add missingDependencies

lib/DotenvPlugin.js

@@ -260,6 +260,8 @@ class DotenvPlugin {
 
 		/** @type {string[] | undefined} */
 		let fileDependenciesCache;
+		/** @type {string[] | undefined} */
+		let missingDependenciesCache;
 
 		compiler.hooks.beforeCompile.tapAsync(PLUGIN_NAME, (_params, callback) => {
 			const inputFileSystem = /** @type {InputFileSystem} */ (
@@ -272,7 +274,7 @@ class DotenvPlugin {
 				inputFileSystem,
 				mode,
 				context,
-				(err, env, fileDependencies) => {
+				(err, env, fileDependencies, missingDependencies) => {
 					if (err) return callback(err);
 
 					const definitions = envToDefinitions(env || {});
@@ -281,6 +283,8 @@ class DotenvPlugin {
 					definePlugin.definitions = definitions;
 					// update the file dependencies
 					fileDependenciesCache = fileDependencies;
+					// update the missing dependencies
+					missingDependenciesCache = missingDependencies;
 
 					callback();
 				}
@@ -289,6 +293,7 @@ class DotenvPlugin {
 
 		compiler.hooks.compilation.tap(PLUGIN_NAME, (compilation) => {
 			compilation.fileDependencies.addAll(fileDependenciesCache || []);
+			compilation.missingDependencies.addAll(missingDependenciesCache || []);
 		});
 
 		definePlugin.apply(compiler);
@@ -321,7 +326,7 @@ class DotenvPlugin {
 	 * @param {InputFileSystem} fs the input file system
 	 * @param {string | undefined} mode the mode
 	 * @param {string} context the compiler context
-	 * @param {(err: Error | null, env?: Record<string, string>, fileDependencies?: string[]) => void} callback callback function
+	 * @param {(err: Error | null, env?: Record<string, string>, fileDependencies?: string[], missingDependencies?: string[]) => void} callback callback function
 	 * @returns {void}
 	 */
 	loadEnv(fs, mode, context, callback) {
@@ -353,26 +358,30 @@ class DotenvPlugin {
 		const envFiles = this.getEnvFilesForMode(fs, dir, mode);
 		/** @type {string[]} */
 		const fileDependencies = [];
+		/** @type {string[]} */
+		const missingDependencies = [];
 
 		// Read all files
 		const readPromises = envFiles.map((filePath) =>
 			this.loadFile(fs, filePath).then(
 				(content) => {
 					fileDependencies.push(filePath);
-					return { content, filePath };
+					return content;
 				},
-				() =>
-					// File doesn't exist, skip it (this is normal)
-					({ content: "", filePath })
+				() => {
+					// File doesn't exist, add to missingDependencies (this is normal)
+					missingDependencies.push(filePath);
+					return "";
+				}
 			)
 		);
 
 		Promise.all(readPromises)
-			.then((results) => {
+			.then((contents) => {
 				// Parse all files and merge (later files override earlier ones)
 				// Similar to Vite's implementation
 				const parsed = /** @type {Record<string, string>} */ ({});
-				for (const { content } of results) {
+				for (const content of contents) {
 					if (!content) continue;
 					const entries = parse(content);
 					for (const key in entries) {
@@ -403,7 +412,7 @@ class DotenvPlugin {
 					}
 				}
 
-				callback(null, env, fileDependencies);
+				callback(null, env, fileDependencies, missingDependencies);
 			})
 			.catch((err) => {
 				callback(err);

test/watchCases/plugins/dotenv-plugin/2/index.js

@@ -5,4 +5,12 @@ it("should override .env values with .env.development in step 2", function () {
 	expect(process.env.WEBPACK_NEW_VAR).toBe("added-in-step-1");
 	// New variable from .env.development
 	expect(process.env.WEBPACK_DEV_ONLY).toBe("development-value");
+    // missingDependencies test
+	if (WATCH_STEP === "3") {
+		// In step 3, .env.myLocal from missingDependencies was created, so it has a value
+		expect(process.env.WEBPACK_MY_LOCAL).toBe("3");
+	} else {
+		// In step 2, .env.myLocal doesn't exist yet
+		expect(process.env.WEBPACK_MY_LOCAL).toBeUndefined();
+	}
 });

test/watchCases/plugins/dotenv-plugin/3/.env.myLocal

@@ -0,0 +1 @@
+WEBPACK_MY_LOCAL=3

test/watchCases/plugins/dotenv-plugin/webpack.config.js

@@ -1,6 +1,5 @@
 "use strict";
 
-const path = require("path");
 const DotenvPlugin = require("../../../../").DotenvPlugin;
 
 /** @type {(env: Env, options: TestOptions) => import("../../../../").Configuration} */
@@ -8,14 +7,14 @@ const DotenvPlugin = require("../../../../").DotenvPlugin;
 module.exports = (env, { srcPath, testPath }) => {
 	const dotenvPlugin = new DotenvPlugin({
 		prefix: "WEBPACK_",
-		dir: ""
+		dir: "",
+		template: [".env", ".env.myLocal", ".env.[mode]", ".env.[mode].myLocal"]
 	});
 	return {
 		mode: "development",
 		dotenv: false,
 		plugins: [
 			(compiler) => {
-				let i = 0;
 				// Update dotenvPlugin.config.dir before each compile
 				// Use beforeCompile with stage -1 to run before DotenvPlugin
 				compiler.hooks.beforeCompile.tap(
@@ -24,8 +23,7 @@ module.exports = (env, { srcPath, testPath }) => {
 						stage: -1
 					},
 					() => {
-						dotenvPlugin.config.dir = path.join(__dirname, String(i));
-						i++;
+						dotenvPlugin.config.dir = srcPath;
 					}
 				);
 			},

types.d.ts

@@ -4463,7 +4463,8 @@ declare class DotenvPlugin {
 		callback: (
 			err: null | Error,
 			env?: Record<string, string>,
-			fileDependencies?: string[]
+			fileDependencies?: string[],
+			missingDependencies?: string[]
 		) => void
 	): void;