Merge pull request #13725 from webpack/bugfix/serialize-json-as-buffer

serialize json data as buffer and decode on demand

lib/json/JsonData.js

@@ -0,0 +1,41 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { register } = require("../util/serialization");
+
+class JsonData {
+	constructor(data) {
+		this._buffer = undefined;
+		this._data = undefined;
+		if (Buffer.isBuffer(data)) {
+			this._buffer = data;
+		} else {
+			this._data = data;
+		}
+	}
+
+	get() {
+		if (this._data === undefined && this._buffer !== undefined) {
+			this._data = JSON.parse(this._buffer.toString());
+		}
+		return this._data;
+	}
+}
+
+register(JsonData, "webpack/lib/json/JsonData", null, {
+	serialize(obj, { write }) {
+		if (obj._buffer === undefined && obj._data !== undefined) {
+			obj._buffer = Buffer.from(JSON.stringify(obj._data));
+		}
+		write(obj._buffer);
+	},
+	deserialize({ read }) {
+		return new JsonData(read());
+	}
+});
+
+module.exports = JsonData;

lib/json/JsonGenerator.js

@@ -116,7 +116,10 @@ class JsonGenerator extends Generator {
 	 * @returns {number} estimate size of the module
 	 */
 	getSize(module, type) {
-		let data = module.buildInfo && module.buildInfo.jsonData;
+		let data =
+			module.buildInfo &&
+			module.buildInfo.jsonData &&
+			module.buildInfo.jsonData.get();
 		if (!data) return 0;
 		return stringifySafe(data).length + 10;
 	}
@@ -145,7 +148,10 @@ class JsonGenerator extends Generator {
 			concatenationScope
 		}
 	) {
-		const data = module.buildInfo && module.buildInfo.jsonData;
+		const data =
+			module.buildInfo &&
+			module.buildInfo.jsonData &&
+			module.buildInfo.jsonData.get();
 		if (data === undefined) {
 			return new RawSource(
 				runtimeTemplate.missingModuleStatement({

lib/json/JsonParser.js

@@ -8,6 +8,7 @@
 const parseJson = require("json-parse-better-errors");
 const Parser = require("../Parser");
 const JsonExportsDependency = require("../dependencies/JsonExportsDependency");
+const JsonData = require("./JsonData");
 
 /** @typedef {import("../../declarations/plugins/JsonModulesPluginParser").JsonModulesPluginParserOptions} JsonModulesPluginParserOptions */
 /** @typedef {import("../Parser").ParserState} ParserState */
@@ -41,7 +42,7 @@ class JsonParser extends Parser {
 				? source
 				: parseFn(source[0] === "\ufeff" ? source.slice(1) : source);
 
-		state.module.buildInfo.jsonData = data;
+		state.module.buildInfo.jsonData = new JsonData(data);
 		state.module.buildInfo.strict = true;
 		state.module.buildMeta.exportsType = "default";
 		state.module.buildMeta.defaultObject =

lib/util/internalSerializables.js

@@ -156,6 +156,7 @@ module.exports = {
 		require("../dependencies/WebpackIsIncludedDependency"),
 	"dependencies/WorkerDependency": () =>
 		require("../dependencies/WorkerDependency"),
+	"json/JsonData": () => require("../json/JsonData"),
 	"optimize/ConcatenatedModule": () =>
 		require("../optimize/ConcatenatedModule"),
 	DelegatedModule: () => require("../DelegatedModule"),