feat: esm + cjs

package.json

@@ -1,23 +1,32 @@
 {
   "name": "datelative",
-  "version": "0.0.3",
+  "version": "0.0.5",
   "description": "A library that converts relative string text to JavaScript dates",
-  "main": "index.js",
-  "types": "index.d.ts",
-  "type": "module",
+  "exports": {
+    ".": {
+      "types": "./dist/dts/index.d.ts",
+      "require": "./dist/cjs/index.js",
+      "import": "./dist/esm/index.js",
+      "default": "./dist/esm/index.js"
+    }
+  },
+
   "scripts": {
     "test": "node --test",
     "test:watch": "node --test --watch",
-    "prepublishOnly": "npx tsc"
+    "prepublishOnly": "npm run build",
+    "clear": "rm -rf dist/*",
+    "prebuild": "npm run clear",
+    "build": "tsc -b ./tsconfig.cjs.json ./tsconfig.esm.json ./tsconfig.dts.json",
+    "postbuild": "./postbuild.sh"
   },
+
   "repository": {
     "type": "git",
     "url": "git+https://github.com/onhate/datelative.git"
   },
   "files": [
-    "index.js",
-    "index.d.ts",
-    "index.d.ts.map",
+    "dist/*",
     "README.md",
     "package.json"
   ],

postbuild.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+## So entire idea of this script is to generate separate package.json for ESM build (under build/esm directory) with the following content:
+# { "type": "module" }
+# This will tell the consumer build system that the underlying directory has modern EcmaScript modules. Otherwise, it will complain with:
+# SyntaxError: Unexpected token 'export'
+
+echo '{ "type": "module" }' > dist/esm/package.json

tsconfig.json → tsconfig.base.json

@@ -4,8 +4,7 @@
   ],
   "compilerOptions": {
     "allowJs": true,
-    "declaration": true,
-    "emitDeclarationOnly": true,
-    "declarationMap": true
+    "pretty": true,
+    "strict": true
   }
 }

tsconfig.cjs.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.base.json",
+  "compilerOptions": {
+    "module": "commonjs",
+    "outDir": "dist/cjs",
+    "target": "es2015"
+  }
+}

tsconfig.dts.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "dist/dts",
+    "declaration": true,
+    "emitDeclarationOnly": true
+  }
+}

tsconfig.esm.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.base.json",
+  "compilerOptions": {
+    "module": "esnext",
+    "outDir": "dist/esm",
+    "target": "esnext"
+  }
+}