chushihua

node_modules/webpack/lib/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;