!-- YAML
changes:
  - version:
    - v4.8.6
    - v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version:
    - v3.3.1
    - v4.0.0
    pr-url: https://github.com/nodejs/node/pull/2447
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.isUndefined()`][] API is deprecated.

<a id="DEP0059"></a>
### DEP0059: `util.log()`
<!-- YAML
changes:
  - version: v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v6.0.0
    pr-url: https://github.com/nodejs/node/pull/6161
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util.log()`][] API is deprecated.

<a id="DEP0060"></a>
### DEP0060: `util._extend()`
<!-- YAML
changes:
  - version: v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v6.0.0
    pr-url: https://github.com/nodejs/node/pull/4903
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`util._extend()`][] API is deprecated.

<a id="DEP0061"></a>
### DEP0061: `fs.SyncWriteStream`
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/20735
    description: End-of-Life.
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/10467
    description: Runtime deprecation.
  - version: v7.0.0
    pr-url: https://github.com/nodejs/node/pull/6749
    description: Documentation-only deprecation.
-->

Type: End-of-Life

The `fs.SyncWriteStream` class was never intended to be a publicly accessible
API and has been removed. No alternative API is available. Please use a userland
alternative.

<a id="DEP0062"></a>
### DEP0062: `node --debug`
<!-- YAML
changes:
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/10970
    description: Runtime deprecation.
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/25828
    description: End-of-Life.
-->

Type: End-of-Life

`--debug` activates the legacy V8 debugger interface, which was removed as
of V8 5.8. It is replaced by Inspector which is activated with `--inspect`
instead.

<a id="DEP0063"></a>
### DEP0063: `ServerResponse.prototype.writeHeader()`
<!-- YAML
changes:
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/11355
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The `http` module `ServerResponse.prototype.writeHeader()` API is
deprecated. Please use `ServerResponse.prototype.writeHead()` instead.

The `ServerResponse.prototype.writeHeader()` method was never documented as an
officially supported API.

<a id="DEP0064"></a>
### DEP0064: `tls.createSecurePair()`
<!-- YAML
changes:
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/11349
    description: Runtime deprecation.
  - version: v6.12.0
    pr-url: https://github.com/nodejs/node/pull/10116
    description: A deprecation code has been assigned.
  - version: v6.0.0
    pr-url: https://github.com/nodejs/node/pull/6063
    description: Documentation-only deprecation.
  - version: v0.11.15
    pr-url:
      - https://github.com/nodejs/node-v0.x-archive/pull/8695
      - https://github.com/nodejs/node-v0.x-archive/pull/8700
    description: Deprecation revoked.
  - version: v0.11.3
    commit: af80e7bc6e6f33c582eb1f7d37c7f5bbe9f910f7
    description: Runtime deprecation.
-->

Type: Runtime

The `tls.createSecurePair()` API was deprecated in documentation in Node.js
0.11.3. Users should use `tls.Socket` instead.

<a id="DEP0065"></a>
### DEP0065: `repl.REPL_MODE_MAGIC` and `NODE_REPL_MODE=magic`
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/19187
    description: End-of-Life.
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/11599
    description: Documentation-only deprecation.
-->

Type: End-of-Life

The `repl` module's `REPL_MODE_MAGIC` constant, used for `replMode` option, has
been removed. Its behavior has been functionally identical to that of
`REPL_MODE_SLOPPY` since Node.js 6.0.0, when V8 5.0 was imported. Please use
`REPL_MODE_SLOPPY` instead.

The `NODE_REPL_MODE` environment variable is used to set the underlying
`replMode` of an interactive `node` session. Its value, `magic`, is also
removed. Please use `sloppy` instead.

<a id="DEP0066"></a>
### DEP0066: `OutgoingMessage.prototype._headers, OutgoingMessage.prototype._headerNames`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/24167
    description: Runtime deprecation.
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/10941
    description: Documentation-only deprecation.
-->

Type: Runtime

The `http` module `OutgoingMessage.prototype._headers` and
`OutgoingMessage.prototype._headerNames` properties are deprecated. Use one of
the public methods (e.g. `OutgoingMessage.prototype.getHeader()`,
`OutgoingMessage.prototype.getHeaders()`,
`OutgoingMessage.prototype.getHeaderNames()`,
`OutgoingMessage.prototype.hasHeader()`,
`OutgoingMessage.prototype.removeHeader()`,
`OutgoingMessage.prototype.setHeader()`) for working with outgoing headers.

The `OutgoingMessage.prototype._headers` and
`OutgoingMessage.prototype._headerNames` properties were never documented as
officially supported properties.

<a id="DEP0067"></a>
### DEP0067: `OutgoingMessage.prototype._renderHeaders`
<!-- YAML
changes:
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/10941
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The `http` module `OutgoingMessage.prototype._renderHeaders()` API is
deprecated.

The `OutgoingMessage.prototype._renderHeaders` property was never documented as
an officially supported API.

<a id="DEP0068"></a>
### DEP0068: `node debug`
<!-- YAML
changes:
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/11441
    description: Runtime deprecation.
-->

Type: Runtime

`node debug` corresponds to the legacy CLI debugger which has been replaced with
a V8-inspector based CLI debugger available through `node inspect`.

<a id="DEP0069"></a>
### DEP0069: `vm.runInDebugContext(string)`
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/13295
    description: End-of-Life.
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/12815
    description: Runtime deprecation.
  - version: v8.0.0
    pr-url: https://github.com/nodejs/node/pull/12243
    description: Documentation-only deprecation.
-->

Type: End-of-Life

DebugContext has been removed in V8 and is not available in Node.js 10+.

DebugContext was an experimental API.

<a id="DEP0070"></a>
### DEP0070: `async_hooks.currentId()`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/14414
    description: End-of-Life.
  - version: v8.2.0
    pr-url: https://github.com/nodejs/node/pull/13490
    description: Runtime deprecation.
-->

Type: End-of-Life

`async_hooks.currentId()` was renamed to `async_hooks.executionAsyncId()` for
clarity.

