igir/dist/src/polyfill/fsReadTransform.js

🕹 A zero-setup ROM collection manager that sorts, filters, extracts or archives, patches, and reports on collections of any size on any OS.

import stream from 'node:stream';
/**
 * A stream transformer that tracks how many bytes have been read and calls a callback.
 */
export default class FsReadTransform extends stream.Transform {
    fsReadCallback;
    progress = 0;
    constructor(fsReadCallback) {
        super();
        this.fsReadCallback = fsReadCallback;
    }
    /**
     * Process the stream.
     */
    _transform(chunk, _encoding, callback) {
        this.progress += chunk.length;
        this.fsReadCallback(this.progress);
        // eslint-disable-next-line unicorn/no-null
        callback(null, chunk);
    }
}