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{ lazyStream } from \"./api/lazy.ts\";\nimport { defaultProviderAuthContext as defaultAuthContext } from \"./auth/context.ts\";\nimport { InMemoryCredentialStore } from \"./auth/credential-store.ts\";\nimport { type AuthResolutionOverrides, ModelsError, resolveProviderAuth } from \"./auth/resolve.ts\";\nimport type {\n\tAuthCheck,\n\tAuthContext,\n\tAuthInteraction,\n\tAuthOperationOptions,\n\tAuthResult,\n\tAuthType,\n\tCredential,\n\tCredentialStore,\n\tProviderAuth,\n} from \"./auth/types.ts\";\nimport { InMemoryModelsStore, type ModelsStore, type ModelsStoreEntry } from \"./models-store.ts\";\nimport type {\n\tApi,\n\tApiStreamOptions,\n\tAssistantMessage,\n\tAssistantMessageEventStream,\n\tContext,\n\tDeferredCancelOptions,\n\tDeferredFetchOptions,\n\tDeferredHandle,\n\tModel,\n\tModelCostRates,\n\tModelThinkingLevel,\n\tProviderHeaders,\n\tProviderRequestOptions,\n\tProviderStreams,\n\tSimpleStreamOptions,\n\tUsage,\n} from \"./types.ts\";\nimport { operationSignal, raceWithAbortSignal } from \"./utils/abort.ts\";\n\nexport { ModelsError, type ModelsErrorCode } from \"./auth/resolve.ts\";\n\nexport interface ModelsPublication {\n\t/** Provider-selected persisted catalog. Omit to leave storage unchanged; null deletes it. */\n\tpersist?: ModelsStoreEntry | null;\n\t/** Optional synchronous update of provider-private in-memory catalog state. */\n\tupdate?: () => void;\n}\n\nexport interface RefreshModelsContext {\n\t/** Effective configured credential. OAuth credentials are refreshed before network access. */\n\tcredential?: Credential;\n\t/** Immutable provider-scoped catalog snapshot captured before this refresh phase. */\n\tstored?: Readonly<ModelsStoreEntry>;\n\t/**\n\t * Generation-checked publication. Persistence policy remains provider-owned;\n\t * the update runs synchronously only after the selected persistence mutation.\n\t */\n\tpublish(publication: ModelsPublication): Promise<boolean>;\n\t/** False during offline/cache-only initialization. */\n\tallowNetwork: boolean;\n\t/** Bypass provider freshness checks and fetch immediately when network access is allowed. */\n\tforce?: boolean;\n\t/** Always present, including when the public refresh caller omits its optional signal. */\n\tsignal: AbortSignal;\n}\n\nexport interface ModelsRefreshOptions {\n\tallowNetwork?: boolean;\n\t/** Restrict refresh to these provider IDs. Unknown and static providers are ignored. */\n\tproviders?: readonly string[];\n\t/** Bypass provider freshness checks and fetch immediately when network access is allowed. */\n\tforce?: boolean;\n\tsignal?: AbortSignal;\n}\n\nexport interface ModelsRefreshResult {\n\taborted: boolean;\n\terrors: ReadonlyMap<string, Error>;\n}\n\nexport interface ModelsRequestTransforms {\n\t/** Transform fully assembled model/auth/request headers before provider dispatch. */\n\ttransformHeaders?: (headers: ProviderHeaders) => ProviderHeaders | Promise<ProviderHeaders>;\n}\n\nexport type ModelsApiStreamOptions<TApi extends Api> = ApiStreamOptions<TApi> & ModelsRequestTransforms;\nexport type ModelsSimpleStreamOptions = SimpleStreamOptions & ModelsRequestTransforms;\nexport type ModelsDeferredFetchOptions = DeferredFetchOptions & ModelsRequestTransforms;\nexport type ModelsDeferredCancelOptions = DeferredCancelOptions & ModelsRequestTransforms;\n\n/**\n * A provider is the concrete runtime unit. It owns id/name/base metadata,\n * auth methods, model listing, and stream behavior.\n *\n * `TApi` lets concrete provider factories declare which APIs their models\n * use (e.g. `openaiProvider(): Provider<\"openai-responses\" | \"openai-completions\">`),\n * giving typed model lists to direct factory users. Inside a `Models`\n * collection providers are held as `Provider<Api>`.\n */\nexport interface Provider<TApi extends Api = Api> {\n\treadonly id: string;\n\treadonly name: string;\n\n\treadonly baseUrl?: string;\n\treadonly headers?: ProviderHeaders;\n\n\t/**\n\t * Required: at least one of `apiKey`/`oauth`. Every provider has auth\n\t * semantics — even providers with only ambient credentials (env vars, AWS\n\t * profiles, ADC files) and keyless local servers provide `apiKey` auth\n\t * whose `resolve()` reports whether the provider is configured.\n\t * `Models.getAuth()` returns undefined when the provider is unconfigured.\n\t */\n\treadonly auth: ProviderAuth;\n\n\t/**\n\t * Current known models, sync. Static providers return their catalog;\n\t * dynamic providers return the list as of the last `refreshModels()`\n\t * (empty before the first). Must not throw; `Models` treats a throwing\n\t * implementation as having no models.