Add GitHub action infrastructure.

.eslintignore

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+dist/
+lib/
+node_modules/
+jest.config.js

.eslintrc.json

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+{
+    "plugins": ["jest", "@typescript-eslint"],
+    "extends": ["plugin:github/recommended"],
+    "parser": "@typescript-eslint/parser",
+    "parserOptions": {
+      "ecmaVersion": 9,
+      "sourceType": "module",
+      "project": "./tsconfig.json"
+    },
+    "rules": {
+      "i18n-text/no-en": "off",
+      "eslint-comments/no-use": "off",
+      "import/no-namespace": "off",
+      "no-unused-vars": "off",
+      "@typescript-eslint/no-unused-vars": "error",
+      "@typescript-eslint/explicit-member-accessibility": ["error", {"accessibility": "no-public"}],
+      "@typescript-eslint/no-require-imports": "error",
+      "@typescript-eslint/array-type": "error",
+      "@typescript-eslint/await-thenable": "error",
+      "@typescript-eslint/ban-ts-comment": "error",
+      "camelcase": "off",
+      "@typescript-eslint/consistent-type-assertions": "error",
+      "@typescript-eslint/explicit-function-return-type": ["error", {"allowExpressions": true}],
+      "@typescript-eslint/func-call-spacing": ["error", "never"],
+      "@typescript-eslint/no-array-constructor": "error",
+      "@typescript-eslint/no-empty-interface": "error",
+      "@typescript-eslint/no-explicit-any": "error",
+      "@typescript-eslint/no-extraneous-class": "error",
+      "@typescript-eslint/no-for-in-array": "error",
+      "@typescript-eslint/no-inferrable-types": "error",
+      "@typescript-eslint/no-misused-new": "error",
+      "@typescript-eslint/no-namespace": "error",
+      "@typescript-eslint/no-non-null-assertion": "warn",
+      "@typescript-eslint/no-unnecessary-qualifier": "error",
+      "@typescript-eslint/no-unnecessary-type-assertion": "error",
+      "@typescript-eslint/no-useless-constructor": "error",
+      "@typescript-eslint/no-var-requires": "error",
+      "@typescript-eslint/prefer-for-of": "warn",
+      "@typescript-eslint/prefer-function-type": "warn",
+      "@typescript-eslint/prefer-includes": "error",
+      "@typescript-eslint/prefer-string-starts-ends-with": "error",
+      "@typescript-eslint/promise-function-async": "error",
+      "@typescript-eslint/require-array-sort-compare": "error",
+      "@typescript-eslint/restrict-plus-operands": "error",
+      "semi": "off",
+      "@typescript-eslint/semi": ["error", "never"],
+      "@typescript-eslint/type-annotation-spacing": "error",
+      "@typescript-eslint/unbound-method": "error"
+    },
+    "env": {
+      "node": true,
+      "es6": true,
+      "jest/globals": true
+    }
+  }

.gitattributes

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+dist/** -diff linguist-generated=true 

.gitignore

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+# Dependency directory
+node_modules
+
+# Rest pulled from https://github.com/github/gitignore/blob/master/Node.gitignore
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# next.js build output
+.next
+
+# nuxt.js build output
+.nuxt
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# OS metadata
+.DS_Store
+Thumbs.db
+
+# Ignore built ts files
+__tests__/runner/*
+lib/**/*

.prettierignore

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+dist/
+lib/
+node_modules/

.prettierrc.json

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+{
+  "printWidth": 80,
+  "tabWidth": 2,
+  "useTabs": false,
+  "semi": false,
+  "singleQuote": true,
+  "trailingComma": "none",
+  "bracketSpacing": false,
+  "arrowParens": "avoid"
+}

__tests__/main.test.ts

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+import {expect, test} from '@jest/globals'
+
+test('dummy test', async () => {
+  expect(true).toBeTruthy()
+})

action.yml

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+name: 'GitHub Action for GraalVM'
+description: 'Set up a specific version of GraalVM Community Edition'
+author: 'GraalVM Developers'
+branding:
+  icon: 'terminal'  
+  color: 'blue'
+inputs:
+  version:
+    required: true
+    description: 'GraalVM version (release, latest, nightly, trunk).'
+  java-version:
+    required: true
+    description: 'Java version (11 or 17, 8 or 16 for older releases).'
+  components:
+    required: false
+    description: 'Comma-separated list of GraalVM components to be installed'
+    default: ''
+  github-token:
+    required: false
+    description: 'Set it to secrets.GITHUB_TOKEN to increase rate limits when accessing the GitHub API'
+    default: ''
+  set-java-home:
+    required: false
+    description: 'Set $JAVA_HOME to the GraalVM installation. Default: true'
+    default: 'true'
+runs:
+  using: 'node12'
+  main: 'dist/index.js'

jest.config.js

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+module.exports = {
+  clearMocks: true,
+  moduleFileExtensions: ['js', 'ts'],
+  testMatch: ['**/*.test.ts'],
+  transform: {
+    '^.+\\.ts$': 'ts-jest'
+  },
+  verbose: true
+}

package.json

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+{
+  "name": "setup-graalvm",
+  "version": "1.0.0",
+  "private": true,
+  "description": "GitHub Action for GraalVM",
+  "main": "lib/main.js",
+  "scripts": {
+    "build": "tsc",
+    "format": "prettier --write '**/*.ts'",
+    "format-check": "prettier --check '**/*.ts'",
+    "lint": "eslint src/**/*.ts",
+    "package": "ncc build --source-map --license licenses.txt",
+    "test": "jest",
+    "all": "npm run build && npm run format && npm run lint && npm run package && npm test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/graalvm/setup-graalvm.git"
+  },
+  "keywords": [
+    "graalvm",
+    "native image",
+    "actions",
+    "setup"
+  ],
+  "author": "GraalVM Developers",
+  "license": "UPL",
+  "dependencies": {
+    "@actions/core": "^1.6.0",
+    "@actions/exec": "^1.1.0",
+    "@actions/http-client": "^1.0.11",
+    "@actions/io": "^1.1.1",
+    "@actions/tool-cache": "^1.7.1",
+    "@octokit/core": "^3.5.1",
+    "@octokit/types": "^6.34.0"
+  },
+  "devDependencies": {
+    "@types/node": "^17.0.6",
+    "@typescript-eslint/parser": "^5.8.1",
+    "@vercel/ncc": "^0.33.1",
+    "eslint": "^8.6.0",
+    "eslint-plugin-github": "^4.3.5",
+    "eslint-plugin-jest": "^25.3.4",
+    "jest": "^27.4.5",
+    "js-yaml": "^4.1.0",
+    "prettier": "2.5.1",
+    "ts-jest": "^27.1.2",
+    "typescript": "^4.5.4"
+  }
+}

src/main.ts

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+import * as core from '@actions/core'
+
+async function run(): Promise<void> {
+  try {
+    let graalVMHome
+    core.exportVariable('GRAALVM_HOME', graalVMHome)
+  } catch (error) {
+    if (error instanceof Error) core.setFailed(error.message)
+  }
+}
+
+run()

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es6",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    "outDir": "./lib",                        /* Redirect output structure to the directory. */
+    "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    "strict": true,                           /* Enable all strict type-checking options. */
+    "noImplicitAny": true,                    /* Raise error on expressions and declarations with an implied 'any' type. */
+    "esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+  },
+  "exclude": ["node_modules", "**/*.test.ts"]
+}