Add OnyxStore as a standalone, inert module

[fabioh8010]

Details

Coming from https://expensify.slack.com/archives/C05LX9D6E07/p1788270903471539.

Adds OnyxStore, a standalone listener registry that will back Onyx subscriptions in the store-based redesign. Nothing calls it yet, so this PR is inert and changes no behavior.

OnyxStore keeps a single Map<key, Set<listener>>. Subscribing is a Set.add, unsubscribing a Set.delete, and a write looks up only the affected key's listeners:

• subscribe(key, listener) registers an exact-key listener (a single key, a collection root, or a collection member) and returns an unsubscribe function.
• getState(key) reads the eager cache: the frozen collection object for collection keys, the cached value otherwise.
• notifyKey(key, value) dispatches a single-key write and routes to the parent collection's listeners when the key is a collection member.
• notifyCollection(key, partial, previous) dispatches a batch update, firing collection listeners once and member listeners only for members whose value reference actually changed.

A throwing listener is caught and logged so it can't stop the others. The module depends only on OnyxCache and OnyxKeys.

The next PR wires the subscription layer onto OnyxStore and deletes the old per-subscription bookkeeping. Full context is in the proposal thread.

Related Issues

Expensify/App#100271

Linked E/App PR

Expensify/App#100316

Automated Tests

Tests were added for the new module.

Manual Tests

There is nothing to test right now as we are just adding a new module without using it.

Author Checklist

• I linked the correct issue in the ### Related Issues section above
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  • I verified the JSDocs style guidelines (in STYLE.md) were followed
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• I followed the guidelines as stated in the Review Guidelines
• I tested other components that can be impacted by my changes (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar are working as expected)
• I verified all code is DRY (the PR doesn't include any logic written more than once, with the exception of tests)
• I verified any variables that can be defined as constants (ie. in CONST.js or at the top of the file that uses the constant) are defined as such
• I verified that if a function's arguments changed that all usages have also been updated correctly
• If a new component is created I verified that:
  • A similar component doesn't exist in the codebase
  • All props are defined accurately and each prop has a /** comment above it */
  • The file is named correctly
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  • The only data being stored in the state is data necessary for rendering and nothing else
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[fabioh8010]

@codex review

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[huult]

@fabioh8010 Could you take a look at the comments above?

[roryabraham]

Not sure if you missed this from my last review. if direct writes to a collection root are an unsupported anti-pattern, why not prevent them at compile time?

diff --git a/lib/OnyxSubscriptionManager.ts b/lib/OnyxSubscriptionManager.ts
index 7e61ec7e..8bc43472 100644
--- a/lib/OnyxSubscriptionManager.ts
+++ b/lib/OnyxSubscriptionManager.ts
@@ -78,7 +78,7 @@ class OnyxSubscriptionManager {
      *   2. If key is a collection member, keyListeners.get(collectionKey): collection
      *      listeners for the parent collection.
      */
-    notifyKey<TKey extends OnyxKey>(key: TKey, value: OnyxValue<TKey>): void {
+    notifyKey<TKey extends Exclude<OnyxKey, CollectionKeyBase>>(key: TKey, value: OnyxValue<TKey>): void {
         // 1. Exact-key listeners
         const exact = this.keyListeners.get(key);
         if (exact && exact.size > 0) {

[fabioh8010]

Sorry, forgot to answer about this one. While it makes sense for external consumers like E/App (if we exported this module), it breaks completely internally because OnyxKey and CollectionKeyBase are both string from library's own perspective – external consumers will augment Onyx types with the correct keys but internally we set them to string, see TypeOptions type. Since they are both string, Exclude<string, string> will resolve to never and any call of this function inside the repo will break.

We shouldn't worry about this though, this module isn't supposed to be exported or used externally by consumers.

[roryabraham]

@huult @Gonals back to you (though there's nothing to test here yet)

[huult]

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Screenshots/Videos

Android: HybridApp

Android: mWeb Chrome

iOS: HybridApp

iOS: mWeb Safari

MacOS: Chrome / Safari

[huult]

LGTM.

[os-botify]

🚀 Published to npm in 3.0.111 🎉