feat: add example

.templates/rest-api/{{name.kebabCase}}-rest-api/errors/index.ts

@@ -0,0 +1,3 @@
+export { ApiError as {{name.pascalCase}}RestApiError } from '@biocad/{{name.kebabCase}}-rest-api-sdk'
+export { {{name.pascalCase}}RestApiTransportError } from './{{name.kebabCase}}-rest-api-transport.error'
+export type { {{name.pascalCase}}RestApiTransportErrorCode } from './{{name.kebabCase}}-rest-api-transport.error'

.templates/rest-api/{{name.kebabCase}}-rest-api/errors/{{name.kebabCase}}-rest-api-transport.error.ts

@@ -0,0 +1,20 @@
+/**
+ * Причина сбоя непосредственно на transport-границе {{name.pascalCase}} REST API.
+ */
+export type {{name.pascalCase}}RestApiTransportErrorCode = 'NETWORK_UNAVAILABLE' | 'REQUEST_TIMEOUT'
+
+/**
+ * Маркирует fetch failure, не смешивая его с TypeError из прикладного кода.
+ */
+export class {{name.pascalCase}}RestApiTransportError extends Error {
+  readonly code: {{name.pascalCase}}RestApiTransportErrorCode
+  readonly cause: unknown
+
+  constructor(code: {{name.pascalCase}}RestApiTransportErrorCode, cause: unknown) {
+    super(code)
+
+    this.name = '{{name.pascalCase}}RestApiTransportError'
+    this.code = code
+    this.cause = cause
+  }
+}