This change was made while `async_hooks` was an experimental API.

<a id="DEP0071"></a>
### DEP0071: `async_hooks.triggerId()`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/14414
    description: End-of-Life.
  - version: v8.2.0
    pr-url: https://github.com/nodejs/node/pull/13490
    description: Runtime deprecation.
-->

Type: End-of-Life

`async_hooks.triggerId()` was renamed to `async_hooks.triggerAsyncId()` for
clarity.

This change was made while `async_hooks` was an experimental API.

<a id="DEP0072"></a>
### DEP0072: `async_hooks.AsyncResource.triggerId()`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/14414
    description: End-of-Life.
  - version: v8.2.0
    pr-url: https://github.com/nodejs/node/pull/13490
    description: Runtime deprecation.
-->

Type: End-of-Life

`async_hooks.AsyncResource.triggerId()` was renamed to
`async_hooks.AsyncResource.triggerAsyncId()` for clarity.

This change was made while `async_hooks` was an experimental API.

<a id="DEP0073"></a>
### DEP0073: Several internal properties of `net.Server`
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/17141
    description: End-of-Life.
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/14449
    description: Runtime deprecation.
-->

Type: End-of-Life

Accessing several internal, undocumented properties of `net.Server` instances
with inappropriate names is deprecated.

As the original API was undocumented and not generally useful for non-internal
code, no replacement API is provided.

<a id="DEP0074"></a>
### DEP0074: `REPLServer.bufferedCommand`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/13687
    description: Runtime deprecation.
-->

Type: Runtime

The `REPLServer.bufferedCommand` property was deprecated in favor of
[`REPLServer.clearBufferedCommand()`][].

<a id="DEP0075"></a>
### DEP0075: `REPLServer.parseREPLKeyword()`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/14223
    description: Runtime deprecation.
-->

Type: Runtime

`REPLServer.parseREPLKeyword()` was removed from userland visibility.

<a id="DEP0076"></a>
### DEP0076: `tls.parseCertString()`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/14249
    description: Runtime deprecation.
  - version: v8.6.0
    pr-url: https://github.com/nodejs/node/pull/14245
    description: Documentation-only deprecation.
-->

Type: Runtime

`tls.parseCertString()` is a trivial parsing helper that was made public by
mistake. This function can usually be replaced with:

```js
const querystring = require('querystring');
querystring.parse(str, '\n', '=');
```

This function is not completely equivalent to `querystring.parse()`. One
difference is that `querystring.parse()` does url decoding:

```sh
> querystring.parse('%E5%A5%BD=1', '\n', '=');
{ '好': '1' }
> tls.parseCertString('%E5%A5%BD=1');
{ '%E5%A5%BD': '1' }
```

<a id="DEP0077"></a>
### DEP0077: `Module._debug()`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/13948
    description: Runtime deprecation.
-->

Type: Runtime

`Module._debug()` is deprecated.

The `Module._debug()` function was never documented as an officially
supported API.

<a id="DEP0078"></a>
### DEP0078: `REPLServer.turnOffEditorMode()`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/15136
    description: Runtime deprecation.
-->

Type: Runtime

`REPLServer.turnOffEditorMode()` was removed from userland visibility.

<a id="DEP0079"></a>
### DEP0079: Custom inspection function on Objects via `.inspect()`
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/20722
    description: End-of-Life.
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/16393
    description: Runtime deprecation.
  - version: v8.7.0
    pr-url: https://github.com/nodejs/node/pull/15631
    description: Documentation-only deprecation.
-->

Type: End-of-Life

Using a property named `inspect` on an object to specify a custom inspection
function for [`util.inspect()`][] is deprecated. Use [`util.inspect.custom`][]
instead. For backward compatibility with Node.js prior to version 6.4.0, both
may be specified.

<a id="DEP0080"></a>
### DEP0080: `path._makeLong()`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/14956
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The internal `path._makeLong()` was not intended for public use. However,
userland modules have found it useful. The internal API is deprecated
and replaced with an identical, public `path.toNamespacedPath()` method.

<a id="DEP0081"></a>
### DEP0081: `fs.truncate()` using a file descriptor
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/15990
    description: Runtime deprecation.
-->

Type: Runtime

`fs.truncate()` `fs.truncateSync()` usage with a file descriptor is
deprecated. Please use `fs.ftruncate()` or `fs.ftruncateSync()` to work with
file descriptors.

<a id="DEP0082"></a>
### DEP0082: `REPLServer.prototype.memory()`
<!-- YAML
changes:
  - version: v9.0.0
    pr-url: https://github.com/nodejs/node/pull/16242
    description: Runtime deprecation.
-->

Type: Runtime

`REPLServer.prototype.memory()` is only necessary for the internal mechanics of
the `REPLServer` itself. Do not use this function.

<a id="DEP0083"></a>
### DEP0083: Disabling ECDH by setting `ecdhCurve` to `false`
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/19794
    description: End-of-Life.
  - version: v9.2.0
    pr-url: https://github.com/nodejs/node/pull/16130
    description: Runtime deprecation.
-->

Type: End-of-Life.

The `ecdhCurve` option to `tls.createSecureContext()` and `tls.TLSSocket` could
be set to `false` to disable ECDH entirely on the server only. This mode was
deprecated in preparation for migrating to OpenSSL 1.1.0 and consistency with
the client and is now unsupported. Use the `ciphers` parameter instead.

