@gameye/sdk/module/streams/reduce-transform.js

Node.js SDK for Gameye

import * as stream from "stream";
export class ReduceTransform extends stream.Transform {
    constructor(fn, initialState) {
        super({ objectMode: true });
        this.fn = fn;
        if (initialState === undefined) {
            this.state = fn();
        }
        else {
            this.state = initialState;
        }
    }
    _transform(chunk, encoding, callback) {
        const { fn } = this;
        let { state } = this;
        this.state = state = fn(state, chunk);
        callback(undefined, state);
    }
}
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