Function isRaw

Type Guard checking for properties to exist. Workaround for microsoft/TypeScript#21732 to help to implement type guards checking subsequent property value types.

Example

const isEditorWithUI = <T extends Editor>(value: T): value is T & EditorWithUI => {
  // first see, if required keys are available
  if (isRaw<EditorWithUI>(value, "ui")) {
    // then check these keys if they pass the type-guard
    return typeof value.ui === "object";
  }
  return false;
};
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