Source.js
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	/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
	*/
	"use strict";

	class Source {
	source() {
	throw new Error("Abstract");
	}

	buffer() {
	const source = this.source();
	if (Buffer.isBuffer(source)) return source;
	return Buffer.from(source, "utf-8");
	}

	size() {
	return this.buffer().length;
	}

	map(options) {
	return null;
	}

	sourceAndMap(options) {
	return {
	source: this.source(),
	map: this.map(options)
	};
	}

	updateHash(hash) {
	throw new Error("Abstract");
	}
	}

	module.exports = Source;