simplify the TS build: output a simpler structure based on the source…

… structure, with type definitions and source maps, in a way that is as compatible with vanilla ES Modules as possible

.eslintrc.js → .eslintrc.cjs

@@ -15,7 +15,7 @@ module.exports = {
 		'eqeqeq': ['error', 'always', { 'null': 'ignore' }],
 
 		// imports
-		'import/extensions': ['warn', 'never'],
+		'import/extensions': ['warn', 'always'], // "always" is most compatible with default vanilla ES Modules
 		'import/order': [
 			'warn',
 			{

.mocharc.json

@@ -0,0 +1,7 @@
+{
+	"Xrequire": "@babel/register",
+		"Xexperimental-specifier-resolution=node": "",
+	"node-option": [
+		"loader=ts-node/esm"
+	]
+}

benchmark/benchmark.ts

@@ -5,10 +5,10 @@ import fs from 'fs';
 import path from 'path';
 import { gitP } from 'simple-git';
 import { argv } from 'yargs';
-import { parseLanguageNames } from '../tests/helper/test-case';
-import { config as baseConfig } from './config';
-import type { Prism } from '../src/core';
-import type { Config, ConfigOptions } from './config';
+import { parseLanguageNames } from '../tests/helper/test-case.js';
+import { config as baseConfig } from './config.js';
+import type { Prism } from '../src/core.js';
+import type { Config, ConfigOptions } from './config.js';
 import type { Options, Stats } from 'benchmark';
 
 

package.json

@@ -2,14 +2,15 @@
 	"name": "prismjs",
 	"version": "1.29.0",
 	"description": "Lightweight, robust, elegant syntax highlighting. A spin-off project from Dabblet.",
-	"main": "prism.js",
+  "type": "module",
+	"main": "dist/core/prism.js",
 	"style": "themes/prism.css",
 	"engines": {
 		"node": ">=14"
 	},
 	"scripts": {
 		"benchmark": "ts-node benchmark/benchmark.ts",
-		"build": "ts-node scripts/build.ts",
+		"build": "ts-node-esm scripts/build.ts && npm run tsc",
 		"prepare": "npm run build",
 		"lint": "eslint . --cache",
 		"lint:fix": "npm run lint -- --fix",
@@ -24,7 +25,8 @@
 		"test:plugins": "ts-mocha tests/plugins/**/*.ts",
 		"test:runner": "ts-mocha tests/testrunner-tests.ts",
 		"test": "npm-run-all test:*",
-		"tsc": "tsc && tsc -p tests/tsconfig.json"
+    "typecheck": "tsc --noEmit && tsc -p tests/tsconfig.json --noEmit",
+		"tsc": "tsc"
 	},
 	"repository": {
 		"type": "git",