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class="VPLink link link" href="/sigpro/api/signal.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$ signals</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/watch.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$watch</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/if.html" data-v-a4b0d9bf><!--[--><p class="text" data-v-a4b0d9bf>$if</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-a4b0d9bf data-v-a4b0d9bf><div class="item" data-v-a4b0d9bf><div class="indicator" data-v-a4b0d9bf></div><a class="VPLink link link" href="/sigpro/api/for.html" 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data-v-3f927ebe><!--[--><!--]--></ul></div></nav><!--[--><!--]--><div class="spacer" data-v-6d7b3c46></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-83890dd9><div class="content-container" data-v-83890dd9><!--[--><!--]--><main class="main" data-v-83890dd9><div style="position:relative;" class="vp-doc _sigpro_api_watch" data-v-83890dd9><div><h1 id="⚡-reactivity-control-watch" tabindex="-1">⚡ Reactivity Control: <code>$watch( )</code> <a class="header-anchor" href="#⚡-reactivity-control-watch" aria-label="Permalink to "⚡ Reactivity Control: `$watch( )`""></a></h1><p>The <code>$watch</code> function is the reactive engine of SigPro. It allows you to execute code automatically when signals change. <code>$watch</code> is <strong>polymorphic</strong>: it can track dependencies automatically or follow an explicit list.</p><h2 id="🛠-function-signature" tabindex="-1">🛠 Function Signature <a class="header-anchor" href="#🛠-function-signature" aria-label="Permalink to "🛠 Function Signature""></a></h2><div class="language-typescript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">typescript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Automatic Mode (Magic Tracking)</span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$watch</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(callback: Function): StopFunction</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Explicit Mode (Isolated Dependencies)</span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$watch</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(deps: Signal[], callback: Function): StopFunction</span></span></code></pre></div><table tabindex="0"><thead><tr><th style="text-align:left;">Parameter</th><th style="text-align:left;">Type</th><th style="text-align:left;">Required</th><th style="text-align:left;">Description</th></tr></thead><tbody><tr><td style="text-align:left;"><strong><code>target / deps</code></strong></td><td style="text-align:left;"><code>Function</code></td><td style="text-align:left;"><code>Array</code></td><td style="text-align:left;">Yes</td></tr><tr><td style="text-align:left;"><strong><code>callback</code></strong></td><td style="text-align:left;"><code>Function</code></td><td style="text-align:left;">Only in Explicit</td><td style="text-align:left;">The code that will run when the <code>deps</code> change.</td></tr></tbody></table><p><strong>Returns:</strong> A <code>StopFunction</code> that, when called, destroys the watcher and releases memory.</p><hr><h2 id="📖-usage-patterns" tabindex="-1">📖 Usage Patterns <a class="header-anchor" href="#📖-usage-patterns" aria-label="Permalink to "📖 Usage Patterns""></a></h2><h3 id="_1-automatic-mode-default" tabindex="-1">1. Automatic Mode (Default) <a class="header-anchor" href="#_1-automatic-mode-default" aria-label="Permalink to "1. Automatic Mode (Default)""></a></h3><p>Any signal you "touch" inside the callback becomes a dependency. SigPro tracks them behind the scenes.</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> count</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$watch</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // Re-runs every time 'count' changes</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">`Count is: ${</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">count</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">()</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">}`</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">});</span></span></code></pre></div><h3 id="_2-explicit-mode-advanced-cleanup-🚀" tabindex="-1">2. Explicit Mode (Advanced Cleanup) 🚀 <a class="header-anchor" href="#_2-explicit-mode-advanced-cleanup-🚀" aria-label="Permalink to "2. Explicit Mode (Advanced Cleanup) 🚀""></a></h3><p>This mode <strong>isolates</strong> execution. The callback only triggers when the signals in the array change. Any other signal accessed <em>inside</em> the callback will NOT trigger a re-run. This is the "gold standard" for Routers and heavy components.</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> sPath</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"/home"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> user</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"Admin"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$watch</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">([sPath], () </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // Only triggers when 'sPath' changes.</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // Changes to 'user' will NOT trigger this, preventing accidental re-renders.</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">`Navigating to ${</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">sPath</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">()</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">} as ${</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">user</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">()</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">}`</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">});</span></span></code></pre></div><h3 id="_3-automatic-cleanup" tabindex="-1">3. Automatic Cleanup <a class="header-anchor" href="#_3-automatic-cleanup" aria-label="Permalink to "3. Automatic Cleanup""></a></h3><p>If your logic creates timers, event listeners, or other reactive effects, SigPro tracks them as "children" of the current watch. When the watcher re-runs or stops, it kills everything inside automatically.</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$watch</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> timer</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> setInterval</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"Tick"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">), </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">1000</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> </span></span>
|
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // Register a manual cleanup if needed</span></span>
|
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // Or simply rely on SigPro to kill nested $watch() calls</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> clearInterval</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(timer);</span></span>
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||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">});</span></span></code></pre></div><hr><h2 id="🛑-stopping-a-watcher" tabindex="-1">🛑 Stopping a Watcher <a class="header-anchor" href="#🛑-stopping-a-watcher" aria-label="Permalink to "🛑 Stopping a Watcher""></a></h2><p>Call the returned function to manually kill the watcher. This is essential for manual DOM injections (like Toasts) or long-lived background processes.</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> stop</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $watch</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">count</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()));</span></span>
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<span class="line"></span>
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||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Later...</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">stop</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(); </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// The link between the signal and this code is physically severed.</span></span></code></pre></div><hr><h2 id="💡-pro-tip-the-microtask-queue" tabindex="-1">💡 Pro Tip: The Microtask Queue <a class="header-anchor" href="#💡-pro-tip-the-microtask-queue" aria-label="Permalink to "💡 Pro Tip: The Microtask Queue""></a></h2><p>SigPro batches updates. If you update multiple signals in the same execution block, the watcher will only fire <strong>once</strong> at the end of the task.</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> a</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
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||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> b</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> $</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">$watch</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">a</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(), </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">b</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()));</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// This triggers only ONE re-run.</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">a</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">b</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">2</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-83890dd9 data-v-4f9813fa><!--[--><!--]--><!----><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-4f9813fa><span class="visually-hidden" id="doc-footer-aria-label" data-v-4f9813fa>Pager</span><div class="pager" data-v-4f9813fa><a class="VPLink link pager-link prev" href="/sigpro/api/signal.html" data-v-4f9813fa><!--[--><span class="desc" data-v-4f9813fa>Previous page</span><span class="title" data-v-4f9813fa>$ signals</span><!--]--></a></div><div class="pager" data-v-4f9813fa><a class="VPLink link pager-link next" href="/sigpro/api/if.html" data-v-4f9813fa><!--[--><span class="desc" data-v-4f9813fa>Next page</span><span class="title" data-v-4f9813fa>$if</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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