Function withOptionalKey

packages/jsx/src/components.ts:172–180

(
  props: Omit<P, "key">,
  key: string | undefined,
)

type GridPropsWithOptionalKey = GridProps & { key?: string };

function withOptionalKey<P extends { key?: string }>(
  props: Omit<P, "key">,
  key: string | undefined,
): P {
  if (key === undefined) {
    return props as P;
  }
  return { ...props, key } as P;
}

function withVNodeKey<N extends VNode>(vnode: N, key: string | undefined): N {
  if (key === undefined) {