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51 lines
1.9 KiB
TypeScript
51 lines
1.9 KiB
TypeScript
// Copyright 2016 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Polyfill for TextEncoderStream and TextDecoderStream
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// Modified by Sukka (https://skk.moe) to increase compatibility and performance with Bun.
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export class PolyfillTextDecoderStream extends TransformStream<Uint8Array, string> {
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readonly encoding: string;
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readonly fatal: boolean;
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readonly ignoreBOM: boolean;
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constructor(
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encoding: Bun.Encoding = 'utf-8',
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{ fatal = false, ignoreBOM = false }: ConstructorParameters<typeof TextDecoder>[1] = {}
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) {
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const decoder = new TextDecoder(encoding, { fatal, ignoreBOM });
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super({
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transform(chunk: Uint8Array, controller: TransformStreamDefaultController<string>) {
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const decoded = decoder.decode(chunk);
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controller.enqueue(decoded);
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},
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flush(controller: TransformStreamDefaultController<string>) {
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// If {fatal: false} is in options (the default), then the final call to
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// decode() can produce extra output (usually the unicode replacement
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// character 0xFFFD). When fatal is true, this call is just used for its
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// side-effect of throwing a TypeError exception if the input is
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// incomplete.
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const output = decoder.decode();
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if (output.length > 0) {
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controller.enqueue(output);
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}
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}
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});
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this.encoding = encoding;
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this.fatal = fatal;
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this.ignoreBOM = ignoreBOM;
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}
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}
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