Disable source map generation in TypeScript build

Author: jdalton

tsconfig.base.json

@@ -26,7 +26,7 @@
     "resolveJsonModule": true,
     "rewriteRelativeImportExtensions": true,
     "skipLibCheck": true,
-    "sourceMap": true,
+    "sourceMap": false,
     "strict": true,
     "strictNullChecks": true,
     "target": "esnext",