Support Observer callback union for subscription (#89)

SHA: cfffd49
Reason: push, by domfarolino

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

index.html

@@ -6,7 +6,7 @@
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   <meta content="Bikeshed version 82ce88815, updated Thu Sep 7 16:33:55 2023 -0700" name="generator">
   <link href="https://wicg.github.io/observable/" rel="canonical">
-  <meta content="e153f01dff47ebf8a52e9f45d3867ae5f694ad58" name="document-revision">
+  <meta content="cfffd491ad7fc9db182f746f424c7b57a1463251" name="document-revision">
 <style>
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@@ -977,6 +977,8 @@ <h3 class="heading settled" data-level="2.2" id="observable-api"><span class="se
   <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#VoidFunction" id="ref-for-VoidFunction①"><c- n>VoidFunction</c-></a> <dfn class="idl-code" data-dfn-for="Observer" data-dfn-type="dict-member" data-export data-type="VoidFunction " id="dom-observer-complete"><code><c- g>complete</c-></code><a class="self-link" href="#dom-observer-complete"></a></dfn>;
 };
 
+<c- b>typedef</c-> (<a data-link-type="idl-name" href="#callbackdef-observercallback" id="ref-for-callbackdef-observercallback②"><c- n>ObserverCallback</c-></a> <c- b>or</c-> <a data-link-type="idl-name" href="#dictdef-observer" id="ref-for-dictdef-observer"><c- n>Observer</c-></a>) <dfn class="dfn-paneled idl-code" data-dfn-type="typedef" data-export id="typedefdef-observerunion"><code><c- g>ObserverUnion</c-></code></dfn>;
+
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-subscribeoptions"><code><c- g>SubscribeOptions</c-></code></dfn> {
   <a data-link-type="idl-name" href="https://dom.spec.whatwg.org/#abortsignal" id="ref-for-abortsignal①"><c- n>AbortSignal</c-></a> <dfn class="idl-code" data-dfn-for="SubscribeOptions" data-dfn-type="dict-member" data-export data-type="AbortSignal " id="dom-subscribeoptions-signal"><code><c- g>signal</c-></code><a class="self-link" href="#dom-subscribeoptions-signal"></a></dfn>;
 };
@@ -995,7 +997,7 @@ <h3 class="heading settled" data-level="2.2" id="observable-api"><span class="se
 [Exposed=*]
 <c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="observable"><code><c- g>Observable</c-></code></dfn> {
   <dfn class="idl-code" data-dfn-for="Observable" data-dfn-type="constructor" data-export data-lt="Observable(callback)|constructor(callback)" id="dom-observable-observable"><code><c- g>constructor</c-></code><a class="self-link" href="#dom-observable-observable"></a></dfn>(<a data-link-type="idl-name" href="#callbackdef-subscribecallback" id="ref-for-callbackdef-subscribecallback"><c- n>SubscribeCallback</c-></a> <dfn class="idl-code" data-dfn-for="Observable/Observable(callback), Observable/constructor(callback)" data-dfn-type="argument" data-export id="dom-observable-observable-callback-callback"><code><c- g>callback</c-></code><a class="self-link" href="#dom-observable-observable-callback-callback"></a></dfn>);
-  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined⑦"><c- b>undefined</c-></a> <dfn class="idl-code" data-dfn-for="Observable" data-dfn-type="method" data-export data-lt="subscribe(observer, options)|subscribe(observer)|subscribe()" id="dom-observable-subscribe"><code><c- g>subscribe</c-></code><a class="self-link" href="#dom-observable-subscribe"></a></dfn>(<c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-observer" id="ref-for-dictdef-observer"><c- n>Observer</c-></a> <dfn class="idl-code" data-dfn-for="Observable/subscribe(observer, options), Observable/subscribe(observer), Observable/subscribe()" data-dfn-type="argument" data-export id="dom-observable-subscribe-observer-options-observer"><code><c- g>observer</c-></code><a class="self-link" href="#dom-observable-subscribe-observer-options-observer"></a></dfn> = {}, <c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-subscribeoptions" id="ref-for-dictdef-subscribeoptions"><c- n>SubscribeOptions</c-></a> <dfn class="idl-code" data-dfn-for="Observable/subscribe(observer, options), Observable/subscribe(observer), Observable/subscribe()" data-dfn-type="argument" data-export id="dom-observable-subscribe-observer-options-options"><code><c- g>options</c-></code><a class="self-link" href="#dom-observable-subscribe-observer-options-options"></a></dfn> = {});
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined⑦"><c- b>undefined</c-></a> <dfn class="idl-code" data-dfn-for="Observable" data-dfn-type="method" data-export data-lt="subscribe(observer, options)|subscribe(observer)|subscribe()" id="dom-observable-subscribe"><code><c- g>subscribe</c-></code><a class="self-link" href="#dom-observable-subscribe"></a></dfn>(<c- b>optional</c-> <a data-link-type="idl-name" href="#typedefdef-observerunion" id="ref-for-typedefdef-observerunion"><c- n>ObserverUnion</c-></a> <dfn class="idl-code" data-dfn-for="Observable/subscribe(observer, options), Observable/subscribe(observer), Observable/subscribe()" data-dfn-type="argument" data-export id="dom-observable-subscribe-observer-options-observer"><code><c- g>observer</c-></code><a class="self-link" href="#dom-observable-subscribe-observer-options-observer"></a></dfn> = {}, <c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-subscribeoptions" id="ref-for-dictdef-subscribeoptions"><c- n>SubscribeOptions</c-></a> <dfn class="idl-code" data-dfn-for="Observable/subscribe(observer, options), Observable/subscribe(observer), Observable/subscribe()" data-dfn-type="argument" data-export id="dom-observable-subscribe-observer-options-options"><code><c- g>options</c-></code><a class="self-link" href="#dom-observable-subscribe-observer-options-options"></a></dfn> = {});
 
