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homeassistant-mcp/development/best-practices/index.html
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<article class="md-content__inner md-typeset">
<h1 id="development-best-practices">Development Best Practices</h1>
<p>This guide outlines the best practices for developing tools and features for the Home Assistant MCP.</p>
<h2 id="code-style">Code Style</h2>
<h3 id="typescript">TypeScript</h3>
<ol>
<li>Use TypeScript for all new code</li>
<li>Enable strict mode</li>
<li>Use explicit types</li>
<li>Avoid <code>any</code> type</li>
<li>Use interfaces over types</li>
<li>Document with JSDoc comments</li>
</ol>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="cm">/** </span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="cm"> * Represents a device in the system.</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="cm"> * @interface</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="cm"> */</span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="kd">interface</span><span class="w"> </span><span class="nx">Device</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="w"> </span><span class="cm">/** Unique device identifier */</span>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="w"> </span><span class="nx">id</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">;</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="w"> </span><span class="cm">/** Human-readable device name */</span>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="nx">name</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">;</span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="w"> </span><span class="cm">/** Device state */</span>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="w"> </span><span class="nx">state</span><span class="o">:</span><span class="w"> </span><span class="kt">DeviceState</span><span class="p">;</span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="p">}</span>
</code></pre></div>
<h3 id="naming-conventions">Naming Conventions</h3>
<ol>
<li>Use PascalCase for:</li>
<li>Classes</li>
<li>Interfaces</li>
<li>Types</li>
<li>
<p>Enums</p>
</li>
<li>
<p>Use camelCase for:</p>
</li>
<li>Variables</li>
<li>Functions</li>
<li>Methods</li>
<li>
<p>Properties</p>
</li>
<li>
<p>Use UPPER_SNAKE_CASE for:</p>
</li>
<li>Constants</li>
<li>Enum values</li>
</ol>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kd">class</span><span class="w"> </span><span class="nx">DeviceManager</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="w"> </span><span class="k">private</span><span class="w"> </span><span class="k">readonly</span><span class="w"> </span><span class="nx">DEFAULT_TIMEOUT</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">5000</span><span class="p">;</span>
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="nx">getDeviceState</span><span class="p">(</span><span class="nx">deviceId</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">)</span><span class="o">:</span><span class="w"> </span><span class="nb">Promise</span><span class="o">&lt;</span><span class="nx">DeviceState</span><span class="o">&gt;</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="c1">// Implementation</span>
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="p">}</span>
</code></pre></div>
<h2 id="architecture">Architecture</h2>
<h3 id="solid-principles">SOLID Principles</h3>
<ol>
<li>Single Responsibility</li>
<li>Each class/module has one job</li>
<li>
<p>Split complex functionality</p>
</li>
<li>
<p>Open/Closed</p>
</li>
<li>Open for extension</li>
<li>
<p>Closed for modification</p>
</li>
<li>
<p>Liskov Substitution</p>
</li>
<li>Subtypes must be substitutable</li>
<li>
<p>Use interfaces properly</p>
</li>
<li>
<p>Interface Segregation</p>
</li>
<li>Keep interfaces focused</li>
<li>
<p>Split large interfaces</p>
</li>
<li>
<p>Dependency Inversion</p>
</li>
<li>Depend on abstractions</li>
<li>Use dependency injection</li>
</ol>
<h3 id="example">Example</h3>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="c1">// Bad</span>
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="kd">class</span><span class="w"> </span><span class="nx">DeviceManager</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="nx">getState</span><span class="p">()</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="cm">/* ... */</span><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="nx">setState</span><span class="p">()</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="cm">/* ... */</span><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="nx">sendNotification</span><span class="p">()</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="cm">/* ... */</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="c1">// Wrong responsibility</span>
