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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@@ -1389,7 +1389,10 @@ 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,
 
@@ -266,14 +266,20 @@ 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
`@@ -1389,7 +1389,10 @@ function loadESMFromCJS(mod, filename) {`
`1389`	`1389`	messagePrefix = `${from} is loading ES Module ${to} using require().\n`;
`1390`	`1390`	`}`
`1391`	`1391`	`}`
`1392`		`- emitExperimentalWarning('Support for loading ES Module in require()', messagePrefix);`
	`1392`	`+ emitExperimentalWarning('Support for loading ES Module in require()',`
	`1393`	`+ messagePrefix,`
	`1394`	`+ undefined,`
	`1395`	`+ parent?.require);`
`1393`	`1396`	`const {`
`1394`	`1397`	`wrap,`
`1395`	`1398`	`namespace,`
Original file line number	Diff line number	Diff line change
`@@ -266,14 +266,20 @@ function slowCases(enc) {`
`266`	`266`	`}`
`267`	`267`	`}`
`268`	`268`
`269`		`-function emitExperimentalWarning(feature, messagePrefix) {`
	`269`	`+/**`
	`270`	`+ * @param {string} feature Feature name used in the warning message`
	`271`	`+ * @param {string} messagePrefix Prefix of the warning message`
	`272`	`+ * @param {string} code See documentation of process.emitWarning`
	`273`	`+ * @param {string} ctor See documentation of process.emitWarning`
	`274`	`+ */`
	`275`	`+function emitExperimentalWarning(feature, messagePrefix, code, ctor) {`
`270`	`276`	`if (experimentalWarnings.has(feature)) return;`
`271`	`277`	`experimentalWarnings.add(feature);`
`272`	`278`	let msg = `${feature} is an experimental feature and might change at any time`;
`273`	`279`	`if (messagePrefix) {`
`274`	`280`	`msg = messagePrefix + msg;`
`275`	`281`	`}`
`276`		`- process.emitWarning(msg, 'ExperimentalWarning');`
	`282`	`+ process.emitWarning(msg, 'ExperimentalWarning', code, ctor);`
`277`	`283`	`}`
`278`	`284`
`279`	`285`	`function filterDuplicateStrings(items, low) {`