\n\t */\n\tgetModels(): readonly Model<TApi>[];\n\n\t/**\n\t * Dynamic providers only: restore `context.stored` and optionally fetch a newer list using\n\t * the effective credential. Implementations retain their previous list on failure, publish\n\t * persistence and synchronous state changes through `context.publish()`, and honor the\n\t * shared abort signal for blocking work.\n\t */\n\trefreshModels?(context: RefreshModelsContext): Promise<void>;\n\n\t/**\n\t * Optional provider policy for credential-specific model availability.\n\t * `getModels()` remains the complete synchronous catalog; `Models.getAvailable()`\n\t * applies this filter after confirming that provider auth is configured.\n\t */\n\tfilterModels?(models: readonly Model<TApi>[], credential: Credential | undefined): readonly Model<TApi>[];\n\n\tstream<T extends TApi>(\n\t\tmodel: Model<T>,\n\t\tcontext: Context,\n\t\toptions?: ApiStreamOptions<T>,\n\t): AssistantMessageEventStream;\n\n\tstreamSimple(model: Model<TApi>, context: Context, options?: SimpleStreamOptions): AssistantMessageEventStream;\n\tfetchDeferred?(\n\t\tmodel: Model<TApi>,\n\t\thandle: DeferredHandle,\n\t\toptions?: DeferredFetchOptions,\n\t): AssistantMessageEventStream;\n\tcancelDeferred?(model: Model<TApi>, handle: DeferredHandle, options?: DeferredCancelOptions): Promise<void>;\n}\n\n/**\n * Runtime collection of providers plus auth application and stream\n * convenience. Providers own stream behavior; `Models` resolves auth and\n * delegates each request to the provider that owns the model.\n */\nexport interface Models {\n\tgetProviders(): readonly Provider[];\n\tgetProvider(id: string): Provider | undefined;\n\n\t/**\n\t * Sync read of last-known models from one provider or all providers.\n\t * Best-effort: a provider whose `getModels()` throws yields no models.\n\t */\n\tgetModels(provider?: string): readonly Model<Api>[];\n\n\t/**\n\t * Sync runtime model lookup against last-known lists. Dynamic model lists\n\t * are typed as `Model<Api>`; narrow with the `hasApi()` type guard.\n\t */\n\tgetModel(provider: string, id: string): Model<Api> | undefined;\n\n\t/**\n\t * Refresh selected configured dynamic providers concurrently (all when `providers` is omitted).\n\t * Provider errors and cancellation are returned without rejecting; static, unknown, and\n\t * unconfigured providers are skipped.\n\t */\n\trefresh(options?: ModelsRefreshOptions): Promise<ModelsRefreshResult>;\n\n\t/** Check whether a provider has complete auth configuration without refreshing OAuth. */\n\tcheckAuth(providerId: string, options?: AuthOperationOptions): Promise<AuthCheck | undefined>;\n\n\t/** Return models whose providers have complete auth configuration. */\n\tgetAvailable(providerId?: string, options?: AuthOperationOptions): Promise<readonly Model<Api>[]>;\n\n\t/**\n\t * Resolve provider-scoped auth by provider id, or provider auth plus static\n\t * model headers when passed a model. Includes a source label for status UI.\n\t * Resolves `undefined` when the provider is unknown or unconfigured.\n\t * Rejects with `ModelsError`: code \"oauth\" when a token refresh fails (the\n\t * stored credential is preserved for retry; re-login fixes it), code \"auth\"\n\t * when api-key resolution or the credential store fails. Request paths\n\t * surface rejections as stream errors.\n\t */\n\tgetAuth(providerId: string, overrides?: AuthResolutionOverrides): Promise<AuthResult | undefined>;\n\tgetAuth(model: Model<Api>, overrides?: AuthResolutionOverrides): Promise<AuthResult | undefined>;\n\n\t/** Run a provider-owned login flow and persist its returned credential. */\n\tlogin(providerId: string, type: AuthType, interaction: AuthInteraction): Promise<Credential>;\n\n\t/** Remove the stored credential for a provider. */\n\tlogout(providerId: string, options?: AuthOperationOptions): Promise<void>;\n\n\tstream<TApi extends Api>(\n\t\tmodel: Model<TApi>,\n\t\tcontext: Context,\n\t\toptions?: ModelsApiStreamOptions<TApi>,\n\t): AssistantMessageEventStream;\n\n\tcomplete<TApi extends Api>(\n\t\tmodel: Model<TApi>,\n\t\tcontext: Context,\n\t\toptions?: ModelsApiStreamOptions<TApi>,\n\t): Promise<AssistantMessage>;\n\n\tstreamSimple(model: Model<Api>, context: Context, options?: ModelsSimpleStreamOptions): AssistantMessageEventStream;\n\tcompleteSimple(model: Model<Api>, context: Context, options?: ModelsSimpleStreamOptions): Promise<AssistantMessage>;\n\tfetchDeferred(\n\t\tmodel: Model<Api>,\n\t\thandle: DeferredHandle,\n\t\toptions?: ModelsDeferredFetchOptions,\n\t): Promise<AssistantMessage>;\n\tcancelDeferred(model: Model<Api>, handle: DeferredHandle, options?: ModelsDeferredCancelOptions): Promise<void>;\n}\n\nexport