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="p">}</span>
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a>
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="c1">// Good</span>
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a><span class="kd">class</span><span class="w"> </span><span class="nx">DeviceManager</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="w"> </span><span class="kr">constructor</span><span class="p">(</span>
<a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a><span class="w"> </span><span class="k">private</span><span class="w"> </span><span class="nx">notifier</span><span class="o">:</span><span class="w"> </span><span class="kt">NotificationService</span>
<a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="p">{}</span>
<a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a>
<a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="nx">getState</span><span class="p">()</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="cm">/* ... */</span><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="nx">setState</span><span class="p">()</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="cm">/* ... */</span><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-16" name="__codelineno-2-16" href="#__codelineno-2-16"></a><span class="p">}</span>
<a id="__codelineno-2-17" name="__codelineno-2-17" href="#__codelineno-2-17"></a>
<a id="__codelineno-2-18" name="__codelineno-2-18" href="#__codelineno-2-18"></a><span class="kd">class</span><span class="w"> </span><span class="nx">NotificationService</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-19" name="__codelineno-2-19" href="#__codelineno-2-19"></a><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="nx">send</span><span class="p">()</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="cm">/* ... */</span><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-20" name="__codelineno-2-20" href="#__codelineno-2-20"></a><span class="p">}</span>
</code></pre></div>
<h2 id="error-handling">Error Handling</h2>
<h3 id="best-practices">Best Practices</h3>
<ol>
<li>Use custom error classes</li>
<li>Include error codes</li>
<li>Provide meaningful messages</li>
<li>Include error context</li>
<li>Handle async errors</li>
<li>Log appropriately</li>
</ol>
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="kd">class</span><span class="w"> </span><span class="nx">DeviceError</span><span class="w"> </span><span class="k">extends</span><span class="w"> </span><span class="ne">Error</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="w"> </span><span class="kr">constructor</span><span class="p">(</span>
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="w"> </span><span class="nx">message</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">,</span>
<a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="nx">code</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">,</span>
<a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="nx">context</span><span class="o">:</span><span class="w"> </span><span class="kt">Record</span><span class="o">&lt;</span><span class="kt">string</span><span class="p">,</span><span class="w"> </span><span class="nx">any</span><span class="o">&gt;</span>
<a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="w"> </span><span class="k">super</span><span class="p">(</span><span class="nx">message</span><span class="p">);</span>
<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="nx">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">&#39;DeviceError&#39;</span><span class="p">;</span>
<a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="p">}</span>
<a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a>
<a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="k">try</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a><span class="w"> </span><span class="k">await</span><span class="w"> </span><span class="nx">device</span><span class="p">.</span><span class="nx">connect</span><span class="p">();</span>
<a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></a><span class="p">}</span><span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(</span><span class="nx">error</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-3-15" name="__codelineno-3-15" href="#__codelineno-3-15"></a><span class="w"> </span><span class="k">throw</span><span class="w"> </span><span class="ow">new</span><span class="w"> </span><span class="nx">DeviceError</span><span class="p">(</span>
