Update TS/JS config files

Author: xenova

jsconfig.json

@@ -1,5 +1,10 @@
 {
+    // Only include files in the src directory
+    "include": [
+        "src/**/*"
+    ],
     "compilerOptions": {
+        // Tells the compiler to check JS files
         "checkJs": true
     }
-}
+}

tsconfig.json

@@ -0,0 +1,22 @@
+{
+    // Only include files in the src directory
+    "include": [
+        "src/**/*"
+    ],
+    "compilerOptions": {
+        // Tells TypeScript to read JS files, as
+        // normally they are ignored as source files
+        "allowJs": true,
+        // Generate d.ts files
+        "declaration": true,
+        // This compiler run should only output d.ts files
+        "emitDeclarationOnly": true,
+        // Types should go into this directory.
+        // Removing this would place the .d.ts files
+        // next to the .js files
+        "outDir": "types",
+        // go to js file when using IDE functions like
+        // "Go to Definition" in VSCode
+        "declarationMap": true
+    }
+}