16 - until - 使用watchEffect

[Gorvey]

<script setup lang="ts">
import { ref, watchEffect } from 'vue';

const count = ref(0);

/**
 * Implement the until function
 */

function until(initial) {
  function toBe(value) {
    return new Promise((resolve, reject) => {
      // 使用watchEffect订阅initial的变化
      const stop = watchEffect(() => {
        if (initial.value === value) {
          stop();
          resolve(true);
        }
      });
    });
  }

  return {
    toBe,
  };
}

async function increase() {
  count.value = 0;
  setInterval(() => {
    count.value++;
  }, 1000);
  await until(count).toBe(3);
  console.log(count.value === 3); // Make sure the output is true
}
</script>

<template>
  <p @click="increase">Increase</p>
</template>