@langchain/langgraph/dist/pregel/debug.cjs.map

LangGraph

{"version":3,"file":"debug.cjs","names":["EXCLUDED_METADATA_KEYS","filterToUserTags","INTERRUPT","findSubgraphPregel","readChannels"],"sources":["../../src/pregel/debug.ts"],"sourcesContent":["import { RunnableConfig } from \"@langchain/core/runnables\";\nimport {\n  CheckpointMetadata,\n  CheckpointPendingWrite,\n  EXCLUDED_METADATA_KEYS,\n  PendingWrite,\n} from \"@langchain/langgraph-checkpoint\";\nimport { BaseChannel } from \"../channels/base.js\";\nimport {\n  ERROR,\n  Interrupt,\n  INTERRUPT,\n  RETURN,\n  TAG_HIDDEN,\n} from \"../constants.js\";\nimport { EmptyChannelError } from \"../errors.js\";\nimport {\n  PregelExecutableTask,\n  PregelTaskDescription,\n  StateSnapshot,\n} from \"./types.js\";\nimport { readChannels } from \"./io.js\";\nimport { findSubgraphPregel } from \"./utils/subgraph.js\";\nimport { filterToUserTags } from \"./utils/config.js\";\n\ntype ConsoleColors = {\n  start: string;\n  end: string;\n};\n\ntype ConsoleColorMap = {\n  [key: string]: ConsoleColors;\n};\n\nconst COLORS_MAP: ConsoleColorMap = {\n  blue: {\n    start: \"\\x1b[34m\",\n    end: \"\\x1b[0m\",\n  },\n  green: {\n    start: \"\\x1b[32m\",\n    end: \"\\x1b[0m\",\n  },\n  yellow: {\n    start: \"\\x1b[33;1m\",\n    end: \"\\x1b[0m\",\n  },\n};\n\n/**\n * Wrap some text in a color for printing to the console.\n */\nexport const wrap = (color: ConsoleColors, text: string): string =>\n  `${color.start}${text}${color.end}`;\n\nexport function printCheckpoint<Value>(\n  step: number,\n  channels: Record<string, BaseChannel<Value>>\n) {\n  console.log(\n    [\n      `${wrap(COLORS_MAP.blue, \"[langgraph/checkpoint]\")}`,\n      `Finishing step ${step}. Channel values:\\n`,\n      `\\n${JSON.stringify(\n        Object.fromEntries(_readChannels<Value>(channels)),\n        null,\n        2\n      )}`,\n    ].join(\"\")\n  );\n}\n\nexport function* _readChannels<Value>(\n  channels: Record<string, BaseChannel<Value>>\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n): IterableIterator<[string, any]> {\n  for (const [name, channel] of Object.entries(channels)) {\n    try {\n      yield [name, channel.get()];\n      // eslint-disable-next-line @typescript-eslint/no-explicit-any\n    } catch (error: any) {\n      if (error.name === EmptyChannelError.unminifiable_name) {\n        // Skip the channel if it's empty\n        continue;\n      } else {\n        throw error; // Re-throw the error if it's not an EmptyChannelError\n      }\n    }\n  }\n}\n\n/**\n * Build the user-meaningful metadata to forward on a task's stream payload.\n *\n * Drops langgraph's internal framework keys ({@link EXCLUDED_METADATA_KEYS}) —\n * which are redundant with the task's own fields and namespace — while keeping\n * keys like `lc_agent_name`, `ls_integration`, and any user-supplied metadata.\n * Filtered config tags are folded in under `tags`, mirroring the messages\n * stream handler. Returns `undefined` when there is nothing to forward.