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a utilies library reduce boilerplate for vuex
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Getters
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변이
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액션
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모듈
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애플리케이션 구조
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<a href="." >모듈</a>
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<h1 id="모듈">모듈</h1>
<p>단일 상태 트리를 사용하기 때문에 애플리케이션의 모든 상태가 하나의 큰 객체 안에 포함됩니다. 그러나 규모가 커짐에 따라 저장소는 매우 비대해질 수 있습니다.</p>
<p>이를 위해 Vuex는 저장소를 <strong>모듈</strong> 로 나눌 수 있습니다. 각 모듈은 자체 상태, 변이, 액션, 게터 및 심지어 중첩된 모듈을 포함 할 수 있습니다.</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">const</span> moduleA <span class="token operator">=</span> <span class="token punctuation">{</span>
state<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
actions<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
getters<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> moduleB <span class="token operator">=</span> <span class="token punctuation">{</span>
state<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
actions<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> store <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Vuex<span class="token punctuation">.</span>Store</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
modules<span class="token punctuation">:</span> <span class="token punctuation">{</span>
a<span class="token punctuation">:</span> moduleA<span class="token punctuation">,</span>
b<span class="token punctuation">:</span> moduleB
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
store<span class="token punctuation">.</span>state<span class="token punctuation">.</span>a <span class="token comment" spellcheck="true">// -> moduleA'의 상태</span>
store<span class="token punctuation">.</span>state<span class="token punctuation">.</span>b <span class="token comment" spellcheck="true">// -> moduleB'의 상태</span>
</code></pre>
<h3 id="지역-상태-모듈">지역 상태 모듈</h3>
<p>모듈의 변이와 getter 내부에서 첫 번째 전달인자는 <strong>모듈의 지역 상태</strong> 가됩니다.</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">const</span> moduleA <span class="token operator">=</span> <span class="token punctuation">{</span>
state<span class="token punctuation">:</span> <span class="token punctuation">{</span> count<span class="token punctuation">:</span> <span class="token number">0</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
increment <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">// state는 지역 모듈 상태 입니다</span>
state<span class="token punctuation">.</span>count<span class="token operator">++</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
doubleCount <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> state<span class="token punctuation">.</span>count <span class="token operator">*</span> <span class="token number">2</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>유사하게 모듈 내부에서 <code>context.state</code>는 지역 상태를 노출시킬 것이고 루트 상태는 <code>context.rootState</code>로 노출 될 것입니다.</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">const</span> moduleA <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">// ...</span>
actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
incrementIfOddOnRootSum <span class="token punctuation">(</span><span class="token punctuation">{</span> state<span class="token punctuation">,</span> commit<span class="token punctuation">,</span> rootState <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>count <span class="token operator">+</span> rootState<span class="token punctuation">.</span>count<span class="token punctuation">)</span> <span class="token operator">%</span> <span class="token number">2</span> <span class="token operator">===</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">'increment'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>또한, 모듈 getters 내부, 루트 상태는 그들의 세 번째 전달인자로 노출됩니다.</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">const</span> moduleA <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">// ...</span>
getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
sumWithRootCount <span class="token punctuation">(</span>state<span class="token punctuation">,</span> getters<span class="token punctuation">,</span> rootState<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> state<span class="token punctuation">.</span>count <span class="token operator">+</span> rootState<span class="token punctuation">.</span>count
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="네임스페이스">네임스페이스</h3>
<p>모듈 내의 액션, 변이 및 getter는 여전히 <strong>전역 네임 스페이스</strong> 아래에 등록됩니다. 여러 모듈이 동일한 변이/액션 유형에 반응 할 수 있습니다. 이름 앞에 접두사 또는 접미사를 붙이면 이름 충돌을 피하기 위해 모듈 자신의 네임스페이스를 직접 지정할 수 있습니다. 그리고 알 수 없는 환경에서 사용될 재사용 가능한 Vuex 모듈을 작성하는 경우라면 반드시 사용해야 합니다. 예를 들어,<code>todos</code> 모듈을 만들고 싶은 경우</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// types.js</span>
<span class="token comment" spellcheck="true">// getter, 액션, 변이의 이름을 상수로 정의하고</span>
<span class="token comment" spellcheck="true">// 모듈 이름 `todos` 접두어를 붙입니다</span>
<span class="token keyword">export</span> <span class="token keyword">const</span> DONE_COUNT <span class="token operator">=</span> <span class="token string">'todos/DONE_COUNT'</span>
<span class="token keyword">export</span> <span class="token keyword">const</span> FETCH_ALL <span class="token operator">=</span> <span class="token string">'todos/FETCH_ALL'</span>
<span class="token keyword">export</span> <span class="token keyword">const</span> TOGGLE_DONE <span class="token operator">=</span> <span class="token string">'todos/TOGGLE_DONE'</span>
</code></pre>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// modules/todos.js</span>
<span class="token keyword">import</span> <span class="token operator">*</span> <span class="token keyword">as</span> types <span class="token keyword">from</span> <span class="token string">'../types'</span>
<span class="token comment" spellcheck="true">// 접두어로 된 이름을 사용하여 getter, 액션 및 변이 정의</span>
<span class="token keyword">const</span> todosModule <span class="token operator">=</span> <span class="token punctuation">{</span>
state<span class="token punctuation">:</span> <span class="token punctuation">{</span> todos<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
getters<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token punctuation">[</span>types<span class="token punctuation">.</span>DONE_COUNT<span class="token punctuation">]</span> <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">// ...</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
actions<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token punctuation">[</span>types<span class="token punctuation">.</span>FETCH_ALL<span class="token punctuation">]</span> <span class="token punctuation">(</span>context<span class="token punctuation">,</span> payload<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">// ...</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
mutations<span class="token punctuation">:</span> <span class="token punctuation">{</span>
<span class="token punctuation">[</span>types<span class="token punctuation">.</span>TOGGLE_DONE<span class="token punctuation">]</span> <span class="token punctuation">(</span>state<span class="token punctuation">,</span> payload<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">// ...</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="동적-모듈-등록">동적 모듈 등록</h3>
<p><code>store.registerModule</code> 메소드로 저장소가 생성 된 <strong>후에</strong> 모듈을 등록 할 수 있습니다.</p>
<pre class="language-"><code class="lang-js">store<span class="token punctuation">.</span><span class="token function">registerModule</span><span class="token punctuation">(</span><span class="token string">'myModule'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">// ...</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>모듈의 상태는<code>store.state.myModule</code>으로 노출 됩니다.</p>
<p>동적 모듈 등록을 사용하면 다른 Vue 플러그인도 애플리케이션의 저장소에 모듈을 연결하여 상태 관리에 Vuex를 활용할 수 있습니다. 예를 들어 <a href="https://github.com/vuejs/vuex-router-sync" target="_blank"><code>vuex-router-sync</code></a> 라이브러리는 동적으로 연결된 모듈에서 애플리케이션의 라우트 상태를 관리하여 vue-router와 vuex를 통합합니다.</p>
<p><code>store.unregisterModule(moduleName)</code>을 사용하여 동적으로 등록 된 모듈을 제거할 수도 있습니다. 이 방법으로는 정적 모듈(저장소 생성시 선언 됨)을 제거 할 수 없습니다.</p>
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