<a id="__codelineno-3-16" name="__codelineno-3-16" href="#__codelineno-3-16"></a><span class="w"> </span><span class="s1">&#39;Failed to connect to device&#39;</span><span class="p">,</span>
<a id="__codelineno-3-17" name="__codelineno-3-17" href="#__codelineno-3-17"></a><span class="w"> </span><span class="s1">&#39;DEVICE_CONNECTION_ERROR&#39;</span><span class="p">,</span>
<a id="__codelineno-3-18" name="__codelineno-3-18" href="#__codelineno-3-18"></a><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">deviceId</span><span class="o">:</span><span class="w"> </span><span class="kt">device.id</span><span class="p">,</span><span class="w"> </span><span class="nx">attempt</span><span class="o">:</span><span class="w"> </span><span class="kt">1</span><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-3-19" name="__codelineno-3-19" href="#__codelineno-3-19"></a><span class="w"> </span><span class="p">);</span>
<a id="__codelineno-3-20" name="__codelineno-3-20" href="#__codelineno-3-20"></a><span class="p">}</span>
</code></pre></div>
<h2 id="testing">Testing</h2>
<h3 id="guidelines">Guidelines</h3>
<ol>
<li>Write unit tests first</li>
<li>Use meaningful descriptions</li>
<li>Test edge cases</li>
<li>Mock external dependencies</li>
<li>Keep tests focused</li>
<li>Use test fixtures</li>
</ol>
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="nx">describe</span><span class="p">(</span><span class="s1">&#39;DeviceManager&#39;</span><span class="p">,</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="w"> </span><span class="kd">let</span><span class="w"> </span><span class="nx">manager</span><span class="o">:</span><span class="w"> </span><span class="kt">DeviceManager</span><span class="p">;</span>
<a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="w"> </span><span class="kd">let</span><span class="w"> </span><span class="nx">mockDevice</span><span class="o">:</span><span class="w"> </span><span class="kt">jest.Mocked</span><span class="o">&lt;</span><span class="nx">Device</span><span class="o">&gt;</span><span class="p">;</span>
<a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a>
<a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a><span class="w"> </span><span class="nx">beforeEach</span><span class="p">(()</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a><span class="w"> </span><span class="nx">mockDevice</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-4-7" name="__codelineno-4-7" href="#__codelineno-4-7"></a><span class="w"> </span><span class="nx">id</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;test_device&#39;</span><span class="p">,</span>
<a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a><span class="w"> </span><span class="nx">getState</span><span class="o">:</span><span class="w"> </span><span class="kt">jest.fn</span><span class="p">()</span>
<a id="__codelineno-4-9" name="__codelineno-4-9" href="#__codelineno-4-9"></a><span class="w"> </span><span class="p">};</span>
<a id="__codelineno-4-10" name="__codelineno-4-10" href="#__codelineno-4-10"></a><span class="w"> </span><span class="nx">manager</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">DeviceManager</span><span class="p">(</span><span class="nx">mockDevice</span><span class="p">);</span>
<a id="__codelineno-4-11" name="__codelineno-4-11" href="#__codelineno-4-11"></a><span class="w"> </span><span class="p">});</span>
<a id="__codelineno-4-12" name="__codelineno-4-12" href="#__codelineno-4-12"></a>
<a id="__codelineno-4-13" name="__codelineno-4-13" href="#__codelineno-4-13"></a><span class="w"> </span><span class="nx">it</span><span class="p">(</span><span class="s1">&#39;should get device state&#39;</span><span class="p">,</span><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-4-14" name="__codelineno-4-14" href="#__codelineno-4-14"></a><span class="w"> </span><span class="nx">mockDevice</span><span class="p">.</span><span class="nx">getState</span><span class="p">.</span><span class="nx">mockResolvedValue</span><span class="p">(</span><span class="s1">&#39;on&#39;</span><span class="p">);</span>
<a id="__codelineno-4-15" name="__codelineno-4-15" href="#__codelineno-4-15"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">state</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">await</span><span class="w"> </span><span class="nx">manager</span><span class="p">.</span><span class="nx">getDeviceState</span><span class="p">();</span>
