Use es modules

jest.config.js

@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   clearMocks: true,
   collectCoverage: true,
   collectCoverageFrom: [

package.json

@@ -4,6 +4,7 @@
   "private": true,
   "description": "Sets up a problem matcher for markdownlint-cli to create annotations for violations",
   "main": "dist/index.js",
+  "type": "module",
   "scripts": {
     "build": "tsc",
     "lint": "tsc --noEmit",

src/main.ts

@@ -1,16 +1,15 @@
 import { readFile } from "node:fs/promises";
-import { join } from "node:path";
 
 import { getInput, setFailed } from "@actions/core";
-import { issueCommand } from "@actions/core/lib/command"
+import { issueCommand } from "@actions/core/lib/command.js"
 
 import type { ProblemMatcherDocument } from "github-actions-problem-matcher-typings";
 
 export async function run(): Promise<void> {
   try {
     const action = getInput("action");
 
-    const matcherFile = join(__dirname, "problem-matcher.json");
+    const matcherFile = new URL("problem-matcher.json", import.meta.url);
 
     switch (action) {
       case "add":

tsconfig.json

@@ -2,8 +2,8 @@
   "compilerOptions": {
     /* Basic Options */
     // "incremental": true,                   /* Enable incremental compilation */
-    "target": "es2021",                       /* 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'. */
+    "target": "ES2022",                       /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+    "module": "Node16",                       /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     // "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'. */
@@ -38,7 +38,7 @@
     // "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). */
+    "moduleResolution": "Node16",             /* 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. */