Typescript Utility Types

Partial

Constructs a type with all properties of T set to optional.

Required

Constructs a type consisting of all properties of T set to required.

Readonly

Constructs a type with all properties of T set to readonly.

**Record<K, T>**

Constructs a type with a set of properties K of type T.

**Pick<T, K>**

Constructs a type by picking the set of properties K from T.

**Omit<T, K>**

Constructs a type by omitting the set of properties K from T.

**Exclude<T, U>**

Constructs a type by excluding from T all properties that are assignable to U.

**Extract<T, U>**

Constructs a type by extracting from T all properties that are assignable to U.

**NonNullable<T>**

Constructs a type by excluding null and undefined from T.

**Parameters<T>**

Constructs a tuple type from the types used in the parameters of a function type T.

**ConstructorParameters<T>**

Constructs a tuple or array type from the types used in the parameters of a constructor type T.

**ReturnType<T>**

Constructs a type consisting of the return type of function type T.

**InstanceType<T>**

Constructs a type consisting of the instance type of a constructor function type T.

**ThisParameterType<T>**

Extracts the type of the this parameter for a function type, or unknown if the function type has no this parameter.

**OmitThisParameter<T>**

Removes the this parameter from a function type.

**ThisType<T>**

Marks an object type as being contextually this-typed.

**Uppercase<S>**

Constructs a string type by converting all characters in a string type S to uppercase.

**Lowercase<S>**

Constructs a string type by converting all characters in a string type S to lowercase.

**Capitalize<S>**

Constructs a string type by capitalizing the first character in a string type S.

**Uncapitalize<S>**

Constructs a string type by un-capitalizing the first character in a string type S.