feat: added support for ESM (ECMAScript modules)

BREAKING CHANGE: due to added ESM module support Node.js version with
ESM implementation bugs are no longer supported, this only affects early
v13.x versions. The resulting Node.js semver range is
`>=10.13.0 < 13 || >=13.7.0`

.github/workflows/test.yml

@@ -48,7 +48,7 @@ jobs:
           - 11
           - 12.0.0
           - 12
-          - 13.0.0
+          - 13.7.0
           - 13
           - 14.0.0
           - 14

lib/index.mjs

@@ -0,0 +1,9 @@
+import mod from './index.js'
+
+export default mod
+export const JWE = mod.JWE
+export const JWK = mod.JWK
+export const JWKS = mod.JWKS
+export const JWS = mod.JWS
+export const JWT = mod.JWT
+export const errors = mod.errors

package.json

@@ -45,18 +45,22 @@
   "funding": "https://github.com/sponsors/panva",
   "license": "MIT",
   "author": "Filip Skokan <[email protected]>",
+  "exports": {
+    "import": "./lib/index.mjs",
+    "require": "./lib/index.js"
+  },
+  "main": "lib/index.js",
+  "types": "types/index.d.ts",
   "files": [
     "lib/**/*.js",
     "LICENSE_THIRD_PARTY",
     "types/index.d.ts"
   ],
-  "main": "lib/index.js",
-  "types": "types/index.d.ts",
   "scripts": {
     "coverage": "c8 ava",
     "lint": "standard",
-    "lint-ts": "npx typescript@~3.6.0 --build types",
     "lint-fix": "standard --fix",
+    "lint-ts": "npx typescript@~3.6.0 --build types",
     "test": "ava",
     "watch": "ava --watch"
   },
@@ -90,7 +94,7 @@
     "standard": "^14.3.1"
   },
   "engines": {
-    "node": ">=10.13.0"
+    "node": ">=10.13.0 < 13 || >=13.7.0"
   },
   "standard": {
     "parser": "babel-eslint"