Convert to ESM and use rollup.

First attempt: #134

Author: fniephaus

action.yml

@@ -72,6 +72,6 @@ outputs:
     description: 'A boolean value to indicate an exact match was found for the primary key'
 runs:
   using: 'node20'
-  main: 'dist/main/index.js'
-  post: 'dist/cleanup/index.js'
+  main: 'dist/main.js'
+  post: 'dist/cleanup.js'
   post-if: 'success()'

dist/main/index.js renamed to dist/cleanup.js

@@ -1,14 +1,29 @@
-module.exports = {
+// See: https://jestjs.io/docs/configuration
+
+/** @type {import('ts-jest').JestConfigWithTsJest} **/
+export default {
   clearMocks: true,
   collectCoverage: true,
   collectCoverageFrom: ['./src/**'],
   coverageDirectory: './coverage',
   coveragePathIgnorePatterns: ['/node_modules/', '/dist/'],
   coverageReporters: ['json-summary', 'text', 'lcov'],
-  moduleFileExtensions: ['js', 'ts'],
+  extensionsToTreatAsEsm: ['.ts'],
+  moduleFileExtensions: ['ts', 'js'],
+  preset: 'ts-jest',
+  reporters: ['default'],
+  resolver: 'ts-jest-resolver',
+  testEnvironment: 'node',
   testMatch: ['**/*.test.ts'],
+  testPathIgnorePatterns: ['/dist/', '/node_modules/'],
   transform: {
-    '^.+\\.ts$': 'ts-jest'
+    '^.+\\.ts$': [
+      'ts-jest',
+      {
+        tsconfig: 'tsconfig.eslint.json',
+        useESM: true
+      }
+    ]
   },
   verbose: true
 }