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ConstDependency.js
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Thu, Feb 13, 13:36

ConstDependency.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const makeSerializable = require("../util/makeSerializable");
const NullDependency = require("./NullDependency");
/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../Dependency").UpdateHashContext} UpdateHashContext */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../ModuleGraphConnection").ConnectionState} ConnectionState */
/** @typedef {import("../util/Hash")} Hash */
class ConstDependency extends NullDependency {
/**
* @param {string} expression the expression
* @param {number|[number, number]} range the source range
* @param {string[]=} runtimeRequirements runtime requirements
*/
constructor(expression, range, runtimeRequirements) {
super();
this.expression = expression;
this.range = range;
this.runtimeRequirements = runtimeRequirements
? new Set(runtimeRequirements)
: null;
}
/**
* Update the hash
* @param {Hash} hash hash to be updated
* @param {UpdateHashContext} context context
* @returns {void}
*/
updateHash(hash, context) {
hash.update(this.range + "");
hash.update(this.expression + "");
if (this.runtimeRequirements)
hash.update(Array.from(this.runtimeRequirements).join() + "");
}
/**
* @param {ModuleGraph} moduleGraph the module graph
* @returns {ConnectionState} how this dependency connects the module to referencing modules
*/
getModuleEvaluationSideEffectsState(moduleGraph) {
return false;
}
serialize(context) {
const { write } = context;
write(this.expression);
write(this.range);
write(this.runtimeRequirements);
super.serialize(context);
}
deserialize(context) {
const { read } = context;
this.expression = read();
this.range = read();
this.runtimeRequirements = read();
super.deserialize(context);
}
}
makeSerializable(ConstDependency, "webpack/lib/dependencies/ConstDependency");
ConstDependency.Template = class ConstDependencyTemplate 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, templateContext) {
const dep = /** @type {ConstDependency} */ (dependency);
if (dep.runtimeRequirements) {
for (const req of dep.runtimeRequirements) {
templateContext.runtimeRequirements.add(req);
}
}
if (typeof dep.range === "number") {
source.insert(dep.range, dep.expression);
return;
}
source.replace(dep.range[0], dep.range[1] - 1, dep.expression);
}
};
module.exports = ConstDependency;

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