Provide a CJS build

package.json

@@ -18,14 +18,22 @@
   "license": "MIT",
   "author": "Robin Löffel (https://robinloeffel.ch) <[email protected]>",
   "type": "module",
-  "main": "dist/index.js",
-  "types": "dist/index.d.ts",
+  "main": "dist/esm/index.js",
+  "types": "dist/types/index.d.ts",
+  "exports": {
+    "types": "./dist/types/index.d.ts",
+    "require": "./dist/cjs/index.js",
+    "default": "./dist/esm/index.js"
+  },
   "files": [
     "src",
     "dist"
   ],
   "scripts": {
-    "build": "rm -rf dist && tsc --project tsconfig.build.json",
+    "build": "rm -rf dist && concurrently npm:build:*",
+    "build:cjs": "tsc --project tsconfig.cjs.json",
+    "build:esm": "tsc --project tsconfig.esm.json",
+    "build:types": "tsc --project tsconfig.types.json",
     "prepack": "npm run build",
     "start": "npm run watch",
     "watch": "concurrently npm:watch:*",

test/esbuild.js

@@ -1,5 +1,5 @@
 import { build } from "esbuild";
-import eslint from "../dist/index.js";
+import eslint from "../dist/esm/index.js";
 
 const absolute = relative => new URL(relative, import.meta.url).pathname;
 

tsconfig.cjs.json

@@ -0,0 +1,15 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "noEmit": false,
+    "outDir": "./dist/cjs",
+
+    // Enable CJS output
+    "module": "CommonJS",
+    "moduleResolution": "Node",
+
+    // verbatimModuleSyntax doesn't transform import to require
+    "verbatimModuleSyntax": false
+  },
+  "include": ["./src"]
+}

tsconfig.esm.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "noEmit": false,
+    "outDir": "./dist/esm"
+  },
+  "include": ["./src"]
+}

tsconfig.build.json → tsconfig.types.json

@@ -3,9 +3,8 @@
   "compilerOptions": {
     "noEmit": false,
     "declaration": true,
-    "outDir": "./dist"
+    "emitDeclarationOnly": true,
+    "outDir": "./dist/types"
   },
-  "include": [
-    "./src"
-  ]
+  "include": ["./src"]
 }