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module: runtime deprecate require.extensions #58642

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module: runtime deprecate require.extensions #58642

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2 changes: 1 addition & 1 deletion doc/api/deprecations.md
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Original file line number Diff line number Diff line change
Expand Up @@ -878,7 +878,7 @@ changes:
description: Documentation-only deprecation.
-->

Type: Documentation-only
Type: Runtime

The [`require.extensions`][] property is deprecated.
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@legendecas legendecas Jun 9, 2025 •
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I think an alternative, like module.register or module.registerHooks, should be recommended, and be stable, before runtime deprecating this.

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registerHooks, not register. The latter should go away once the former is ready. And registerHooks is a more appropriate replacement for extensions as both are sync.

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@marco-ippolito marco-ippolito Jun 9, 2025 •
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it would actually need an api that returns all the registered hooks + registerHooks


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15 changes: 13 additions & 2 deletions lib/internal/modules/helpers.js
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Expand Up @@ -26,7 +26,7 @@ const { pathToFileURL, fileURLToPath } = require('internal/url');
const assert = require('internal/assert');

const { getOptionValue } = require('internal/options');
const { setOwnProperty, getLazy } = require('internal/util');
const { setOwnProperty, getLazy, deprecate } = require('internal/util');
const { inspect } = require('internal/util/inspect');

const lazyTmpdir = getLazy(() => require('os').tmpdir());
Expand Down Expand Up @@ -160,8 +160,19 @@ function makeRequireFunction(mod) {

setOwnProperty(require, 'main', process.mainModule);

let extensions = Module._extensions;
// Enable support to add extra extension types.
require.extensions = Module._extensions;
ObjectDefineProperty(require, 'extensions', {
__proto__: null,
get: deprecate(() => {
return extensions;
}, 'require.extensions is deprecated', 'DEP0039'),
set: deprecate((value) => {
extensions = value;
}, 'require.extensions is deprecated', 'DEP0039'),
configurable: true,
enumerable: true,
});

require.cache = Module._cache;

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