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 needsEnvVarFix = ["8", "9"].indexOf(process.versions.node.split(".")[0]) >= 0 &&
process.platform === "win32";
class EnvironmentPlugin {
constructor(keys) {
if(Array.isArray(keys)) {
this.keys = keys;
this.defaultValues = {};
} else if(keys && typeof keys === "object") {
this.keys = Object.keys(keys);
this.defaultValues = keys;
} else {
this.keys = Array.prototype.slice.call(arguments);
this.defaultValues = {};
}
}
apply(compiler) {
const definitions = this.keys.reduce((defs, key) => {
// TODO remove once the fix has made its way into Node 8.
// Work around https://github.com/nodejs/node/pull/18463,
// affecting Node 8 & 9 by performing an OS-level
// operation that always succeeds before reading
// environment variables:
if(needsEnvVarFix) require("os").cpus();
const value = process.env[key] !== undefined ? process.env[key] : this.defaultValues[key];
if(value === undefined) {
compiler.plugin("this-compilation", compilation => {
const error = new Error(
`EnvironmentPlugin - ${key} environment variable is undefined.\n\n` +
"You can pass an object with default values to suppress this warning.\n" +
"See https://webpack.js.org/plugins/environment-plugin for example."
);
error.name = "EnvVariableNotDefinedError";
compilation.warnings.push(error);
});
}
defs[`process.env.${key}`] = typeof value === "undefined" ? "undefined" : JSON.stringify(value);
return defs;
}, {});
compiler.apply(new DefinePlugin(definitions));
}
}
module.exports = EnvironmentPlugin;