\n */\nfunction buildTaskMetadata(\n  config: RunnableConfig | undefined\n): Record<string, unknown> | undefined {\n  if (config == null) return undefined;\n  const metadata: Record<string, unknown> = {};\n  if (config.metadata != null) {\n    for (const [key, value] of Object.entries(config.metadata)) {\n      if (!EXCLUDED_METADATA_KEYS.has(key)) metadata[key] = value;\n    }\n  }\n  const filteredTags = filterToUserTags(config.tags);\n  if (filteredTags != null) metadata.tags = filteredTags;\n  return Object.keys(metadata).length > 0 ? metadata : undefined;\n}\n\nexport function* mapDebugTasks<N extends PropertyKey, C extends PropertyKey>(\n  tasks: readonly PregelExecutableTask<N, C>[]\n) {\n  for (const { id, name, input, config, triggers, writes } of tasks) {\n    if (config?.tags?.includes(TAG_HIDDEN)) continue;\n\n    const interrupts = writes\n      .filter(([writeId, n]) => {\n        return writeId === id && n === INTERRUPT;\n      })\n      .map(([, v]) => {\n        return v;\n      });\n    const payload: {\n      id: string;\n      name: N;\n      input: unknown;\n      triggers: string[];\n      interrupts: unknown[];\n      metadata?: Record<string, unknown>;\n    } = { id, name, input, triggers, interrupts };\n    const metadata = buildTaskMetadata(config);\n    if (metadata != null) payload.metadata = metadata;\n    yield payload;\n  }\n}\n\nfunction isMultipleChannelWrite(\n  value: unknown\n): value is { $writes: unknown[] } {\n  if (typeof value !== \"object\" || value === null) return false;\n  return \"$writes\" in value && Array.isArray(value.$writes);\n}\n\nfunction mapTaskResultWrites(writes: PendingWrite<unknown>[]) {\n  const result: Record<string, unknown> = {};\n\n  for (const [channel, value] of writes) {\n    const strChannel = String(channel);\n\n    if (strChannel in result) {\n      const channelWrites = isMultipleChannelWrite(result[strChannel])\n        ? result[strChannel].$writes\n        : [result[strChannel]];\n\n      channelWrites.push(value);\n      result[strChannel] = { $writes: channelWrites };\n    } else {\n      result[strChannel] = value;\n    }\n  }\n  return result;\n}\n\nexport function* mapDebugTaskResults<\n  N extends PropertyKey,\n  C extends PropertyKey,\n>(\n  tasks: readonly [PregelExecutableTask<N, C>, PendingWrite<C>[]][],\n  streamChannels: PropertyKey | Array<PropertyKey>\n) {\n  for (const [{ id, name, config }, writes] of tasks) {\n    if (config?.tags?.includes(TAG_HIDDEN)) continue;\n    yield {\n      id,\n      name,\n      result: mapTaskResultWrites(\n        writes.filter(([channel]) => {\n          return Array.isArray(streamChannels)\n            ? streamChannels.includes(channel)\n            : channel === streamChannels;\n        })\n      ),\n      interrupts: writes.filter((w) => w[0] === INTERRUPT).map((w) => w[1]),\n    };\n  }\n}\n\ntype ChannelKey = string | number | symbol;\n\nexport function* mapDebugCheckpoint<\n  N extends PropertyKey,\n  C extends PropertyKey,\n>(\n  config: RunnableConfig,\n  channels: Record<string, BaseChannel>,\n  streamChannels: string | string[],\n  metadata: CheckpointMetadata,\n  tasks: readonly PregelExecutableTask<N, C>[],\n  pendingWrites: CheckpointPendingWrite[],\n  parentConfig: RunnableConfig | undefined,\n  outputKeys: ChannelKey | ChannelKey[]\n) {\n  function formatConfig(config: RunnableConfig) {\n    // https://stackoverflow.com/a/78298178\n    type CamelToSnake<\n      T extends string,\n      A extends string = \"\",\n    > = T extends `${infer F}${infer R}`\n      ? CamelToSnake<\n          R,\n          `${A}${F extends Lowercase<F> ? F : `_${Lowercase<F>}`}`\n        >\n      : A;\n\n    // make sure the config is consistent with Python\n    const pyConfig: Partial<\n      Record<CamelToSnake<keyof RunnableConfig>, unknown>\n    > = {};\n\n    