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) {
@@ -353,17 +358,21 @@ 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, filePath, exists: true };
 				},
-				() =>
-					// 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 { content: "", filePath, exists: false };
+				}
 			)
 		);
 
@@ -403,7 +412,7 @@ class DotenvPlugin {
 					}
 				}
 
-				callback(null, env, fileDependencies);
+				callback(null, env, fileDependencies, missingDependencies);
 			})
 			.catch((err) => {
 				callback(err);