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
|
'use strict';
/* global WebAssembly */
const {
Boolean,
JSONParse,
ObjectPrototypeHasOwnProperty,
ObjectKeys,
PromisePrototypeCatch,
PromiseReject,
SafeMap,
SafeSet,
StringPrototypeReplace,
} = primordials;
let _TYPES = null;
function lazyTypes() {
if (_TYPES !== null) return _TYPES;
return _TYPES = require('internal/util/types');
}
const { readFileSync } = require('fs');
const { extname } = require('path');
const {
stripBOM,
loadNativeModule
} = require('internal/modules/cjs/helpers');
const {
Module: CJSModule,
cjsParseCache
} = require('internal/modules/cjs/loader');
const internalURLModule = require('internal/url');
const { defaultGetSource } = require(
'internal/modules/esm/get_source');
const { defaultTransformSource } = require(
'internal/modules/esm/transform_source');
const createDynamicModule = require(
'internal/modules/esm/create_dynamic_module');
const { fileURLToPath, URL } = require('url');
let debug = require('internal/util/debuglog').debuglog('esm', (fn) => {
debug = fn;
});
const { emitExperimentalWarning } = require('internal/util');
const {
ERR_UNKNOWN_BUILTIN_MODULE,
ERR_INVALID_RETURN_PROPERTY_VALUE
} = require('internal/errors').codes;
const { maybeCacheSourceMap } = require('internal/source_map/source_map_cache');
const moduleWrap = internalBinding('module_wrap');
const { ModuleWrap } = moduleWrap;
const { getOptionValue } = require('internal/options');
const experimentalImportMetaResolve =
getOptionValue('--experimental-import-meta-resolve');
const asyncESM = require('internal/process/esm_loader');
const cjsParse = require('internal/deps/cjs-module-lexer/lexer');
const translators = new SafeMap();
exports.translators = translators;
let DECODER = null;
function assertBufferSource(body, allowString, hookName) {
if (allowString && typeof body === 'string') {
return;
}
const { isArrayBufferView, isAnyArrayBuffer } = lazyTypes();
if (isArrayBufferView(body) || isAnyArrayBuffer(body)) {
return;
}
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
`${allowString ? 'string, ' : ''}array buffer, or typed array`,
hookName,
'source',
body
);
}
function stringify(body) {
if (typeof body === 'string') return body;
assertBufferSource(body, false, 'transformSource');
DECODER = DECODER === null ? new TextDecoder() : DECODER;
return DECODER.decode(body);
}
function errPath(url) {
const parsed = new URL(url);
if (parsed.protocol === 'file:') {
return fileURLToPath(parsed);
}
return url;
}
async function importModuleDynamically(specifier, { url }) {
return asyncESM.ESMLoader.import(specifier, url);
}
function createImportMetaResolve(defaultParentUrl) {
return async function resolve(specifier, parentUrl = defaultParentUrl) {
return PromisePrototypeCatch(
asyncESM.ESMLoader.resolve(specifier, parentUrl),
(error) => (
error.code === 'ERR_UNSUPPORTED_DIR_IMPORT' ?
error.url : PromiseReject(error))
);
};
}
function initializeImportMeta(meta, { url }) {
// Alphabetical
if (experimentalImportMetaResolve)
meta.resolve = createImportMetaResolve(url);
meta.url = url;
}
// Strategy for loading a standard JavaScript module.
translators.set('module', async function moduleStrategy(url) {
let { source } = await this._getSource(
url, { format: 'module' }, defaultGetSource);
assertBufferSource(source, true, 'getSource');
({ source } = await this._transformSource(
source, { url, format: 'module' }, defaultTransformSource));
source = stringify(source);
maybeCacheSourceMap(url, source);
debug(`Translating StandardModule ${url}`);
const module = new ModuleWrap(url, undefined, source, 0, 0);
moduleWrap.callbackMap.set(module, {
initializeImportMeta,
importModuleDynamically,
});
return module;
});
// Strategy for loading a node-style CommonJS module
const isWindows = process.platform === 'win32';
const winSepRegEx = /\//g;
translators.set('commonjs', async function commonjsStrategy(url, isMain) {
debug(`Translating CJSModule ${url}`);
let filename = internalURLModule.fileURLToPath(new URL(url));
if (isWindows)
filename = StringPrototypeReplace(filename, winSepRegEx, '\\');
const { module, exportNames } = cjsPreparseModuleExports(filename);
const namesWithDefault = exportNames.has('default') ?
