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app_vue/node_modules/webpack/lib/dependencies/PureExpressionDependency.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { UsageState } = require("../ExportsInfo");
+const makeSerializable = require("../util/makeSerializable");
+const { filterRuntime, runtimeToString } = require("../util/runtime");
+const NullDependency = require("./NullDependency");
+
+/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
+/** @typedef {import("../ChunkGraph")} ChunkGraph */
+/** @typedef {import("../Dependency")} Dependency */
+/** @typedef {import("../Dependency").RuntimeSpec} RuntimeSpec */
+/** @typedef {import("../Dependency").UpdateHashContext} UpdateHashContext */
+/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
+/** @typedef {import("../Module")} Module */
+/** @typedef {import("../ModuleGraph")} ModuleGraph */
+/** @typedef {import("../ModuleGraphConnection").ConnectionState} ConnectionState */
+/** @typedef {import("../javascript/JavascriptParser").Range} Range */
+/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
+/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
+/** @typedef {import("../util/Hash")} Hash */
+
+class PureExpressionDependency extends NullDependency {
+	/**
+	 * @param {Range} range the source range
+	 */
+	constructor(range) {
+		super();
+		this.range = range;
+		/** @type {Set<string> | false} */
+		this.usedByExports = false;
+	}
+
+	/**
+	 * @param {ModuleGraph} moduleGraph module graph
+	 * @param {RuntimeSpec} runtime current runtimes
+	 * @returns {boolean | RuntimeSpec} runtime condition
+	 */
+	_getRuntimeCondition(moduleGraph, runtime) {
+		const usedByExports = this.usedByExports;
+		if (usedByExports !== false) {
+			const selfModule =
+				/** @type {Module} */
+				(moduleGraph.getParentModule(this));
+			const exportsInfo = moduleGraph.getExportsInfo(selfModule);
+			const runtimeCondition = filterRuntime(runtime, runtime => {
+				for (const exportName of usedByExports) {
+					if (exportsInfo.getUsed(exportName, runtime) !== UsageState.Unused) {
+						return true;
+					}
+				}
+				return false;
+			});
+			return runtimeCondition;
+		}
+		return false;
+	}
+
+	/**
+	 * Update the hash
+	 * @param {Hash} hash hash to be updated
+	 * @param {UpdateHashContext} context context
+	 * @returns {void}
+	 */
+	updateHash(hash, context) {
+		const runtimeCondition = this._getRuntimeCondition(
+			context.chunkGraph.moduleGraph,
+			context.runtime
+		);
+		if (runtimeCondition === true) {
+			return;
+		} else if (runtimeCondition === false) {
+			hash.update("null");
+		} else {
+			hash.update(
+				`${runtimeToString(runtimeCondition)}|${runtimeToString(
+					context.runtime
+				)}`
+			);
+		}
+		hash.update(String(this.range));
+	}
+
+	/**
+	 * @param {ModuleGraph} moduleGraph the module graph
+	 * @returns {ConnectionState} how this dependency connects the module to referencing modules
+	 */
+	getModuleEvaluationSideEffectsState(moduleGraph) {
+		return false;
+	}
+
+	/**
+	 * @param {ObjectSerializerContext} context context
+	 */
+	serialize(context) {
+		const { write } = context;
+		write(this.range);
+		write(this.usedByExports);
+		super.serialize(context);
+	}
+
+	/**
+	 * @param {ObjectDeserializerContext} context context
+	 */
+	deserialize(context) {
+		const { read } = context;
+		this.range = read();
+		this.usedByExports = read();
+		super.deserialize(context);
+	}
+}
+
+makeSerializable(
+	PureExpressionDependency,
+	"webpack/lib/dependencies/PureExpressionDependency"
+);
+
+PureExpressionDependency.Template = class PureExpressionDependencyTemplate extends (
+	NullDependency.Template
+) {
+	/**
+	 * @param {Dependency} dependency the dependency for which the template should be applied
+	 * @param {ReplaceSource} source the current replace source which can be modified
+	 * @param {DependencyTemplateContext} templateContext the context object
+	 * @returns {void}
+	 */
+	apply(
+		dependency,
+		source,
+		{ chunkGraph, moduleGraph, runtime, runtimeTemplate, runtimeRequirements }
+	) {
+		const dep = /** @type {PureExpressionDependency} */ (dependency);
+		const runtimeCondition = dep._getRuntimeCondition(moduleGraph, runtime);
+		if (runtimeCondition === true) {
+			// Do nothing
+		} else if (runtimeCondition === false) {
+			source.insert(
+				dep.range[0],
+				"(/* unused pure expression or super */ null && ("
+			);
+			source.insert(dep.range[1], "))");
+		} else {
+			const condition = runtimeTemplate.runtimeConditionExpression({
+				chunkGraph,
+				runtime,
+				runtimeCondition,
+				runtimeRequirements
+			});
+			source.insert(
+				dep.range[0],
+				`(/* runtime-dependent pure expression or super */ ${condition} ? (`
+			);
+			source.insert(dep.range[1], ") : null)");
+		}
+	}
+};
+
+module.exports = PureExpressionDependency;