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refactor: make fetchContext required on FeedSource

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Sources that cannot provide context now return null
instead of omitting the method. The engine checks the
return value rather than method existence.

Co-authored-by: Ona <no-reply@ona.com>
This commit is contained in:
Kenneth
2026-02-14 16:20:24 +00:00
parent 476c6f06d9
commit 1f2920a7ad
12 changed files with 154 additions and 50 deletions
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22
packages/aris-core/src/feed-engine.ts
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@@ -89,16 +89,16 @@ export class FeedEngine<TItems extends FeedItem = FeedItem> {
// Run fetchContext in topological order
for (const source of graph.sorted) {
if (source.fetchContext) {
try {
const update = await source.fetchContext(context)
try {
const update = await source.fetchContext(context)
if (update) {
context = { ...context, ...update }
} catch (err) {
errors.push({
sourceId: source.id,
error: err instanceof Error ? err : new Error(String(err)),
})
}
} catch (err) {
errors.push({
sourceId: source.id,
error: err instanceof Error ? err : new Error(String(err)),
})
}
}
@@ -208,10 +208,12 @@ export class FeedEngine<TItems extends FeedItem = FeedItem> {
// Re-run fetchContext for dependents in order
for (const id of toRefresh) {
const source = graph.sources.get(id)
if (source?.fetchContext) {
if (source) {
try {
const update = await source.fetchContext(this.context)
this.context = { ...this.context, ...update }
if (update) {
this.context = { ...this.context, ...update }
}
} catch {
// Errors during reactive updates are logged but don't stop propagation
}