chore: support ESM (#174)

Signed-off-by: 木杉 <[email protected]>

package.json

@@ -2,17 +2,21 @@
   "name": "casbin",
   "version": "5.0.6",
   "description": "An authorization library that supports access control models like ACL, RBAC, ABAC in Node.JS",
-  "main": "lib/index.js",
-  "typings": "lib/index.d.ts",
+  "main": "lib/cjs/index.js",
+  "typings": "lib/cjs/index.d.ts",
+  "module": "lib/esm/index.js",
   "scripts": {
-    "prepack": "yarn run lint && yarn run test && yarn build",
-    "postpack": "rimraf lib",
-    "build": "rimraf lib && tsc",
+    "prepack": "run-s lint test build",
+    "postpack": "run-s clean",
+    "build": "run-s clean && run-p build:*",
+    "build:cjs": "tsc -p tsconfig.cjs.json",
+    "build:esm": "tsc -p tsconfig.esm.json",
     "test": "jest",
     "lint": "eslint . --ext .js,.ts",
     "fmt": "eslint . --ext .js,.ts --fix",
     "semantic-release": "semantic-release",
-    "commit": "git-cz"
+    "commit": "git-cz",
+    "clean": "rimraf lib"
   },
   "devDependencies": {
     "@semantic-release/changelog": "^3.0.6",
@@ -32,6 +36,7 @@
     "husky": "^2.3.0",
     "jest": "^24.3.1",
     "lint-staged": "^8.1.7",
+    "npm-run-all": "^4.1.5",
     "prettier": "^1.19.1",
     "pretty-quick": "^2.0.1",
     "rimraf": "^2.6.2",

tsconfig.cjs.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig",
+  "compilerOptions": {
+    "target": "ES6",
+    "module": "CommonJS",
+    "outDir": "lib/cjs"
+  }
+}

tsconfig.esm.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig",
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "outDir": "lib/esm"
+  }
+}

tsconfig.json

@@ -1,15 +1,12 @@
 {
   "compilerOptions": {
-    "target": "es6",
-    "module": "commonjs",
-    "moduleResolution": "node",
+    "target": "ES6",
+    "module": "CommonJS",
+    "moduleResolution": "Node",
     "strict": true,
     "strictPropertyInitialization": false,
     "declaration": true,
-    "declarationDir": "lib",
-    "outDir": "lib"
+    "downlevelIteration": true
   },
-  "include": [
-    "src/**/*"
-  ]
+  "include": ["src/**/*"]
 }