Method apply

lib/EnvironmentPlugin.js:42–72

* Applies the plugin by registering its hooks on the compiler. * @param {Compiler} compiler the compiler instance * @returns {void}

(compiler)

	 * @returns {void}
	 */
	apply(compiler) {
		const definePlugin = new DefinePlugin({});

		compiler.hooks.thisCompilation.tap(PLUGIN_NAME, (compilation) => {
			/** @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) {
					const error = new WebpackError(
						`${PLUGIN_NAME} - ${key} environment variable is undefined.\n\n` +
							class="st">"You can pass an object with default values to suppress this warning.\n" +
							class="st">"See https:class="cm">//webpack.js.org/plugins/environment-plugin for example."
					);

					error.name = class="st">"EnvVariableNotDefinedError";
					compilation.errors.push(error);
				}
				const defValue =
					value === undefined ? class="st">"undefined" : JSON.stringify(value);
				definitions[`process.env.${key}`] = defValue;
				definitions[`import.meta.env.${key}`] = defValue;
			}
			definePlugin.definitions = definitions;
		});
		definePlugin.apply(compiler);
	}
}

module.exports = EnvironmentPlugin;