Function isJSONable

isJSONable(input: unknown): input is { toJSON: (key?: string) => JsonValue }
Determine if input has a toJSON method that accepts zero or one arguments.
Parameters
- input: unknown
Returns input is { toJSON: (key?: string) => JsonValue }
Example
```
isJSONable(new Date()); // true
isJSONable({}); // false
```
- Defined in src/predicate/isJSONable.ts:12