类型守卫

主要用于TypeScript类型缩小或者类型断言

isDef

类型守卫 undefined

• 类型

  <T = unknown>(val?: T | undefined) => val is undefined;

isUnDef

类型守卫 非 undefined

• 类型

  <T = unknown>(val?: T | undefined) => val is T;

isNull

类型守卫 null

• 类型

  (val: unknown) => val is null;

isNullOrUnDef

类型守卫 null 或 undefined

• 类型

  (val: unknown) => val is null | undefined;

isObject

类型守卫 object

• 类型

  (val: any) => val is Record<any, any>;

isNumber

类型守卫 number

• 类型

  (val: unknown) => val is number;

isDate

类型守卫 date

• 类型

  (val: unknown) => val is Date;

isPromise

类型守卫 promise

• 类型

  <T = any>(val: any) => val is Promise<T>;

isString

类型守卫 string

• 类型

  (val: unknown) => val is string;

isFunction

类型守卫 function

• 类型

  (val: unknown) => val is Function;

isBoolean

类型守卫 boolean

• 类型

  (val: unknown) => val is boolean;

isRegExp

类型守卫 RegExp

• 类型

  (val: unknown) => val is RegExp;

isArray

类型守卫 array

• 类型

  (val: any) => val is any[];

isWindow

类型守卫 Window

• 类型

  (val: any) => val is Window;

isElement

类型守卫 Element

• 类型

  (val: unknown) => val is Element;

isMap

类型守卫 Map

• 类型

  (val: unknown) => val is Map<any, any>;

isEmpty

类型守卫 空值

• 类型

  <T = unknown>(val: T) => val is T;