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node_modules/webpack/lib/dependencies/ExternalModuleInitFragment.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Ivan Kopeykin @vankop
+*/
+
+"use strict";
+
+const InitFragment = require("../InitFragment");
+const makeSerializable = require("../util/makeSerializable");
+
+/** @typedef {import("webpack-sources").Source} Source */
+/** @typedef {import("../Generator").GenerateContext} GenerateContext */
+/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
+/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
+/** @typedef {Map<string, Set<string>>} ImportSpecifiers */
+
+/**
+ * @extends {InitFragment<GenerateContext>}
+ */
+class ExternalModuleInitFragment extends InitFragment {
+	/**
+	 * @param {string} importedModule imported module
+	 * @param {Array<{ name: string, value?: string }> | ImportSpecifiers} specifiers import specifiers
+	 * @param {string=} defaultImport default import
+	 */
+	constructor(importedModule, specifiers, defaultImport) {
+		super(
+			undefined,
+			InitFragment.STAGE_CONSTANTS,
+			0,
+			`external module imports|${importedModule}|${defaultImport || "null"}`
+		);
+		this.importedModule = importedModule;
+		if (Array.isArray(specifiers)) {
+			/** @type {ImportSpecifiers} */
+			this.specifiers = new Map();
+			for (const { name, value } of specifiers) {
+				let specifiers = this.specifiers.get(name);
+				if (!specifiers) {
+					specifiers = new Set();
+					this.specifiers.set(name, specifiers);
+				}
+				specifiers.add(value || name);
+			}
+		} else {
+			this.specifiers = specifiers;
+		}
+		this.defaultImport = defaultImport;
+	}
+
+	/**
+	 * @param {ExternalModuleInitFragment} other other
+	 * @returns {ExternalModuleInitFragment} ExternalModuleInitFragment
+	 */
+	merge(other) {
+		const newSpecifiersMap = new Map(this.specifiers);
+		for (const [name, specifiers] of other.specifiers) {
+			if (newSpecifiersMap.has(name)) {
+				const currentSpecifiers =
+					/** @type {Set<string>} */
+					(newSpecifiersMap.get(name));
+				for (const spec of specifiers) currentSpecifiers.add(spec);
+			} else {
+				newSpecifiersMap.set(name, specifiers);
+			}
+		}
+		return new ExternalModuleInitFragment(
+			this.importedModule,
+			newSpecifiersMap,
+			this.defaultImport
+		);
+	}
+
+	/**
+	 * @param {GenerateContext} context context
+	 * @returns {string | Source | undefined} the source code that will be included as initialization code
+	 */
+	getContent({ runtimeRequirements }) {
+		const namedImports = [];
+
+		for (const [name, specifiers] of this.specifiers) {
+			for (const spec of specifiers) {
+				if (spec === name) {
+					namedImports.push(name);
+				} else {
+					namedImports.push(`${name} as ${spec}`);
+				}
+			}
+		}
+
+		let importsString =
+			namedImports.length > 0 ? `{${namedImports.join(",")}}` : "";
+
+		if (this.defaultImport) {
+			importsString = `${this.defaultImport}${
+				importsString ? `, ${importsString}` : ""
+			}`;
+		}
+
+		return `import ${importsString} from ${JSON.stringify(
+			this.importedModule
+		)};`;
+	}
+
+	/**
+	 * @param {ObjectSerializerContext} context context
+	 */
+	serialize(context) {
+		super.serialize(context);
+		const { write } = context;
+		write(this.importedModule);
+		write(this.specifiers);
+		write(this.defaultImport);
+	}
+
+	/**
+	 * @param {ObjectDeserializerContext} context context
+	 */
+	deserialize(context) {
+		super.deserialize(context);
+		const { read } = context;
+		this.importedModule = read();
+		this.specifiers = read();
+		this.defaultImport = read();
+	}
+}
+
+makeSerializable(
+	ExternalModuleInitFragment,
+	"webpack/lib/dependencies/ExternalModuleInitFragment"
+);
+
+module.exports = ExternalModuleInitFragment;