Function isOn

packages/shared/src/general.ts:15–19

(key: string)

export const NO = () => false

export const isOn = (key: string): boolean =>
  key.charCodeAt(0) === 111 /* o */ &&
  key.charCodeAt(1) === 110 /* n */ &&
  // uppercase letter
  (key.charCodeAt(2) > 122 || key.charCodeAt(2) < 97)

export const isModelListener = (key: string): key is `onUpdate:${string}` =>
  key.startsWith('onUpdate:')