add watch test

lib/DotenvPlugin.js

@@ -6,7 +6,7 @@
 "use strict";
 
 const createSchemaValidation = require("./util/create-schema-validation");
-const { join } = require("./util/fs");
+const { isAbsolute, join } = require("./util/fs");
 
 /** @typedef {import("../declarations/WebpackOptions").DotenvPluginOptions} DotenvPluginOptions */
 /** @typedef {import("./Compiler")} Compiler */
@@ -336,6 +336,9 @@ class DotenvPlugin {
 		}
 		const getDir = () => {
 			if (typeof rawDir === "string") {
+				if (isAbsolute(rawDir)) {
+					return rawDir;
+				}
 				return join(fs, context, rawDir);
 			}
 			if (rawDir === true) {

test/watchCases/plugins/dotenv-plugin/0/.env

@@ -0,0 +1,2 @@
+WEBPACK_API_URL=https://api0.example.com
+WEBPACK_FEATURE_FLAG=false

test/watchCases/plugins/dotenv-plugin/0/index.js

@@ -0,0 +1,5 @@
+it("should load env variables from .env file in step 0", function () {
+	expect(process.env.WEBPACK_API_URL).toBe("https://api0.example.com");
+	expect(process.env.WEBPACK_FEATURE_FLAG).toBe("false");
+	expect(process.env.WEBPACK_NEW_VAR).toBeUndefined();
+});

test/watchCases/plugins/dotenv-plugin/1/.env

@@ -0,0 +1,3 @@
+WEBPACK_API_URL=https://api1.example.com
+WEBPACK_FEATURE_FLAG=false
+WEBPACK_NEW_VAR=added-in-step-1

test/watchCases/plugins/dotenv-plugin/1/index.js

@@ -0,0 +1,5 @@
+it("should load new variable added to .env file in step 1", function () {
+	expect(process.env.WEBPACK_API_URL).toBe("https://api1.example.com");
+	expect(process.env.WEBPACK_FEATURE_FLAG).toBe("false");
+	expect(process.env.WEBPACK_NEW_VAR).toBe("added-in-step-1");
+});

test/watchCases/plugins/dotenv-plugin/2/.env

@@ -0,0 +1,3 @@
+WEBPACK_API_URL=https://api2.example.com
+WEBPACK_FEATURE_FLAG=false
+WEBPACK_NEW_VAR=added-in-step-1

test/watchCases/plugins/dotenv-plugin/2/.env.development

@@ -0,0 +1,2 @@
+WEBPACK_FEATURE_FLAG=true
+WEBPACK_DEV_ONLY=development-value

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

@@ -0,0 +1,8 @@
+it("should override .env values with .env.development in step 2", function () {
+	expect(process.env.WEBPACK_API_URL).toBe("https://api2.example.com");
+	// WEBPACK_FEATURE_FLAG should be overridden by .env.development
+	expect(process.env.WEBPACK_FEATURE_FLAG).toBe("true");
+	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");
+});

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

@@ -0,0 +1,35 @@
+"use strict";
+
+const path = require("path");
+const DotenvPlugin = require("../../../../").DotenvPlugin;
+
+/** @type {(env: Env, options: TestOptions) => import("../../../../").Configuration} */
+
+module.exports = (env, { srcPath, testPath }) => {
+	const dotenvPlugin = new DotenvPlugin({
+		prefix: "WEBPACK_",
+		dir: ""
+	});
+	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(
+					{
+						name: "UpdateDotenvDir",
+						stage: -1
+					},
+					() => {
+						dotenvPlugin.config.dir = path.join(__dirname, String(i));
+						i++;
+					}
+				);
+			},
+			dotenvPlugin
+		]
+	};
+};