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emulate already uses a plugin-shaped internal architecture through per-service packages and ServicePlugin, but new emulators still require hardcoded core registry changes. This change reuses that existing service-entry path to allow external plugins while preserving built-in behavior and keeping scope limited to loading, listing, init, and programmatic startup.
…tection Preserve ServiceName autocomplete with branded string pattern, load plugins in parallel, and guard against name collisions with built-in services or duplicate plugins.
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Summary
Adds a
--pluginflag to load external emulator services at runtime without modifying the core package.start,init, andlistcommands, and the programmaticcreateEmulatorAPIMotivation
The service list is growing steadily (#38 Clerk, #47 Stripe, #51 Resend) and each addition is a PR into core. This works today, but the trajectory points toward a repo that gets heavier with every service while many use cases — internal APIs, niche platform emulators, org-specific services — will never belong upstream.
The
@emulators/*packages already follow a plugin-shaped contract internally. This PR exposes that contract so external consumers can load their own services the same way:No fork required, no upstream PR needed for services that only matter to one team.
Longer term this opens the door to a Vercel Skills-style architecture: a thin core runtime with a community gallery of service plugins, where built-in services are just the default set rather than the only option.
Plugin contract
A plugin module exports:
plugin(or default export) — aServicePluginwithnameandregister(app)seedFromConfig,label,endpoints,defaultFallback,initConfigTest plan
createEmulatorAPIinitCommandgenerates config for an external plugin