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ProvidePlugin.js
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Fri, Jul 4, 02:17

ProvidePlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const ConstDependency = require("./dependencies/ConstDependency");
const ProvidedDependency = require("./dependencies/ProvidedDependency");
const { approve } = require("./javascript/JavascriptParserHelpers");
/** @typedef {import("./Compiler")} Compiler */
class ProvidePlugin {
/**
* @param {Record<string, string | string[]>} definitions the provided identifiers
*/
constructor(definitions) {
this.definitions = definitions;
}
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
const definitions = this.definitions;
compiler.hooks.compilation.tap(
"ProvidePlugin",
(compilation, { normalModuleFactory }) => {
compilation.dependencyTemplates.set(
ConstDependency,
new ConstDependency.Template()
);
compilation.dependencyFactories.set(
ProvidedDependency,
normalModuleFactory
);
compilation.dependencyTemplates.set(
ProvidedDependency,
new ProvidedDependency.Template()
);
const handler = (parser, parserOptions) => {
Object.keys(definitions).forEach(name => {
const request = [].concat(definitions[name]);
const splittedName = name.split(".");
if (splittedName.length > 0) {
splittedName.slice(1).forEach((_, i) => {
const name = splittedName.slice(0, i + 1).join(".");
parser.hooks.canRename.for(name).tap("ProvidePlugin", approve);
});
}
parser.hooks.expression.for(name).tap("ProvidePlugin", expr => {
const nameIdentifier = name.includes(".")
? `__webpack_provided_${name.replace(/\./g, "_dot_")}`
: name;
const dep = new ProvidedDependency(
request[0],
nameIdentifier,
request.slice(1),
expr.range
);
dep.loc = expr.loc;
parser.state.module.addDependency(dep);
return true;
});
parser.hooks.call.for(name).tap("ProvidePlugin", expr => {
const nameIdentifier = name.includes(".")
? `__webpack_provided_${name.replace(/\./g, "_dot_")}`
: name;
const dep = new ProvidedDependency(
request[0],
nameIdentifier,
request.slice(1),
expr.callee.range
);
dep.loc = expr.callee.loc;
parser.state.module.addDependency(dep);
parser.walkExpressions(expr.arguments);
return true;
});
});
};
normalModuleFactory.hooks.parser
.for("javascript/auto")
.tap("ProvidePlugin", handler);
normalModuleFactory.hooks.parser
.for("javascript/dynamic")
.tap("ProvidePlugin", handler);
normalModuleFactory.hooks.parser
.for("javascript/esm")
.tap("ProvidePlugin", handler);
}
);
}
}
module.exports = ProvidePlugin;

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