test: add test case

declarations/LoaderContext.d.ts

@@ -187,6 +187,7 @@ export interface LoaderRunnerLoaderContext<OptionsType> {
 		data: object | undefined;
 		pitchExecuted: boolean;
 		normalExecuted: boolean;
+		type?: "commonjs" | "module" | undefined;
 	}[];
 
 	/**

test/cases/loaders/package-type/index.js

@@ -0,0 +1,17 @@
+it("should pass package.json type to loader", function (done) {
+	expect(require("cjs/loader.js!")).toBe("commonjs");
+	expect(require("esm/loader.js!")).toBe("module");
+	expect(require("./loader.js!")).toBe("undefined");
+});
+
+it("should pass 'commonjs' type to loader for .cjs", function () {
+	expect(require("cjs/loader.cjs!")).toBe("commonjs");
+	expect(require("esm/loader.cjs!")).toBe("commonjs");
+	expect(require("./loader.cjs!")).toBe("commonjs");
+});
+
+it("should pass 'module' type to loader for .mjs", function () {
+	expect(require("cjs/loader.mjs!")).toBe("module");
+	expect(require("esm/loader.mjs!")).toBe("module");
+	expect(require("./loader.mjs!")).toBe("module");
+});

test/cases/loaders/package-type/loader.cjs

@@ -0,0 +1,4 @@
+/** @type {import("../../../../").LoaderDefinition} */
+module.exports = function loader() {
+	return `module.exports = "${this.loaders[this.loaderIndex].type}";`;
+};

test/cases/loaders/package-type/loader.js

@@ -0,0 +1,4 @@
+/** @type {import("../../../../").LoaderDefinition} */
+module.exports = function loader() {
+	return `module.exports = "${this.loaders[this.loaderIndex].type}";`;
+};

test/cases/loaders/package-type/loader.mjs

@@ -0,0 +1,4 @@
+/** @type {import("../../../../").LoaderDefinition} */
+export default function loader() {
+	return `export default "${this.loaders[this.loaderIndex].type}";`;
+}

types.d.ts

@@ -6297,6 +6297,7 @@ declare interface LoaderRunnerLoaderContext<OptionsType> {
 		data?: object;
 		pitchExecuted: boolean;
 		normalExecuted: boolean;
+		type?: "module" | "commonjs";
 	}[];
 
 	/**