<a id="DEP0084"></a>
### DEP0084: requiring bundled internal dependencies
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/25138
    description: This functionality has been removed.
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/16392
    description: Runtime deprecation.
-->

Type: End-of-Life

Since Node.js versions 4.4.0 and 5.2.0, several modules only intended for
internal usage were mistakenly exposed to user code through `require()`. These
modules were:

* `v8/tools/codemap`
* `v8/tools/consarray`
* `v8/tools/csvparser`
* `v8/tools/logreader`
* `v8/tools/profile_view`
* `v8/tools/profile`
* `v8/tools/SourceMap`
* `v8/tools/splaytree`
* `v8/tools/tickprocessor-driver`
* `v8/tools/tickprocessor`
* `node-inspect/lib/_inspect` (from 7.6.0)
* `node-inspect/lib/internal/inspect_client` (from 7.6.0)
* `node-inspect/lib/internal/inspect_repl` (from 7.6.0)

The `v8/*` modules do not have any exports, and if not imported in a specific
order would in fact throw errors. As such there are virtually no legitimate use
cases for importing them through `require()`.

On the other hand, `node-inspect` may be installed locally through a package
manager, as it is published on the npm registry under the same name. No source
code modification is necessary if that is done.

<a id="DEP0085"></a>
### DEP0085: AsyncHooks Sensitive API
<!-- YAML
changes:
  - version: 10.0.0
    pr-url: https://github.com/nodejs/node/pull/17147
    description: End-of-Life.
  - version:
    - v8.10.0
    - v9.4.0
    pr-url: https://github.com/nodejs/node/pull/16972
    description: Runtime deprecation.
-->

Type: End-of-Life

The AsyncHooks Sensitive API was never documented and had various minor issues.
Use the `AsyncResource` API instead. See
<https://github.com/nodejs/node/issues/15572>.

<a id="DEP0086"></a>
### DEP0086: Remove `runInAsyncIdScope`
<!-- YAML
changes:
  - version: 10.0.0
    pr-url: https://github.com/nodejs/node/pull/17147
    description: End-of-Life.
  - version:
    - v8.10.0
    - v9.4.0
    pr-url: https://github.com/nodejs/node/pull/16972
    description: Runtime deprecation.
-->

Type: End-of-Life

`runInAsyncIdScope` doesn't emit the `'before'` or `'after'` event and can thus
cause a lot of issues. See <https://github.com/nodejs/node/issues/14328>.

<a id="DEP0089"></a>
### DEP0089: `require('assert')`
<!-- YAML
changes:
  - version: v12.8.0
    pr-url: https://github.com/nodejs/node/pull/28892
    description: Deprecation revoked.
  - version:
      - v9.9.0
      - v10.0.0
    pr-url: https://github.com/nodejs/node/pull/17002
    description: Documentation-only deprecation.
-->

Type: Deprecation revoked

Importing assert directly was not recommended as the exposed functions use
loose equality checks. The deprecation was revoked because use of the `assert`
module is not discouraged, and the deprecation caused end user confusion.

<a id="DEP0090"></a>
### DEP0090: Invalid GCM authentication tag lengths
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/17825
    description: End-of-Life.
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18017
    description: Runtime deprecation.
-->

Type: End-of-Life

Node.js used to support all GCM authentication tag lengths which are accepted by
OpenSSL when calling [`decipher.setAuthTag()`][]. Beginning with Node.js
v11.0.0, only authentication tag lengths of 128, 120, 112, 104, 96, 64, and 32
bits are allowed. Authentication tags of other lengths are invalid per
[NIST SP 800-38D][].

<a id="DEP0091"></a>
### DEP0091: `crypto.DEFAULT_ENCODING`
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18333
    description: Runtime deprecation.
-->

Type: Runtime

The [`crypto.DEFAULT_ENCODING`][] property is deprecated.

<a id="DEP0092"></a>
### DEP0092: Top-level `this` bound to `module.exports`
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/16878
    description: Documentation-only deprecation.
-->

Type: Documentation-only

Assigning properties to the top-level `this` as an alternative
to `module.exports` is deprecated. Developers should use `exports`
or `module.exports` instead.

<a id="DEP0093"></a>
### DEP0093: `crypto.fips` is deprecated and replaced.
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18335
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [`crypto.fips`][] property is deprecated. Please use `crypto.setFips()`
and `crypto.getFips()` instead.

<a id="DEP0094"></a>
### DEP0094: Using `assert.fail()` with more than one argument.
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18418
    description: Runtime deprecation.
-->

Type: Runtime

Using `assert.fail()` with more than one argument is deprecated. Use
`assert.fail()` with only one argument or use a different `assert` module
method.

<a id="DEP0095"></a>
### DEP0095: `timers.enroll()`
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18066
    description: Runtime deprecation.
-->

Type: Runtime

`timers.enroll()` is deprecated. Please use the publicly documented
[`setTimeout()`][] or [`setInterval()`][] instead.

<a id="DEP0096"></a>
### DEP0096: `timers.unenroll()`
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18066
    description: Runtime deprecation.
-->

Type: Runtime

`timers.unenroll()` is deprecated. Please use the publicly documented
[`clearTimeout()`][] or [`clearInterval()`][] instead.

<a id="DEP0097"></a>
### DEP0097: `MakeCallback` with `domain` property
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/17417
    description: Runtime deprecation.
-->

Type: Runtime

Users of `MakeCallback` that add the `domain` property to carry context,
should start using the `async_context` variant of `MakeCallback` or
`CallbackScope`, or the high-level `AsyncResource` class.

<a id="DEP0098"></a>
### DEP0098: AsyncHooks Embedder `AsyncResource.emitBefore` and `AsyncResource.emitAfter` APIs
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/26530
    description: End-of-Life
  - version:
    - v8.12.0
    - v9.6.0
    - v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18632
    description: Runtime deprecation.
-->

Type: End-of-Life

The embedded API provided by AsyncHooks exposes `.emitBefore()` and
`.emitAfter()` methods which are very easy to use incorrectly which can lead
to unrecoverable errors.

Use [`asyncResource.runInAsyncScope()`][] API instead which provides a much
safer, and more convenient, alternative. See
<https://github.com/nodejs/node/pull/18513>.

