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module: add a condition to if in case of a bug. #40549

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module: add a condition to if in case of a bug. #40549

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5e7d26e
module: refactor get_format
iam-frankqiu Oct 21, 2021
c52be61
module: fix bug
iam-frankqiu Oct 21, 2021
1d612d4
esm: add a condition to if
iam-frankqiu Oct 27, 2021
d781db9
module: add some tests
iam-frankqiu Nov 2, 2021
e54325a
module: fix lint err
iam-frankqiu Nov 3, 2021
8d330e2
module: fix lint err
iam-frankqiu Nov 29, 2021
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12 changes: 8 additions & 4 deletions lib/internal/modules/esm/get_format.js
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Original file line number Diff line number Diff line change
Expand Up @@ -55,25 +55,29 @@ const protocolHandlers = ObjectAssign(ObjectCreate(null), {
},
'file:'(parsed, url) {
const ext = extname(parsed.pathname);
let format;
let format = null;

if (ext === '.js') {
format = getPackageType(parsed.href) === 'module' ? 'module' : 'commonjs';
} else {
format = extensionFormatMap[ext];
}
if (!format) {
if (experimentalSpecifierResolution === 'node') {
if (
experimentalSpecifierResolution === 'node' &&
legacyExtensionFormatMap[ext]
) {
process.emitWarning(
'The Node.js specifier resolution in ESM is experimental.',
'ExperimentalWarning');
'ExperimentalWarning'
);
format = legacyExtensionFormatMap[ext];
} else {
throw new ERR_UNKNOWN_FILE_EXTENSION(ext, fileURLToPath(url));
}
}

return format || null;
return format;
},
'node:'() { return 'builtin'; },
});
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13 changes: 13 additions & 0 deletions test/es-module/test-esm-get-format.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
require('../common');
const assert = require('assert');
const { defaultGetFormat} = require('internal/modules/esm/get_format');

{
const url = new URL('file://example.com/foo/bar.js')
assert.strictEqual(defaultGetFormat(url), 'commonjs')
}

{
const url = new URL('file://example.com/foo/bar.whatever')
assert.throws(() => defaultGetFormat(url), {name: 'TypeError', message: /Unknown file extension whatever/})
}