Fix builtins syntax highlighting

runcode.ts

@@ -2,8 +2,13 @@
 const G: any = {
 	eval: eval,
 };
+// deno-lint-ignore no-explicit-any
+const builtins: any = {};
 const context = new Proxy(G, {
 	get: (target, prop) => {
+		if (prop in builtins) {
+			return builtins[prop as keyof typeof builtins];
+		}
 		return target[prop];
 	},
 	set: (target, prop, value) => {
@@ -43,9 +48,9 @@ export const evalCode = (code: string) => {
 
 // deno-lint-ignore no-explicit-any
 export const addToContext = (name: string, value: any) => {
-	G[name] = value;
+	builtins[name] = value;
 }
 
-export const getContext = () => {
-	return G;
+export const getBuiltins = () => {
+	return builtins;
 }