12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576
import { Buffer } from "./deps.ts";import { EncoderStream, DecoderStream } from "./type.d.ts";
const BOMChar = '\uFEFF';
export class PrependBOMWrapper {    encoder: EncoderStream;  addBOM: boolean;    // deno-lint-ignore no-explicit-any  constructor(encoder: EncoderStream, _options: any) {    this.encoder = encoder;    this.addBOM = true;  }    write(str: string) {    if (this.addBOM) {      str = BOMChar + str;      this.addBOM = false;    }    return this.encoder.write(str);  }    end() {    return this.encoder.end();  }  }export const PrependBOM = PrependBOMWrapper;
//------------------------------------------------------------------------------
export class StripBOMWrapper {    decoder: DecoderStream;  pass: boolean;  options: {    stripBOM?: boolean | (() => void);  }    constructor(    decoder: DecoderStream,    options?: {      stripBOM?: boolean | (() => void);    },  ) {    this.decoder = decoder;    this.pass = false;    this.options = options || {};  }    write(buf: Buffer) {    let res = this.decoder.write(buf);    if (this.pass || !res) {      return res;    }        if (res[0] === BOMChar) {      res = res.slice(1);      if (typeof this.options?.stripBOM === 'function') {        this.options.stripBOM();      }    }        this.pass = true;    return res;  }    end() {    return this.decoder.end();  }  }export const StripBOM = StripBOMWrapper;