if (config.callbacks != null) pyConfig.callbacks = config.callbacks;\n    if (config.configurable != null)\n      pyConfig.configurable = config.configurable;\n    if (config.maxConcurrency != null)\n      pyConfig.max_concurrency = config.maxConcurrency;\n\n    if (config.metadata != null) pyConfig.metadata = config.metadata;\n    if (config.recursionLimit != null)\n      pyConfig.recursion_limit = config.recursionLimit;\n    if (config.runId != null) pyConfig.run_id = config.runId;\n    if (config.runName != null) pyConfig.run_name = config.runName;\n    if (config.tags != null) pyConfig.tags = config.tags;\n\n    return pyConfig;\n  }\n\n  const parentNs = config.configurable?.checkpoint_ns;\n  const taskStates: Record<string, RunnableConfig | StateSnapshot> = {};\n\n  for (const task of tasks) {\n    const candidates = task.subgraphs?.length ? task.subgraphs : [task.proc];\n    if (!candidates.find(findSubgraphPregel)) continue;\n\n    let taskNs = `${task.name as string}:${task.id}`;\n    if (parentNs) taskNs = `${parentNs}|${taskNs}`;\n\n    taskStates[task.id] = {\n      configurable: {\n        thread_id: config.configurable?.thread_id,\n        checkpoint_ns: taskNs,\n      },\n    };\n  }\n\n  yield {\n    config: formatConfig(config),\n    values: readChannels(channels, streamChannels),\n    metadata,\n    next: tasks.map((task) => task.name),\n    tasks: tasksWithWrites(tasks, pendingWrites, taskStates, outputKeys),\n    parentConfig: parentConfig ? formatConfig(parentConfig) : undefined,\n  };\n}\n\nexport function tasksWithWrites<N extends PropertyKey, C extends PropertyKey>(\n  tasks: PregelTaskDescription[] | readonly PregelExecutableTask<N, C>[],\n  pendingWrites: CheckpointPendingWrite[],\n  states: Record<string, RunnableConfig | StateSnapshot> | undefined,\n  outputKeys: ChannelKey[] | ChannelKey\n): PregelTaskDescription[] {\n  return tasks.map((task): PregelTaskDescription => {\n    const error = pendingWrites.find(\n      ([id, n]) => id === task.id && n === ERROR\n    )?.[2];\n\n    const interrupts = pendingWrites\n      .filter(([id, n]) => id === task.id && n === INTERRUPT)\n      .map(([, , v]) => v) as Interrupt[];\n\n    const result = (() => {\n      if (error || interrupts.length || !pendingWrites.length) return undefined;\n\n      const idx = pendingWrites.findIndex(\n        ([tid, n]) => tid === task.id && n === RETURN\n      );\n\n      if (idx >= 0) return pendingWrites[idx][2];\n\n      if (typeof outputKeys === \"string\") {\n        return pendingWrites.find(\n          ([tid, n]) => tid === task.id && n === outputKeys\n        )?.[2];\n      }\n\n      if (Array.isArray(outputKeys)) {\n        const results = pendingWrites\n          .filter(([tid, n]) => tid === task.id && outputKeys.includes(n))\n          .map(([, n, v]) => [n, v] as PendingWrite<C>);\n\n        if (!results.length) return undefined;\n        return mapTaskResultWrites(results);\n      }\n\n      return undefined;\n    })();\n\n    if (error) {\n      return {\n        id: task.id,\n        name: task.name as string,\n        path: task.path,\n        error,\n        interrupts,\n        result,\n      };\n    }\n\n    const taskState = states?.[task.id];\n    return {\n      id: task.id,\n      name: task.name as string,\n      path: task.path,\n      interrupts,\n      ...(taskState !== undefined ? 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