interface MutableModels extends Models {\n\t/** Upsert/replace by provider.id. Provider ids are unique. */\n\tsetProvider(provider: Provider): void;\n\tdeleteProvider(id: string): void;\n\tclearProviders(): void;\n}\n\nexport interface CreateModelsOptions {\n\tcredentials?: CredentialStore;\n\tmodelsStore?: ModelsStore;\n\tauthContext?: AuthContext;\n}\n\nfunction mergeHeaders(\n\tbase: ProviderHeaders | undefined,\n\toverride: ProviderHeaders | undefined,\n): ProviderHeaders | undefined {\n\tif (!base && !override) return undefined;\n\tconst merged = { ...base };\n\tfor (const [name, value] of Object.entries(override ?? {})) {\n\t\tconst lowerName = name.toLowerCase();\n\t\tfor (const existingName of Object.keys(merged)) {\n\t\t\tif (existingName.toLowerCase() === lowerName) delete merged[existingName];\n\t\t}\n\t\tmerged[name] = value;\n\t}\n\treturn merged;\n}\n\nclass ModelsImpl implements MutableModels {\n\tprivate providers = new Map<string, Provider>();\n\tprivate credentials: CredentialStore;\n\tprivate modelsStore: ModelsStore;\n\tprivate authContext: AuthContext;\n\tprivate refreshGenerations = new Map<string, number>();\n\tprivate refreshControllers = new Map<string, AbortController>();\n\tprivate publicationChains = new Map<string, Promise<unknown>>();\n\n\tconstructor(options?: CreateModelsOptions) {\n\t\tthis.credentials = options?.credentials ?? new InMemoryCredentialStore();\n\t\tthis.modelsStore = options?.modelsStore ?? new InMemoryModelsStore();\n\t\tthis.authContext = options?.authContext ?? defaultAuthContext();\n\t}\n\n\tsetProvider(provider: Provider): void {\n\t\tthis.supersedeProviderRefresh(provider.id);\n\t\tthis.providers.set(provider.id, provider);\n\t}\n\n\tdeleteProvider(id: string): void {\n\t\tthis.supersedeProviderRefresh(id);\n\t\tthis.providers.delete(id);\n\t}\n\n\tclearProviders(): void {\n\t\tfor (const id of new Set([...this.providers.keys(), ...this.refreshControllers.keys()])) {\n\t\t\tthis.supersedeProviderRefresh(id);\n\t\t}\n\t\tthis.providers.clear();\n\t}\n\n\tgetProviders(): readonly Provider[] {\n\t\treturn Array.from(this.providers.values());\n\t}\n\n\tgetProvider(id: string): Provider | undefined {\n\t\treturn this.providers.get(id);\n\t}\n\n\tgetModels(provider?: string): readonly Model<Api>[] {\n\t\tif (provider !== undefined) {\n\t\t\tconst entry = this.providers.get(provider);\n\t\t\tif (!entry) return [];\n\t\t\ttry {\n\t\t\t\treturn entry.getModels();\n\t\t\t} catch {\n\t\t\t\treturn [];\n\t\t\t}\n\t\t}\n\n\t\tconst models: Model<Api>[] = [];\n\t\tfor (const entry of this.providers.values()) {\n\t\t\ttry {\n\t\t\t\tmodels.push(...entry.getModels());\n\t\t\t} catch {\n\t\t\t\t// Best-effort: ill-behaved providers yield no models.\n\t\t\t}\n\t\t}\n\t\treturn models;\n\t}\n\n\tgetModel(provider: string, id: string): Model<Api> | undefined {\n\t\treturn this.getModels(provider).find((model) => model.id === id);\n\t}\n\n\tprivate supersedeProviderRefresh(providerId: string): number {\n\t\tconst generation = (this.refreshGenerations.get(providerId) ?? 0) + 1;\n\t\tthis.refreshGenerations.set(providerId, generation);\n\t\tconst previous = this.refreshControllers.get(providerId);\n\t\tif (previous) {\n\t\t\tthis.refreshControllers.delete(providerId);\n\t\t\tprevious.abort();\n\t\t}\n\t\treturn generation;\n\t}\n\n\tprivate beginProviderRefresh(providerId: string): { generation: number; controller: AbortController } {\n\t\tconst generation = this.supersedeProviderRefresh(providerId);\n\t\tconst controller = new AbortController();\n\t\tthis.refreshControllers.set(providerId, controller);\n\t\treturn { generation, controller };\n\t}\n\n\tprivate publishProviderModels(\n\t\tproviderId: string,\n\t\tgeneration: number,\n\t\tsignal: AbortSignal,\n\t\tpublication: ModelsPublication,\n\t): Promise<boolean> {\n\t\tconst previous = this.publicationChains.get(providerId) ?? Promise.resolve();\n\t\tconst queued = (async () => {\n\t\t\tawait previous.catch(() => {});\n\t\t\tif (signal.aborted || this.refreshGenerations.get(providerId) !== generation) return false;\n\n\t\t\tif (publication.persist === null) {\n\t\t\t\tawait this.modelsStore.delete(providerId, { signal });\n\t\t\t} else if (publication.persist !== undefined) {\n\t\t\t\tawait this.modelsStore.write(providerId, structuredClone(publication.persist), { signal });\n\t\t\t}\n\n\t\t\tif (signal.aborted || this.refreshGenerations.get(providerId) !== generation) return false;\n\t\t\tpublication.update?.