feat: Edge Runtime & Offline-First Sync Protocol #355

Copilot · 2026-02-08T07:16:52Z

Implements the Q3 2026 work plan: edge runtime adaptation layer and offline-first sync protocol with client-side mutation logging, server-side delta computation, and pluggable conflict resolution.

New Packages

`@objectql/edge-adapter`

Runtime auto-detection (Cloudflare Workers, Deno Deploy, Vercel Edge, Bun, Node)
Capability validation against platform profiles (WASM, persistent storage, WebSocket, execution limits)
Driver binding resolution — maps datasources to edge-native storage primitives (D1, KV, OPFS)
EdgeAdapterPlugin implementing RuntimePlugin lifecycle

`@objectql/plugin-sync`

MutationLogger — client-side append-only log with sequence tracking
SyncEngine — push/pull orchestration with debounced batching and checkpoint management
Three conflict resolvers: Last-Write-Wins, CRDT (field-level LWW-Register), Manual (callback)
SyncPlugin with lazy per-object engine creation

`@objectql/protocol-sync`

ChangeLog — server-side append-only change log with checkpoint-based delta computation
VersionStore — per-record optimistic concurrency control
SyncHandler — processes push requests, detects conflicts, returns server deltas

Other Changes

WASM drivers: enabled mutationLog and changeTracking capabilities on sqlite-wasm and pg-wasm
vitest.config.ts: added path aliases for new packages
Docs: edge runtime guide, offline sync guide, server nav updated

Usage

import { EdgeAdapterPlugin } from '@objectql/edge-adapter';
import { SyncPlugin } from '@objectql/plugin-sync';
import { SyncProtocolPlugin } from '@objectql/protocol-sync';

// Edge: auto-detect runtime, validate capabilities, resolve bindings
new EdgeAdapterPlugin({
  runtime: 'cloudflare-workers',
  bindings: { main: { driver: '@objectql/driver-sqlite-wasm', binding: 'D1_DATABASE' } },
  requirements: { wasm: true, persistentStorage: true },
});

// Client sync: record mutations offline, push when online
new SyncPlugin({
  clientId: 'device-abc',
  transport: { push: (req) => fetch('/api/sync', { method: 'POST', body: JSON.stringify(req) }).then(r => r.json()) },
});

// Server sync: handle push requests with conflict detection
new SyncProtocolPlugin({
  endpoint: { enabled: true, path: '/api/sync', maxMutationsPerRequest: 100 },
});

81 new tests across 3 packages.

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vercel · 2026-02-08T07:16:59Z

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
objectql	Ready	Preview, Comment	Feb 8, 2026 7:49am

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

…liases for new packages Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

github-actions · 2026-02-08T08:09:56Z

⚠️ No Changeset Found

This PR does not include a changeset file.
If this PR includes user-facing changes, please add a changeset by running:

pnpm changeset

Copilot

Pull request overview

Adds an edge runtime adaptation layer and an offline-first sync protocol to the ObjectQL monorepo, introducing new client/server sync packages, wiring test aliases, and documenting usage for edge + sync workflows.

Changes:

Added @objectql/edge-adapter for runtime detection, capability validation, and edge driver binding resolution.
Added offline-first sync packages: client @objectql/plugin-sync (mutation log + sync engine) and server @objectql/protocol-sync (handler + change log + version store).
Enabled sync-related driver capabilities for WASM drivers and updated docs/test config to support new packages.

