chore: infra for units

packages/feature-flags-webpack-plugin/__tests__/__internal__/compiler.ts

@@ -0,0 +1,38 @@
+import path from 'path'
+import webpack from 'webpack'
+import { createFsFromVolume, Volume } from 'memfs'
+
+export function compiler(fixture: any, options: any = {}) {
+  const $compiler = webpack({
+    context: __dirname,
+    entry: `./${fixture}`,
+    output: {
+      path: path.resolve(__dirname),
+      filename: 'bundle.js',
+    },
+    module: {
+      rules: [
+        {
+          test: /\.txt$/,
+          use: {
+            loader: path.resolve(__dirname, '../src/loader.js'),
+            options,
+          },
+        },
+      ],
+    },
+    plugins: options.plugins,
+  })
+
+  $compiler.outputFileSystem = createFsFromVolume(new Volume())
+  $compiler.outputFileSystem.join = path.join.bind(path)
+
+  return new Promise((resolve, reject) => {
+    $compiler.run((err, stats) => {
+      if (err) reject(err)
+      if (stats.hasErrors()) reject(new Error(stats.toJson().errors))
+
+      resolve(stats)
+    })
+  })
+}

packages/feature-flags-webpack-plugin/__tests__/index.test.ts

@@ -0,0 +1,9 @@
+import FeatureFlagsWebpackPlugin from '../src/index'
+import { compiler } from './__internal__/compiler'
+
+test('yyy', async () => {
+  const plugin = new FeatureFlagsWebpackPlugin()
+  await compiler('', { plugins: [plugin] })
+
+  expect(1).toBe(1)
+})

packages/feature-flags-webpack-plugin/package.json

@@ -18,11 +18,13 @@
   "scripts": {
     "build": "tsc",
     "cleanup": "rm -rf lib",
+    "dev": "tsc -w",
     "prepublishOnly": "npm run cleanup && npm run build",
     "unit": "../../node_modules/.bin/jest --config ../../.config/jest/jest.config.js"
   },
   "devDependencies": {
-    "@types/webpack": "4.41.25",
-    "typescript": "4.1.3"
+    "memfs": "3.2.0",
+    "typescript": "4.1.3",
+    "webpack": "5.11.0"
   }
 }