Convert library to ES modules

.babelrc

@@ -1,7 +1,9 @@
 {
   "presets": [
     ["@babel/preset-env", {
-      "targets": { "node": "current" }
+      "targets": { "node": "14" },
+      // Leave import/export statements unchanged in the babel transpiling output.
+      "modules": false
     }]
   ]
 }

.eslintignore

@@ -1,3 +1,3 @@
-dist/
+lib/
 node_modules/
 tests/fixtures/

.eslintrc

@@ -17,9 +17,7 @@
   "rules": {
     "import/no-extraneous-dependencies": ["error", {
         "devDependencies": [
-          "Gruntfile.js",
-          "tests/**/*.js",
-          "webpack.config.js",
+          "tests/**/*.js"
         ]
       }
     ],
@@ -28,6 +26,8 @@
     // We almost only use anonymous functions...
     "func-names": "off",
     // We don't use .tsx files
-    "amo/only-tsx-files": "off"
+    "amo/only-tsx-files": "off",
+    // Disabled due to https://github.com/import-js/eslint-plugin-import/issues/2104
+    "import/extensions": [0, "never"]
   }
 }

.gitignore

@@ -1,12 +1,6 @@
-# OSX
-.DS_Store
-
-# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
-.grunt
-.cache
-
 # Build artifacts.
-npm-debug.log
-node_modules
-dist/*
-coverage
+/coverage/
+/lib/*
+/node_modules/
+/npm-debug.log
+/*.tgz

.prettierignore

@@ -6,7 +6,7 @@ Dockerfile
 /bin/
 /build/
 /coverage/
-/dist/
+/lib/
 /docker/
 /node_modules/
 # white-list files we want to process

README.md

@@ -19,7 +19,7 @@ Currently, this is intended for use in [NodeJS](https://nodejs.org/) only and sh
 Here is how to retrieve a signed version of an [XPI file](https://developer.mozilla.org/en-US/docs/Mozilla/XPI):
 
 ```javascript
-var { signAddon } = require('sign-addon');
+import { signAddon } from 'sign-addon';
 
 signAddon({
   // Required arguments:
@@ -81,12 +81,6 @@ signAddon({
   });
 ```
 
-In ES6 code, you can import it more concisely:
-
-```javascript
-import { signAddon } from 'sign-addon';
-```
-
 ## Dealing With Extension IDs
 
 Here are some notes about dealing with IDs when using `signAddon()`:

jest.config.js

@@ -1,4 +1,6 @@
-module.exports = {
+export default {
+  // See: https://jestjs.io/docs/ecmascript-modules
+  transform: {},
   testEnvironment: 'node',
   testPathIgnorePatterns: ['<rootDir>/dist/', '<rootDir>/node_modules/'],
 };