Reviewed changes

Copilot reviewed 33 out of 34 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
vitest.config.ts	Adds path aliases for new edge + sync packages.
pnpm-lock.yaml	Adds new workspace importers/lock entries for the added packages.
packages/protocols/sync/tsconfig.json	Introduces tsconfig for new server sync protocol package.
packages/protocols/sync/src/version-store.ts	Adds in-memory server-side record version tracking.
packages/protocols/sync/src/sync-handler.ts	Implements push handling, conflict detection, and delta computation.
packages/protocols/sync/src/plugin.ts	Adds `SyncProtocolPlugin` to attach sync handler to the runtime context.
packages/protocols/sync/src/index.ts	Exports protocol-sync public API and re-exports sync types.
packages/protocols/sync/src/index.test.ts	Adds unit tests for ChangeLog, VersionStore, SyncHandler, and plugin integration.
packages/protocols/sync/src/change-log.ts	Adds checkpointed server change log with retention configuration and pruning API.
packages/protocols/sync/package.json	Defines new `@objectql/protocol-sync` package metadata/scripts.
packages/protocols/sync/README.md	Documents server-side sync protocol usage and API.
packages/foundation/plugin-sync/tsconfig.json	Introduces tsconfig for new client sync plugin package.
packages/foundation/plugin-sync/src/sync-engine.ts	Adds client sync engine with batching, checkpointing, and listener hooks.
packages/foundation/plugin-sync/src/plugin.ts	Adds `SyncPlugin` to expose per-object engines on the runtime context.
packages/foundation/plugin-sync/src/mutation-logger.ts	Adds in-memory append-only mutation log implementation.
packages/foundation/plugin-sync/src/index.ts	Exports plugin-sync public API and re-exports sync types.
packages/foundation/plugin-sync/src/index.test.ts	Adds unit tests for logger/resolvers/engine/plugin behaviors.
packages/foundation/plugin-sync/src/conflict-resolver.ts	Adds LWW/CRDT/manual conflict resolver implementations + factory.
packages/foundation/plugin-sync/package.json	Defines new `@objectql/plugin-sync` package metadata/scripts.
packages/foundation/plugin-sync/README.md	Documents client-side sync plugin usage and configuration.
packages/foundation/edge-adapter/tsconfig.json	Introduces tsconfig for new edge adapter package.
packages/foundation/edge-adapter/src/plugin.ts	Adds `EdgeAdapterPlugin` to detect runtime/validate/resolve bindings and attach context.
packages/foundation/edge-adapter/src/index.ts	Exports edge-adapter public API.
packages/foundation/edge-adapter/src/index.test.ts	Adds unit tests for runtime detection, capability validation, binding resolution, and plugin lifecycle.
packages/foundation/edge-adapter/src/detector.ts	Implements edge runtime auto-detection logic.
packages/foundation/edge-adapter/src/capabilities.ts	Implements capability lookup + requirement validation.
packages/foundation/edge-adapter/src/binding-resolver.ts	Implements default driver selection + binding resolution.
packages/foundation/edge-adapter/package.json	Defines new `@objectql/edge-adapter` package metadata/scripts.
packages/foundation/edge-adapter/README.md	Documents edge runtime adapter usage and configuration.
packages/drivers/sqlite-wasm/src/index.ts	Enables `mutationLog` and `changeTracking` capabilities for sqlite-wasm driver.
packages/drivers/pg-wasm/src/index.ts	Enables `mutationLog` and `changeTracking` capabilities for pg-wasm driver.
content/docs/server/sync.mdx	Adds server docs page describing offline-first sync architecture and usage.
content/docs/server/meta.json	Updates server docs navigation to include edge and sync.
content/docs/server/edge.mdx	Adds server docs page describing edge runtime support and configuration.

Files not reviewed (1)

pnpm-lock.yaml: Language not supported

Copilot · 2026-02-08T08:23:55Z

packages/foundation/plugin-sync/src/mutation-logger.ts

+  private generateId(): string {
+    // Simple UUID v4-like generation for environments without crypto.randomUUID
+    const hex = '0123456789abcdef';
+    let id = '';
+    for (let i = 0; i < 32; i++) {


MutationLogEntry.id is specified in @objectql/types as a UUID v7 (time-ordered). generateId() currently produces a Math.random-based v4-like ID, which violates the protocol contract and can break ordering/dedup expectations. Generate UUID v7 (or use a UUID v7 library) and avoid Math.random for IDs.

Copilot · 2026-02-08T08:23:55Z

packages/foundation/plugin-sync/src/sync-engine.ts

+  /** Record a mutation and optionally trigger debounced sync */
+  recordMutation(entry: {
+    objectName: string;
+    recordId: string | number;
+    operation: MutationOperation;


SyncEngine doesn't honor SyncConfig.enabled. recordMutation() will append mutations and schedule sync even when sync is disabled for an object, contradicting the config contract. Gate recordMutation/scheduleSync/sync() on this.config.enabled (and avoid emitting sync events) when disabled.

Copilot · 2026-02-08T08:23:55Z

packages/foundation/plugin-sync/src/sync-engine.ts

+    this.logger = new MutationLogger(options.clientId);
+    this.transport = options.transport;
+    this.config = options.config;
+    this.resolver = createResolver(options.config.strategy ?? 'last-write-wins', options.onConflict);
+  }


SyncEngine constructs a ConflictResolver (this.resolver) but never uses it; conflicts are only collected and surfaced to listeners. This makes the advertised conflict resolution strategies effectively unused. Either apply the resolver to conflicts during sync (and then requeue/patch mutations) or remove the resolver wiring to avoid misleading API behavior.

Copilot · 2026-02-08T08:23:55Z

packages/protocols/sync/src/sync-handler.ts

+  async handlePush(request: SyncPushRequest, resolver: RecordResolver): Promise<SyncPushResponse> {
+    const maxMutations = this.config.maxMutationsPerRequest ?? 100;
+
+    if (request.mutations.length > maxMutations) {
+      const results: SyncMutationResult[] = request.mutations.map(() => ({


ChangeLog retention is never enforced unless prune() is called, but handlePush() never invokes prune(). This makes change-log growth unbounded in long-running servers despite having a retention config. Call this.changeLog.prune() periodically (e.g., at the start/end of handlePush) or make pruning automatic in ChangeLog.record().

