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01b6da9d9b
Ref https://github.com/denoland/deno/issues/28836 This PR replaces the _stream.mjs bundle with a file-by-file port instead. A codemod transpiles Node.js internals to ESM. The codemod performs three tasks: translating CJS to ESM, remapping internal dependencies, and hoisting lazy requires as imports. The process is fully automated through the `update_node_stream.ts` script, simplifying future internal updates. The script checks out Node.js from a specific tag defined in the `tests/node_compat/runner`. Additionally, the update enables new tests in our Node test runner and adds features (like compose()) that were missing from the outdated bundle. ## Performance There is a 140KB+ binary size increase on aarch64-apple-darwin and nop startup time stays the same.
60 lines
1.5 KiB
JavaScript
60 lines
1.5 KiB
JavaScript
// deno-lint-ignore-file
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// Copyright 2018-2025 the Deno authors. MIT license.
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import { primordials } from "ext:core/mod.js";
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import stream from "node:stream";
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// LazyTransform is a special type of Transform stream that is lazily loaded.
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// This is used for performance with bi-API-ship: when two APIs are available
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// for the stream, one conventional and one non-conventional.
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"use strict";
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const {
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ObjectDefineProperties,
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ObjectDefineProperty,
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ObjectSetPrototypeOf,
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} = primordials;
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function LazyTransform(options) {
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this._options = options;
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}
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ObjectSetPrototypeOf(LazyTransform.prototype, stream.Transform.prototype);
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ObjectSetPrototypeOf(LazyTransform, stream.Transform);
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function makeGetter(name) {
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return function () {
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stream.Transform.call(this, this._options);
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this._writableState.decodeStrings = false;
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return this[name];
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};
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}
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function makeSetter(name) {
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return function (val) {
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ObjectDefineProperty(this, name, {
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__proto__: null,
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value: val,
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enumerable: true,
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configurable: true,
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writable: true,
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});
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};
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}
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ObjectDefineProperties(LazyTransform.prototype, {
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_readableState: {
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__proto__: null,
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get: makeGetter("_readableState"),
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set: makeSetter("_readableState"),
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configurable: true,
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enumerable: true,
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},
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_writableState: {
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__proto__: null,
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get: makeGetter("_writableState"),
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set: makeSetter("_writableState"),
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configurable: true,
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enumerable: true,
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},
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});
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export default LazyTransform;
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export { LazyTransform };
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