();\n\t\t\treturn true;\n\t\t})();\n\t\tconst tail = queued.catch(() => {});\n\t\tthis.publicationChains.set(providerId, tail);\n\t\tvoid tail.then(() => {\n\t\t\tif (this.publicationChains.get(providerId) === tail) this.publicationChains.delete(providerId);\n\t\t});\n\t\treturn raceWithAbortSignal(queued, signal);\n\t}\n\n\tprivate async runProviderRefreshPhase(\n\t\tprovider: Provider & Required<Pick<Provider, \"refreshModels\">>,\n\t\tcredential: Credential | undefined,\n\t\tallowNetwork: boolean,\n\t\tforce: boolean | undefined,\n\t\tgeneration: number,\n\t\tsignal: AbortSignal,\n\t): Promise<void> {\n\t\tconst stored = await this.modelsStore.read(provider.id, { signal });\n\t\tawait provider.refreshModels({\n\t\t\tcredential,\n\t\t\tstored: stored ? structuredClone(stored) : undefined,\n\t\t\tpublish: (publication) => this.publishProviderModels(provider.id, generation, signal, publication),\n\t\t\tallowNetwork,\n\t\t\tforce: allowNetwork ? force : undefined,\n\t\t\tsignal,\n\t\t});\n\t}\n\n\tasync refresh(options: ModelsRefreshOptions = {}): Promise<ModelsRefreshResult> {\n\t\tconst allowNetwork = options.allowNetwork ?? true;\n\t\tconst callerSignal = operationSignal(options.signal);\n\t\tconst errors = new Map<string, Error>();\n\t\tif (callerSignal.aborted) return { aborted: true, errors };\n\t\tconst selected = options.providers ? new Set(options.providers) : undefined;\n\t\tconst refreshable = Array.from(this.providers.values()).filter(\n\t\t\t(provider): provider is Provider & Required<Pick<Provider, \"refreshModels\">> =>\n\t\t\t\tprovider.refreshModels !== undefined && (!selected || selected.has(provider.id)),\n\t\t);\n\n\t\tconst refresh = Promise.all(\n\t\t\trefreshable.map(async (provider) => {\n\t\t\t\tconst { generation, controller } = this.beginProviderRefresh(provider.id);\n\t\t\t\tconst signal = AbortSignal.any([callerSignal, controller.signal]);\n\t\t\t\tconst operation = (async () => {\n\t\t\t\t\tlet storedCredential: Credential | undefined;\n\t\t\t\t\tlet credentialError: unknown;\n\t\t\t\t\ttry {\n\t\t\t\t\t\tstoredCredential = await this.readCredential(provider.id, signal);\n\t\t\t\t\t} catch (error) {\n\t\t\t\t\t\tcredentialError = error;\n\t\t\t\t\t}\n\n\t\t\t\t\t// Restore cached provider state before auth resolution or network access.\n\t\t\t\t\tawait this.runProviderRefreshPhase(provider, storedCredential, false, undefined, generation, signal);\n\t\t\t\t\tif (credentialError !== undefined) throw credentialError;\n\t\t\t\t\tif (!allowNetwork || signal.aborted) return;\n\n\t\t\t\t\tconst credential = await this.resolveRefreshCredential(provider, storedCredential, signal);\n\t\t\t\t\tif (!credential) return;\n\t\t\t\t\tawait this.runProviderRefreshPhase(provider, credential, true, options.force, generation, signal);\n\t\t\t\t})();\n\n\t\t\t\ttry {\n\t\t\t\t\tawait raceWithAbortSignal(operation, signal);\n\t\t\t\t} catch (error) {\n\t\t\t\t\tif (!signal.aborted) {\n\t\t\t\t\t\terrors.set(\n\t\t\t\t\t\t\tprovider.id,\n\t\t\t\t\t\t\terror instanceof Error\n\t\t\t\t\t\t\t\t? error\n\t\t\t\t\t\t\t\t: new ModelsError(\"model_source\", `Model refresh failed for ${provider.id}`, { cause: error }),\n\t\t\t\t\t\t);\n\t\t\t\t\t}\n\t\t\t\t} finally {\n\t\t\t\t\tif (this.refreshControllers.get(provider.id) === controller) {\n\t\t\t\t\t\tthis.refreshControllers.delete(provider.id);\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}),\n\t\t);\n\n\t\ttry {\n\t\t\tawait raceWithAbortSignal(refresh, callerSignal);\n\t\t} catch (error) {\n\t\t\tif (!callerSignal.aborted) throw error;\n\t\t}\n\n\t\treturn { aborted: callerSignal.aborted, errors: new Map(errors) };\n\t}\n\n\tprivate async resolveRefreshCredential(\n\t\tprovider: Provider,\n\t\tstored: Credential | undefined,\n\t\tsignal: AbortSignal,\n\t): Promise<Credential | undefined> {\n\t\tif (stored?.type === \"oauth\") {\n\t\t\tconst oauth = provider.auth.oauth;\n\t\t\tif (!oauth) return undefined;\n\t\t\tif (Date.now() < stored.expires) return stored;\n\t\t\tif (signal.aborted) return undefined;\n\t\t\tconst post = await this.credentials.modify(\n\t\t\t\tprovider.id,\n\t\t\t\tasync (current) => {\n\t\t\t\t\tif (current?.type !