Function cache

packages/compiler-core/src/transform.ts:303–312

(exp, isVNode = false, inVOnce = false)

      return identifier
    },
    cache(exp, isVNode = false, inVOnce = false) {
      const cacheExp = createCacheExpression(
        context.cached.length,
        exp,
        isVNode,
        inVOnce,
      )
      context.cached.push(cacheExp)
      return cacheExp
    },
  }

  if (__COMPAT__) {