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CachedConstDependency.js
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Sun, Feb 9, 22:29

CachedConstDependency.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Florent Cailhol @ooflorent
*/
"use strict";
const DependencyTemplate = require("../DependencyTemplate");
const InitFragment = require("../InitFragment");
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("../DependencyTemplates")} DependencyTemplates */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
/** @typedef {import("../util/Hash")} Hash */
class CachedConstDependency extends NullDependency {
constructor(expression, range, identifier) {
super();
this.expression = expression;
this.range = range;
this.identifier = identifier;
}
/**
* Update the hash
* @param {Hash} hash hash to be updated
* @param {UpdateHashContext} context context
* @returns {void}
*/
updateHash(hash, context) {
hash.update(this.identifier + "");
hash.update(this.range + "");
hash.update(this.expression + "");
}
serialize(context) {
const { write } = context;
write(this.expression);
write(this.range);
write(this.identifier);
super.serialize(context);
}
deserialize(context) {
const { read } = context;
this.expression = read();
this.range = read();
this.identifier = read();
super.deserialize(context);
}
}
makeSerializable(
CachedConstDependency,
"webpack/lib/dependencies/CachedConstDependency"
);
CachedConstDependency.Template = class CachedConstDependencyTemplate extends (
DependencyTemplate
) {
/**
* @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,
{ runtimeTemplate, dependencyTemplates, initFragments }
) {
const dep = /** @type {CachedConstDependency} */ (dependency);
initFragments.push(
new InitFragment(
`var ${dep.identifier} = ${dep.expression};\n`,
InitFragment.STAGE_CONSTANTS,
0,
`const ${dep.identifier}`
)
);
if (typeof dep.range === "number") {
source.insert(dep.range, dep.identifier);
return;
}
source.replace(dep.range[0], dep.range[1] - 1, dep.identifier);
}
};
module.exports = CachedConstDependency;

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