jtc-utils/mjs/lib/MemoryWritableStream.mjs

Utilities for Japanese Traditional Companies

export class MemoryWritableStream extends WritableStream {
    buf;
    constructor() {
        const buf = new Array();
        super({
            write(chunk) {
                buf.push(chunk);
            },
        });
        this.buf = buf;
    }
    toUint8Array() {
        let len = 0;
        for (const u8a of this.buf) {
            len += u8a.length;
        }
        const result = new Uint8Array(len);
        let pos = 0;
        for (const u8a of this.buf) {
            result.set(u8a, pos);
            pos += u8a.length;
        }
        return result;
    }
    toString(encoding = "uft-8") {
        return new TextDecoder(encoding.toLowerCase(), { ignoreBOM: true }).decode(this.toUint8Array());
    }
}