/** Parent options accept --flag=value. Tokens after -- belong to the child. */
export function normalizeParentArgv(input: readonly string[]): {
  args: string[];
  runtimeArgs: string[];
} {
  const boundary = input.indexOf("--");
  const runtimeArgs = input
    .slice(0, boundary < 0 ? undefined : boundary)
    .flatMap((arg) => {
      const split = arg.startsWith("--") ? arg.indexOf("=") : -1;
      return split > 2 ? [arg.slice(0, split), arg.slice(split + 1)] : [arg];
    });
  return {
    runtimeArgs,
    args:
      boundary < 0
        ? [...runtimeArgs]
        : [...runtimeArgs, ...input.slice(boundary)],
  };
}