Conversion to ESM

.eslintrc

@@ -38,6 +38,7 @@
         "message": "Use `globalThis` instead"
       }
     ],
+    "prefer-rest-params": 0,
     "require-yield": 0,
     "eqeqeq": ["error", "smart"],
     "spaced-comment": [

README.md

@@ -471,7 +471,7 @@ npm install
 # build the dist
 npm run build
 # run the repl (this allows you to import from ./src)
-npm run ts-node
+npm run tsx
 # run the tests
 npm run test
 # lint the source code

benches/index.ts

@@ -2,22 +2,25 @@
 
 import fs from 'fs';
 import path from 'path';
+import url from 'url';
 import si from 'systeminformation';
 
+const dirname = url.fileURLToPath(new URL('.', import.meta.url));
+
 async function main(): Promise<void> {
-  await fs.promises.mkdir(path.join(__dirname, 'results'), { recursive: true });
+  await fs.promises.mkdir(path.join(dirname, 'results'), { recursive: true });
   const resultFilenames = await fs.promises.readdir(
-    path.join(__dirname, 'results'),
+    path.join(dirname, 'results'),
   );
   const metricsFile = await fs.promises.open(
-    path.join(__dirname, 'results', 'metrics.txt'),
+    path.join(dirname, 'results', 'metrics.txt'),
     'w',
   );
   let concatenating = false;
   for (const resultFilename of resultFilenames) {
     if (/.+_metrics\.txt$/.test(resultFilename)) {
       const metricsData = await fs.promises.readFile(
-        path.join(__dirname, 'results', resultFilename),
+        path.join(dirname, 'results', resultFilename),
       );
       if (concatenating) {
         await metricsFile.write('\n');
@@ -33,7 +36,7 @@ async function main(): Promise<void> {
     system: 'model, manufacturer',
   });
   await fs.promises.writeFile(
-    path.join(__dirname, 'results', 'system.json'),
+    path.join(dirname, 'results', 'system.json'),
     JSON.stringify(systemData, null, 2),
   );
 }

benches/utils/index.ts

@@ -1 +1 @@
-export * from './utils';
+export * from './utils.js';

benches/utils/utils.ts

@@ -1,27 +1,30 @@
 import fs from 'fs';
 import path from 'path';
+import url from 'url';
 import b from 'benny';
 import { codeBlock } from 'common-tags';
 import packageJson from '../../package.json';
 
+const dirname = url.fileURLToPath(new URL('.', import.meta.url));
+
 const suiteCommon = [
   b.cycle(),
   b.complete(),
   b.save({
     file: (summary) => summary.name,
-    folder: path.join(__dirname, '../results'),
+    folder: path.join(dirname, '../results'),
     version: packageJson.version,
     details: true,
   }),
   b.save({
     file: (summary) => summary.name,
-    folder: path.join(__dirname, '../results'),
+    folder: path.join(dirname, '../results'),
     version: packageJson.version,
     format: 'chart.html',
   }),
   b.complete((summary) => {
     const filePath = path.join(
-      __dirname,
+      dirname,
       '../results',
       summary.name + '_metrics.txt',
     );

jest.config.js → jest.config.mjs

@@ -1,18 +1,16 @@
-const path = require('path');
-const { pathsToModuleNameMapper } = require('ts-jest');
-const { compilerOptions } = require('./tsconfig');
+import path from 'node:path';
+import url from 'node:url';
+import tsconfigJSON from './tsconfig.json' assert { type: "json" };
 
-const moduleNameMapper = pathsToModuleNameMapper(compilerOptions.paths, {
-  prefix: '<rootDir>/src/',
-});
+const projectPath = path.dirname(url.fileURLToPath(import.meta.url));
 
 // Global variables that are shared across the jest worker pool
 // These variables must be static and serializable
 const globals = {
   // Absolute directory to the project root
-  projectDir: __dirname,
+  projectDir: projectPath,
   // Absolute directory to the test root
-  testDir: path.join(__dirname, 'tests'),
+  testDir: path.join(projectPath, 'tests'),
   // Default asynchronous test timeout
   defaultTimeout: 20000,
   // Timeouts rely on setTimeout which takes 32 bit numbers
@@ -24,7 +22,7 @@ const globals = {
 // They can however receive the process environment
 // Use `process.env` to set variables
 
-module.exports = {
+const config = {
   testEnvironment: 'node',
   verbose: true,
   collectCoverage: false,
@@ -40,10 +38,10 @@ module.exports = {
           parser: {
             syntax: "typescript",
             tsx: true,
-            decorators: compilerOptions.experimentalDecorators,
+            decorators: tsconfigJSON.compilerOptions.experimentalDecorators,
             dynamicImport: true,
           },
-          target: compilerOptions.target.toLowerCase(),
+          target: tsconfigJSON.compilerOptions.target.toLowerCase(),
           keepClassNames: true,
         },
       }
@@ -77,5 +75,10 @@ module.exports = {
     'jest-extended/all',
     '<rootDir>/tests/setupAfterEnv.ts'
   ],
-  moduleNameMapper: moduleNameMapper,
+  moduleNameMapper: {
+    "^(\\.{1,2}/.*)\\.js$": "$1",
+  },
+  extensionsToTreatAsEsm: ['.ts', '.tsx', '.mts'],
 };
+
+export default config;