fix(cli): fix cts support (#5575)

packages/rspack-cli/src/utils/isEsmFile.ts

@@ -5,6 +5,8 @@ const isEsmFile = (filePath: string, cwd = process.cwd()) => {
 	const ext = path.extname(filePath);
 	if (/\.(mjs|mts)$/.test(ext)) {
 		return true;
+	} else if (/\.(cjs|cts)/.test(ext)) {
+		return false;
 	} else {
 		const packageJson = readPackageUp(cwd);
 		return packageJson?.type === "module";

packages/rspack-cli/tests/build/config/cjs_in_esm/main.ts

@@ -0,0 +1 @@
+console.log("Main cjs file");

packages/rspack-cli/tests/build/config/cjs_in_esm/package.json

@@ -0,0 +1,3 @@
+{
+    "type": "module"
+}

packages/rspack-cli/tests/build/config/cjs_in_esm/rspack.config.cjs

@@ -0,0 +1,10 @@
+const path = require("path");
+
+module.exports = {
+	mode: "production",
+	entry: path.resolve(__dirname, "main.ts"),
+	output: {
+		path: path.resolve(__dirname, "dist"),
+		filename: "cjs.bundle.js"
+	}
+};

packages/rspack-cli/tests/build/config/cjs_in_esm/rspack.config.cts

@@ -0,0 +1,10 @@
+const path = require("path");
+
+module.exports = {
+	mode: "production",
+	entry: path.resolve(__dirname, "main.ts"),
+	output: {
+		path: path.resolve(__dirname, "dist"),
+		filename: "cts.bundle.js"
+	}
+};

packages/rspack-cli/tests/build/config/config.test.ts

@@ -9,7 +9,34 @@ describe("rspack cli", () => {
 			expect(stderr).toMatch(/not found/);
 		});
 	});
+	describe("should respect cjs in esm folder", () => {
+		const cwd = resolve(__dirname, "./cjs_in_esm");
+		it("should load config.cjs file", async () => {
+			const { exitCode, stderr, stdout } = await run(cwd, [
+				"-c",
+				"rspack.config.cjs"
+			]);
+			expect(stderr).toBeFalsy();
+			expect(stdout).toBeTruthy();
+			expect(exitCode).toBe(0);
+			expect(
+				readFile(resolve(cwd, "./dist/cjs.bundle.js"), { encoding: "utf-8" })
+			).resolves.toMatch(/Main cjs file/);
+		});
 
+		it("should load config.cts file", async () => {
+			const { exitCode, stderr, stdout } = await run(cwd, [
+				"-c",
+				"rspack.config.cts"
+			]);
+			expect(stderr).toBeFalsy();
+			expect(stdout).toBeTruthy();
+			expect(exitCode).toBe(0);
+			expect(
+				readFile(resolve(cwd, "./dist/cts.bundle.js"), { encoding: "utf-8" })
+			).resolves.toMatch(/Main cjs file/);
+		});
+	});
 	describe("should load cjs config", () => {
 		const cwd = resolve(__dirname, "./cjs");