<pre><code class="ts"><span class="hl-4">export</span><span class="hl-1"> </span><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-0">Core</span><span class="hl-1"> = ({ </span><span class="hl-5">t</span><span class="hl-1">, </span><span class="hl-5">nonce</span><span class="hl-1">, </span><span class="hl-5">k</span><span class="hl-1"> = </span><span class="hl-2">"o"</span><span class="hl-1"> }: </span><span class="hl-8">CoreProps</span><span class="hl-1">) </span><span class="hl-6">=></span><span class="hl-1"> {</span><br/><span class="hl-1">  </span><span class="hl-3">// handle client side exceptions when script is not run. <- for client side apps like vite or CRA</span><br/><span class="hl-1">  </span><span class="hl-4">if</span><span class="hl-1"> (</span><span class="hl-6">typeof</span><span class="hl-1"> </span><span class="hl-5">window</span><span class="hl-1"> !== </span><span class="hl-2">"undefined"</span><span class="hl-1"> && !</span><span class="hl-5">window</span><span class="hl-1">.</span><span class="hl-5">m</span><span class="hl-1">) </span><span class="hl-0">noFOUCScript</span><span class="hl-1">(</span><span class="hl-5">k</span><span class="hl-1">);</span><br/><br/><span class="hl-1">  </span><span class="hl-6">const</span><span class="hl-1"> [{ </span><span class="hl-5">m</span><span class="hl-1">: </span><span class="hl-13">mode</span><span class="hl-1">, </span><span class="hl-5">s</span><span class="hl-1">: </span><span class="hl-13">systemMode</span><span class="hl-1"> }, </span><span class="hl-13">setThemeState</span><span class="hl-1">] = </span><span class="hl-0">useStore</span><span class="hl-1">();</span><br/><br/><span class="hl-1">  </span><span class="hl-0">useEffect</span><span class="hl-1">(() </span><span class="hl-6">=></span><span class="hl-1"> {</span><br/><span class="hl-1">    </span><span class="hl-3">// store global functions to local variables to avoid any interference</span><br/><span class="hl-1">    [</span><span class="hl-5">media</span><span class="hl-1">, </span><span class="hl-5">updateDOM</span><span class="hl-1">] = [</span><span class="hl-5">m</span><span class="hl-1">, </span><span class="hl-5">u</span><span class="hl-1">];</span><br/><span class="hl-1">    </span><span class="hl-3">/** Updating media: prefers-color-scheme*/</span><br/><span class="hl-1">    </span><span class="hl-5">media</span><span class="hl-1">.</span><span class="hl-0">addEventListener</span><span class="hl-1">(</span><span class="hl-2">"change"</span><span class="hl-1">, () </span><span class="hl-6">=></span><br/><span class="hl-1">      </span><span class="hl-0">setThemeState</span><span class="hl-1">(</span><span class="hl-5">state</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> ({ ...</span><span class="hl-5">state</span><span class="hl-1">, </span><span class="hl-5">s:</span><span class="hl-1"> </span><span class="hl-5">media</span><span class="hl-1">.</span><span class="hl-5">matches</span><span class="hl-1"> ? </span><span class="hl-13">DARK</span><span class="hl-1"> : </span><span class="hl-13">LIGHT</span><span class="hl-1"> })),</span><br/><span class="hl-1">    );</span><br/><span class="hl-1">    </span><span class="hl-3">/** Sync the tabs */</span><br/><span class="hl-1">    </span><span class="hl-0">addEventListener</span><span class="hl-1">(</span><span class="hl-2">"storage"</span><span class="hl-1">, (</span><span class="hl-5">e</span><span class="hl-1">: </span><span class="hl-8">StorageEvent</span><span class="hl-1">): </span><span class="hl-8">void</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> {</span><br/><span class="hl-1">      </span><span class="hl-5">e</span><span class="hl-1">.</span><span class="hl-5">key</span><span class="hl-1"> === </span><span class="hl-5">k</span><span class="hl-1"> && </span><span class="hl-0">setThemeState</span><span class="hl-1">(</span><span class="hl-5">state</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> ({ ...</span><span class="hl-5">state</span><span class="hl-1">, </span><span class="hl-5">m:</span><span class="hl-1"> </span><span class="hl-5">e</span><span class="hl-1">.</span><span class="hl-5">newValue</span><span class="hl-1"> </span><span class="hl-4">as</span><span class="hl-1"> </span><span class="hl-8">ColorSchemePreference</span><span class="hl-1"> }));</span><br/><span class="hl-1">    });</span><br/><span class="hl-1">  }, []);</span><br/><br/><span class="hl-1">  </span><span class="hl-0">useEffect</span><span class="hl-1">(() </span><span class="hl-6">=></span><span class="hl-1"> {</span><br/><span class="hl-1">    </span><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-13">restoreTransitions</span><span class="hl-1"> = </span><span class="hl-0">modifyTransition</span><span class="hl-1">(</span><span class="hl-5">t</span><span class="hl-1">, </span><span class="hl-5">nonce</span><span class="hl-1">);</span><br/><span class="hl-1">    </span><span class="hl-0">updateDOM</span><span class="hl-1">(</span><span class="hl-5">mode</span><span class="hl-1">, </span><span class="hl-5">systemMode</span><span class="hl-1">);</span><br/><span class="hl-1">    </span><span class="hl-0">restoreTransitions</span><span class="hl-1">();</span><br/><span class="hl-1">  }, [</span><span class="hl-5">systemMode</span><span class="hl-1">, </span><span class="hl-5">mode</span><span class="hl-1">, </span><span class="hl-5">t</span><span class="hl-1">, </span><span class="hl-5">nonce</span><span class="hl-1">]);</span><br/><br/><span class="hl-1">  </span><span class="hl-4">return</span><span class="hl-1"> <</span><span class="hl-8">Script</span><span class="hl-1"> {...{ </span><span class="hl-5">n</span><span class="hl-1">: </span><span class="hl-8">nonce</span><span class="hl-1">, </span><span class="hl-5">k</span><span class="hl-1"> }} />;</span><br/><span class="hl-1">};</span>
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