test: rewrite the tests in jest/typescript

Author: aminya

__tests__/index.test.js __tests__/index.test.ts__tests__/index.test.js renamed to __tests__/index.test.ts

@@ -1,49 +1,55 @@
-const { requireFresh } = require("requirefresh")
-const path = require("path")
+import { requireFresh } from "requirefresh"
+import assert from "assert"
+import * as path from "path"
 
-const terserFile = path.join(path.dirname(__dirname), "src", ".terserrc.js")
+type Terserrc = typeof import("../src/.terserrc")
+function requireTerserrc(): Terserrc {
+  return requireFresh(path.join(path.dirname(__dirname), "src", ".terserrc.js"))
+}
 
 describe("Terser-Config-Atomic", () => {
   it("production", () => {
     process.env.NODE_ENV = "production"
 
-    const TerserOptions = requireFresh(terserFile)
+    const TerserOptions = requireTerserrc()
 
     expect(typeof TerserOptions).toBe("object")
+    assert(typeof TerserOptions.compress === "object")
     expect(TerserOptions.compress.global_defs).toEqual({
       "process.env.NODE_ENV": "production",
       "process.env.BABEL_ENV": "production",
       "@atom.inSpecMode": "() => false",
       "@atom.inDevMode": "() => false",
     })
     expect(TerserOptions.compress.passes).toBe(3)
-    expect(TerserOptions.mangle).toBeTrue()
-    expect(TerserOptions.format.beautify).toBeFalse()
+    expect(TerserOptions.mangle).toBe(true)
+    expect(TerserOptions.format.beautify).toBe(false)
   })
   it("development", () => {
     process.env.NODE_ENV = "development"
 
-    const TerserOptions = requireFresh(terserFile)
+    const TerserOptions = requireTerserrc()
 
     expect(typeof TerserOptions).toBe("object")
-    expect(TerserOptions.compress).toBeFalse()
-    expect(TerserOptions.mangle).toBeFalse()
-    expect(TerserOptions.format.beautify).toBeTrue()
+    expect(TerserOptions.compress).toBe(false)
+    expect(TerserOptions.mangle).toBe(false)
+    expect(TerserOptions.format.beautify).toBe(true)
   })
   it("test", () => {
     process.env.NODE_ENV = "test"
 
-    const TerserOptions = requireFresh(terserFile)
+    const TerserOptions = requireTerserrc()
 
     expect(typeof TerserOptions).toBe("object")
+    assert(typeof TerserOptions.compress === "object")
     expect(TerserOptions.compress.global_defs).toEqual({
       "process.env.NODE_ENV": "test",
       "process.env.BABEL_ENV": "test",
       "@atom.inSpecMode": "() => true",
       "@atom.inDevMode": "() => false",
     })
     expect(TerserOptions.compress.passes).toBe(3)
-    expect(TerserOptions.mangle).toBeFalse()
-    expect(TerserOptions.format.beautify).toBeTrue()
+    expect(TerserOptions.mangle).toBe(false)
+    expect(TerserOptions.format.beautify).toBe(true)
   })
 })

jest.config.ts

@@ -1,22 +1,17 @@
-/**
- * For a detailed explanation regarding each configuration property, visit:
- * https://jestjs.io/docs/configuration
- */
-
 import type { Config } from "jest"
 
-const config: Config = {
-  // Automatically clear mock calls, instances, contexts and results before every test
-  clearMocks: true,
-
-  // Indicates whether the coverage information should be collected while executing the test
-  collectCoverage: true,
-
-  // The directory where Jest should output its coverage files
-  coverageDirectory: "coverage",
-
-  // Indicates which provider should be used to instrument code for coverage
-  coverageProvider: "v8",
+const jestConfig: Config = {
+  testMatch: ["**/*.test.ts"],
+  testEnvironment: "node",
+  extensionsToTreatAsEsm: [".ts", ".tsx", ".jsx"],
+  transformIgnorePatterns: [], // transform node_modules
+  transform: {
+    "^.+\\.(t|j)sx?$": "@swc/jest",
+  },
+  // coverage
+  collectCoverageFrom: ["src/**/*.{ts,tsx,js,jsx}"],
+  coveragePathIgnorePatterns: ["assets", ".css.d.ts"],
+  verbose: true,
 }
 
-export default config
+export default jestConfig

package.json

@@ -25,6 +25,8 @@
   },
   "atomTestRunner": "./test/runner",
   "devDependencies": {
+    "@swc/jest": "^0.2.29",
+    "@types/jest": "^29.5.4",
     "eslint": "^8.48.0",
     "eslint-config-atomic": "^1.19.3",
     "jest": "^29.6.4",