Copilot · 2026-02-08T08:23:56Z

packages/protocols/sync/src/sync-handler.ts

+    // Handle update operations — check for conflicts
+    if (mutation.baseVersion !== null && mutation.baseVersion < currentVersion) {
+      const serverRecord = await resolver.getRecord(mutation.objectName, mutation.recordId);
+      if (!serverRecord) {
+        return { status: 'rejected', reason: 'Record not found' };
+      }
+
+      const objectConflictFields = this.conflictFields.get(mutation.objectName) ?? [];
+      const conflictingFields = this.detectConflictingFields(mutation, serverRecord, objectConflictFields);
+
+      if (conflictingFields.length > 0) {
+        const conflict: SyncConflict = {
+          objectName: mutation.objectName,
+          recordId: mutation.recordId,
+          clientMutation: mutation,
+          serverRecord,
+          conflictingFields,
+        };
+        return { status: 'conflict', conflict };
+      }
+    }
+
+    // No conflict — apply the update
+    const newVersion = this.versionStore.increment(mutation.objectName, mutation.recordId);
+    await resolver.applyMutation(mutation, newVersion);
+    this.changeLog.record({
+      objectName: mutation.objectName,
+      recordId: mutation.recordId,
+      operation: 'update',
+      data: mutation.data,
+      serverVersion: newVersion,
+    });
+    return { status: 'applied', serverVersion: newVersion };


Updates are applied unconditionally here. If the record doesn't exist on the server (currentVersion === 0), an 'update' mutation can still be applied, which can create phantom records depending on RecordResolver.applyMutation. Consider rejecting update when the record is not found (and validating baseVersion is non-null for update ops).

Suggested change

// Handle update operations — check for conflicts

if (mutation.baseVersion !== null && mutation.baseVersion < currentVersion) {

const serverRecord = await resolver.getRecord(mutation.objectName, mutation.recordId);

if (!serverRecord) {

return { status: 'rejected', reason: 'Record not found' };

}

const objectConflictFields = this.conflictFields.get(mutation.objectName) ?? [];

const conflictingFields = this.detectConflictingFields(mutation, serverRecord, objectConflictFields);

if (conflictingFields.length > 0) {

const conflict: SyncConflict = {

objectName: mutation.objectName,

recordId: mutation.recordId,

clientMutation: mutation,

serverRecord,

conflictingFields,

};

return { status: 'conflict', conflict };

}

}

// No conflict — apply the update

const newVersion = this.versionStore.increment(mutation.objectName, mutation.recordId);

await resolver.applyMutation(mutation, newVersion);

this.changeLog.record({

objectName: mutation.objectName,

recordId: mutation.recordId,

operation: 'update',

data: mutation.data,

serverVersion: newVersion,

});

return { status: 'applied', serverVersion: newVersion };

// Handle update operations — check for existence and conflicts

if (mutation.operation === 'update') {

if (currentVersion === 0) {

return { status: 'rejected', reason: 'Record not found' };

}

if (mutation.baseVersion == null) {

return { status: 'rejected', reason: 'Missing baseVersion for update' };

}

if (mutation.baseVersion < currentVersion) {

const serverRecord = await resolver.getRecord(mutation.objectName, mutation.recordId);

if (!serverRecord) {

return { status: 'rejected', reason: 'Record not found' };

}

const objectConflictFields = this.conflictFields.get(mutation.objectName) ?? [];

const conflictingFields = this.detectConflictingFields(mutation, serverRecord, objectConflictFields);

if (conflictingFields.length > 0) {

const conflict: SyncConflict = {

objectName: mutation.objectName,

recordId: mutation.recordId,

clientMutation: mutation,

serverRecord,

conflictingFields,

};

return { status: 'conflict', conflict };

}

}

// No conflict — apply the update

const newVersion = this.versionStore.increment(mutation.objectName, mutation.recordId);

await resolver.applyMutation(mutation, newVersion);

this.changeLog.record({

objectName: mutation.objectName,

recordId: mutation.recordId,

operation: 'update',

data: mutation.data,

serverVersion: newVersion,

});

return { status: 'applied', serverVersion: newVersion };

}

Copilot · 2026-02-08T08:23:56Z

packages/protocols/sync/src/plugin.ts

+  async install(ctx: RuntimeContext): Promise<void> {
+    if (!this.config.endpoint.enabled) return;
+
+    this.handler = new SyncHandler({
+      config: this.config.endpoint,


SyncEndpointConfig includes fields like path/realtime, but the plugin only registers a handler on ctx.engine and doesn’t use endpoint.path (or register an HTTP/WebSocket route). This makes the config surface and docs read like a full endpoint implementation when it's not. Either wire these fields into the runtime’s HTTP layer (or a server plugin) or remove/rename unused config fields.