<a id="DEP0099"></a>
### DEP0099: async context-unaware `node::MakeCallback` C++ APIs
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18632
    description: Compile-time deprecation.
-->

Type: Compile-time

Certain versions of `node::MakeCallback` APIs available to native modules are
deprecated. Please use the versions of the API that accept an `async_context`
parameter.

<a id="DEP0100"></a>
### DEP0100: `process.assert()`
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18666
    description: Runtime deprecation.
  - version: v0.3.7
    description: Documentation-only deprecation.
-->

Type: Runtime

`process.assert()` is deprecated. Please use the [`assert`][] module instead.

This was never a documented feature.

<a id="DEP0101"></a>
### DEP0101: `--with-lttng`
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18982
    description: End-of-Life.
-->

Type: End-of-Life

The `--with-lttng` compile-time option has been removed.

<a id="DEP0102"></a>
### DEP0102: Using `noAssert` in `Buffer#(read|write)` operations.
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18395
    description: End-of-Life.
-->

Type: End-of-Life

Using the `noAssert` argument has no functionality anymore. All input is going
to be verified, no matter if it is set to true or not. Skipping the verification
could lead to hard to find errors and crashes.

<a id="DEP0103"></a>
### DEP0103: `process.binding('util').is[...]` typechecks
<!-- YAML
changes:
  - version: v10.9.0
    pr-url: https://github.com/nodejs/node/pull/22004
    description: Superseded by [DEP0111](#DEP0111).
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18415
    description: Documentation-only deprecation.
-->

Type: Documentation-only (supports [`--pending-deprecation`][])

Using `process.binding()` in general should be avoided. The type checking
methods in particular can be replaced by using [`util.types`][].

This deprecation has been superseded by the deprecation of the
`process.binding()` API ([DEP0111](#DEP0111)).

<a id="DEP0104"></a>
### DEP0104: `process.env` string coercion
<!-- YAML
changes:
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/18990
    description: Documentation-only deprecation.
-->

Type: Documentation-only (supports [`--pending-deprecation`][])

When assigning a non-string property to [`process.env`][], the assigned value is
implicitly converted to a string. This behavior is deprecated if the assigned
value is not a string, boolean, or number. In the future, such assignment may
result in a thrown error. Please convert the property to a string before
assigning it to `process.env`.

<a id="DEP0105"></a>
### DEP0105: `decipher.finaltol`
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/19941
    description: End-of-Life.
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/19353
    description: Runtime deprecation.
-->

Type: End-of-Life

`decipher.finaltol()` has never been documented and was an alias for
[`decipher.final()`][]. This API has been removed, and it is recommended to use
[`decipher.final()`][] instead.

<a id="DEP0106"></a>
### DEP0106: `crypto.createCipher` and `crypto.createDecipher`
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/22089
    description: Runtime deprecation.
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/19343
    description: Documentation-only deprecation.
-->

Type: Runtime

Using [`crypto.createCipher()`][] and [`crypto.createDecipher()`][] should be
avoided as they use a weak key derivation function (MD5 with no salt) and static
initialization vectors. It is recommended to derive a key using
[`crypto.pbkdf2()`][] or [`crypto.scrypt()`][] and to use
[`crypto.createCipheriv()`][] and [`crypto.createDecipheriv()`][] to obtain the
[`Cipher`][] and [`Decipher`][] objects respectively.

<a id="DEP0107"></a>
### DEP0107: `tls.convertNPNProtocols()`
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/20736
    description: End-of-Life.
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/19403
    description: Runtime deprecation.
-->

Type: End-of-Life

This was an undocumented helper function not intended for use outside Node.js
core and obsoleted by the removal of NPN (Next Protocol Negotiation) support.

<a id="DEP0108"></a>
### DEP0108: `zlib.bytesRead`
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/23308
    description: Runtime deprecation.
  - version: v10.0.0
    pr-url: https://github.com/nodejs/node/pull/19414
    description: Documentation-only deprecation.
-->

Type: Runtime

Deprecated alias for [`zlib.bytesWritten`][]. This original name was chosen
because it also made sense to interpret the value as the number of bytes
read by the engine, but is inconsistent with other streams in Node.js that
expose values under these names.

<a id="DEP0109"></a>
### DEP0109: `http`, `https`, and `tls` support for invalid URLs
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/20270
    description: Runtime deprecation.
-->

Type: Runtime

Some previously supported (but strictly invalid) URLs were accepted through the
[`http.request()`][], [`http.get()`][], [`https.request()`][],
[`https.get()`][], and [`tls.checkServerIdentity()`][] APIs because those were
accepted by the legacy `url.parse()` API. The mentioned APIs now use the WHATWG
URL parser that requires strictly valid URLs. Passing an invalid URL is
deprecated and support will be removed in the future.

<a id="DEP0110"></a>
### DEP0110: `vm.Script` cached data
<!-- YAML
changes:
  - version: v10.6.0
    pr-url: https://github.com/nodejs/node/pull/20300
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The `produceCachedData` option is deprecated. Use
[`script.createCachedData()`][] instead.

<a id="DEP0111"></a>
### DEP0111: `process.binding()`
<!-- YAML
changes:
  - version: v10.9.0
    pr-url: https://github.com/nodejs/node/pull/22004
    description: Documentation-only deprecation.
  - version: v11.12.0
    pr-url: https://github.com/nodejs/node/pull/26500
    description: Added support for `--pending-deprecation`.
-->

Type: Documentation-only (supports [`--pending-deprecation`][])

`process.binding()` is for use by Node.js internal code only.

