isFormData

Checks if a value is a FormData instance.

Useful for filtering or type-narrowing in a functional pipeline: values.filter(isFormData)

Available since v2.0.0

Import

import { isFormData } from '@helpers4/guard';

Signature

isFormData(value: unknown): value is FormData

Parameters

Parameter	Type	Description
value	unknown	The value to check

Returns

value is FormData — True if value is a FormData

Examples

Detect a FormData

Returns true only for FormData instances.

isFormData(new FormData()) // => true
isFormData({})             // => false
isFormData(null)           // => false

Filter FormData from a mixed array

Use as a predicate in .filter() to extract FormData values.

const fd = new FormData();
fd.append('name', 'Alice');
const values = [fd, {}, new FormData(), 'text'];
values.filter(isFormData)
// => [FormData, FormData]

Source

View source on GitHub