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ContextReplacementPlugin.js
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Tue, Nov 12, 09:58

ContextReplacementPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const ContextElementDependency = require("./dependencies/ContextElementDependency");
const { join } = require("./util/fs");
class ContextReplacementPlugin {
constructor(
resourceRegExp,
newContentResource,
newContentRecursive,
newContentRegExp
) {
this.resourceRegExp = resourceRegExp;
if (typeof newContentResource === "function") {
this.newContentCallback = newContentResource;
} else if (
typeof newContentResource === "string" &&
typeof newContentRecursive === "object"
) {
this.newContentResource = newContentResource;
this.newContentCreateContextMap = (fs, callback) => {
callback(null, newContentRecursive);
};
} else if (
typeof newContentResource === "string" &&
typeof newContentRecursive === "function"
) {
this.newContentResource = newContentResource;
this.newContentCreateContextMap = newContentRecursive;
} else {
if (typeof newContentResource !== "string") {
newContentRegExp = newContentRecursive;
newContentRecursive = newContentResource;
newContentResource = undefined;
}
if (typeof newContentRecursive !== "boolean") {
newContentRegExp = newContentRecursive;
newContentRecursive = undefined;
}
this.newContentResource = newContentResource;
this.newContentRecursive = newContentRecursive;
this.newContentRegExp = newContentRegExp;
}
}
apply(compiler) {
const resourceRegExp = this.resourceRegExp;
const newContentCallback = this.newContentCallback;
const newContentResource = this.newContentResource;
const newContentRecursive = this.newContentRecursive;
const newContentRegExp = this.newContentRegExp;
const newContentCreateContextMap = this.newContentCreateContextMap;
compiler.hooks.contextModuleFactory.tap("ContextReplacementPlugin", cmf => {
cmf.hooks.beforeResolve.tap("ContextReplacementPlugin", result => {
if (!result) return;
if (resourceRegExp.test(result.request)) {
if (newContentResource !== undefined) {
result.request = newContentResource;
}
if (newContentRecursive !== undefined) {
result.recursive = newContentRecursive;
}
if (newContentRegExp !== undefined) {
result.regExp = newContentRegExp;
}
if (typeof newContentCallback === "function") {
newContentCallback(result);
} else {
for (const d of result.dependencies) {
if (d.critical) d.critical = false;
}
}
}
return result;
});
cmf.hooks.afterResolve.tap("ContextReplacementPlugin", result => {
if (!result) return;
if (resourceRegExp.test(result.resource)) {
if (newContentResource !== undefined) {
if (
newContentResource.startsWith("/") ||
(newContentResource.length > 1 && newContentResource[1] === ":")
) {
result.resource = newContentResource;
} else {
result.resource = join(
compiler.inputFileSystem,
result.resource,
newContentResource
);
}
}
if (newContentRecursive !== undefined) {
result.recursive = newContentRecursive;
}
if (newContentRegExp !== undefined) {
result.regExp = newContentRegExp;
}
if (typeof newContentCreateContextMap === "function") {
result.resolveDependencies = createResolveDependenciesFromContextMap(
newContentCreateContextMap
);
}
if (typeof newContentCallback === "function") {
const origResource = result.resource;
newContentCallback(result);
if (
result.resource !== origResource &&
!result.resource.startsWith("/") &&
(result.resource.length <= 1 || result.resource[1] !== ":")
) {
// When the function changed it to an relative path
result.resource = join(
compiler.inputFileSystem,
origResource,
result.resource
);
}
} else {
for (const d of result.dependencies) {
if (d.critical) d.critical = false;
}
}
}
return result;
});
});
}
}
const createResolveDependenciesFromContextMap = createContextMap => {
const resolveDependenciesFromContextMap = (fs, options, callback) => {
createContextMap(fs, (err, map) => {
if (err) return callback(err);
const dependencies = Object.keys(map).map(key => {
return new ContextElementDependency(
map[key] + options.resourceQuery + options.resourceFragment,
key,
options.category,
options.referencedExports
);
});
callback(null, dependencies);
});
};
return resolveDependenciesFromContextMap;
};
module.exports = ContextReplacementPlugin;

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