<a id="DEP0112"></a>
### DEP0112: `dgram` private APIs
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/22011
    description: Runtime deprecation.
-->

Type: Runtime

The `dgram` module previously contained several APIs that were never meant to
accessed outside of Node.js core: `Socket.prototype._handle`,
`Socket.prototype._receiving`, `Socket.prototype._bindState`,
`Socket.prototype._queue`, `Socket.prototype._reuseAddr`,
`Socket.prototype._healthCheck()`, `Socket.prototype._stopReceiving()`, and
`dgram._createSocketHandle()`.

<a id="DEP0113"></a>
### DEP0113: `Cipher.setAuthTag()`, `Decipher.getAuthTag()`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/26249
    description: End-of-Life.
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/22126
    description: Runtime deprecation.
-->

Type: End-of-Life

`Cipher.setAuthTag()` and `Decipher.getAuthTag()` are no longer available. They
were never documented and would throw when called.

<a id="DEP0114"></a>
### DEP0114: `crypto._toBuf()`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/25338
    description: End-of-Life.
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/22501
    description: Runtime deprecation.
-->

Type: End-of-Life

The `crypto._toBuf()` function was not designed to be used by modules outside
of Node.js core and was removed.

<a id="DEP0115"></a>
### DEP0115: `crypto.prng()`, `crypto.pseudoRandomBytes()`, `crypto.rng()`
<!-- YAML
changes:
  - version: v11.0.0
    pr-url:
      - https://github.com/nodejs/node/pull/22519
      - https://github.com/nodejs/node/pull/23017
    description: Added documentation-only deprecation
                 with `--pending-deprecation` support.
-->

Type: Documentation-only (supports [`--pending-deprecation`][])

In recent versions of Node.js, there is no difference between
[`crypto.randomBytes()`][] and `crypto.pseudoRandomBytes()`. The latter is
deprecated along with the undocumented aliases `crypto.prng()` and
`crypto.rng()` in favor of [`crypto.randomBytes()`][] and may be removed in a
future release.

<a id="DEP0116"></a>
### DEP0116: Legacy URL API
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/22715
    description: Documentation-only deprecation.
-->

Type: Documentation-only

The [Legacy URL API][] is deprecated. This includes [`url.format()`][],
[`url.parse()`][], [`url.resolve()`][], and the [legacy `urlObject`][]. Please
use the [WHATWG URL API][] instead.

<a id="DEP0117"></a>
### DEP0117: Native crypto handles
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/27011
    description: End-of-Life.
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/22747
    description: Runtime deprecation.
-->

Type: End-of-Life

Previous versions of Node.js exposed handles to internal native objects through
the `_handle` property of the `Cipher`, `Decipher`, `DiffieHellman`,
`DiffieHellmanGroup`, `ECDH`, `Hash`, `Hmac`, `Sign`, and `Verify` classes.
The `_handle` property has been removed because improper use of the native
object can lead to crashing the application.

<a id="DEP0118"></a>
### DEP0118: `dns.lookup()` support for a falsy host name
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/23173
    description: Runtime deprecation.
-->

Type: Runtime

Previous versions of Node.js supported `dns.lookup()` with a falsy host name
like `dns.lookup(false)` due to backward compatibility.
This behavior is undocumented and is thought to be unused in real world apps.
It will become an error in future versions of Node.js.

<a id="DEP0119"></a>
### DEP0119: `process.binding('uv').errname()` private API
<!-- YAML
changes:
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/23597
    description: Documentation-only deprecation.
-->

Type: Documentation-only (supports [`--pending-deprecation`][])

`process.binding('uv').errname()` is deprecated. Please use
[`util.getSystemErrorName()`][] instead.

<a id="DEP0120"></a>
### DEP0120: Windows Performance Counter Support
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/24862
    description: End-of-Life.
  - version: v11.0.0
    pr-url: https://github.com/nodejs/node/pull/22485
    description: Runtime deprecation.
-->

Type: End-of-Life

Windows Performance Counter support has been removed from Node.js. The
undocumented `COUNTER_NET_SERVER_CONNECTION()`,
`COUNTER_NET_SERVER_CONNECTION_CLOSE()`, `COUNTER_HTTP_SERVER_REQUEST()`,
`COUNTER_HTTP_SERVER_RESPONSE()`, `COUNTER_HTTP_CLIENT_REQUEST()`, and
`COUNTER_HTTP_CLIENT_RESPONSE()` functions have been deprecated.

<a id="DEP0121"></a>
### DEP0121: `net._setSimultaneousAccepts()`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/23760
    description: Runtime deprecation.
-->

Type: Runtime

The undocumented `net._setSimultaneousAccepts()` function was originally
intended for debugging and performance tuning when using the `child_process`
and `cluster` modules on Windows. The function is not generally useful and
is being removed. See discussion here:
<https://github.com/nodejs/node/issues/18391>

<a id="DEP0122"></a>
### DEP0122: `tls` `Server.prototype.setOptions()`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/23820
    description: Runtime deprecation.
-->

Type: Runtime

Please use `Server.prototype.setSecureContext()` instead.

<a id="DEP0123"></a>
### DEP0123: setting the TLS ServerName to an IP address
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/23329
    description: Runtime deprecation.
-->

Type: Runtime

Setting the TLS ServerName to an IP address is not permitted by
[RFC 6066][]. This will be ignored in a future version.

<a id="DEP0124"></a>
### DEP0124: using `REPLServer.rli`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/26260
    description: Runtime deprecation.
-->

Type: Runtime

This property is a reference to the instance itself.

<a id="DEP0125"></a>
### DEP0125: `require('_stream_wrap')`
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/26245
    description: Runtime deprecation.
-->

Type: Runtime

The `_stream_wrap` module is deprecated.

<a id="DEP0126"></a>
### DEP0126: `timers.active()`
<!-- YAML
changes:
  - version: v11.14.0
    pr-url: https://github.com/nodejs/node/pull/26760
    description: Runtime deprecation.
-->

Type: Runtime

The previously undocumented `timers.active()` is deprecated.
Please use the publicly documented [`timeout.refresh()`][] instead.
If re-referencing the timeout is necessary, [`timeout.ref()`][] can be used
with no performance impact since Node.js 10.

