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refactor(@angular-devkit/build-angular): use async pipeline helper in HTML rewriting stream

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The Node.js async `pipeline` helper function reduces the amount of infrastructure code
needed to pipe HTML content through the parse5 transform stream.
This commit is contained in:
Charles Lyding 2024-03-04 10:29:02 -05:00 committed by Alan Agius
parent ffeb3eb74e
commit b55bbde9c3
1 changed files with 11 additions and 34 deletions
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45
packages/angular_devkit/build_angular/src/utils/index-file/html-rewriting-stream.ts
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@ -6,7 +6,8 @@
* found in the LICENSE file at https://angular.io/license
*/
import { Readable, Writable } from 'stream';
import { Readable } from 'node:stream';
import { pipeline } from 'node:stream/promises';
import { loadEsmModule } from '../load-esm';
export async function htmlRewritingStream(content: string): Promise<{
@ -16,42 +17,18 @@ export async function htmlRewritingStream(content: string): Promise<{
const { RewritingStream } = await loadEsmModule<typeof import('parse5-html-rewriting-stream')>(
'parse5-html-rewriting-stream',
);
const chunks: Buffer[] = [];
const rewriter = new RewritingStream();
return {
rewriter,
transformedContent: () => {
return new Promise((resolve) => {
new Readable({
encoding: 'utf8',
read(): void {
this.push(Buffer.from(content));
this.push(null);
},
})
.pipe(rewriter)
.pipe(
new Writable({
write(
chunk: string | Buffer,
encoding: string | undefined,
callback: Function,
): void {
chunks.push(
typeof chunk === 'string'
? Buffer.from(chunk, encoding as BufferEncoding)
: chunk,
);
callback();
},
final(callback: (error?: Error) => void): void {
callback();
resolve(Buffer.concat(chunks).toString());
},
}),
);
});
},
transformedContent: () =>
pipeline(Readable.from(content), rewriter, async function (source) {
const chunks = [];
for await (const chunk of source) {
chunks.push(Buffer.from(chunk));
}
return Buffer.concat(chunks).toString('utf-8');
}),
};
}