add PropTypes.exact (#27996)

types/prop-types/index.d.ts

@@ -47,6 +47,7 @@ export function oneOfType<T extends Validator<any>>(types: T[]): Requireable<Non
 export function arrayOf<T>(type: Validator<T>): Requireable<T[]>;
 export function objectOf<T>(type: Validator<T>): Requireable<{ [K in keyof any]: T; }>;
 export function shape<P extends ValidationMap<any>>(type: P): Requireable<InferProps<P>>;
+export function exact<P extends ValidationMap<any>>(type: P): Requireable<Required<InferProps<P>>>;
 
 /**
  * Assert that the values match with the type specs.

types/react/index.d.ts

@@ -2228,6 +2228,7 @@ declare namespace React {
         arrayOf: typeof PropTypes.arrayOf;
         objectOf: typeof PropTypes.objectOf;
         shape: typeof PropTypes.shape;
+        exact: typeof PropTypes.exact;
     }
 
     //