isArray()

function isArray(data): data is unknown[]

Parameters

Parameter	Type
data	unknown

Returns

data is unknown[]

---

isBigInt()

function isBigInt(data): data is bigint

Parameters

Parameter	Type
data	unknown

Returns

data is bigint

---

isBoolean()

function isBoolean(data): data is boolean

Parameters

Parameter	Type
data	unknown

Returns

data is boolean

---

isFunction()

function isFunction(data): data is Function

Parameters

Parameter	Type
data	unknown

Returns

data is Function

---

isNonEmptyArray()

function isNonEmptyArray<T>(data): data is [T, ...T[]]

Use this when the data that you want to guard is already a known array

Type Parameters

Type Parameter
T

Parameters

Parameter	Type	Description
data	T[]	an array

Returns

data is [T, ...T[]]

true if data has at least one element

---

isNull()

function isNull(data): data is null

Parameters

Parameter	Type
data	unknown

Returns

data is null

---

isNumber()

function isNumber(data): data is number

Parameters

Parameter	Type
data	unknown

Returns

data is number

---

isObject()

function isObject(data): data is object

Parameters

Parameter	Type
data	unknown

Returns

data is object

---

isString()

function isString(data): data is string

Parameters

Parameter	Type
data	unknown

Returns

data is string

---

isSymbol()

function isSymbol(data): data is symbol

Parameters

Parameter	Type
data	unknown

Returns

data is symbol

---

isUndefined()

function isUndefined(data): data is undefined

Parameters

Parameter	Type
data	unknown

Returns

data is undefined