Copilot · 2026-02-08T08:23:56Z

content/docs/server/sync.mdx

+
+const transport = {
+  async push(request) {
+    const res = await fetch('/api/sync/push', {


Client example posts to '/api/sync/push', but later server examples/config use '/api/sync' (endpoint.path) and an Express route at '/api/sync/push'. Align these paths (or explain push vs base path) so readers configure client/server consistently.

Suggested change

const res = await fetch('/api/sync/push', {

const res = await fetch('/api/sync', {

Copilot · 2026-02-08T08:23:56Z

packages/foundation/edge-adapter/src/plugin.ts

+            const validation = validateCapabilities(runtime, this.config.requirements);
+            if (!validation.valid) {
+                throw new Error(
+                    `[${this.name}] Runtime '${runtime}' missing capabilities: ${validation.missing.join(', ')}`,
+                );


EdgeAdapterPlugin throws a generic Error when capability validation fails. The repo commonly uses structured ObjectQLError for user-facing failures; using Error here makes error handling inconsistent for consumers. Throw ObjectQLError (with a code/details) and include the missing capabilities in details rather than only in the message string.

Copilot · 2026-02-08T08:23:57Z

packages/foundation/plugin-sync/src/conflict-resolver.ts

+export function createResolver(
+  strategy: string,
+  onConflict?: (conflict: SyncConflict) => Record<string, unknown> | undefined
+): ConflictResolver {


createResolver() / ConflictResolver.strategy are typed as plain string even though SyncStrategy is a closed union in @objectql/types. Using string weakens type-safety and permits invalid strategies at compile time. Consider typing strategy as SyncStrategy (and ConflictResolver.strategy as SyncStrategy) so the API stays aligned with the protocol types.

Copilot · 2026-02-08T08:23:57Z

packages/protocols/sync/README.md

+- Server-side append-only change log with monotonic checkpoints
+- Configurable retention policy (days)
+- Checkpoint-based delta queries for efficient sync
+- Automatic pruning of expired entries


The README claims "Automatic pruning of expired entries", but the current implementation only exposes prune() and never calls it automatically. Update the README to reflect manual pruning, or implement automatic pruning in the sync handler/change log so the statement is accurate.

Suggested change

- Automatic pruning of expired entries

- Supports manual pruning of expired entries via the `prune()` API

Initial plan

95c68a1

Copilot AI assigned Copilot and hotlong Feb 8, 2026

Copilot started work on behalf of hotlong February 8, 2026 07:17 View session

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feat: add @objectql/edge-adapter foundation package

fc806b1

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

vercel bot deployed to Preview February 8, 2026 07:26 View deployment

feat: add @objectql/plugin-sync offline-first sync plugin package

a94a60a

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

vercel bot deployed to Preview February 8, 2026 07:32 View deployment

feat: add @objectql/protocol-sync package for server-side sync protocol

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vercel bot deployed to Preview February 8, 2026 07:39 View deployment

feat: enable mutationLog/changeTracking in WASM drivers, add vitest a…

5ea06b7

…liases for new packages Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

vercel bot deployed to Preview February 8, 2026 07:42 View deployment

docs: add documentation for Edge Runtime and Offline Sync packages

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Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

vercel bot deployed to Preview February 8, 2026 07:49 View deployment

Copilot AI changed the title ~~[WIP] Complete development for edge runtime support~~ feat: Edge Runtime & Offline-First Sync Protocol Feb 8, 2026

Copilot AI requested a review from hotlong February 8, 2026 07:52

Copilot finished work on behalf of hotlong February 8, 2026 07:52

github-actions bot added 🏗️ foundation 🔌 drivers 🧪 tests 📦 dependencies 📚 documentation size/XL labels Feb 8, 2026

hotlong marked this pull request as ready for review February 8, 2026 08:16

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View reviewed changes

hotlong merged commit b40eb04 into main Feb 8, 2026
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hotlong deleted the copilot/complete-edge-runtime-support branch February 8, 2026 08:17

Copilot AI reviewed Feb 8, 2026

View reviewed changes

	const res = await fetch('/api/sync/push', {
	const res = await fetch('/api/sync', {

	- Automatic pruning of expired entries
	- Supports manual pruning of expired entries via the `prune()` API

feat: Edge Runtime & Offline-First Sync Protocol #355

feat: Edge Runtime & Offline-First Sync Protocol #355

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New Packages

@objectql/edge-adapter

@objectql/plugin-sync

@objectql/protocol-sync

Other Changes

Usage

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Copilot AI commented Feb 8, 2026 •

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`@objectql/edge-adapter`

`@objectql/plugin-sync`

`@objectql/protocol-sync`

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