<a id="DEP0127"></a>
### DEP0127: `timers._unrefActive()`
<!-- YAML
changes:
  - version: v11.14.0
    pr-url: https://github.com/nodejs/node/pull/26760
    description: Runtime deprecation.
-->

Type: Runtime

The previously undocumented and "private" `timers._unrefActive()` is deprecated.
Please use the publicly documented [`timeout.refresh()`][] instead.
If unreferencing the timeout is necessary, [`timeout.unref()`][] can be used
with no performance impact since Node.js 10.

<a id="DEP0128"></a>
### DEP0128: modules with an invalid `main` entry and an `index.js` file
<!-- YAML
changes:
  - version: v12.0.0
    pr-url: https://github.com/nodejs/node/pull/26823
    description: Documentation-only.
-->

Type: Documentation-only (supports [`--pending-deprecation`][])

Modules that have an invalid `main` entry (e.g., `./does-not-exist.js`) and
also have an `index.js` file in the top level directory will resolve the
`index.js` file. That is deprecated and is going to throw an error in future
Node.js versions.

<a id="DEP0129"></a>
### DEP0129: `ChildProcess._channel`
<!-- YAML
changes:
  - version: v13.0.0
    pr-url: https://github.com/nodejs/node/pull/27949
    description: Runtime deprecation.
  - version: v11.14.0
    pr-url: https://github.com/nodejs/node/pull/26982
    description: Documentation-only.
-->

Type: Runtime

The `_channel` property of child process objects returned by `spawn()` and
similar functions is not intended for public use. Use `ChildProcess.channel`
instead.

<a id="DEP0130"></a>
### DEP0130: `Module.createRequireFromPath()`
<!-- YAML
changes:
  - version: v13.0.0
    pr-url: https://github.com/nodejs/node/pull/27951
    description: Runtime deprecation.
  - version: v12.2.0
    pr-url: https://github.com/nodejs/node/pull/27405
    description: Documentation-only.
-->

Type: Runtime

Module.createRequireFromPath() is deprecated. Please use
[`module.createRequire()`][] instead.

<a id="DEP0131"></a>
### DEP0131: Legacy HTTP parser
<!-- YAML
changes:
  - version: v13.0.0
    pr-url: https://github.com/nodejs/node/pull/29589
    description: This feature has been removed.
  - version: v12.3.0
    pr-url: https://github.com/nodejs/node/pull/27498
    description: Documentation-only.
-->

Type: End-of-Life

The legacy HTTP parser, used by default in versions of Node.js prior to 12.0.0,
is deprecated and has been removed in v13.0.0. Prior to v13.0.0, the
`--http-parser=legacy` command-line flag could be used to revert to using the
legacy parser.

<a id="DEP0132"></a>
### DEP0132: `worker.terminate()` with callback
<!-- YAML
changes:
  - version: v12.5.0
    pr-url: https://github.com/nodejs/node/pull/28021
    description: Runtime deprecation.
-->

Type: Runtime

Passing a callback to [`worker.terminate()`][] is deprecated. Use the returned
`Promise` instead, or a listener to the worker’s `'exit'` event.

<a id="DEP0133"></a>
### DEP0133: `http` `connection`
<!-- YAML
changes:
  - version: v12.12.0
    pr-url: https://github.com/nodejs/node/pull/29015
    description: Documentation-only deprecation.
-->

Type: Documentation-only

Prefer [`response.socket`][] over [`response.connection`][] and
[`request.socket`][] over [`request.connection`][].

<a id="DEP0134"></a>
### DEP0134: `process._tickCallback`
<!-- YAML
changes:
  - version: v12.12.0
    pr-url: https://github.com/nodejs/node/pull/29781
    description: Documentation-only deprecation.
-->
Type: Documentation-only (supports [`--pending-deprecation`][])

The `process._tickCallback` property was never documented as
an officially supported API.

<a id="DEP0135"></a>
### DEP0135: `WriteStream.open()` and `ReadStream.open()` are internal
<!-- YAML
changes:
  - version: v13.0.0
    pr-url: https://github.com/nodejs/node/pull/29061
-->

Type: Runtime

[`WriteStream.open()`][] and [`ReadStream.open()`][] are undocumented internal
APIs that do not make sense to use in userland. File streams should always be
opened through their corresponding factory methods [`fs.createWriteStream()`][]
and [`fs.createReadStream()`][]) or by passing a file descriptor in options.

<a id="DEP0136"></a>
### DEP0136: `http` `finished`
<!-- YAML
changes:
  - version:
     - v13.4.0
     - v12.16.0
    pr-url: https://github.com/nodejs/node/pull/28679
    description: Documentation-only deprecation.
-->

Type: Documentation-only

[`response.finished`][] indicates whether [`response.end()`][] has been
called, not whether `'finish'` has been emitted and the underlying data
is flushed.

Use [`response.writableFinished`][] or [`response.writableEnded`][]
accordingly instead to avoid the ambigiuty.

To maintain existing behaviour `response.finished` should be replaced with
`response.writableEnded`.

<a id="DEP0137"></a>
### DEP0137: Closing fs.FileHandle on garbage collection
<!-- YAML
changes:
  - version: v14.0.0
    pr-url: https://github.com/nodejs/node/pull/28396
    description: Runtime deprecation.
-->

Type: Runtime

Allowing a [`fs.FileHandle`][] object to be closed on garbage collection is
deprecated. In the future, doing so may result in a thrown error that will
terminate the process.

