@langchain/core - npm Package Compare versions

Comparing version 0.2.22 to 0.2.23

dist/runnables/base.d.ts

@@ -70,3 +70,3 @@ import { z } from "zod";
         fallbacks: Runnable<RunInput, RunOutput>[];
-    }): RunnableWithFallbacks<RunInput, RunOutput>;
+    } | Runnable<RunInput, RunOutput>[]): RunnableWithFallbacks<RunInput, RunOutput>;
     protected _getOptionsList<O extends CallOptions & {
@@ -572,2 +572,18 @@ runType?: string;
  * A Runnable that can fallback to other Runnables if it fails.
+ * External APIs (e.g., APIs for a language model) may at times experience
+ * degraded performance or even downtime.
+ *
+ * In these cases, it can be useful to have a fallback Runnable that can be
+ * used in place of the original Runnable (e.g., fallback to another LLM provider).
+ *
+ * Fallbacks can be defined at the level of a single Runnable, or at the level
+ * of a chain of Runnables. Fallbacks are tried in order until one succeeds or
+ * all fail.
+ *
+ * While you can instantiate a `RunnableWithFallbacks` directly, it is usually
+ * more convenient to use the `withFallbacks` method on an existing Runnable.
+ *
+ * When streaming, fallbacks will only be called on failures during the initial
+ * stream creation. Errors that occur after a stream starts will not fallback
+ * to the next Runnable.
  */
@@ -586,2 +602,3 @@ export declare class RunnableWithFallbacks<RunInput, RunOutput> extends Runnable<RunInput, RunOutput> {
     invoke(input: RunInput, options?: Partial<RunnableConfig>): Promise<RunOutput>;
+    _streamIterator(input: RunInput, options?: Partial<RunnableConfig> | undefined): AsyncGenerator<RunOutput>;
     batch(inputs: RunInput[], options?: Partial<RunnableConfig> | Partial<RunnableConfig>[], batchOptions?: RunnableBatchOptions & {
@@ -588,0 +605,0 @@ returnExceptions?: false;

package.json

 {
   "name": "@langchain/core",
-  "version": "0.2.22",
+  "version": "0.2.23",
   "description": "Core LangChain.js abstractions and schemas",
@@ -5,0 +5,0 @@ "type": "module",

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Improved metrics

Total package byte prevSize

2151305

increased by0.29%

Lines of code

53692

increased by0.26%

No dependency changes