fix(gulp-purgecss): fix support for stream input

jest.config.js

@@ -2,7 +2,7 @@ module.exports = {
   preset: "ts-jest",
   coverageDirectory: "coverage",
   coverageReporters: ["html", "lcov", "text"],
-  collectCoverageFrom: ["packages/*/src/**/*.ts"],
+  collectCoverageFrom: ["packages/*/src/**/*.ts", "!packages/grunt-purgecss/**/*.ts"],
   moduleFileExtensions: ["ts", "tsx", "js", "json"],
   moduleNameMapper: {
     "^purgecss$": "<rootDir>/packages/purgecss/src",

package.json

@@ -18,24 +18,24 @@
     "@rollup/plugin-json": "^4.1.0",
     "@types/jest": "^27.0.2",
     "@types/node": "^16.0.0",
-    "@typescript-eslint/eslint-plugin": "^5.3.0",
-    "@typescript-eslint/parser": "^5.3.0",
+    "@typescript-eslint/eslint-plugin": "^5.4.0",
+    "@typescript-eslint/parser": "^5.4.0",
     "@vuepress/plugin-google-analytics": "^1.8.2",
     "@vuepress/theme-default": "^1.8.2",
     "conventional-changelog-cli": "^2.1.1",
-    "eslint": "^8.2.0",
+    "eslint": "^8.3.0",
     "husky": "^7.0.1",
     "jest": "^27.3.1",
     "lerna": "^4.0.0",
-    "lint-staged": "^11.0.0",
-    "prettier": "^2.4.1",
-    "rollup": "^2.59.0",
+    "lint-staged": "^12.0.0",
+    "prettier": "^2.5.0",
+    "rollup": "^2.60.0",
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-terser": "^7.0.2",
-    "rollup-plugin-ts": "^1.4.0",
+    "rollup-plugin-ts": "^2.0.0",
     "ts-jest": "^27.0.7",
     "ts-node": "^10.4.0",
-    "typescript": "^4.4.4",
+    "typescript": "^4.5.2",
     "vuepress": "^1.8.2"
   },
   "scripts": {

packages/gulp-purgecss/__tests__/stream.test.ts

@@ -0,0 +1,50 @@
+import es from 'event-stream';
+import internal, { PassThrough } from "stream";
+import File from "vinyl";
+import gulpPurgecss from "../src/";
+
+describe("gulp-purgecss with stream", () => {
+  let myGulpPurgecss: internal.Transform;
+  let fileTest: File.StreamFile;
+  let fakeStream: internal.PassThrough;
+
+  beforeEach(() => {
+    fakeStream = new PassThrough();
+    fakeStream.write(Buffer.from(".unused, .used,"));
+    fakeStream.write(Buffer.from(" a { color:"));
+    fakeStream.write(Buffer.from(" blue; }"));
+    fakeStream.end();
+    fileTest = new File({
+      contents: fakeStream,
+    });
+    myGulpPurgecss = gulpPurgecss({
+      content: ["./packages/gulp-purgecss/__tests__/test.html"],
+    });
+  });
+
+//   it("returns a stream", (done) => {
+//     expect.assertions(1);
+//     myGulpPurgecss.write(fileTest);
+//     myGulpPurgecss.once("data", (file) => {
+//       expect(file.isStream()).toBe(true);
+//       done();
+//     });
+//   });
+
+  it("returns a purged css stream", (done) => {
+    expect.assertions(3);
+    myGulpPurgecss.write(fileTest);
+    myGulpPurgecss.on("data", (file: File.StreamFile) => {
+      file.contents.pipe(
+        es.wait((_err: any, data: string) => {
+          expect(data.includes("used")).toBe(true);
+          expect(data.includes("unused")).toBe(false);
+          expect(data.includes("a")).toBe(true);
+          done();
+        })
+      );
+    });
+    // myGulpPurgecss.on("end", done);
+  });
+
+});