Please ensure that all `fs.FileHandle` objects are explicitly closed using
`FileHandle.prototype.close()` when the `fs.FileHandle` is no longer needed:

```js
const fsPromises = require('fs').promises;
async function openAndClose() {
  let filehandle;
  try {
    filehandle = await fsPromises.open('thefile.txt', 'r');
  } finally {
    if (filehandle !== undefined)
      await filehandle.close();
  }
}
```

<a id="DEP0138"></a>
### DEP0138: `process.mainModule`
<!-- YAML
changes:
  - version: v14.0.0
    pr-url: https://github.com/nodejs/node/pull/32232
    description: Documentation-only deprecation.
-->

Type: Documentation-only

[`process.mainModule`][] is a CommonJS-only feature while `process` global
object is shared with non-CommonJS environment. Its use within ECMAScript
modules is unsupported.

It is deprecated in favor of [`require.main`][], because it serves the same
purpose and is only available on CommonJS environment.

<a id="DEP0139"></a>
### DEP0139: `process.umask()` with no arguments
<!-- YAML
changes:
  - version: v14.0.0
    pr-url: https://github.com/nodejs/node/pull/32499
    description: Documentation-only deprecation.
-->

Type: Documentation-only

Calling `process.umask()` with no argument causes the process-wide umask to be
written twice. This introduces a race condition between threads, and is a
potential security vulnerability. There is no safe, cross-platform alternative
API.

<a id="DEP0140"></a>
### DEP0140: Use `request.destroy()` instead of `request.abort()`
<!-- YAML
changes:
  - version: v14.1.0
    pr-url: https://github.com/nodejs/node/pull/32807
    description: Documentation-only deprecation.
-->

Type: Documentation-only

Use [`request.destroy()`][] instead of [`request.abort()`][].

<a id="DEP0141"></a>
### DEP0141: `repl.inputStream` and `repl.outputStream`
<!-- YAML
changes:
  - version: v14.3.0
    pr-url: https://github.com/nodejs/node/pull/33294
    description: Documentation-only (supports [`--pending-deprecation`][]).
-->

Type: Documentation-only (supports [`--pending-deprecation`][])

The `repl` module exported the input and output stream twice. Use `.input`
instead of `.inputStream` and `.output` instead of `.outputStream`.

<a id="DEP0142"></a>
### DEP0142: `repl._builtinLibs`
<!-- YAML
changes:
  - version: v14.3.0
    pr-url: https://github.com/nodejs/node/pull/33294
    description: Documentation-only (supports [`--pending-deprecation`][]).
-->

Type: Documentation-only

The `repl` module exports a `_builtinLibs` property that contains an array with
native modules. It was incomplete so far and instead it's better to rely upon
`require('module').builtinModules`.

