switch to ESM and update config/test wiring

.prettierrc.json

@@ -6,6 +6,5 @@
   "singleQuote": true,
   "trailingComma": "none",
   "bracketSpacing": false,
-  "arrowParens": "avoid",
-  "parser": "typescript"
+  "arrowParens": "avoid"
 }

__tests__/context.test.ts

@@ -1,8 +1,8 @@
-import {beforeEach, describe, expect, test} from '@jest/globals';
+import {beforeEach, describe, expect, test} from 'vitest';
 import * as os from 'os';
 import * as path from 'path';
 
-import * as context from '../src/context';
+import * as context from '../src/context.js';
 
 describe('getInputs', () => {
   beforeEach(() => {
@@ -15,7 +15,7 @@ describe('getInputs', () => {
   });
 
   // prettier-ignore
-  test.each([
+  const cases: [number, Map<string, string>, context.Inputs][] = [
     [
       0,
       new Map<string, string>([
@@ -35,7 +35,7 @@ describe('getInputs', () => {
         setHost: false,
         runtimeBasedir: path.join(os.homedir(), `setup-docker-action`),
         githubToken: '',
-      } as context.Inputs
+      }
     ],
     [
       1,
@@ -59,7 +59,7 @@ describe('getInputs', () => {
         setHost: false,
         runtimeBasedir: path.join(os.homedir(), `setup-docker-action`),
         githubToken: '',
-      } as context.Inputs
+      }
     ],
     [
       2,
@@ -79,7 +79,7 @@ describe('getInputs', () => {
         setHost: true,
         runtimeBasedir: path.join(os.homedir(), `setup-docker-action`),
         githubToken: '',
-      } as context.Inputs
+      }
     ],
     [
     3,
@@ -101,7 +101,7 @@ describe('getInputs', () => {
         setHost: false,
         runtimeBasedir: path.join(os.homedir(), `setup-docker-action`),
         githubToken: '',
-      } as context.Inputs
+      }
     ],
     [
       4,
@@ -121,7 +121,7 @@ describe('getInputs', () => {
         setHost: false,
         runtimeBasedir: path.join(os.homedir(), `setup-docker-action`),
         githubToken: '',
-      } as context.Inputs
+      }
     ],
     [
       5,
@@ -142,7 +142,7 @@ describe('getInputs', () => {
         rootless: false,
         runtimeBasedir: path.join(os.homedir(), `setup-docker-action`),
         githubToken: '',
-      } as context.Inputs
+      }
     ],
     [
       6,
@@ -163,7 +163,7 @@ describe('getInputs', () => {
         rootless: false,
         runtimeBasedir: path.join(os.homedir(), `setup-docker-action`),
         githubToken: '',
-      } as context.Inputs
+      }
     ],
     [
       7,
@@ -183,7 +183,7 @@ describe('getInputs', () => {
         rootless: false,
         runtimeBasedir: path.join(os.homedir(), `setup-docker-action`),
         githubToken: '',
-      } as context.Inputs
+      }
     ],
     [
       8,
@@ -203,7 +203,7 @@ describe('getInputs', () => {
         rootless: true,
         runtimeBasedir: path.join(os.homedir(), `setup-docker-action`),
         githubToken: '',
-      } as context.Inputs
+      }
     ],
     [
       9,
@@ -226,10 +226,11 @@ describe('getInputs', () => {
         setHost: false,
         runtimeBasedir: path.join(os.homedir(), `setup-docker-action`),
         githubToken: '',
-      } as context.Inputs
+      }
     ],
-  ])(
-    '[%d] given %p as inputs, returns %p',
+  ];
+  test.each(cases)(
+    '[%d] given %o as inputs, returns %o',
     async (num: number, inputs: Map<string, string>, expected: context.Inputs) => {
       inputs.forEach((value: string, name: string) => {
         setInput(name, value);

__tests__/setup.unit.ts

@@ -0,0 +1,12 @@
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+
+const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'docker-setup-docker-action-'));
+
+process.env = Object.assign({}, process.env, {
+  TEMP: tmpDir,
+  GITHUB_REPOSITORY: 'docker/setup-docker-action',
+  RUNNER_TEMP: path.join(tmpDir, 'runner-temp'),
+  RUNNER_TOOL_CACHE: path.join(tmpDir, 'runner-tool-cache')
+});

dev.Dockerfile

@@ -74,7 +74,7 @@ FROM deps AS test
 RUN --mount=type=bind,target=.,rw \
   --mount=type=cache,target=/src/.yarn/cache \
   --mount=type=cache,target=/src/node_modules \
-  yarn run test --coverage --coverageDirectory=/tmp/coverage
+  yarn run test --coverage --coverage.reportsDirectory=/tmp/coverage
 
