Disable "preserveConstEnums" in tsconfig (#2440)

Author: MaxGraey

scripts/build.js

@@ -145,17 +145,17 @@ const diagnosticsPlugin = {
         }
         out.push("  " + key + " = " + messages[text]);
       });
-      
+
       out.push("\n}\n\n");
       out.push("/** Translates a diagnostic code to its respective string. */\n");
       out.push("export function diagnosticCodeToString(code: DiagnosticCode): string {\n  switch (code) {\n");
-      
+
       Object.keys(messages).forEach(text => {
         out.push("    case " + messages[text] + ": return " + JSON.stringify(text) + ";\n");
       });
-      
+
       out.push("    default: return \"\";\n  }\n}\n");
-      
+
       const generated = out.join("");
       fs.writeFileSync(path.join(dirname, "..", "src", "diagnosticMessages.generated.ts"), generated);
       return {

std/portable.json

@@ -4,8 +4,6 @@
     "target": "esnext",
     "module": "commonjs",
     "allowJs": true,
-    "downlevelIteration": true,
-    "preserveConstEnums": true,
     "typeRoots": [ "types" ],
     "types": [ "portable" ],
     "lib": ["esnext", "esnext.string"]

tsconfig-base.json

@@ -1,11 +1,14 @@
 {
   "compilerOptions": {
+    "strict": true,
     "alwaysStrict": true,
     "noImplicitAny": true,
     "noImplicitReturns": true,
     "noImplicitThis": true,
     "noEmitOnError": true,
     "strictNullChecks": true,
-    "experimentalDecorators": true
+    "experimentalDecorators": true,
+    "preserveConstEnums": false,
+    "downlevelIteration": true
   }
 }