== \"oauth\" || Date.now() < current.expires) return undefined;\n\t\t\t\t\treturn oauth.refresh(current, signal);\n\t\t\t\t},\n\t\t\t\t{ signal },\n\t\t\t);\n\t\t\treturn post?.type === \"oauth\" ? post : undefined;\n\t\t}\n\n\t\tconst apiKey = provider.auth.apiKey;\n\t\tif (!apiKey) return undefined;\n\t\tconst credential = stored?.type === \"api_key\" ? stored : undefined;\n\t\tconst result = await apiKey.resolve({ ctx: this.authContext, credential, signal });\n\t\tif (!result) return undefined;\n\t\treturn { type: \"api_key\", key: result.auth.apiKey, env: result.env };\n\t}\n\n\tprivate async readCredential(providerId: string, signal: AbortSignal): Promise<Credential | undefined> {\n\t\ttry {\n\t\t\treturn await this.credentials.read(providerId, { signal });\n\t\t} catch (error) {\n\t\t\tthrow new ModelsError(\"auth\", `Credential store read failed for ${providerId}`, { cause: error });\n\t\t}\n\t}\n\n\tprivate async checkProviderAuth(\n\t\tprovider: Provider,\n\t\tcredential: Credential | undefined,\n\t\tsignal: AbortSignal,\n\t): Promise<AuthCheck | undefined> {\n\t\tif (credential?.type === \"oauth\") {\n\t\t\treturn provider.auth.oauth ? { source: \"OAuth\", type: \"oauth\" } : undefined;\n\t\t}\n\t\tconst apiKey = provider.auth.apiKey;\n\t\tif (!apiKey) return undefined;\n\t\tif (apiKey.check) {\n\t\t\ttry {\n\t\t\t\treturn await apiKey.check({\n\t\t\t\t\tctx: this.authContext,\n\t\t\t\t\tcredential: credential?.type === \"api_key\" ? credential : undefined,\n\t\t\t\t\tsignal,\n\t\t\t\t});\n\t\t\t} catch (error) {\n\t\t\t\tthrow new ModelsError(\"auth\", `API key auth check failed for provider ${provider.id}`, { cause: error });\n\t\t\t}\n\t\t}\n\n\t\tconst resolution = await resolveProviderAuth(provider, this.credentials, this.authContext, { signal });\n\t\treturn resolution ? { source: resolution.source, type: \"api_key\" } : undefined;\n\t}\n\n\tcheckAuth(providerId: string, options?: AuthOperationOptions): Promise<AuthCheck | undefined> {\n\t\tconst signal = operationSignal(options?.signal);\n\t\tconst check = (async () => {\n\t\t\tsignal.throwIfAborted();\n\t\t\tconst provider = this.providers.get(providerId);\n\t\t\tif (!provider) return undefined;\n\t\t\treturn this.checkProviderAuth(provider, await this.readCredential(providerId, signal), signal);\n\t\t})();\n\t\treturn raceWithAbortSignal(check, signal);\n\t}\n\n\tgetAvailable(providerId?: string, options?: AuthOperationOptions): Promise<readonly Model<Api>[]> {\n\t\tconst signal = operationSignal(options?.signal);\n\t\tconst available = (async () => {\n\t\t\tsignal.throwIfAborted();\n\t\t\tconst providers = providerId\n\t\t\t\t? [this.providers.get(providerId)].filter((entry) => entry !== undefined)\n\t\t\t\t: this.getProviders();\n\t\t\tconst checks = await Promise.all(\n\t\t\t\tproviders.map(async (provider) => {\n\t\t\t\t\tconst credential = await this.readCredential(provider.id, signal);\n\t\t\t\t\treturn { provider, credential, auth: await this.checkProviderAuth(provider, credential, signal) };\n\t\t\t\t}),\n\t\t\t);\n\t\t\treturn checks.flatMap(({ provider, credential, auth }) => {\n\t\t\t\tif (!auth) return [];\n\t\t\t\tconst models = provider.getModels();\n\t\t\t\treturn provider.filterModels?.(models, credential) ?? models;\n\t\t\t});\n\t\t})();\n\t\treturn raceWithAbortSignal(available, signal);\n\t}\n\n\tgetAuth(providerId: string, overrides?: AuthResolutionOverrides): Promise<AuthResult | undefined>;\n\tgetAuth(model: Model<Api>, overrides?: AuthResolutionOverrides): Promise<AuthResult | undefined>;\n\tasync getAuth(\n\t\tproviderOrModel: string | Model<Api>,\n\t\toverrides?: AuthResolutionOverrides,\n\t): Promise<AuthResult | undefined> {\n\t\tconst signal = operationSignal(overrides?.signal);\n\t\tconst providerId = typeof providerOrModel === \"string\" ? providerOrModel : providerOrModel.provider;\n\t\tconst provider = this.providers.get(providerId);\n\t\tif (!provider) return undefined;\n\t\tconst result = await resolveProviderAuth(provider, this.credentials, this.authContext, { ...overrides, signal });\n\t\tif (!result || typeof providerOrModel === \"string\" || !providerOrModel.headers) return result;\n\t\treturn {\n\t\t\t...result,\n\t\t\tauth: {\n\t\t\t\t...result.auth,\n\t\t\t\theaders: mergeHeaders(result.auth.headers, providerOrModel.headers),\n\t\t\t},\n\t\t};\n\t}\n\n\tasync login(providerId: string, type: AuthType, interaction: AuthInteraction): Promise<Credential> {\n\t\tconst signal = operationSignal(interaction.signal);\n\t\tsignal.throwIfAborted();\n\t\tconst provider = this.providers.get(providerId);\n\t\tif (!provider) throw new ModelsError(\"provider\", `Unknown provider: ${providerId}`);\n\t\tconst method = type === \"oauth\" ? provider.auth.oauth : provider.auth.apiKey;\n\t\tif (!method?.login) {\n\t\t\tthrow new ModelsError(\"auth\", `${provider.name} does not support ${type} login`);\n\t\t}\n\t\tconst loginOperation: Promise<Credential> = method.login({ ...interaction, signal });\n\t\tconst credential = await raceWithAbortSignal(loginOperation, signal);\n\t\tlet mutationStarted = false;\n\t\tlet markMutationStarted: (() => void) | undefined;\n\t\tconst started = new Promise<void>((resolve) => {\n\t\t\tmarkMutationStarted = resolve;\n\t\t});\n\t\tconst mutation = this.credentials.modify(\n\t\t\tproviderId,\n\t\t\tasync () => {\n\t\t\t\tmutationStarted = true;\n\t\t\t\tmarkMutationStarted?.