webpack/lib/json/JsonData.js

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const { register } = require("../util/serialization");

/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
/** @typedef {import("../util/Hash")} Hash */
/** @typedef {import("./JsonModulesPlugin").RawJsonData} RawJsonData */

class JsonData {
	/**
	 * @param {Buffer | RawJsonData} data JSON data
	 */
	constructor(data) {
		/** @type {Buffer | undefined} */
		this._buffer = undefined;
		/** @type {RawJsonData | undefined} */
		this._data = undefined;
		if (Buffer.isBuffer(data)) {
			this._buffer = data;
		} else {
			this._data = data;
		}
	}

	/**
	 * @returns {RawJsonData|undefined} Raw JSON data
	 */
	get() {
		if (this._data === undefined && this._buffer !== undefined) {
			this._data = JSON.parse(this._buffer.toString());
		}
		return this._data;
	}

	/**
	 * @param {Hash} hash hash to be updated
	 * @returns {void} the updated hash
	 */
	updateHash(hash) {
		if (this._buffer === undefined && this._data !== undefined) {
			this._buffer = Buffer.from(JSON.stringify(this._data));
		}

		if (this._buffer) hash.update(this._buffer);
	}
}

register(JsonData, "webpack/lib/json/JsonData", null, {
	/**
	 * @param {JsonData} obj JSONData object
	 * @param {ObjectSerializerContext} context context
	 */
	serialize(obj, { write }) {
		if (obj._buffer === undefined && obj._data !== undefined) {
			obj._buffer = Buffer.from(JSON.stringify(obj._data));
		}
		write(obj._buffer);
	},
	/**
	 * @param {ObjectDeserializerContext} context context
	 * @returns {JsonData} deserialized JSON data
	 */
	deserialize({ read }) {
		return new JsonData(read());
	}
});

module.exports = JsonData;