Migrate to ESM (#763)

jest.config.js

@@ -1,7 +1,9 @@
-module.exports = {
-  preset: 'ts-jest',
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+export default {
+  preset: 'ts-jest/presets/default-esm',
   clearMocks: true,
-  testEnvironment: 'node',
-  testMatch: ['**/*.test.ts'],
-  verbose: true
+  // https://kulshekhar.github.io/ts-jest/docs/guides/esm-support/
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1',
+  },
 }

package.json

@@ -6,13 +6,15 @@
     "build": "ncc build --source-map --license licenses.txt src/main.ts",
     "test": "jest"
   },
+  "type": "module",
   "dependencies": {
     "@actions/core": "1.10.1",
     "@actions/github": "6.0.0",
     "@octokit/plugin-retry": "6.0.1",
     "@octokit/request-error": "5.1.0"
   },
   "devDependencies": {
+    "@tsconfig/node20": "^20.1.4",
     "@types/jest": "29.5.12",
     "@types/node": "20.12.7",
     "@vercel/ncc": "0.38.1",

src/body.ts

@@ -1,6 +1,6 @@
 import * as core from '@actions/core'
 import * as github from '@actions/github'
-import { Issue, Octokit } from './types'
+import { Issue, Octokit } from './types.js'
 
 export const appendOrUpdateBody = async (octokit: Octokit, issue: Issue, content: string) => {
   let fetchedBody = issue.body

src/github.ts

@@ -1,7 +1,5 @@
-import { getOctokitOptions, GitHub } from '@actions/github/lib/utils'
+import * as github from '@actions/github'
 import * as pluginRetry from '@octokit/plugin-retry'
+import { Octokit } from './types.js'
 
-export const getOctokit = (token: string) => {
-  const MyOctokit = GitHub.plugin(pluginRetry.retry)
-  return new MyOctokit(getOctokitOptions(token))
-}
+export const getOctokit = (token: string): Octokit => github.getOctokit(token, undefined, pluginRetry.retry)

src/main.ts

@@ -1,5 +1,5 @@
 import * as core from '@actions/core'
-import { run } from './run'
+import { run } from './run.js'
 
 const main = async (): Promise<void> => {
   await run({

src/run.ts

@@ -1,9 +1,9 @@
 import * as core from '@actions/core'
 import * as github from '@actions/github'
 import { RequestError } from '@octokit/request-error'
-import { appendOrUpdateBody } from './body'
-import { getOctokit } from './github'
-import { Issue, Octokit } from './types'
+import { appendOrUpdateBody } from './body.js'
+import { getOctokit } from './github.js'
+import { Issue, Octokit } from './types.js'
 
 export type Inputs = {
   issueNumbers: number[]

src/types.ts

@@ -1,6 +1,6 @@
-import { GitHub } from '@actions/github/lib/utils'
+import * as github from '@actions/github'
 
-export type Octokit = InstanceType<typeof GitHub>
+export type Octokit = ReturnType<typeof github.getOctokit>
 
 export type Issue = {
   owner: string

tests/body.test.ts

@@ -1,4 +1,4 @@
-import { computeBody } from '../src/body'
+import { computeBody } from '../src/body.js'
 
 const marker = '<!-- marker -->'
 

tests/run.test.ts

@@ -1,4 +1,4 @@
-import { run } from '../src/run'
+import { run } from '../src/run.js'
 import { RequestError } from '@octokit/request-error'
 
 const octokitMock = {

tsconfig.json

@@ -1,9 +1,4 @@
 {
-  "compilerOptions": {
-    "target": "es6",
-    "module": "commonjs",
-    "strict": true,
-    "outDir": "./lib",
-    "rootDirs": ["./src"],
-  }
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "extends": "@tsconfig/node20/tsconfig.json"
 }