The operator checks a value against a type without widening it, which is exactly what a configuration object needs and nothing else does as well. An annotation checks…
The March release implements the stage 3 proposal, which is a different feature from the flag that has been in the language since 2015. The two cannot be…
A function taking an array of strings receives string[], losing the literal types, unless the caller writes as const every time. Moving the assertion from every call site…
A filter input rendering 4,000 rows on every keystroke, where the typing lag was the rendering rather than the filtering. The input updates immediately and the list update…
Subscribing to an external store with useEffect and useState tears under concurrent rendering, which is what this hook exists to prevent. The snapshot function must return a cached…
Development mode mounting, unmounting and remounting every component is a diagnostic, and the double-fetch it produces is the diagnosis rather than the bug. An effect that cannot survive…
Wrapping an error in a more meaningful one used to discard the original, or required a non-standard property that nothing displayed. The tracker support lagging is the practical…