nodejs
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‎lib/internal/modules/cjs/loader.js‎
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‎lib/internal/modules/cjs/loader.js‎
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+4-1Lines changed: 4 additions & 1 deletion
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‎lib/internal/util.js‎
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‎lib/internal/util.js‎
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+8-2Lines changed: 8 additions & 2 deletions
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‎test/es-module/test-require-module-warning.js‎
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‎test/es-module/test-require-module-warning.js‎
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‎test/fixtures/es-modules/require-module.js‎
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‎test/fixtures/es-modules/require-module.js‎
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@@ -1360,7 +1360,10 @@ function loadESMFromCJS(mod, filename) {
         messagePrefix = `${from} is loading ES Module ${to} using require().\n`;
       }
     }
-    emitExperimentalWarning('Support for loading ES Module in require()', messagePrefix);
+    emitExperimentalWarning('Support for loading ES Module in require()',
+                            messagePrefix,
+                            undefined,
+                            parent?.require);
     const {
       wrap,
       namespace,
 
@@ -255,14 +255,20 @@ function slowCases(enc) {
   }
 }
 
-function emitExperimentalWarning(feature, messagePrefix) {
+/**
+ * @param {string} feature Feature name used in the warning message
+ * @param {string} messagePrefix Prefix of the warning message
+ * @param {string} code See documentation of process.emitWarning
+ * @param {string} ctor See documentation of process.emitWarning
+ */
+function emitExperimentalWarning(feature, messagePrefix, code, ctor) {
   if (experimentalWarnings.has(feature)) return;
   experimentalWarnings.add(feature);
   let msg = `${feature} is an experimental feature and might change at any time`;
   if (messagePrefix) {
     msg = messagePrefix + msg;
   }
-  process.emitWarning(msg, 'ExperimentalWarning');
+  process.emitWarning(msg, 'ExperimentalWarning', code, ctor);
 }
 
 function filterDuplicateStrings(items, low) {
 
@@ -0,0 +1,35 @@
+'use strict';
+
+// This checks the warning and the stack trace emitted by the require(esm)
+// experimental warning. It can get removed when `require(esm)` becomes stable.
+
+require('../common');
+const { spawnSyncAndAssert } = require('../common/child_process');
+const fixtures = require('../common/fixtures');
+const assert = require('assert');
+
+spawnSyncAndAssert(process.execPath, [
+  '--trace-warnings',
+  fixtures.path('es-modules', 'require-module.js'),
+], {
+  trim: true,
+  stderr(output) {
+    const lines = output.split('\n');
+    assert.match(
+      lines[0],
+      /ExperimentalWarning: CommonJS module .*require-module\.js is loading ES Module .*message\.mjs/
+    );
+    assert.strictEqual(
+      lines[1],
+      'Support for loading ES Module in require() is an experimental feature and might change at any time'
+    );
+    assert.match(
+      lines[2],
+      /at require \(.*modules\/helpers:\d+:\d+\)/
+    );
+    assert.match(
+      lines[3],
+      /at Object\.<anonymous> \(.*require-module\.js:1:1\)/
+    );
+  }
+});
@@ -0,0 +1 @@
+require('./message.mjs');
Original file line number	Diff line number	Diff line change
`@@ -1360,7 +1360,10 @@ function loadESMFromCJS(mod, filename) {`
`1360`	`1360`	messagePrefix = `${from} is loading ES Module ${to} using require().\n`;
`1361`	`1361`	`}`
`1362`	`1362`	`}`
`1363`		`- emitExperimentalWarning('Support for loading ES Module in require()', messagePrefix);`
	`1363`	`+ emitExperimentalWarning('Support for loading ES Module in require()',`
	`1364`	`+ messagePrefix,`
	`1365`	`+ undefined,`
	`1366`	`+ parent?.require);`
`1364`	`1367`	`const {`
`1365`	`1368`	`wrap,`
`1366`	`1369`	`namespace,`
Original file line number	Diff line number	Diff line change
`@@ -255,14 +255,20 @@ function slowCases(enc) {`
`255`	`255`	`}`
`256`	`256`	`}`
`257`	`257`
`258`		`-function emitExperimentalWarning(feature, messagePrefix) {`
	`258`	`+/**`
	`259`	`+ * @param {string} feature Feature name used in the warning message`
	`260`	`+ * @param {string} messagePrefix Prefix of the warning message`
	`261`	`+ * @param {string} code See documentation of process.emitWarning`
	`262`	`+ * @param {string} ctor See documentation of process.emitWarning`
	`263`	`+ */`
	`264`	`+function emitExperimentalWarning(feature, messagePrefix, code, ctor) {`
`259`	`265`	`if (experimentalWarnings.has(feature)) return;`
`260`	`266`	`experimentalWarnings.add(feature);`
`261`	`267`	let msg = `${feature} is an experimental feature and might change at any time`;
`262`	`268`	`if (messagePrefix) {`
`263`	`269`	`msg = messagePrefix + msg;`
`264`	`270`	`}`
`265`		`- process.emitWarning(msg, 'ExperimentalWarning');`
	`271`	`+ process.emitWarning(msg, 'ExperimentalWarning', code, ctor);`
`266`	`272`	`}`
`267`	`273`
`268`	`274`	`function filterDuplicateStrings(items, low) {`