<a id="__codelineno-4-16" name="__codelineno-4-16" href="#__codelineno-4-16"></a><span class="w"> </span><span class="nx">expect</span><span class="p">(</span><span class="nx">state</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">&#39;on&#39;</span><span class="p">);</span>
<a id="__codelineno-4-17" name="__codelineno-4-17" href="#__codelineno-4-17"></a><span class="w"> </span><span class="p">});</span>
<a id="__codelineno-4-18" name="__codelineno-4-18" href="#__codelineno-4-18"></a><span class="p">});</span>
</code></pre></div>
<h2 id="performance">Performance</h2>
<h3 id="optimization">Optimization</h3>
<ol>
<li>Use caching</li>
<li>Implement pagination</li>
<li>Optimize database queries</li>
<li>Use connection pooling</li>
<li>Implement rate limiting</li>
<li>Batch operations</li>
</ol>
<div class="highlight"><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="kd">class</span><span class="w"> </span><span class="nx">DeviceCache</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a><span class="w"> </span><span class="k">private</span><span class="w"> </span><span class="nx">cache</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="ow">new</span><span class="w"> </span><span class="nb">Map</span><span class="o">&lt;</span><span class="kt">string</span><span class="p">,</span><span class="w"> </span><span class="nx">CacheEntry</span><span class="o">&gt;</span><span class="p">();</span>
<a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a><span class="w"> </span><span class="k">private</span><span class="w"> </span><span class="k">readonly</span><span class="w"> </span><span class="nx">TTL</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">60000</span><span class="p">;</span><span class="w"> </span><span class="c1">// 1 minute</span>
<a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a>
<a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="nx">getDevice</span><span class="p">(</span><span class="nx">id</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">)</span><span class="o">:</span><span class="w"> </span><span class="nb">Promise</span><span class="o">&lt;</span><span class="nx">Device</span><span class="o">&gt;</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">cached</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="nx">cache</span><span class="p">.</span><span class="nx">get</span><span class="p">(</span><span class="nx">id</span><span class="p">);</span>
<a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="nx">cached</span><span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="nb">Date</span><span class="p">.</span><span class="nx">now</span><span class="p">()</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="nx">cached</span><span class="p">.</span><span class="nx">timestamp</span><span class="w"> </span><span class="o">&lt;</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="nx">TTL</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">cached</span><span class="p">.</span><span class="nx">device</span><span class="p">;</span>
<a id="__codelineno-5-9" name="__codelineno-5-9" href="#__codelineno-5-9"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-5-10" name="__codelineno-5-10" href="#__codelineno-5-10"></a>
<a id="__codelineno-5-11" name="__codelineno-5-11" href="#__codelineno-5-11"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">device</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">await</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="nx">fetchDevice</span><span class="p">(</span><span class="nx">id</span><span class="p">);</span>
<a id="__codelineno-5-12" name="__codelineno-5-12" href="#__codelineno-5-12"></a><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="nx">cache</span><span class="p">.</span><span class="nx">set</span><span class="p">(</span><span class="nx">id</span><span class="p">,</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-5-13" name="__codelineno-5-13" href="#__codelineno-5-13"></a><span class="w"> </span><span class="nx">device</span><span class="p">,</span>
<a id="__codelineno-5-14" name="__codelineno-5-14" href="#__codelineno-5-14"></a><span class="w"> </span><span class="nx">timestamp</span><span class="o">:</span><span class="w"> </span><span class="kt">Date.now</span><span class="p">()</span>
<a id="__codelineno-5-15" name="__codelineno-5-15" href="#__codelineno-5-15"></a><span class="w"> </span><span class="p">});</span>
<a id="__codelineno-5-16" name="__codelineno-5-16" href="#__codelineno-5-16"></a>
<a id="__codelineno-5-17" name="__codelineno-5-17" href="#__codelineno-5-17"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">device</span><span class="p">;</span>
