/*** Make all properties in T optional.* typescript/lib/lib.es5.d.ts*/type Partial<T> = {[P in keyof T]?: T[P];};

/*** Make all properties in T required.* typescript/lib/lib.es5.d.ts*/type Required<T> = {[P in keyof T]-?: T[P];};

/*** Make all properties in T readonly.* typescript/lib/lib.es5.d.ts*/type Readonly<T> = {readonly [P in keyof T]: T[P];};

/*** Construct a type with a set of properties K of type T.* typescript/lib/lib.es5.d.ts*/type Record<K extends keyof any, T> = {[P in K]: T;};

/*** Exclude from T those types that are assignable to U.* typescript/lib/lib.es5.d.ts*/type Exclude<T, U> = T extends U ? never : T;

/*** Extract from T those types that are assignable to U.* typescript/lib/lib.es5.d.ts*/type Extract<T, U> = T extends U ? T : never;

/*** From T, pick a set of properties whose keys are in the union K.* typescript/lib/lib.es5.d.ts*/type Pick<T, K extends keyof T> = {[P in K]: T[P];};

/*** Construct a type with the properties of T except for those* in type K.* typescript/lib/lib.es5.d.ts*/type Omit<T, K extends keyof any> = Pick<T, Exclude<keyof T, K>>;

/*** Exclude null and undefined from T.* typescript/lib/lib.es5.d.ts*/type NonNullable<T> = T extends null | undefined ? never : T;

/*** Obtain the parameters of a function type in a tuple.* typescript/lib/lib.es5.d.ts*/type Parameters<T extends (...args: any) => any> = T extends(...args: infer P) => any ? P : never;

/*** Obtain the return type of a function type.* typescript/lib/lib.es5.d.ts*/type ReturnType<T extends (...args: any) => any> = T extends (...args: any) => infer R ? R : any;