[`--pending-deprecation`]: cli.html#cli_pending_deprecation
[`--throw-deprecation`]: cli.html#cli_throw_deprecation
[`Buffer.allocUnsafeSlow(size)`]: buffer.html#buffer_class_method_buffer_allocunsafeslow_size
[`Buffer.from(array)`]: buffer.html#buffer_class_method_buffer_from_array
[`Buffer.from(buffer)`]: buffer.html#buffer_class_method_buffer_from_buffer
[`Buffer.isBuffer()`]: buffer.html#buffer_class_method_buffer_isbuffer_obj
[`Cipher`]: crypto.html#crypto_class_cipher
[`Decipher`]: crypto.html#crypto_class_decipher
[`EventEmitter.listenerCount(emitter, eventName)`]: events.html#events_eventemitter_listenercount_emitter_eventname
[`REPLServer.clearBufferedCommand()`]: repl.html#repl_replserver_clearbufferedcommand
[`ReadStream.open()`]: fs.html#fs_class_fs_readstream
[`Server.connections`]: net.html#net_server_connections
[`Server.getConnections()`]: net.html#net_server_getconnections_callback
[`Server.listen({fd: <number>})`]: net.html#net_server_listen_handle_backlog_callback
[`SlowBuffer`]: buffer.html#buffer_class_slowbuffer
[`WriteStream.open()`]: fs.html#fs_class_fs_writestream
[`assert`]: assert.html
[`asyncResource.runInAsyncScope()`]: async_hooks.html#async_hooks_asyncresource_runinasyncscope_fn_thisarg_args
[`child_process`]: child_process.html
[`clearInterval()`]: timers.html#timers_clearinterval_timeout
[`clearTimeout()`]: timers.html#timers_cleartimeout_timeout
[`console.error()`]: console.html#console_console_error_data_args
[`console.log()`]: console.html#console_console_log_data_args
[`crypto.DEFAULT_ENCODING`]: crypto.html#crypto_crypto_default_encoding
[`crypto.createCipher()`]: crypto.html#crypto_crypto_createcipher_algorithm_password_options
[`crypto.createCipheriv()`]: crypto.html#crypto_crypto_createcipheriv_algorithm_key_iv_options
[`crypto.createDecipher()`]: crypto.html#crypto_crypto_createdecipher_algorithm_password_options
[`crypto.createDecipheriv()`]: crypto.html#crypto_crypto_createdecipheriv_algorithm_key_iv_options
[`crypto.fips`]: crypto.html#crypto_crypto_fips
[`crypto.pbkdf2()`]: crypto.html#crypto_crypto_pbkdf2_password_salt_iterations_keylen_digest_callback
[`crypto.randomBytes()`]: crypto.html#crypto_crypto_randombytes_size_callback
[`crypto.scrypt()`]: crypto.html#crypto_crypto_scrypt_password_salt_keylen_options_callback
[`decipher.final()`]: crypto.html#crypto_decipher_final_outputencoding
[`decipher.setAuthTag()`]: crypto.html#crypto_decipher_setauthtag_buffer
[`domain`]: domain.html
[`ecdh.setPublicKey()`]: crypto.html#crypto_ecdh_setpublickey_publickey_encoding
[`emitter.listenerCount(eventName)`]: events.html#events_emitter_listenercount_eventname
[`fs.FileHandle`]: fs.html#fs_class_filehandle
[`fs.access()`]: fs.html#fs_fs_access_path_mode_callback
[`fs.createReadStream()`]: fs.html#fs_fs_createreadstream_path_options
[`fs.createWriteStream()`]: fs.html#fs_fs_createwritestream_path_options
[`fs.exists(path, callback)`]: fs.html#fs_fs_exists_path_callback
[`fs.lchmod(path, mode, callback)`]: fs.html#fs_fs_lchmod_path_mode_callback
[`fs.lchmodSync(path, mode)`]: fs.html#fs_fs_lchmodsync_path_mode
[`fs.lchown(path, uid, gid, callback)`]: fs.html#fs_fs_lchown_path_uid_gid_callback
[`fs.lchownSync(path, uid, gid)`]: fs.html#fs_fs_lchownsync_path_uid_gid
[`fs.read()`]: fs.html#fs_fs_read_fd_buffer_offset_length_position_callback
[`fs.readSync()`]: fs.html#fs_fs_readsync_fd_buffer_offset_length_position
[`fs.stat()`]: fs.html#fs_fs_stat_path_options_callback
[`http.get()`]: http.html#http_http_get_options_callback
[`http.request()`]: http.html#http_http_request_options_callback
[`https.get()`]: https.html#https_https_get_options_callback
[`https.request()`]: https.html#https_https_request_options_callback
[`module.createRequire()`]: modules.html#modules_module_createrequire_filename
[`os.networkInterfaces()`]: os.html#os_os_networkinterfaces
[`os.tmpdir()`]: os.html#os_os_tmpdir
[`process.env`]: process.html#process_process_env
[`process.mainModule`]: process.html#process_process_mainmodule
[`punycode`]: punycode.html
[`require.extensions`]: modules.html#modules_require_extensions
[`require.main`]: modules.html#modules_accessing_the_main_module
[`request.abort()`]: http.html#http_request_abort
[`request.socket`]: http.html#http_request_socket
[`request.connection`]: http.html#http_request_connection
[`request.destroy()`]: http.html#http_request_destroy_error
[`response.socket`]: http.html#http_response_socket
[`response.connection`]: http.html#http_response_connection
[`response.end()`]: http.html#http_response_end_data_encoding_callback
[`response.finished`]: #http_response_finished
[`response.writableFinished`]: #http_response_writablefinished
[`response.writableEnded`]: #http_response_writableended
[`script.createCachedData()`]: vm.html#vm_script_createcacheddata
[`setInterval()`]: timers.html#timers_setinterval_callback_delay_args
[`setTimeout()`]: timers.html#timers_settimeout_callback_delay_args
[`timeout.ref()`]: timers.html#timers_timeout_ref
[`timeout.refresh()`]: timers.html#timers_timeout_refresh
[`timeout.unref()`]: timers.html#timers_timeout_unref
[`tls.CryptoStream`]: tls.html#tls_class_cryptostream
[`tls.SecureContext`]: tls.html#tls_tls_createsecurecontext_options
[`tls.SecurePair`]: tls.html#tls_class_securepair
[`tls.TLSSocket`]: tls.html#tls_class_tls_tlssocket
[`tls.checkServerIdentity()`]: tls.html#tls_tls_checkserveridentity_hostname_cert
[`tls.createSecureContext()`]: tls.html#tls_tls_createsecurecontext_options
[`url.format()`]: url.html#url_url_format_urlobject
[`url.parse()`]: url.html#url_url_parse_urlstring_parsequerystring_slashesdenotehost
[`url.resolve()`]: url.html#url_url_resolve_from_to
[`util._extend()`]: util.html#util_util_extend_target_source
[`util.getSystemErrorName()`]: util.html#util_util_getsystemerrorname_err
[`util.inspect()`]: util.html#util_util_inspect_object_options
[`util.inspect.custom`]: util.html#util_util_inspect_custom
[`util.isArray()`]: util.html#util_util_isarray_object
[`util.isBoolean()`]: util.html#util_util_isboolean_object
[`util.isBuffer()`]: util.html#util_util_isbuffer_object
[`util.isDate()`]: util.html#util_util_isdate_object
[`util.isError()`]: util.html#util_util_iserror_object
[`util.isFunction()`]: util.html#util_util_isfunction_object
[`util.isNull()`]: util.html#util_util_isnull_object
[`util.isNullOrUndefined()`]: util.html#util_util_isnullorundefined_object
[`util.isNumber()`]: util.html#util_util_isnumber_object
[`util.isObject()`]: util.html#util_util_isobject_object
[`util.isPrimitive()`]: util.html#util_util_isprimitive_object
[`util.isRegExp()`]: util.html#util_util_isregexp_object
[`util.isString()`]: util.html#util_util_isstring_object
[`util.isSymbol()`]: util.html#util_util_issymbol_object
[`util.isUndefined()`]: util.html#util_util_isundefined_object
[`util.log()`]: util.html#util_util_log_string
[`util.types`]: util.html#util_util_types
[`util`]: util.html
[`worker.exitedAfterDisconnect`]: cluster.html#cluster_worker_exitedafterdisconnect
[`worker.terminate()`]: worker_threads.html#worker_threads_worker_terminate
[`zlib.bytesWritten`]: zlib.html#zlib_zlib_byteswritten
[Legacy URL API]: url.html#url_legacy_url_api
[NIST SP 800-38D]: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf
[RFC 6066]: https://tools.ietf.org/html/rfc6066#section-3
[WHATWG URL API]: url.html#url_the_whatwg_url_api
[alloc]: buffer.html#buffer_class_method_buffer_alloc_size_fill_encoding
[alloc_unsafe_size]: buffer.html#buffer_class_method_buffer_allocunsafe_size
[from_arraybuffer]: buffer.html#buffer_class_method_buffer_from_arraybuffer_byteoffset_length
[from_string_encoding]: buffer.html#buffer_class_method_buffer_from_string_encoding
[legacy `urlObject`]: url.html#url_legacy_urlobject