Use builtin types

src/core/client/framework/types.ts

@@ -1,2 +1,2 @@
 // TODO: (@cvle) Extract useful common types into its own package.
-export { Diff, Omit, Overwrite, PropTypesOf } from "talk-ui/types";
+export { Omit, Overwrite, PropTypesOf } from "talk-ui/types";

src/core/client/ui/types.ts

@@ -2,27 +2,19 @@ import React from "react";
 
 // TODO: Extract useful common types into its own package.
 
-/**
- * Returns literals types that are in T but not in U.
- *
- * E.g. Diff<"a" | "b", "a"> = "b"
- */
-export type Diff<T extends keyof any, U extends keyof any> = ({ [P in T]: P } &
-  { [P in U]: never } & { [x: string]: never; [x: number]: never })[T];
-
 /**
  * Overwrite properties of `T`.
  *
  * E.g. Omit<{a: boolean, b: boolean}, "b"> = {a: boolean}
  */
-export type Omit<U, K extends keyof U> = Pick<U, Diff<keyof U, K>>;
+export type Omit<U, K extends keyof U> = Pick<U, Exclude<keyof U, K>>;
 
 /**
  * Overwrite properties of `T`.
  *
  * E.g. Overwrite<{a: boolean}, {a: string}> = {a: string}
  */
-export type Overwrite<T, U> = Pick<T, Diff<keyof T, keyof U>> & U;
+export type Overwrite<T, U> = Pick<T, Exclude<keyof T, keyof U>> & U;
 
 /**
  * Returns the PropTypes from a React Component.