_fnOpt
_fnOpt<
T>(name,fn): (arg) =>boolean
Defined in: src/backends/backend.ts:120
Internal
Use a function as the type of an option, but don’t treat it as a class.
Optionally sets the name of a function, useful for error messages.
Type Parameters
Section titled “Type Parameters”T
Parameters
Section titled “Parameters”string | null | undefined
(arg) => boolean
Returns
Section titled “Returns”(arg) => boolean