test: add simple test

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 *.log
-dist
+dist
+.cache

.prettierrc

@@ -0,0 +1,4 @@
+{
+  "singleQuote": true,
+  "semi": false
+}

jest.config.js

@@ -0,0 +1,9 @@
+module.exports = {
+  testEnvironment: 'node',
+  transform: {
+    '^.+\\.tsx?$': 'ts-jest'
+  },
+  testRegex: '(/__test__/.*|(\\.|/)(test|spec))\\.tsx?$',
+  testPathIgnorePatterns: ['/node_modules/', '/dist/', '/types/'],
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node']
+}

package.json

@@ -10,20 +10,28 @@
   "license": "MIT",
   "scripts": {
     "build": "esbuild src/cli.ts --platform=node --outdir=dist --format=cjs --target=es2018 --external:rollup --external:rollup-plugin-esbuild --bundle",
-    "prepublishOnly": "npm run build"
+    "prepublishOnly": "npm run build",
+    "test": "npm run build && jest"
   },
   "dependencies": {
     "rollup": "^2.8.2",
     "rollup-plugin-esbuild": "^1.3.1"
   },
   "devDependencies": {
     "@rollup/plugin-commonjs": "^11.1.0",
+    "@types/fs-extra": "^8.1.0",
+    "@types/jest": "^25.2.1",
     "@types/node": "^13.9.2",
     "@types/resolve": "^1.17.0",
     "cac": "^6.5.8",
     "colorette": "^1.1.0",
+    "execa": "^4.0.1",
+    "fs-extra": "^9.0.0",
+    "jest": "^26.0.1",
+    "prettier": "^2.0.5",
     "resolve": "^1.17.0",
     "rollup-plugin-hashbang": "^2.2.2",
+    "ts-jest": "^25.5.1",
     "typescript": "^3.8.3"
   }
 }

test/index.test.ts

@@ -0,0 +1,39 @@
+import { join } from 'path'
+import execa from 'execa'
+import fs from 'fs-extra'
+
+const cacheDir = join(__dirname, '.cache')
+const bin = join(__dirname, '../dist/cli.js')
+
+beforeAll(async () => {
+  await fs.remove(cacheDir)
+})
+
+function runTest(title: string, files: { [name: string]: string }) {
+  const testDir = join(cacheDir, title)
+  test(title, async () => {
+    await Promise.all(
+      Object.keys(files).map((name) => {
+        return fs.outputFile(join(testDir, name), files[name], 'utf8')
+      })
+    )
+    const { exitCode } = await execa(bin, ['input.js'], {
+      cwd: testDir,
+    })
+    expect(exitCode).toBe(0)
+    const output = await fs.readFile(join(testDir, 'dist/input.js'), 'utf8')
+    expect(output).toMatchInlineSnapshot(`
+      "'use strict';
+
+      var foo2 = \\"foo\\";
+
+      module.exports = foo2;
+      "
+    `)
+  })
+}
+
+runTest('simple', {
+  'input.js': `import foo from './foo';export default foo`,
+  'foo.js': `export default 'foo'`,
+})

tsconfig.json

@@ -0,0 +1,66 @@
+{
+  "compilerOptions": {
+    /* Basic Options */
+    // "incremental": true,                   /* Enable incremental compilation */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
+    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
+    // "lib": [],                             /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    // "outDir": "./",                        /* Redirect output structure to the directory. */
+    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                     /* Enable project compilation */
+    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                           /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+
+    /* Advanced Options */
+    "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
+  }
+}