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module: do not warn for typeless package.json when there isn't one #54045

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Jul 29, 2024
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module: do not warn for typeless package.json when there isn't one #54045

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13 changes: 7 additions & 6 deletions lib/internal/modules/esm/get_format.js
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Original file line number Diff line number Diff line change
Expand Up @@ -98,8 +98,9 @@ let typelessPackageJsonFilesWarnedAbout;
function warnTypelessPackageJsonFile(pjsonPath, url) {
typelessPackageJsonFilesWarnedAbout ??= new SafeSet();
if (!typelessPackageJsonFilesWarnedAbout.has(pjsonPath)) {
const warning = `${url} parsed as an ES module because module syntax was detected;` +
` to avoid the performance penalty of syntax detection, add "type": "module" to ${pjsonPath}`;
const warning = `Module type of ${url} is not specified and it doesn't parse as CommonJS.\n` +
'Reparsing as ES module because module syntax was detected. This incurs a performance overhead.\n' +
`To eliminate this warning, add "type": "module" to ${pjsonPath}.`;
process.emitWarning(warning, {
code: 'MODULE_TYPELESS_PACKAGE_JSON',
});
Expand All @@ -118,7 +119,7 @@ function getFileProtocolModuleFormat(url, context = { __proto__: null }, ignoreE
const ext = extname(url);

if (ext === '.js') {
const { type: packageType, pjsonPath } = getPackageScopeConfig(url);
const { type: packageType, pjsonPath, exists: foundPackageJson } = getPackageScopeConfig(url);
if (packageType !== 'none') {
return packageType;
}
Expand All @@ -139,7 +140,7 @@ function getFileProtocolModuleFormat(url, context = { __proto__: null }, ignoreE
// For ambiguous files (no type field, .js extension) we return
// undefined from `resolve` and re-run the check in `load`.
const format = detectModuleFormat(source, url);
if (format === 'module') {
if (format === 'module' && foundPackageJson) {
// This module has a .js extension, a package.json with no `type` field, and ESM syntax.
// Warn about the missing `type` field so that the user can avoid the performance penalty of detection.
warnTypelessPackageJsonFile(pjsonPath, url);
Expand All @@ -149,7 +150,7 @@ function getFileProtocolModuleFormat(url, context = { __proto__: null }, ignoreE
}
}
if (ext === '.ts' && getOptionValue('--experimental-strip-types')) {
const { type: packageType, pjsonPath } = getPackageScopeConfig(url);
const { type: packageType, pjsonPath, exists: foundPackageJson } = getPackageScopeConfig(url);
if (packageType !== 'none') {
return `${packageType}-typescript`;
}
Expand All @@ -170,7 +171,7 @@ function getFileProtocolModuleFormat(url, context = { __proto__: null }, ignoreE
const parsedSource = tsParse(source);
const detectedFormat = detectModuleFormat(parsedSource, url);
const format = detectedFormat ? `${detectedFormat}-typescript` : 'commonjs-typescript';
if (format === 'module-typescript') {
if (format === 'module-typescript' && foundPackageJson) {
// This module has a .js extension, a package.json with no `type` field, and ESM syntax.
// Warn about the missing `type` field so that the user can avoid the performance penalty of detection.
warnTypelessPackageJsonFile(pjsonPath, url);
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12 changes: 12 additions & 0 deletions test/es-module/test-esm-detect-ambiguous.mjs
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Expand Up @@ -352,6 +352,18 @@ describe('Module syntax detection', { concurrency: !process.env.TEST_PARALLEL },
});
}

it('does not warn when there are no package.json', async () => {
const { stdout, stderr, code, signal } = await spawnPromisified(process.execPath, [
fixtures.path('es-modules/loose.js'),
]);

strictEqual(stderr, '');
strictEqual(stdout, 'executed\n');
strictEqual(code, 0);
strictEqual(signal, null);
});


it('warns only once for a package.json that affects multiple files', async () => {
const { stdout, stderr, code, signal } = await spawnPromisified(process.execPath, [
fixtures.path('es-modules/package-without-type/detected-as-esm.js'),
Expand Down
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