Add a tsconfig to /devEnv

Now that /devEnv has more than one typescript file, it should have its own typescript project

.eslintrc.js

@@ -51,6 +51,7 @@ module.exports = {
           './packages/*/tsconfig.json',
           './packages/*/devEnv/tsconfig.json',
           './examples/*/tsconfig.json',
+          './devEnv/tsconfig.json',
         ],
       },
       rules: {

devEnv/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "extends": "../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "dist",
+    "lib": ["ESNext", "DOM"],
+    "rootDir": ".",
+    "types": ["node"],
+    "noEmit": true,
+    "target": "es6",
+    "composite": true
+  }
+}