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