<a id="__codelineno-5-18" name="__codelineno-5-18" href="#__codelineno-5-18"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-5-19" name="__codelineno-5-19" href="#__codelineno-5-19"></a><span class="p">}</span>
</code></pre></div>
<h2 id="security">Security</h2>
<h3 id="guidelines_1">Guidelines</h3>
<ol>
<li>Validate all input</li>
<li>Use parameterized queries</li>
<li>Implement rate limiting</li>
<li>Use proper authentication</li>
<li>Follow OWASP guidelines</li>
<li>Sanitize output</li>
</ol>
<div class="highlight"><pre><span></span><code><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="kd">class</span><span class="w"> </span><span class="nx">InputValidator</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a><span class="w"> </span><span class="k">static</span><span class="w"> </span><span class="nx">validateDeviceId</span><span class="p">(</span><span class="nx">id</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">)</span><span class="o">:</span><span class="w"> </span><span class="kt">boolean</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="sr">/^[a-zA-Z0-9_-]{1,64}$/</span><span class="p">.</span><span class="nx">test</span><span class="p">(</span><span class="nx">id</span><span class="p">);</span>
<a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-6-5" name="__codelineno-6-5" href="#__codelineno-6-5"></a>
<a id="__codelineno-6-6" name="__codelineno-6-6" href="#__codelineno-6-6"></a><span class="w"> </span><span class="k">static</span><span class="w"> </span><span class="nx">sanitizeOutput</span><span class="p">(</span><span class="nx">data</span><span class="o">:</span><span class="w"> </span><span class="kt">any</span><span class="p">)</span><span class="o">:</span><span class="w"> </span><span class="nx">any</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-6-7" name="__codelineno-6-7" href="#__codelineno-6-7"></a><span class="w"> </span><span class="c1">// Implement output sanitization</span>
<a id="__codelineno-6-8" name="__codelineno-6-8" href="#__codelineno-6-8"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">data</span><span class="p">;</span>
<a id="__codelineno-6-9" name="__codelineno-6-9" href="#__codelineno-6-9"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-6-10" name="__codelineno-6-10" href="#__codelineno-6-10"></a><span class="p">}</span>
</code></pre></div>
<h2 id="documentation">Documentation</h2>
<h3 id="standards">Standards</h3>
<ol>
<li>Use JSDoc comments</li>
<li>Document interfaces</li>
<li>Include examples</li>
<li>Document errors</li>
<li>Keep docs updated</li>
<li>Use markdown</li>
</ol>
<div class="highlight"><pre><span></span><code><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a><span class="cm">/**</span>
<a id="__codelineno-7-2" name="__codelineno-7-2" href="#__codelineno-7-2"></a><span class="cm"> * Manages device operations.</span>
<a id="__codelineno-7-3" name="__codelineno-7-3" href="#__codelineno-7-3"></a><span class="cm"> * @class</span>
<a id="__codelineno-7-4" name="__codelineno-7-4" href="#__codelineno-7-4"></a><span class="cm"> */</span>
<a id="__codelineno-7-5" name="__codelineno-7-5" href="#__codelineno-7-5"></a><span class="kd">class</span><span class="w"> </span><span class="nx">DeviceManager</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-7-6" name="__codelineno-7-6" href="#__codelineno-7-6"></a><span class="w"> </span><span class="cm">/**</span>
<a id="__codelineno-7-7" name="__codelineno-7-7" href="#__codelineno-7-7"></a><span class="cm"> * Gets the current state of a device.</span>
<a id="__codelineno-7-8" name="__codelineno-7-8" href="#__codelineno-7-8"></a><span class="cm"> * @param {string} deviceId - The device identifier.</span>
<a id="__codelineno-7-9" name="__codelineno-7-9" href="#__codelineno-7-9"></a><span class="cm"> * @returns {Promise&lt;DeviceState&gt;} The current device state.</span>
<a id="__codelineno-7-10" name="__codelineno-7-10" href="#__codelineno-7-10"></a><span class="cm"> * @throws {DeviceError} If device is not found or unavailable.</span>
<a id="__codelineno-7-11" name="__codelineno-7-11" href="#__codelineno-7-11"></a><span class="cm"> * @example</span>
<a id="__codelineno-7-12" name="__codelineno-7-12" href="#__codelineno-7-12"></a><span class="cm"> * const state = await deviceManager.getDeviceState(&#39;living_room_light&#39;);</span>
<a id="__codelineno-7-13" name="__codelineno-7-13" href="#__codelineno-7-13"></a><span class="cm"> */</span>
