Create console.ts

console.ts

@@ -0,0 +1,34 @@
+
+type Mapping = {
+  [Key in "d" | "i" | "f"]: number
+} & 
+{s: string} &
+{[Key in "o" | "O"]: object};
+
+type AddMappedToArray<ArgsArray extends any[], Char> = 
+  Char extends keyof Mapping ? [...ArgsArray, Mapping[Char]] : ArgsArray;
+
+type FirstChar<T extends string> = T extends `${infer Head}${string}` ? Head : T;
+
+type ArgsFromPlaceholder<
+  RemainingString extends string,
+  ArgsArray extends any[] = []
+> = RemainingString extends `${infer Head}${infer Tail}`
+  ? Head extends "%"
+    ? ArgsFromPlaceholder<Tail, AddMappedToArray<ArgsArray, FirstChar<Tail>>>
+    : ArgsFromPlaceholder<Tail, ArgsArray>
+  : [...ArgsArray, ...args: any[]];
+
+type BaseTypes = string | number | object | bigint | boolean | symbol | null | undefined;
+
+type OptionalParams<Input> = Input extends string ? ArgsFromPlaceholder<Input> : any[];
+
+declare var console: Omit<Console, 'log'> & {
+  log<T extends BaseTypes>(
+    message?: T, ...optionalParams: OptionalParams<T>
+  ): void;
+}
+
+console.log("%s %d, YouTube", "Hi", 5);
+
+console.log("Hi %d, %s", "Five", "YouTube");