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CommonJsSelfReferenceDependency.js
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Tue, Feb 4, 08:43

CommonJsSelfReferenceDependency.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const RuntimeGlobals = require("../RuntimeGlobals");
const { equals } = require("../util/ArrayHelpers");
const makeSerializable = require("../util/makeSerializable");
const propertyAccess = require("../util/propertyAccess");
const NullDependency = require("./NullDependency");
/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../Dependency").ExportsSpec} ExportsSpec */
/** @typedef {import("../Dependency").ReferencedExport} ReferencedExport */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */
class CommonJsSelfReferenceDependency extends NullDependency {
constructor(range, base, names, call) {
super();
this.range = range;
this.base = base;
this.names = names;
this.call = call;
}
get type() {
return "cjs self exports reference";
}
get category() {
return "self";
}
/**
* @returns {string | null} an identifier to merge equal requests
*/
getResourceIdentifier() {
return `self`;
}
/**
* Returns list of exports referenced by this dependency
* @param {ModuleGraph} moduleGraph module graph
* @param {RuntimeSpec} runtime the runtime for which the module is analysed
* @returns {(string[] | ReferencedExport)[]} referenced exports
*/
getReferencedExports(moduleGraph, runtime) {
return [this.call ? this.names.slice(0, -1) : this.names];
}
serialize(context) {
const { write } = context;
write(this.range);
write(this.base);
write(this.names);
write(this.call);
super.serialize(context);
}
deserialize(context) {
const { read } = context;
this.range = read();
this.base = read();
this.names = read();
this.call = read();
super.deserialize(context);
}
}
makeSerializable(
CommonJsSelfReferenceDependency,
"webpack/lib/dependencies/CommonJsSelfReferenceDependency"
);
CommonJsSelfReferenceDependency.Template = class CommonJsSelfReferenceDependencyTemplate 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,
{ module, moduleGraph, runtime, runtimeRequirements }
) {
const dep = /** @type {CommonJsSelfReferenceDependency} */ (dependency);
let used;
if (dep.names.length === 0) {
used = dep.names;
} else {
used = moduleGraph.getExportsInfo(module).getUsedName(dep.names, runtime);
}
if (!used) {
throw new Error(
"Self-reference dependency has unused export name: This should not happen"
);
}
let base = undefined;
switch (dep.base) {
case "exports":
runtimeRequirements.add(RuntimeGlobals.exports);
base = module.exportsArgument;
break;
case "module.exports":
runtimeRequirements.add(RuntimeGlobals.module);
base = `${module.moduleArgument}.exports`;
break;
case "this":
runtimeRequirements.add(RuntimeGlobals.thisAsExports);
base = "this";
break;
default:
throw new Error(`Unsupported base ${dep.base}`);
}
if (base === dep.base && equals(used, dep.names)) {
// Nothing has to be changed
// We don't use a replacement for compat reasons
// for plugins that update `module._source` which they
// shouldn't do!
return;
}
source.replace(
dep.range[0],
dep.range[1] - 1,
`${base}${propertyAccess(used)}`
);
}
};
module.exports = CommonJsSelfReferenceDependency;

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