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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| import { PassThrough, Transform } from 'node:stream'; | ||
| import { fileTypeFromStream } from 'file-type'; | ||
|
|
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| import { AnyFn } from './types.js'; | ||
|
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| export class FileType extends Transform { | ||
| #stream: PassThrough | null; | ||
| #result: Promise<{ ext: string; mime: string } | null>; | ||
| #transformCalled: boolean; | ||
|
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| constructor() { | ||
| super(); | ||
| this.#stream = new PassThrough(); | ||
|
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| this.#result = fileTypeFromStream(this.#stream).then( | ||
| (value) => { | ||
| this.#stream = null; | ||
| return value || null; | ||
| }, | ||
| (err) => { | ||
| this.#stream = null; | ||
| return null; | ||
| }, | ||
| ); | ||
| } | ||
|
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| fileTypePromise() { | ||
| return this.#result; | ||
| } | ||
|
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| override _transform(chunk: any, _: any, cb: AnyFn) { | ||
| this.#transformCalled = true; | ||
| if (this.#stream != null) { | ||
| this.#stream.write(chunk); | ||
| } | ||
|
|
||
| cb(null, chunk); | ||
| } | ||
|
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| override _flush(cb: AnyFn) { | ||
| if (this.#transformCalled) { | ||
| this.#result.finally(() => this.finish(cb)); | ||
| } else { | ||
| this.finish(cb); | ||
| } | ||
| } | ||
|
|
||
| protected finish(cb: AnyFn) { | ||
| cb(null); | ||
| this.#stream?.end(); | ||
| } | ||
| } |
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