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  <section id="prefab-code-generation">
<h1>Prefab code generation<a class="headerlink" href="#prefab-code-generation" title="Link to this heading"></a></h1>
<p>A <a class="reference external" href="../scene-editor/prefabs.html">prefab</a> file is a scene and is compiled into JavaScript (or TypeScript) code. A regular scene file is compiled into a class that extends the <a class="reference external" href="https://photonstorm.github.io/phaser3-docs/Phaser.Scene.html">Phaser.Scene</a> class. It is a scene after all. However, the <a class="reference external" href="../scene-editor/prefabs.html">prefab</a> file is compiled into a custom object class.</p>
<p>The <a class="reference external" href="../scene-editor/prefabs.html">prefab</a> class generated by the <a class="reference external" href="../scene-editor/scene-compiler.html">scene compiler</a> extends a game object class, like an <a class="reference external" href="image-object.html">Image</a>, a <a class="reference external" href="bitmap-text-object.html">BitmapText</a>, etc… or <a class="reference external" href="prefab-variant.html">another prefab class</a>.</p>
<p>This is the code generated after compile the <strong>Dragon</strong> prefab:</p>
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">class</span><span class="w"> </span><span class="nx">Dragon</span><span class="w"> </span><span class="k">extends</span><span class="w"> </span><span class="nx">Phaser</span><span class="p">.</span><span class="nx">GameObjects</span><span class="p">.</span><span class="nx">Image</span><span class="w"> </span><span class="p">{</span>

<span class="w">    </span><span class="kr">constructor</span><span class="p">(</span><span class="nx">scene</span><span class="p">,</span><span class="w"> </span><span class="nx">x</span><span class="p">,</span><span class="w"> </span><span class="nx">y</span><span class="p">,</span><span class="w"> </span><span class="nx">texture</span><span class="p">,</span><span class="w"> </span><span class="nx">frame</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">super</span><span class="p">(</span><span class="nx">scene</span><span class="p">,</span><span class="w"> </span><span class="nx">x</span><span class="w"> </span><span class="o">??</span><span class="w"> </span><span class="mf">100</span><span class="p">,</span><span class="w"> </span><span class="nx">y</span><span class="w"> </span><span class="o">??</span><span class="w"> </span><span class="mf">100</span><span class="p">,</span><span class="w"> </span><span class="nx">texture</span><span class="w"> </span><span class="o">||</span><span class="w"> </span><span class="s2">&quot;dragon&quot;</span><span class="p">,</span><span class="w"> </span><span class="nx">frame</span><span class="w"> </span><span class="o">??</span><span class="w"> </span><span class="s2">&quot;dragon/flamming_00&quot;</span><span class="p">);</span>

<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">scaleX</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0.7</span><span class="p">;</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">scaleY</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0.7</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Note the <a class="reference external" href="../scene-editor/prefabs.html">prefab</a> class extends the <a class="reference external" href="https://photonstorm.github.io/phaser3-docs/Phaser.GameObjects.Image.html">Phaser.GameObjects.Image</a> class, because the <a class="reference external" href="prefab-object.html">prefab object</a> is an <a class="reference external" href="image-object.html">Image</a>.</p>
<p>The constructor of the <strong>Dragon</strong> class has the same arguments of the <a class="reference external" href="image-object.html">Image</a> class, but by default, it uses the texture set in the <a class="reference external" href="prefab-object.html">prefab object</a>. Also, in the body of the constructor, are set the properties modified in the <a class="reference external" href="prefab-object.html">prefab object</a>:</p>
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="k">this</span><span class="p">.</span><span class="nx">scaleX</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0.7</span><span class="p">;</span>
<span class="k">this</span><span class="p">.</span><span class="nx">scaleY</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0.7</span><span class="p">;</span>
</pre></div>
</div>
<p>When the <a class="reference external" href="../scene-editor/scene-compiler.html">scene compiler</a> compiles a regular scene file, the <a class="reference external" href="../scene-editor/prefab-create-instance.html">prefab instances</a> in it are generated as instances of the <a class="reference external" href="../scene-editor/prefabs.html">prefab</a> class:</p>
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">class</span><span class="w"> </span><span class="nx">Level</span><span class="w"> </span><span class="k">extends</span><span class="w"> </span><span class="nx">Phaser</span><span class="p">.</span><span class="nx">Scene</span><span class="w"> </span><span class="p">{</span>

<span class="w">    </span><span class="kr">constructor</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">super</span><span class="p">(</span><span class="s2">&quot;Level&quot;</span><span class="p">);</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nx">create</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="p">...</span>

<span class="w">        </span><span class="c1">// create the instance of the Dragon prefab class</span>
<span class="w">        </span><span class="kd">const</span><span class="w"> </span><span class="nx">dragon</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="ow">new</span><span class="w"> </span><span class="nx">Dragon</span><span class="p">(</span><span class="k">this</span><span class="p">,</span><span class="w"> </span><span class="mf">190</span><span class="p">,</span><span class="w"> </span><span class="mf">120</span><span class="p">);</span>
<span class="w">        </span><span class="c1">// add the instance to the display list</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">add</span><span class="p">.</span><span class="nx">existing</span><span class="p">(</span><span class="nx">dragon</span><span class="p">);</span>
<span class="w">        </span><span class="c1">// modify the &#39;angle&#39; property of the instance</span>
<span class="w">        </span><span class="nx">dragon</span><span class="p">.</span><span class="nx">angle</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">-</span><span class="mf">30</span><span class="p">;</span>
<span class="w">        </span><span class="p">...</span>
<span class="w">    </span><span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Also, the <a class="reference external" href="../scene-editor/prefabs.html">prefab</a> class can be instantiated manually by you, at any time in your game. It is just a custom object class that looks like if you write it by hand.</p>
</section>


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