@salesforce/b2c-tooling-sdk / clients / createFallbackBackend

Function: createFallbackBackend()

createFallbackBackend<T>(scapi, ocapi, domainName): T

Defined in: packages/b2c-tooling-sdk/src/clients/scapi-fallback-backend.ts:107

Creates a fallback wrapper over scapi and ocapi backends.

The returned object presents the same interface as T. Method calls are intercepted: the first call tries SCAPI; on a safe fallback trigger it falls back to OCAPI. The choice is cached for the wrapper's lifetime.

Contract:

Both scapi and ocapi must implement T. TypeScript enforces this at the call site since both are typed as T.
Only methods of T are routed through the fallback logic. The name getter is special-cased to reflect the resolved backend.
Non-method properties are returned from the SCAPI target only and are not switched on fallback. By convention, backends should be method bags — any state beyond name should be encapsulated, not exposed.
Concurrency: if two calls race before resolution, both may attempt SCAPI. This is benign for read operations (idempotent retries) and acceptable for writes (both either succeed or fail with the same error). Each Proxy instance has its own state, so this concerns only shared use of a single wrapper.

Type Parameters

T

T extends BackendBase

Parameters

scapi

T

Primary (SCAPI) backend implementation

ocapi

T

Fallback (OCAPI) backend implementation

domainName

string

Used in fallback log messages, e.g. 'jobs'

Returns

T

A Proxy over scapi whose methods route through fallback logic

Example

const backend = createFallbackBackend<JobsBackend>(scapiJobs, ocapiJobs, 'jobs');
await backend.executeJob('my-job'); // tries SCAPI, may fall back to OCAPI