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                                <h1 id="plugins">Plugins</h1>
<p>Les stores Vuex prennent une option <code>plugins</code> qui expose des hooks pour chaque mutation. Un plugin Vuex est simplement une fonction qui re&#xE7;oit un store comme unique argument :</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">const</span> myPlugin <span class="token operator">=</span> store <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token comment" spellcheck="true">// appel&#xE9; quand le store est initialis&#xE9;</span>
  store<span class="token punctuation">.</span><span class="token function">subscribe</span><span class="token punctuation">(</span><span class="token punctuation">(</span>mutation<span class="token punctuation">,</span> state<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// appel&#xE9; apr&#xE8;s chaque mutation.</span>
    <span class="token comment" spellcheck="true">// Les mutations arrivent au format `{ type, payload }`.</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre>
<p>Et peut &#xEA;tre utilis&#xE9; ainsi :</p>
<pre class="language-"><code class="lang-js"><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>
  <span class="token comment" spellcheck="true">// ...</span>
  plugins<span class="token punctuation">:</span> <span class="token punctuation">[</span>myPlugin<span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<h3 id="acter-des-mutations-dans-des-plugins">Acter des mutations dans des plugins</h3>
<p>Les plugins ne sont pas autoris&#xE9;s &#xE0; muter directement l&apos;&#xE9;tat. Tout comme vos composants, ils peuvent simplement d&#xE9;clencher des changements en actant des mutations.</p>
<p>En actant des mutations, un plugin peut &#xEA;tre utilis&#xE9; pour synchroniser la source de donn&#xE9;es avec le store. Par exemple, pour synchroniser la source de donn&#xE9;es d&apos;une websocket vers le store (c&apos;est juste un exemple artificiel, en r&#xE9;alit&#xE9; la fonction <code>createPlugin</code> peut prendre des options additionnelles pour des t&#xE2;ches plus complexes) :</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">function</span> createWebSocketPlugin <span class="token punctuation">(</span>socket<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> store <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    socket<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">&apos;data&apos;</span><span class="token punctuation">,</span> data <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      store<span class="token punctuation">.</span><span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;receiveData&apos;</span><span class="token punctuation">,</span> data<span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
    store<span class="token punctuation">.</span><span class="token function">subscribe</span><span class="token punctuation">(</span>mutation <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>mutation<span class="token punctuation">.</span>type <span class="token operator">===</span> <span class="token string">&apos;UPDATE_DATA&apos;</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        socket<span class="token punctuation">.</span><span class="token function">emit</span><span class="token punctuation">(</span><span class="token string">&apos;update&apos;</span><span class="token punctuation">,</span> mutation<span class="token punctuation">.</span>payload<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>
<span class="token punctuation">}</span>
</code></pre>
<pre class="language-"><code class="lang-js"><span class="token keyword">const</span> plugin <span class="token operator">=</span> <span class="token function">createWebSocketPlugin</span><span class="token punctuation">(</span>socket<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>
  state<span class="token punctuation">,</span>
  mutations<span class="token punctuation">,</span>
  plugins<span class="token punctuation">:</span> <span class="token punctuation">[</span>plugin<span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<h3 id="prendre-des-instantan&#xE9;s-de-l&#xE9;tat">Prendre des instantan&#xE9;s de l&apos;&#xE9;tat</h3>
<p>Parfois un plugin peut vouloir recevoir des &#xAB; instantan&#xE9;s &#xBB; de l&apos;&#xE9;tat, et &#xE9;galement comparer l&apos;&#xE9;tat post mutation avec l&apos;&#xE9;tat pr&#xE9;mutation. Pour faire ceci, vous aurez besoin d&apos;effectuer une copie compl&#xE8;te de l&apos;&#xE9;tat :</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">const</span> myPluginWithSnapshot <span class="token operator">=</span> store <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> prevState <span class="token operator">=</span> _<span class="token punctuation">.</span><span class="token function">cloneDeep</span><span class="token punctuation">(</span>store<span class="token punctuation">.</span>state<span class="token punctuation">)</span>
  store<span class="token punctuation">.</span><span class="token function">subscribe</span><span class="token punctuation">(</span><span class="token punctuation">(</span>mutation<span class="token punctuation">,</span> state<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> nextState <span class="token operator">=</span> _<span class="token punctuation">.</span><span class="token function">cloneDeep</span><span class="token punctuation">(</span>state<span class="token punctuation">)</span>