();\n\t\t\t\treturn credential;\n\t\t\t},\n\t\t\t{ signal },\n\t\t);\n\t\tvoid mutation.catch(() => {});\n\t\ttry {\n\t\t\tawait new Promise<void>((resolve, reject) => {\n\t\t\t\tconst onAbort = () => {\n\t\t\t\t\tif (!mutationStarted) reject(signal.reason);\n\t\t\t\t};\n\t\t\t\tsignal.addEventListener(\"abort\", onAbort, { once: true });\n\t\t\t\tvoid Promise.race([started, mutation]).then(\n\t\t\t\t\t() => {\n\t\t\t\t\t\tsignal.removeEventListener(\"abort\", onAbort);\n\t\t\t\t\t\tresolve();\n\t\t\t\t\t},\n\t\t\t\t\t(error: unknown) => {\n\t\t\t\t\t\tsignal.removeEventListener(\"abort\", onAbort);\n\t\t\t\t\t\treject(error);\n\t\t\t\t\t},\n\t\t\t\t);\n\t\t\t\tif (signal.aborted) onAbort();\n\t\t\t});\n\t\t\tawait mutation;\n\t\t} catch (error) {\n\t\t\tsignal.throwIfAborted();\n\t\t\tthrow new ModelsError(\"auth\", `Credential store modify failed for ${providerId}`, { cause: error });\n\t\t}\n\t\treturn credential;\n\t}\n\n\tasync logout(providerId: string, options?: AuthOperationOptions): Promise<void> {\n\t\tconst signal = operationSignal(options?.signal);\n\t\tsignal.throwIfAborted();\n\t\ttry {\n\t\t\tawait this.credentials.delete(providerId, { signal });\n\t\t} catch (error) {\n\t\t\tsignal.throwIfAborted();\n\t\t\tthrow new ModelsError(\"auth\", `Credential store delete failed for ${providerId}`, { cause: error });\n\t\t}\n\t}\n\n\tprivate requireProvider(model: Model<Api>): Provider {\n\t\tconst provider = this.providers.get(model.provider);\n\t\tif (!provider) {\n\t\t\tthrow new ModelsError(\"provider\", `Unknown provider: ${model.provider}`);\n\t\t}\n\t\treturn provider;\n\t}\n\n\tprivate async applyAuth<TOptions extends ProviderRequestOptions & ModelsRequestTransforms>(\n\t\tmodel: Model<Api>,\n\t\toptions: TOptions | undefined,\n\t): Promise<{\n\t\trequestModel: Model<Api>;\n\t\trequestOptions: Omit<TOptions, \"transformHeaders\"> & ProviderRequestOptions;\n\t}> {\n\t\tthis.requireProvider(model);\n\t\tconst resolution = await this.getAuth(model, {\n\t\t\tapiKey: options?.apiKey,\n\t\t\tenv: options?.env,\n\t\t\tsignal: options?.signal,\n\t\t});\n\t\tif (!resolution) {\n\t\t\tthrow new ModelsError(\"auth\", `Provider is not configured: ${model.provider}`);\n\t\t}\n\t\tconst auth = resolution.auth;\n\n\t\t// Explicit request options win per-field; the Models-only transform runs last.\n\t\tconst apiKey = options?.apiKey ?? auth.apiKey;\n\t\tlet headers = mergeHeaders(auth.headers, options?.headers);\n\t\tif (options?.transformHeaders) headers = await options.transformHeaders(headers ?? {});\n\t\tconst env = resolution.env || options?.env ? { ...(resolution.env ?? {}), ...(options?.env ?? {}) } : undefined;\n\t\tconst requestModel = auth.baseUrl ? { ...model, baseUrl: auth.baseUrl } : model;\n\t\tconst { transformHeaders: _transformHeaders, ...providerOptions } = options ?? {};\n\t\tconst requestOptions = { ...providerOptions, apiKey, headers, env } as Omit<TOptions, \"transformHeaders\"> &\n\t\t\tProviderRequestOptions;\n\n\t\treturn { requestModel, requestOptions };\n\t}\n\n\tstream<TApi extends Api>(\n\t\tmodel: Model<TApi>,\n\t\tcontext: Context,\n\t\toptions?: ModelsApiStreamOptions<TApi>,\n\t): AssistantMessageEventStream {\n\t\treturn lazyStream(model, async () => {\n\t\t\tconst provider = this.requireProvider(model);\n\t\t\tconst { requestModel, requestOptions } = await this.applyAuth(\n\t\t\t\tmodel,\n\t\t\t\toptions as ModelsApiStreamOptions<Api> | undefined,\n\t\t\t);\n\t\t\treturn provider.stream(requestModel as Model<TApi>, context, requestOptions as ApiStreamOptions<TApi>);\n\t\t});\n\t}\n\n\tasync complete<TApi extends Api>(\n\t\tmodel: Model<TApi>,\n\t\tcontext: Context,\n\t\toptions?: ModelsApiStreamOptions<TApi>,\n\t): Promise<AssistantMessage> {\n\t\treturn this.stream(model, context, options).result();\n\t}\n\n\tstreamSimple(model: Model<Api>, context: Context, options?: ModelsSimpleStreamOptions): AssistantMessageEventStream {\n\t\treturn lazyStream(model, async () => {\n\t\t\tconst provider = this.requireProvider(model);\n\t\t\tconst { requestModel, requestOptions } = await this.applyAuth(model, options);\n\t\t\treturn provider.streamSimple(requestModel, context, requestOptions as SimpleStreamOptions);\n\t\t});\n\t}\n\n\tasync completeSimple(\n\t\tmodel: Model<Api>,\n\t\tcontext: Context,\n\t\toptions?: ModelsSimpleStreamOptions,\n\t): Promise<AssistantMessage> {\n\t\treturn this.streamSimple(model, context, options).result();\n\t}\n\n\tasync fetchDeferred(\n\t\tmodel: Model<Api>,\n\t\thandle: DeferredHandle,\n\t\toptions?: ModelsDeferredFetchOptions,\n\t): Promise<AssistantMessage> {\n\t\treturn lazyStream(model, async () => {\n\t\t\tconst provider = this.requireProvider(model);\n\t\t\tif (!provider.fetchDeferred) {\n\t\t\t\tthrow new ModelsError(\"provider\", `Provider ${model.provider} does not support deferred responses`);\n\t\t\t}\n\t\t\tconst { requestModel, requestOptions } = await this.applyAuth(model, options);\n\t\t\treturn provider.fetchDeferred(requestModel, handle, requestOptions as DeferredFetchOptions);\n\t\t}).result();\n\t}\n\n\tasync cancelDeferred(\n\t\tmodel: Model<Api>,\n\t\thandle: DeferredHandle,\n\t\toptions?: ModelsDeferredCancelOptions,\n\t): Promise<void> {\n\t\tconst provider = this.requireProvider(model);\n\t\tif (!provider.cancelDeferred) {\n\t\t\tthrow new ModelsError(\"provider\", `Provider ${model.provider} does not support deferred responses`);\n\t\t}\n\t\tconst { requestModel, requestOptions } = await this.applyAuth(model, options);\n\t\tawait provider.cancelDeferred(requestModel, handle, requestOptions);\n\t}\n}\n\nexport function createModels(options?: CreateModelsOptions): MutableModels {\n\treturn new ModelsImpl(options);\n}\n\nexport interface CreateProviderOptions<TApi extends Api = Api> {\n\tid: string;\n\t/** Display name. Default: `id`. */\n\tname?: string;\n\tbaseUrl?: string;\n\theaders?: ProviderHeaders;\n\t/** Required — every provider has auth semantics, even ambient/keyless ones. */\n\tauth: ProviderAuth;\n\t/** Static baseline model list (empty for purely dynamic providers). */\n\tmodels: readonly Model<TApi>[];\n\t/** Fetch a dynamic model overlay. createProvider restores and publishes it transactionally. */\n\tfetchModels?: (context: RefreshModelsContext) => Promise<readonly Model<TApi>[]>;\n\tfilterModels?: (models: readonly Model<TApi>[], credential: Credential | undefined) => readonly Model<TApi>[];\n\t/** Single implementation, or map keyed by `model.api` for mixed-API providers. */\n\tapi: ProviderStreams | Partial<Record<TApi, ProviderStreams>>;\n}\n\n/**\n * Builds a provider from parts. Built-in provider factories and models.json\n * custom providers both go through this. A single `api` streams all models;\n * an `api` map dispatches on `model.api`, and a model whose api has no entry\n * produces a stream error.\n */\nexport function createProvider<TApi extends Api = Api>(input: CreateProviderOptions<TApi>): Provider<TApi> {\n\tconst baselineModels = input.models;\n\tlet dynamicModels: readonly Model<TApi>[] = [];\n\tconst fetchModels = input.fetchModels;\n\tconst currentModels = (): readonly Model<TApi>[] => {\n\t\tconst merged = [...baselineModels];\n\t\tfor (const model of dynamicModels) {\n\t\t\tconst index = merged.findIndex((entry) => entry.id === model.id);\n\t\t\tif (index >= 0) merged[index] = model;\n\t\t\telse merged.push(model);\n\t\t}\n\t\treturn merged;\n\t};\n\tconst single =\n\t\ttypeof (input.api as ProviderStreams).stream === \"function\" ? (input.api as ProviderStreams) : undefined;\n\tconst byApi = single ? undefined : (input.api as Partial<Record<string, ProviderStreams>>);\n\n\tconst apiFor = (model: Model<Api>): ProviderStreams | undefined => single ?? byApi?.[model.api];\n\n\tconst dispatch = (\n\t\tmodel: Model<Api>,\n\t\trun: (streams: ProviderStreams) => AssistantMessageEventStream,\n\t): AssistantMessageEventStream => {\n\t\tconst streams = apiFor(model);\n\t\tif (!streams) {\n\t\t\treturn lazyStream(model, async () => {\n\t\t\t\tthrow new ModelsError(\"stream\", `Provider ${input.id} has no API implementation for \"${model.api}\"`);\n\t\t\t});\n\t\t}\n\t\treturn run(streams);\n\t};\n\n\tconst provider: Provider<TApi> = {\n\t\tid: input.id,\n\t\tname: input.name ?? input.id,\n\t\tbaseUrl: input.baseUrl,\n\t\theaders: input.headers,\n\t\tauth: input.auth,\n\t\tgetModels: currentModels,\n\t\trefreshModels: fetchModels\n\t\t\t? async (context) => {\n\t\t\t\t\tif (context.stored) {\n\t\t\t\t\t\tconst restored = context.stored.models\n\t\t\t\t\t\t\t.filter((model) => model.provider === input.id)\n\t\t\t\t\t\t\t.map((model) => model as Model<TApi>);\n\t\t\t\t\t\tif (\n\t\t\t\t\t\t\t!(await context.publish({\n\t\t\t\t\t\t\t\tupdate: () => {\n\t\t\t\t\t\t\t\t\tdynamicModels = restored;\n\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t}))\n\t\t\t\t\t\t) {\n\t\t\t\t\t\t\treturn;\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\tif (!context.allowNetwork || context.signal.aborted) return;\n\t\t\t\t\tconst refreshed = await fetchModels(context);\n\t\t\t\t\tif (context.signal.aborted) return;\n\t\t\t\t\tawait context.publish({\n\t\t\t\t\t\tpersist: { models: refreshed, checkedAt: Date.now() },\n\t\t\t\t\t\tupdate: () => {\n\t\t\t\t\t\t\tdynamicModels = refreshed;\n\t\t\t\t\t\t},\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t: undefined,\n\t\tfilterModels: input.filterModels,\n\t\tstream: (model, context, options) => dispatch(model, (streams) => streams.stream(model, context, options)),\n\t\tstreamSimple: (model, context, options) =>\n\t\t\tdispatch(model, (streams) => streams.streamSimple(model, context, options)),\n\t};\n\n\tconst streams = single ? [single] : Object.values(byApi ?? {}).filter((entry) => entry !