chore: add test showing dart-sass @use

Author: skovy

__tests__/dart-sass/dart-sass.test.ts

@@ -0,0 +1,63 @@
+import fs from "fs";
+import path from "path";
+import slash from "slash";
+
+import { alerts } from "../../lib/core";
+import { main } from "../../lib/main";
+
+describe("dart-sass", () => {
+  let writeFileSyncSpy: jest.SpyInstance;
+
+  beforeEach(() => {
+    // Only mock the writes, so the example files can still be read.
+    writeFileSyncSpy = jest.spyOn(fs, "writeFileSync").mockImplementation();
+
+    // Avoid creating directories while running tests.
+    jest.spyOn(fs, "mkdirSync").mockImplementation();
+
+    // Avoid console logs showing up.
+    jest.spyOn(console, "log").mockImplementation();
+
+    jest.spyOn(alerts, "error").mockImplementation();
+  });
+
+  afterEach(() => {
+    writeFileSyncSpy.mockReset();
+  });
+
+  test("@use support", async () => {
+    const pattern = `${__dirname}`;
+
+    await main(pattern, {
+      banner: "",
+      watch: false,
+      ignoreInitial: false,
+      exportType: "named",
+      exportTypeName: "ClassNames",
+      exportTypeInterface: "Styles",
+      listDifferent: false,
+      ignore: [],
+      implementation: "sass",
+      quoteType: "single",
+      updateStaleOnly: false,
+      logLevel: "verbose",
+      additionalData: "$global-red: red;",
+      aliases: {
+        "~fancy-import": "complex",
+        "~another": "style",
+      },
+      aliasPrefixes: {
+        "~": "nested-styles/",
+      },
+    });
+
+    expect(alerts.error).not.toHaveBeenCalled();
+    expect(fs.writeFileSync).toBeCalledTimes(1);
+
+    const expectedDirname = slash(__dirname);
+    expect(fs.writeFileSync).toBeCalledWith(
+      `${expectedDirname}/use.scss.d.ts`,
+      "export declare const foo: string;\n"
+    );
+  });
+});

__tests__/dart-sass/use.scss

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+@use "variables";
+
+.foo {
+  color: variables.$red;
+}

__tests__/dart-sass/variables.scss

@@ -0,0 +1 @@
+$red: red;