Correctly determine channel for APIs with dependencies.

tools/lib/channel.js

@@ -48,4 +48,28 @@ export function mostReleasedChannel(a, b) {
   } else {
     return b;
   }
-}
+}
+
+/**
+ * Finds the channel that is furthest from 'stable'. If either param is `undefined`, returns the other.
+ *
+ * @param {chromeTypes.Channel | undefined} a
+ * @param {chromeTypes.Channel | undefined} b
+ * @return {chromeTypes.Channel | undefined}
+ */
+export function leastReleasedChannel(a, b) {
+  if (!a) {
+    return b;
+  } else if (!b) {
+    return a;
+  }
+
+  const indexA = channelOrdering.indexOf(a);
+  const indexB = channelOrdering.indexOf(b);
+
+  if (indexA > indexB) {
+    return a;
+  } else {
+    return b;
+  }
+}

tools/override.js

@@ -22,7 +22,7 @@
 
 import * as chromeTypes from '../types/chrome.js';
 import * as overrideTypes from '../types/override.js';
-import { mostReleasedChannel } from './lib/channel.js';
+import { leastReleasedChannel, mostReleasedChannel } from './lib/channel.js';
 import { buildNamespaceAwareMarkdownRewrite } from './lib/comment.js';
 import { FeatureQuery } from './lib/feature-query.js';
 import { namespaceNameFromId, parentId } from './lib/traverse.js';
@@ -446,7 +446,7 @@ export class RenderOverride extends EmptyRenderOverride {
     let bestChannel = undefined;
 
     this.#fq.checkFeature(id, (f, otherId) => {
-      bestChannel = mostReleasedChannel(bestChannel, f.channel);
+      bestChannel = leastReleasedChannel(bestChannel, f.channel);
     });
 
     return bestChannel ?? 'stable';