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CommonJsExportsDependency.js
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Fri, Jul 4, 16:24

CommonJsExportsDependency.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const InitFragment = require("../InitFragment");
const makeSerializable = require("../util/makeSerializable");
const propertyAccess = require("../util/propertyAccess");
const { handleDependencyBase } = require("./CommonJsDependencyHelpers");
const NullDependency = require("./NullDependency");
/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../Dependency").ExportsSpec} ExportsSpec */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
const EMPTY_OBJECT = {};
class CommonJsExportsDependency extends NullDependency {
constructor(range, valueRange, base, names) {
super();
this.range = range;
this.valueRange = valueRange;
this.base = base;
this.names = names;
}
get type() {
return "cjs exports";
}
/**
* Returns the exported names
* @param {ModuleGraph} moduleGraph module graph
* @returns {ExportsSpec | undefined} export names
*/
getExports(moduleGraph) {
const name = this.names[0];
return {
exports: [
{
name,
// we can't mangle names that are in an empty object
// because one could access the prototype property
// when export isn't set yet
canMangle: !(name in EMPTY_OBJECT)
}
],
dependencies: undefined
};
}
serialize(context) {
const { write } = context;
write(this.range);
write(this.valueRange);
write(this.base);
write(this.names);
super.serialize(context);
}
deserialize(context) {
const { read } = context;
this.range = read();
this.valueRange = read();
this.base = read();
this.names = read();
super.deserialize(context);
}
}
makeSerializable(
CommonJsExportsDependency,
"webpack/lib/dependencies/CommonJsExportsDependency"
);
CommonJsExportsDependency.Template = class CommonJsExportsDependencyTemplate 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, initFragments, runtimeRequirements, runtime }
) {
const dep = /** @type {CommonJsExportsDependency} */ (dependency);
const used = moduleGraph
.getExportsInfo(module)
.getUsedName(dep.names, runtime);
const [type, base] = handleDependencyBase(
dep.base,
module,
runtimeRequirements
);
switch (type) {
case "expression":
if (!used) {
initFragments.push(
new InitFragment(
"var __webpack_unused_export__;\n",
InitFragment.STAGE_CONSTANTS,
0,
"__webpack_unused_export__"
)
);
source.replace(
dep.range[0],
dep.range[1] - 1,
"__webpack_unused_export__"
);
return;
}
source.replace(
dep.range[0],
dep.range[1] - 1,
`${base}${propertyAccess(used)}`
);
return;
case "Object.defineProperty":
if (!used) {
initFragments.push(
new InitFragment(
"var __webpack_unused_export__;\n",
InitFragment.STAGE_CONSTANTS,
0,
"__webpack_unused_export__"
)
);
source.replace(
dep.range[0],
dep.valueRange[0] - 1,
"__webpack_unused_export__ = ("
);
source.replace(dep.valueRange[1], dep.range[1] - 1, ")");
return;
}
source.replace(
dep.range[0],
dep.valueRange[0] - 1,
`Object.defineProperty(${base}${propertyAccess(
used.slice(0, -1)
)}, ${JSON.stringify(used[used.length - 1])}, (`
);
source.replace(dep.valueRange[1], dep.range[1] - 1, "))");
return;
}
}
};
module.exports = CommonJsExportsDependency;

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