Function isModifierKey

packages/hotkeys/src/parse.ts:242–246

(
  key: Key | (string & {}),
)

 * @returns True if the string is a recognized modifier
 */
export function isModifierKey(
  key: Key | (string & {}),
): key is keyof typeof MODIFIER_ALIASES {
  return key in MODIFIER_ALIASES || key.toLowerCase() in MODIFIER_ALIASES
}

/**
 * Parses a KeyboardEvent into a ParsedHotkey object.