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feat(transformer): added initial draft for transformer uglify
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| import { Transform, TransformCallback } from 'stream'; | ||
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| export class FileInMemoryTransformer extends Transform { | ||
| constructor() { | ||
| super(); | ||
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| this.memory = Buffer.alloc(0); | ||
| } | ||
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| private memory: Buffer; | ||
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| _transform(chunk: Buffer, _: string, cb: TransformCallback): void { | ||
| this.memory = Buffer.concat([this.memory, chunk]); | ||
| cb(); | ||
| } | ||
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| _flush(cb: TransformCallback): void { | ||
| this.push(this.memory); | ||
| cb(); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| import { Transform } from 'stream'; | ||
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| export class MemoryStream extends Transform { | ||
| constructor(private readonly desiredChunkSize: number) { | ||
| super(); | ||
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| this.memory = Buffer.alloc(0); | ||
| } | ||
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| private memory: Buffer; | ||
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| _transform(chunk: Buffer, _: string, cb: () => void): void { | ||
| if ( | ||
| Buffer.byteLength(this.memory) + Buffer.byteLength(chunk) >= | ||
| this.desiredChunkSize | ||
| ) { | ||
| this.push(this.memory); | ||
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| this.memory = Buffer.alloc(0); | ||
| } | ||
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| this.memory = Buffer.concat([this.memory, chunk]); | ||
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| cb(); | ||
| } | ||
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| _flush(cb: () => void): void { | ||
| this.push(this.memory); | ||
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| cb(); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| import { Transform, TransformCallback } from 'stream'; | ||
| import { MinifyOptions, minify } from 'terser'; | ||
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| export class UglifyJsTransformer extends Transform { | ||
| constructor( | ||
| protected readonly filePath: string, | ||
| protected readonly uglifyOptions: MinifyOptions = {}, | ||
| ) { | ||
| super(); | ||
| } | ||
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| protected chunks: number = 0; | ||
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| async _transform( | ||
| chunk: Buffer, | ||
| encoding: string, | ||
| callback: TransformCallback, | ||
| ): Promise<void> { | ||
| if (this.chunks > 0) { | ||
| return callback( | ||
| new Error( | ||
| 'This transformer should not be called more than once. Check if you use MemoryStream before using UglifyJsTransformer', | ||
| ), | ||
| ); | ||
| } | ||
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| console.log(`${this.filePath}:${chunk.byteLength}`); | ||
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| const code = chunk.toString('utf-8'); | ||
| const result = await minify(code, this.uglifyOptions).catch(() => null); | ||
| const data = | ||
| !result || !result.code ? chunk : Buffer.from(result.code, 'utf-8'); | ||
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| this.chunks++; | ||
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| this.push(data); | ||
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| callback(); | ||
| } | ||
| } |
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