== undefined);\n\tif (streams.some((entry) => entry.fetchDeferred !== undefined)) {\n\t\tprovider.fetchDeferred = (model, handle, options) =>\n\t\t\tlazyStream(model, async () => {\n\t\t\t\tconst implementation = apiFor(model);\n\t\t\t\tif (!implementation?.fetchDeferred) {\n\t\t\t\t\tthrow new ModelsError(\n\t\t\t\t\t\t\"provider\",\n\t\t\t\t\t\t`Provider ${input.id} does not support deferred responses for \"${model.api}\"`,\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t\treturn implementation.fetchDeferred(model, handle, options);\n\t\t\t});\n\t}\n\tif (streams.some((entry) => entry.cancelDeferred !== undefined)) {\n\t\tprovider.cancelDeferred = async (model, handle, options) => {\n\t\t\tconst implementation = apiFor(model);\n\t\t\tif (!implementation?.cancelDeferred) {\n\t\t\t\tthrow new ModelsError(\n\t\t\t\t\t\"provider\",\n\t\t\t\t\t`Provider ${input.id} cannot cancel deferred responses for \"${model.api}\"`,\n\t\t\t\t);\n\t\t\t}\n\t\t\tawait implementation.cancelDeferred(model, handle, options);\n\t\t};\n\t}\n\n\treturn provider;\n}\n\n/**\n * Runtime-checked narrowing for dynamically looked-up models:\n *\n * ```ts\n * const model = models.getModel(\"anthropic\", \"claude-opus-4-7\");\n * if (model && hasApi(model, \"anthropic-messages\")) {\n *   // model: Model<\"anthropic-messages\">, stream options fully typed\n * }\n * ```\n */\nexport function hasApi<TApi extends Api>(model: Model<Api>, api: TApi): model is Model<TApi> {\n\treturn model.api === api;\n}\n\nexport function calculateCost<TApi extends Api>(model: Model<TApi>, usage: Usage): Usage[\"cost\"] {\n\tconst inputTokens = usage.input + usage.cacheRead + usage.cacheWrite;\n\tlet rates: ModelCostRates = model.cost;\n\tlet matchedThreshold = -1;\n\tfor (const tier of model.cost.tiers ?? []) {\n\t\tif (inputTokens > tier.inputTokensAbove && tier.inputTokensAbove > matchedThreshold) {\n\t\t\trates = tier;\n\t\t\tmatchedThreshold = tier.inputTokensAbove;\n\t\t}\n\t}\n\n\t// Anthropic charges 2x base input for 1h cache writes.\n\tconst longWrite = usage.cacheWrite1h ?? 0;\n\tconst shortWrite = usage.cacheWrite - longWrite;\n\tusage.cost.input = (rates.input / 1000000) * usage.input;\n\tusage.cost.output = (rates.output / 1000000) * usage.output;\n\tusage.cost.cacheRead = (rates.cacheRead / 1000000) * usage.cacheRead;\n\tusage.cost.cacheWrite = (rates.cacheWrite * shortWrite + rates.input * 2 * longWrite) / 1000000;\n\tusage.cost.total = usage.cost.input + usage.cost.output + usage.cost.cacheRead + usage.cost.cacheWrite;\n\treturn usage.cost;\n}\n\nconst EXTENDED_THINKING_LEVELS: ModelThinkingLevel[] = [\"off\", \"minimal\", \"low\", \"medium\", \"high\", \"xhigh\", \"max\"];\n\nexport function getSupportedThinkingLevels<TApi extends Api>(model: Model<TApi>): ModelThinkingLevel[] {\n\tif (!model.reasoning) return [\"off\"];\n\n\treturn EXTENDED_THINKING_LEVELS.filter((level) => {\n\t\tconst mapped = model.thinkingLevelMap?.[level];\n\t\tif (mapped === null) return false;\n\t\tif (level === \"xhigh\" || level === \"max\") return mapped !== undefined;\n\t\treturn true;\n\t});\n}\n\nexport function clampThinkingLevel<TApi extends Api>(\n\tmodel: Model<TApi>,\n\tlevel: ModelThinkingLevel,\n): ModelThinkingLevel {\n\tconst availableLevels = getSupportedThinkingLevels(model);\n\tif (availableLevels.includes(level)) return level;\n\n\tconst requestedIndex = EXTENDED_THINKING_LEVELS.indexOf(level);\n\tif (requestedIndex === -1) return availableLevels[0] ?? \"off\";\n\n\tfor (let i = requestedIndex; i < EXTENDED_THINKING_LEVELS.length; i++) {\n\t\tconst candidate = EXTENDED_THINKING_LEVELS[i];\n\t\tif (availableLevels.includes(candidate)) return candidate;\n\t}\n\tfor (let i = requestedIndex - 1; i >= 0; i--) {\n\t\tconst candidate = EXTENDED_THINKING_LEVELS[i];\n\t\tif (availableLevels.includes(candidate)) return candidate;\n\t}\n\treturn availableLevels[0] ?? \"off\";\n}\n\n/**\n * Check if two models are equal by comparing both their id and provider.\n * Returns false if either model is null or undefined.\n */\nexport function modelsAreEqual<TApi extends Api>(\n\ta: Model<TApi> | null | undefined,\n\tb: Model<TApi> | null | undefined,\n): boolean {\n\tif (!a || !b) return false;\n\treturn a.id === b.id && a.provider === b.provider;\n}\n"]}