mirror of https://github.com/webpack/webpack.git
73 lines
2.0 KiB
JavaScript
73 lines
2.0 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Authors Simen Brekken @simenbrekken, Einar Löve @einarlove
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*/
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"use strict";
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/** @typedef {import("./Compiler")} Compiler */
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const WebpackError = require("./WebpackError");
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const DefinePlugin = require("./DefinePlugin");
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const needsEnvVarFix =
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["8", "9"].indexOf(process.versions.node.split(".")[0]) >= 0 &&
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process.platform === "win32";
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class EnvironmentPlugin {
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constructor(...keys) {
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if (keys.length === 1 && Array.isArray(keys[0])) {
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this.keys = keys[0];
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this.defaultValues = {};
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} else if (keys.length === 1 && keys[0] && typeof keys[0] === "object") {
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this.keys = Object.keys(keys[0]);
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this.defaultValues = keys[0];
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} else {
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this.keys = keys;
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this.defaultValues = {};
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}
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}
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/**
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* @param {Compiler} compiler webpack compiler instance
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* @returns {void}
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*/
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apply(compiler) {
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const definitions = this.keys.reduce((defs, key) => {
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// TODO remove once the fix has made its way into Node 8.
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// Work around https://github.com/nodejs/node/pull/18463,
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// affecting Node 8 & 9 by performing an OS-level
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// operation that always succeeds before reading
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// environment variables:
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if (needsEnvVarFix) require("os").cpus();
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const value =
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process.env[key] !== undefined
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? process.env[key]
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: this.defaultValues[key];
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if (value === undefined) {
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compiler.hooks.thisCompilation.tap("EnvironmentPlugin", compilation => {
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const error = new WebpackError(
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`EnvironmentPlugin - ${key} environment variable is undefined.\n\n` +
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"You can pass an object with default values to suppress this warning.\n" +
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"See https://webpack.js.org/plugins/environment-plugin for example."
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);
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error.name = "EnvVariableNotDefinedError";
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compilation.warnings.push(error);
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});
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}
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defs[`process.env.${key}`] =
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value === undefined ? "undefined" : JSON.stringify(value);
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return defs;
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}, {});
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new DefinePlugin(definitions).apply(compiler);
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}
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}
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module.exports = EnvironmentPlugin;
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