 FROM scratch AS test-coverage
 COPY --from=test /tmp/coverage /

eslint.config.mjs

@@ -0,0 +1,52 @@
+import {defineConfig} from 'eslint/config';
+import js from '@eslint/js';
+import tseslint from '@typescript-eslint/eslint-plugin';
+import vitest from '@vitest/eslint-plugin';
+import globals from 'globals';
+import eslintConfigPrettier from 'eslint-config-prettier/flat';
+import eslintPluginPrettier from 'eslint-plugin-prettier';
+
+export default defineConfig([
+  {
+    ignores: ['.yarn/**/*', 'coverage/**/*', 'dist/**/*']
+  },
+  js.configs.recommended,
+  ...tseslint.configs['flat/recommended'],
+  eslintConfigPrettier,
+  {
+    languageOptions: {
+      globals: {
+        ...globals.node
+      }
+    }
+  },
+  {
+    files: ['__tests__/**'],
+    ...vitest.configs.recommended,
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...vitest.environments.env.globals
+      }
+    },
+    rules: {
+      ...vitest.configs.recommended.rules,
+      'vitest/no-conditional-expect': 'error',
+      'vitest/no-disabled-tests': 0
+    }
+  },
+  {
+    plugins: {
+      prettier: eslintPluginPrettier
+    },
+    rules: {
+      'prettier/prettier': 'error',
+      '@typescript-eslint/no-require-imports': [
+        'error',
+        {
+          allowAsImport: true
+        }
+      ]
+    }
+  }
+]);

package.json

@@ -1,16 +1,13 @@
 {
   "name": "docker-setup-docker",
   "description": "Set up Docker for use in GitHub Actions by downloading and installing a version of Docker CE",
-  "main": "lib/main.js",
+  "type": "module",
+  "main": "src/main.ts",
   "scripts": {
     "build": "ncc build src/main.ts --source-map --minify --license licenses.txt",
-    "lint": "yarn run prettier && yarn run eslint",
-    "format": "yarn run prettier:fix && yarn run eslint:fix",
-    "eslint": "eslint --max-warnings=0 .",
-    "eslint:fix": "eslint --fix .",
-    "prettier": "prettier --check \"./**/*.ts\"",
-    "prettier:fix": "prettier --write \"./**/*.ts\"",
-    "test": "jest",
+    "lint": "eslint --max-warnings=0 .",
+    "format": "eslint --fix .",
+    "test": "vitest run",
     "all": "yarn run build && yarn run format && yarn test"
   },
   "repository": {
@@ -30,21 +27,19 @@
     "@docker/actions-toolkit": "^0.71.0"
   },
   "devDependencies": {
-    "@eslint/compat": "^2.0.0",
-    "@eslint/eslintrc": "^3.3.3",
-    "@eslint/js": "^9.39.2",
-    "@types/node": "^20.19.27",
-    "@typescript-eslint/eslint-plugin": "^8.50.0",
-    "@typescript-eslint/parser": "^8.50.0",
+    "@eslint/js": "^9.39.3",
+    "@types/node": "^20.19.35",
+    "@typescript-eslint/eslint-plugin": "^8.56.1",
+    "@typescript-eslint/parser": "^8.56.1",
     "@vercel/ncc": "^0.38.4",
-    "eslint": "^9.39.2",
+    "@vitest/coverage-v8": "^4.0.18",
+    "@vitest/eslint-plugin": "^1.6.9",
+    "eslint": "^9.39.3",
     "eslint-config-prettier": "^10.1.8",
-    "eslint-plugin-jest": "^29.5.0",
-    "eslint-plugin-prettier": "^5.5.4",
-    "jest": "^30.2.0",
-    "prettier": "^3.7.4",
-    "ts-jest": "^29.4.6",
-    "ts-node": "^10.9.2",
-    "typescript": "^5.9.3"
+    "eslint-plugin-prettier": "^5.5.5",
+    "globals": "^17.3.0",
+    "prettier": "^3.8.1",
+    "typescript": "^5.9.3",
+    "vitest": "^4.0.18"
   }
 }

src/context.ts

@@ -3,8 +3,8 @@ import path from 'path';
 import * as core from '@actions/core';
 import {parse} from 'csv-parse/sync';
 
-import {InstallSource} from '@docker/actions-toolkit/lib/docker/install';
-import {Util} from '@docker/actions-toolkit/lib/util';
+import {InstallSource} from '@docker/actions-toolkit/lib/docker/install.js';
+import {Util} from '@docker/actions-toolkit/lib/util.js';
 
 export interface Inputs {
   source: InstallSource;

src/main.ts

@@ -2,13 +2,13 @@ import * as crypto from 'crypto';
 import path from 'path';
 import * as core from '@actions/core';
 import * as actionsToolkit from '@docker/actions-toolkit';
-import {Install} from '@docker/actions-toolkit/lib/docker/install';
-import {Docker} from '@docker/actions-toolkit/lib/docker/docker';
-import {Install as RegclientInstall} from '@docker/actions-toolkit/lib/regclient/install';
-import {Install as UndockInstall} from '@docker/actions-toolkit/lib/undock/install';
+import {Install} from '@docker/actions-toolkit/lib/docker/install.js';
+import {Docker} from '@docker/actions-toolkit/lib/docker/docker.js';
+import {Install as RegclientInstall} from '@docker/actions-toolkit/lib/regclient/install.js';
+import {Install as UndockInstall} from '@docker/actions-toolkit/lib/undock/install.js';
 
-import * as context from './context';
-import * as stateHelper from './state-helper';
+import * as context from './context.js';
+import * as stateHelper from './state-helper.js';
 
 const regctlDefaultVersion = 'v0.8.3';
 const undockDefaultVersion = 'v0.10.0';