1 files changed, 17 insertions, 1 deletions
diff --git a/src/node_i18n.h b/src/node_i18n.h
index cc1f3e6ea5..adf9feb414 100644
--- a/src/node_i18n.h
+++ b/src/node_i18n.h
@@ -37,10 +37,26 @@ namespace i18n {
 
 bool InitializeICUDirectory(const std::string& path);
 
+enum idna_mode {
+  // Default mode for maximum compatibility.
+  IDNA_DEFAULT,
+  // Ignore all errors in IDNA conversion, if possible.
+  IDNA_LENIENT,
+  // Enforce STD3 rules (UseSTD3ASCIIRules) and DNS length restrictions
+  // (VerifyDnsLength). Corresponds to `beStrict` flag in the "domain to ASCII"
+  // algorithm.
+  IDNA_STRICT
+};
+
+// Implements the WHATWG URL Standard "domain to ASCII" algorithm.
+// https://url.spec.whatwg.org/#concept-domain-to-ascii
 int32_t ToASCII(MaybeStackBuffer<char>* buf,
                 const char* input,
                 size_t length,
-                bool lenient = false);
+                enum idna_mode mode = IDNA_DEFAULT);
+
+// Implements the WHATWG URL Standard "domain to Unicode" algorithm.
+// https://url.spec.whatwg.org/#concept-domain-to-unicode
 int32_t ToUnicode(MaybeStackBuffer<char>* buf,
                   const char* input,
                   size_t length);