<a id="__codelineno-7-14" name="__codelineno-7-14" href="#__codelineno-7-14"></a><span class="w"> </span><span class="k">async</span><span class="w"> </span><span class="nx">getDeviceState</span><span class="p">(</span><span class="nx">deviceId</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">)</span><span class="o">:</span><span class="w"> </span><span class="nb">Promise</span><span class="o">&lt;</span><span class="nx">DeviceState</span><span class="o">&gt;</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-7-15" name="__codelineno-7-15" href="#__codelineno-7-15"></a><span class="w"> </span><span class="c1">// Implementation</span>
<a id="__codelineno-7-16" name="__codelineno-7-16" href="#__codelineno-7-16"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-7-17" name="__codelineno-7-17" href="#__codelineno-7-17"></a><span class="p">}</span>
</code></pre></div>
<h2 id="logging">Logging</h2>
<h3 id="best-practices_1">Best Practices</h3>
<ol>
<li>Use appropriate levels</li>
<li>Include context</li>
<li>Structure log data</li>
<li>Handle sensitive data</li>
<li>Implement rotation</li>
<li>Use correlation IDs</li>
</ol>
<div class="highlight"><pre><span></span><code><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a><span class="kd">class</span><span class="w"> </span><span class="nx">Logger</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a><span class="w"> </span><span class="nx">info</span><span class="p">(</span><span class="nx">message</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">,</span><span class="w"> </span><span class="nx">context</span><span class="o">:</span><span class="w"> </span><span class="kt">Record</span><span class="o">&lt;</span><span class="kt">string</span><span class="p">,</span><span class="w"> </span><span class="nx">any</span><span class="o">&gt;</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a><span class="w"> </span><span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nb">JSON</span><span class="p">.</span><span class="nx">stringify</span><span class="p">({</span>
<a id="__codelineno-8-4" name="__codelineno-8-4" href="#__codelineno-8-4"></a><span class="w"> </span><span class="nx">level</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;info&#39;</span><span class="p">,</span>
<a id="__codelineno-8-5" name="__codelineno-8-5" href="#__codelineno-8-5"></a><span class="w"> </span><span class="nx">message</span><span class="p">,</span>
<a id="__codelineno-8-6" name="__codelineno-8-6" href="#__codelineno-8-6"></a><span class="w"> </span><span class="nx">context</span><span class="p">,</span>
<a id="__codelineno-8-7" name="__codelineno-8-7" href="#__codelineno-8-7"></a><span class="w"> </span><span class="nx">timestamp</span><span class="o">:</span><span class="w"> </span><span class="kt">new</span><span class="w"> </span><span class="nb">Date</span><span class="p">().</span><span class="nx">toISOString</span><span class="p">(),</span>
<a id="__codelineno-8-8" name="__codelineno-8-8" href="#__codelineno-8-8"></a><span class="w"> </span><span class="nx">correlationId</span><span class="o">:</span><span class="w"> </span><span class="kt">context.correlationId</span>
<a id="__codelineno-8-9" name="__codelineno-8-9" href="#__codelineno-8-9"></a><span class="w"> </span><span class="p">}));</span>
<a id="__codelineno-8-10" name="__codelineno-8-10" href="#__codelineno-8-10"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-8-11" name="__codelineno-8-11" href="#__codelineno-8-11"></a><span class="p">}</span>
</code></pre></div>
<h2 id="version-control">Version Control</h2>
<h3 id="guidelines_2">Guidelines</h3>
<ol>
<li>Use meaningful commits</li>
<li>Follow branching strategy</li>
<li>Write good PR descriptions</li>
<li>Review code thoroughly</li>
<li>Keep changes focused</li>
<li>Use conventional commits</li>
</ol>
<div class="highlight"><pre><span></span><code><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a><span class="c1"># Good commit messages</span>
<a id="__codelineno-9-2" name="__codelineno-9-2" href="#__codelineno-9-2"></a>git<span class="w"> </span>commit<span class="w"> </span>-m<span class="w"> </span><span class="s2">&quot;feat(device): add support for zigbee devices&quot;</span>
<a id="__codelineno-9-3" name="__codelineno-9-3" href="#__codelineno-9-3"></a>git<span class="w"> </span>commit<span class="w"> </span>-m<span class="w"> </span><span class="s2">&quot;fix(api): handle timeout errors properly&quot;</span>
</code></pre></div>
<h2 id="see-also">See Also</h2>
<ul>
<li><a href="../tools/">Tool Development Guide</a></li>
<li><a href="../interfaces/">Interface Documentation</a></li>
<li><a href="../../testing/">Testing Guide</a> </li>
</ul>
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