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EnvironmentPlugin.js
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Wed, Nov 6, 19:29

EnvironmentPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Authors Simen Brekken @simenbrekken, Einar Löve @einarlove
*/
"use strict";
const DefinePlugin = require("./DefinePlugin");
const WebpackError = require("./WebpackError");
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./DefinePlugin").CodeValue} CodeValue */
class EnvironmentPlugin {
constructor(...keys) {
if (keys.length === 1 && Array.isArray(keys[0])) {
this.keys = keys[0];
this.defaultValues = {};
} else if (keys.length === 1 && keys[0] && typeof keys[0] === "object") {
this.keys = Object.keys(keys[0]);
this.defaultValues = keys[0];
} else {
this.keys = keys;
this.defaultValues = {};
}
}
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
/** @type {Record<string, CodeValue>} */
const definitions = {};
for (const key of this.keys) {
const value =
process.env[key] !== undefined
? process.env[key]
: this.defaultValues[key];
if (value === undefined) {
compiler.hooks.thisCompilation.tap("EnvironmentPlugin", compilation => {
const error = new WebpackError(
`EnvironmentPlugin - ${key} environment variable is undefined.\n\n` +
"You can pass an object with default values to suppress this warning.\n" +
"See https://webpack.js.org/plugins/environment-plugin for example."
);
error.name = "EnvVariableNotDefinedError";
compilation.errors.push(error);
});
}
definitions[`process.env.${key}`] =
value === undefined ? "undefined" : JSON.stringify(value);
}
new DefinePlugin(definitions).apply(compiler);
}
}
module.exports = EnvironmentPlugin;

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