@flowio/is v0.1.0
@flowio/is
A JavaScript type testing library
Installation
npm install @flowio/isAPI Reference
type AnyFunction = (...args: any[]) => any
type EmptyArray = never[]
type EmptyPlainObject = { [key: string]: never }
type PlainObject = { [key: string]: unknown }
isArguments(value?: unknown): value is ArrayLike<unknown>
Returns whether the given value is an argument object.
isArray(value?: unknown): value is unknown[]
Returns whether the given value is an array.
isBoolean(value?: unknown): value is boolean
Returns whether the given value is a boolean.
isDate(value?: unknown): value is Date
Returns whether the given value is a date.
isEmpty(value?: unknown): boolean
Returns whether the given value is empty.
isEmptyArray(value?: unknown): value is EmptyArray
Returns whether the given value is an empty array
isEmptyPlainObject(value?: unknown): value is EmptyPlainObject
Returns whether the given value is an empty plain object
isEmptyString(value?: unknown): boolean
Returns whether the given value is an empty string
isError(value?: unknown): value is Error
Returns whether the given value is an error object.
isFunction(value?: unknown): value is AnyFunction
Returns whether the given value is a function.
isNil(value?: unknown): value is null | undefined
Returns whether the given value is null or undefined.
isNotNil<T>(value: T | null | undefined): value is T
Returns whether the given value is not null or undefined.
isNull(value?: unknown): value is null
Returns whether the given value is null.
isNumber(value?: unknown): value is number
Returns whether the given value is a number, excluding NaN values.
isObject(value?: unknown): value is object
Returns whether the given value is any kind of object, including special classes or objects with different prototypes.
isPlainObject(value?: unknown): value is PlainObject
Returns whether the given value is a plain object, excluding special classes or objects with different prototypes.
isRegExp(value?: unknown): value is RegExp
Returns whether the given value is a regular expression.
isString(value?: unknown): value is string
Returns whether the given value is a string.
isUndefined(value?: unknown): value is undefined
Returns whether the given value is undefined.