Method transition

src/ink/screen.ts:153–162

* Returns the pre-serialized ANSI string to transition from one style to * another. Cached by (fromId, toId) — zero allocations after first call * for a given pair.

(fromId: number, toId: number)

   * for a given pair.
   */
  transition(fromId: number, toId: number): string {
    if (fromId === toId) return ''
    const key = fromId * 0x100000 + toId
    let str = this.transitionCache.get(key)
    if (str === undefined) {
      str = ansiCodesToString(diffAnsiCodes(this.get(fromId), this.get(toId)))
      this.transitionCache.set(key, str)
    }
    return str
  }

  /**
   * Intern a style that is `base + inverse`. Cached by base ID so