assertMap()function

assertMap(value: unknown, caller: AnyCaller = assertMap): asserts value is ImmutableMap

Param	Type
`value`	`unknown`	The value to assert. required
`caller`	`AnyCaller`	Function used to attribute a thrown error to the calling site. Defaults to `assertMap`

Return
`asserts value is ImmutableMap`	Nothing; narrows `value` to `ImmutableMap`.

Throws
`RequiredError`	If `value` is not a `Map` instance.

Assert that a value is a Map instance.

Examples

assertMap(new Map()); // passes