動的なアセットを提供する

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イントロダクション

vue

<img :alt="image.alt" :src="`./assets/` + image.src" />

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GET http://localhost:3000/assets/afternoon.jpg 404 (Not Found)

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vue

<img :alt="image.alt" :src="require(`./assets/` + image.src)"./>

Viteでは、<script> ブロックの中に import ステートメントを記述することで、画像をインポートすることができます。

import imgUrl from './assets/img.png'

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オプションAPIの使用

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```
assets
└── images
    └── afternoon.jpg
```
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```
src
└── modules
    └── utils.js
```
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modules/utils.jsjs
```
const baseUrl = import.meta.env.BASE_URL

function getAsset (file) {
  if (!file) {
    return
  }
  const images = import.meta.globEager('/src/assets/images/*.{jpg,png,svg}')
  return images[`${baseUrl}src/assets/images/${file}`].default
}
```
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modules/utils.jsjs
```
function getStatic (file) {
  if (!file) {
    return
  }
  return '/static/' + file
}
```
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modules/utils.jsjs
```
export {
  getAsset,
  getStatic,
}
```

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App.vuevue

<script>
// オプション API で明示的なインポートを使用する
import { getAsset, getStatic } from '@/modules/utils'

export default {
  methods: {
    getAsset,
    getStatic
  }
}
</script>

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App.vuevue

<script>
export default {
  data () {
    return {
      images: {
        assets: [
          {
            src: 'afternoon.jpg',
            alt: 'afternoon'
          }
        ],
        public: [
          {
            src: 'nightfall.jpg',
            alt: 'afternoon'
          }
        ]
      }
    }
  }
}
</script>

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App.vuevue

<template>
  <ul>
    <li v-for="image in images.assets">
      <img :alt="image.alt" :src="getAsset(image.src)" />
    </li>
  </ul>

  <ul>
    <li v-for="image in images.public">
      <img :alt="image.alt" :src="getStatic(image.src)" />
    </li>
  </ul>
</template>

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グローバルミッスクインズの使用

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```
src
└── mixins
    └── utils.js
```

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mixins/utils.jsjs

import { getAsset, getStatic } from '@/modules/utils'

export default {
  methods: {
    getAsset,
    getStatic
  }
}

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main.jsjs

import { createApp } from 'vue'
import App from './App.vue'
import MixinsUtils from './mixins/utils'

createApp(App)
  .mixin(MixinsUtils)
  .mount('#app')

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App.vuevue

 <script>
  export default {
    data () {
      return {
        images: { ... }
      }
    }
  }
  </script>

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Composition APIを使う

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App.vuevue
```
<script>
export default {
  setup () {
    //...
  }
}
</script>
```
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App.vuevue

<script>
import { getAsset, getStatic } from '@/modules/utils'

export default {
  setup () {
    const images = { ... }

    return {
      images,
      getAsset,
      getStatic
    }
  }
}
</script>

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シングルファイルコンポーネント（SFC）`<script setup>`を使用する

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App.vuevue
```
<script setup>
//...
</script>
```
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App.vuevue
```
<script setup>
import { getAsset, getStatic } from '@/modules/utils'
const images = { ... }
</script>
```
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まとめ

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