   <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined⑧"><c- b>undefined</c-></a> <dfn class="idl-code" data-dfn-for="Observable" data-dfn-type="method" data-export data-lt="finally(callback)" id="dom-observable-finally"><code><c- g>finally</c-></code><a class="self-link" href="#dom-observable-finally"></a></dfn>(<a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#VoidFunction" id="ref-for-VoidFunction②"><c- n>VoidFunction</c-></a> <dfn class="idl-code" data-dfn-for="Observable/finally(callback)" data-dfn-type="argument" data-export id="dom-observable-finally-callback-callback"><code><c- g>callback</c-></code><a class="self-link" href="#dom-observable-finally-callback-callback"></a></dfn>);
 
@@ -1084,6 +1086,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#dictdef-observableeventlisteneroptions">ObservableEventListenerOptions</a><span>, in § 3</span>
    <li><a href="#dictdef-observer">Observer</a><span>, in § 2.2</span>
    <li><a href="#callbackdef-observercallback">ObserverCallback</a><span>, in § 2.2</span>
+   <li><a href="#typedefdef-observerunion">ObserverUnion</a><span>, in § 2.2</span>
    <li><a href="#dom-eventtarget-on">on(type)</a><span>, in § 3</span>
    <li><a href="#dom-eventtarget-on">on(type, options)</a><span>, in § 3</span>
    <li><a href="#dom-observableeventlisteneroptions-passive">passive</a><span>, in § 3</span>
@@ -1170,6 +1173,8 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
   <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#VoidFunction"><c- n>VoidFunction</c-></a> <a data-type="VoidFunction " href="#dom-observer-complete"><code><c- g>complete</c-></code></a>;
 };
 
+<c- b>typedef</c-> (<a data-link-type="idl-name" href="#callbackdef-observercallback"><c- n>ObserverCallback</c-></a> <c- b>or</c-> <a data-link-type="idl-name" href="#dictdef-observer"><c- n>Observer</c-></a>) <a href="#typedefdef-observerunion"><code><c- g>ObserverUnion</c-></code></a>;
+
 <c- b>dictionary</c-> <a href="#dictdef-subscribeoptions"><code><c- g>SubscribeOptions</c-></code></a> {
   <a data-link-type="idl-name" href="https://dom.spec.whatwg.org/#abortsignal"><c- n>AbortSignal</c-></a> <a data-type="AbortSignal " href="#dom-subscribeoptions-signal"><code><c- g>signal</c-></code></a>;
 };
@@ -1188,7 +1193,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
 [Exposed=*]
 <c- b>interface</c-> <a href="#observable"><code><c- g>Observable</c-></code></a> {
   <a href="#dom-observable-observable"><code><c- g>constructor</c-></code></a>(<a data-link-type="idl-name" href="#callbackdef-subscribecallback"><c- n>SubscribeCallback</c-></a> <a href="#dom-observable-observable-callback-callback"><code><c- g>callback</c-></code></a>);
-  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a> <a href="#dom-observable-subscribe"><code><c- g>subscribe</c-></code></a>(<c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-observer"><c- n>Observer</c-></a> <a href="#dom-observable-subscribe-observer-options-observer"><code><c- g>observer</c-></code></a> = {}, <c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-subscribeoptions"><c- n>SubscribeOptions</c-></a> <a href="#dom-observable-subscribe-observer-options-options"><code><c- g>options</c-></code></a> = {});
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a> <a href="#dom-observable-subscribe"><code><c- g>subscribe</c-></code></a>(<c- b>optional</c-> <a data-link-type="idl-name" href="#typedefdef-observerunion"><c- n>ObserverUnion</c-></a> <a href="#dom-observable-subscribe-observer-options-observer"><code><c- g>observer</c-></code></a> = {}, <c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-subscribeoptions"><c- n>SubscribeOptions</c-></a> <a href="#dom-observable-subscribe-observer-options-options"><code><c- g>options</c-></code></a> = {});
 
   <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a> <a href="#dom-observable-finally"><code><c- g>finally</c-></code></a>(<a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#VoidFunction"><c- n>VoidFunction</c-></a> <a href="#dom-observable-finally-callback-callback"><code><c- g>callback</c-></code></a>);
 
@@ -1550,8 +1555,9 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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