use native node esm in ava - currently broken in ava - see standard-things/esm#855

Author: craigahobbs

static/package.json

@@ -1,16 +1,13 @@
 {
+    "type": "module",
     "devDependencies": {
         "ava": "~3.8.0",
         "browser-env": "~3.3.0",
         "eslint": "~7.0.0",
-        "esm": "~3.2.0",
         "nyc": "~15.0.0"
     },
     "ava": {
-        "timeout": "5m",
-        "require": [
-            "esm"
-        ]
+        "timeout": "5m"
     },
     "nyc": {
         "all": true,