feat: Expose as ESM (#24)

- expose as ESM and ES2020
- use GitHub Action to use Node 16
- matrix-test with node v14 and v16

.eslintrc.json

@@ -0,0 +1,6 @@
+{
+  "extends": ["3box", "3box/jest", "3box/typescript"],
+  "parserOptions": {
+    "project": ["./tsconfig.json"]
+  }
+}

.github/workflows/main.yml

@@ -3,21 +3,23 @@ on: [push]
 jobs:
   build:
     runs-on: ubuntu-latest
-
+    strategy:
+      matrix:
+        node: ['14', '16']
     steps:
       - name: Begin CI...
         uses: actions/checkout@v2
 
-      - name: Use Node 12
+      - name: Use Node ${{ matrix.node }}
         uses: actions/setup-node@v1
         with:
-          node-version: 12.x
+          node-version: ${{ matrix.node }}
 
       - name: Use cached node_modules
         uses: actions/cache@v1
         with:
           path: node_modules
-          key: nodeModules-${{ hashFiles('**/package-lock.json') }}
+          key: nodeModules-${{ hashFiles('**/package-lock.json') }}-${{ matrix.node }}
           restore-keys: |
             nodeModules-
 

.prettierrc.json

@@ -0,0 +1 @@
+"eslint-config-3box/prettier.config"

babel.config.json

@@ -0,0 +1,3 @@
+{
+  "presets": [["@babel/preset-env", { "targets": { "node": 16 } }], "@babel/preset-typescript"]
+}

jest.config.json

@@ -0,0 +1,8 @@
+{
+  "testPathIgnorePatterns": [".*__fixtures__.*"],
+  "testEnvironment": "node",
+  "extensionsToTreatAsEsm": [".ts"],
+  "moduleNameMapper": {
+    "^(\\.{1,2}/.*)\\.js$": "$1"
+  }
+}