[...exportNames] : ['default', ...exportNames];
return new ModuleWrap(url, undefined, namesWithDefault, function() {
debug(`Loading CJSModule ${url}`);
let exports;
if (asyncESM.ESMLoader.cjsCache.has(module)) {
exports = asyncESM.ESMLoader.cjsCache.get(module);
asyncESM.ESMLoader.cjsCache.delete(module);
} else {
exports = CJSModule._load(filename, undefined, isMain);
}
for (const exportName of exportNames) {
if (!ObjectPrototypeHasOwnProperty(exports, exportName) ||
exportName === 'default')
continue;
// We might trigger a getter -> dont fail.
let value;
try {
value = exports[exportName];
} catch {}
this.setExport(exportName, value);
}
this.setExport('default', exports);
});
});
function cjsPreparseModuleExports(filename) {
let module = CJSModule._cache[filename];
if (module) {
const cached = cjsParseCache.get(module);
if (cached)
return { module, exportNames: cached.exportNames };
}
const loaded = Boolean(module);
if (!loaded) {
module = new CJSModule(filename);
module.filename = filename;
module.paths = CJSModule._nodeModulePaths(module.path);
CJSModule._cache[filename] = module;
}
let source;
try {
source = readFileSync(filename, 'utf8');
} catch {}
const { exports, reexports } = cjsParse(source || '');
const exportNames = new SafeSet(exports);
// Set first for cycles.
cjsParseCache.set(module, { source, exportNames, loaded });
if (reexports.length) {
module.filename = filename;
module.paths = CJSModule._nodeModulePaths(module.path);
}
for (const reexport of reexports) {
let resolved;
try {
resolved = CJSModule._resolveFilename(reexport, module);
} catch {
continue;
}
const ext = extname(resolved);
if (ext === '.js' || ext === '.cjs' || !CJSModule._extensions[ext]) {
const { exportNames: reexportNames } = cjsPreparseModuleExports(resolved);
for (const name of reexportNames)
exportNames.add(name);
}
}
return { module, exportNames };
}
// Strategy for loading a node builtin CommonJS module that isn't
// through normal resolution
translators.set('builtin', async function builtinStrategy(url) {
debug(`Translating BuiltinModule ${url}`);
// Slice 'nodejs:' scheme
const id = url.slice(7);
const module = loadNativeModule(id, url, true);
if (!url.startsWith('nodejs:') || !module) {
throw new ERR_UNKNOWN_BUILTIN_MODULE(id);
}
debug(`Loading BuiltinModule ${url}`);
return module.getESMFacade();
});
// Strategy for loading a JSON file
translators.set('json', async function jsonStrategy(url) {
emitExperimentalWarning('Importing JSON modules');
debug(`Translating JSONModule ${url}`);
debug(`Loading JSONModule ${url}`);
const pathname = url.startsWith('file:') ? fileURLToPath(url) : null;
let modulePath;
let module;
if (pathname) {
modulePath = isWindows ?
StringPrototypeReplace(pathname, winSepRegEx, '\\') : pathname;
module = CJSModule._cache[modulePath];
if (module && module.loaded) {
const exports = module.exports;
return new ModuleWrap(url, undefined, ['default'], function() {
this.setExport('default', exports);
});
}
}
let { source } = await this._getSource(
url, { format: 'json' }, defaultGetSource);
assertBufferSource(source, true, 'getSource');
({ source } = await this._transformSource(
source, { url, format: 'json' }, defaultTransformSource));
source = stringify(source);
if (pathname) {
// A require call could have been called on the same file during loading and
// that resolves synchronously. To make sure we always return the identical
// export, we have to check again if the module already exists or not.
module = CJSModule._cache[modulePath];
if (module && module.loaded) {
const exports = module.exports;
return new ModuleWrap(url, undefined, ['default'], function() {
this.setExport('default', exports);
});
}
}
try {
const exports = JSONParse(stripBOM(source));
module = {
exports,
loaded: true
};
} catch (err) {
// TODO (BridgeAR): We could add a NodeCore error that wraps the JSON
// parse error instead of just manipulating the original error message.
// That would allow to add further properties and maybe additional
// debugging information.
err.message = errPath(url) + ': ' + err.message;
throw err;
}
if (pathname) {
CJSModule._cache[modulePath] = module;
}
return new ModuleWrap(url, undefined, ['default'], function() {
debug(`Parsing JSONModule ${url}`);
this.setExport('default', module.exports);
});
});
// Strategy for loading a wasm module
translators.set('wasm', async function(url) {
emitExperimentalWarning('Importing Web Assembly modules');
let { source } = await this._getSource(
url, { format: 'wasm' }, defaultGetSource);
assertBufferSource(source, false, 'getSource');
({ source } = await this._transformSource(
source, { url, format: 'wasm' }, defaultTransformSource));
assertBufferSource(source, false, 'transformSource');
debug(`Translating WASMModule ${url}`);
let compiled;
try {
compiled = await WebAssembly.compile(source);
} catch (err) {
err.message = errPath(url) + ': ' + err.message;
throw err;
}
const imports =
WebAssembly.Module.imports(compiled).map(({ module }) => module);
const exports = WebAssembly.Module.exports(compiled).map(({ name }) => name);
return createDynamicModule(imports, exports, url, (reflect) => {
const { exports } = new WebAssembly.Instance(compiled, reflect.imports);
for (const expt of ObjectKeys(exports))
reflect.exports[expt].set(exports[expt]);
}).module;
});
|