Function isModifier

modules/tinymce/src/core/main/ts/api/Shortcuts.ts:70–71

(key: string)

type CommandFunc = string | [string, boolean, any] | (() => void);

const isModifier = (key: string): key is keyof ModifierMap =>
  key in modifierNames;

const parseShortcut = (pattern: string): Shortcut => {
  const shortcut = {} as Shortcut;