    <span class="token comment" spellcheck="true">// comparer `prevState` et `nextState`...</span>

    <span class="token comment" spellcheck="true">// sauver l&apos;&#xE9;tat pour la prochaine mutation</span>
    prevState <span class="token operator">=</span> nextState
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre>
<p><strong>Les plugins qui peuvent prendre des instantan&#xE9;s ne devraient &#xEA;tre utilis&#xE9;s que pendant le d&#xE9;veloppement.</strong> Lorsqu&apos;on utilise webpack ou Browserify, on peut laisser nos outils de d&#xE9;veloppement (&#xAB; devtools &#xBB;) s&apos;occuper de &#xE7;a pour nous :</p>
<pre class="language-"><code class="lang-js"><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>
  <span class="token comment" spellcheck="true">// ...</span>
  plugins<span class="token punctuation">:</span> process<span class="token punctuation">.</span>env<span class="token punctuation">.</span>NODE_ENV <span class="token operator">!==</span> <span class="token string">&apos;production&apos;</span>
    <span class="token operator">?</span> <span class="token punctuation">[</span>myPluginWithSnapshot<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><span class="token punctuation">)</span>
</code></pre>
<p>Le plugin sera utilis&#xE9; par d&#xE9;faut. Pour la production, vous aurez besoin de <a href="https://webpack.js.org/plugins/define-plugin/" target="_blank">DefinePlugin</a> pour webpack ou de <a href="https://github.com/hughsk/envify" target="_blank">envify</a> pour Browserify pour convertir la valeur de <code>process.env.NODE_ENV !== &apos;production&apos;</code> &#xE0; <code>false</code> pour le build final.</p>
<h3 id="plugin-de-logs-int&#xE9;gr&#xE9;">Plugin de logs int&#xE9;gr&#xE9;</h3>
<blockquote>
<p>Si vous utilisez <a href="https://github.com/vuejs/vue-devtools" target="_blank">vue-devtools</a> vous n&apos;avez probablement pas besoin de &#xE7;a.</p>
</blockquote>
<p>Vuex fournit un plugin de logs &#xE0; des fins de d&#xE9;bogage :</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> createLogger <span class="token keyword">from</span> <span class="token string">&apos;vuex/dist/logger&apos;</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>
  plugins<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token function">createLogger</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>La fonction <code>createLogger</code> prend quelques options :</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">const</span> logger <span class="token operator">=</span> <span class="token function">createLogger</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  collapsed<span class="token punctuation">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// auto-expand logged mutations</span>
  filter <span class="token punctuation">(</span>mutation<span class="token punctuation">,</span> stateBefore<span class="token punctuation">,</span> stateAfter<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// retourne `true` si une mutation devrait &#xEA;tre loggu&#xE9;e</span>
    <span class="token comment" spellcheck="true">// `mutation` est un `{ type, payload }`</span>
    <span class="token keyword">return</span> mutation<span class="token punctuation">.</span>type <span class="token operator">!==</span> <span class="token string">&quot;aBlacklistedMutation&quot;</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  transformer <span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// transforme l&apos;&#xE9;tat avant de le logguer.</span>
    <span class="token comment" spellcheck="true">// retourne par exemple seulement un sous-arbre sp&#xE9;cifique</span>
    <span class="token keyword">return</span> state<span class="token punctuation">.</span>subTree
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  mutationTransformer <span class="token punctuation">(</span>mutation<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// les mutations sont loggu&#xE9;es au format `{ type, payload }`</span>
    <span class="token comment" spellcheck="true">// nous pouvons les formater comme nous le souhaitons.</span>
    <span class="token keyword">return</span> mutation<span class="token punctuation">.</span>type
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  logger<span class="token punctuation">:</span> console<span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// implementation de l&apos;API `console`, par d&#xE9;faut `console`</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>Le fichier de logs peut aussi &#xEA;tre inclus directement via une balise <code>script</code>, et exposera la fonction <code>createVuexLogger</code> globalement.</p>
<p>Notez que le plugin de logs peut prendre des instantan&#xE9;s de l&apos;&#xE9;tat, ne l&apos;utilisez donc que durant le d&#xE9;veloppement.</p>

                                
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