Stricter Typescript

[sarink]

• Add "strict": true to tsconfig (https://www.typescriptlang.org/tsconfig#strict)
• Add requestIdleCallback window types and removes // ts-ignore statements
• Add null-checking around childRef.current (it's possible that a ref's current value is null)
• Use the built-in React.FunctionComponent<Props> type for the function
• In the case of noWrapper, since children could be an array, and an array is not a valid return type for a component, wrap them in a fragment <>{children}</>

[sarink]

@ScriptedAlchemy wanna check this one out instead?

[PascalPixel]

@hadeeb please fix these types, it just has to tell us that it returns a JSX.Element, at the moment it says it returns {}. 🙏

[Mati365]

bump, declare function LazyHydrate(props: Props): {}; returns wrong type