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Viewing file:     stream-utils.js (677 B)      -rw-r--r--

'use strict';
const {Transform} = require('stream');

class ObjectTransform extends Transform {
	constructor() {
		super({
			objectMode: true
		});
	}
}

class FilterStream extends ObjectTransform {
	constructor(filter) {
		super();
		this._filter = filter;
	}

	_transform(data, encoding, callback) {
		if (this._filter(data)) {
			this.push(data);
		}

		callback();
	}
}

class UniqueStream extends ObjectTransform {
	constructor() {
		super();
		this._pushed = new Set();
	}

	_transform(data, encoding, callback) {
		if (!this._pushed.has(data)) {
			this.push(data);
			this._pushed.add(data);
		}

		callback();
	}
}

module.exports = {
	FilterStream,
	UniqueStream
};