@langchain/langgraph
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{"version":3,"file":"validate.cjs","names":["INTERRUPT","PregelNode"],"sources":["../../src/pregel/validate.ts"],"sourcesContent":["import { All } from \"@langchain/langgraph-checkpoint\";\nimport { BaseChannel } from \"../channels/index.js\";\nimport { INTERRUPT } from \"../constants.js\";\nimport { PregelNode } from \"./read.js\";\n\nexport class GraphValidationError extends Error {\n constructor(message?: string) {\n super(message);\n this.name = \"GraphValidationError\";\n }\n}\n\nexport function validateGraph<\n Nn extends Record<string, PregelNode>,\n Cc extends Record<string, BaseChannel>,\n>({\n nodes,\n channels,\n inputChannels,\n outputChannels,\n streamChannels,\n interruptAfterNodes,\n interruptBeforeNodes,\n}: {\n nodes: Nn;\n channels: Cc;\n inputChannels: keyof Cc | Array<keyof Cc>;\n outputChannels: keyof Cc | Array<keyof Cc>;\n streamChannels?: keyof Cc | Array<keyof Cc>;\n interruptAfterNodes?: Array<keyof Nn> | All;\n interruptBeforeNodes?: Array<keyof Nn> | All;\n}): void {\n if (!channels) {\n throw new GraphValidationError(\"Channels not provided\");\n }\n\n const subscribedChannels = new Set<keyof Cc>();\n const allOutputChannels = new Set<keyof Cc>();\n\n for (const [name, node] of Object.entries(nodes)) {\n if (name === INTERRUPT) {\n throw new GraphValidationError(`\"Node name ${INTERRUPT} is reserved\"`);\n }\n if (node.constructor === PregelNode) {\n node.triggers.forEach((trigger) => subscribedChannels.add(trigger));\n } else {\n throw new GraphValidationError(\n `Invalid node type ${typeof node}, expected PregelNode`\n );\n }\n }\n\n // side effect: update channels\n for (const chan of subscribedChannels) {\n if (!(chan in channels)) {\n throw new GraphValidationError(\n `Subscribed channel '${String(chan)}' not in channels`\n );\n }\n }\n\n if (!Array.isArray(inputChannels)) {\n if (!subscribedChannels.has(inputChannels)) {\n throw new GraphValidationError(\n `Input channel ${String(\n inputChannels\n )} is not subscribed to by any node`\n );\n }\n } else {\n if (inputChannels.every((channel) => !subscribedChannels.has(channel))) {\n throw new GraphValidationError(\n `None of the input channels ${inputChannels} are subscribed to by any node`\n );\n }\n }\n\n if (!Array.isArray(outputChannels)) {\n allOutputChannels.add(outputChannels);\n } else {\n outputChannels.forEach((chan) => allOutputChannels.add(chan));\n }\n\n if (streamChannels && !Array.isArray(streamChannels)) {\n allOutputChannels.add(streamChannels);\n } else if (Array.isArray(streamChannels)) {\n streamChannels.forEach((chan) => allOutputChannels.add(chan));\n }\n\n for (const chan of allOutputChannels) {\n if (!(chan in channels)) {\n throw new GraphValidationError(\n `Output channel '${String(chan)}' not in channels`\n );\n }\n }\n\n // validate interrupt before/after\n if (interruptAfterNodes && interruptAfterNodes !== \"*\") {\n for (const node of interruptAfterNodes) {\n if (!(node in nodes)) {\n throw new GraphValidationError(`Node ${String(node)} not in nodes`);\n }\n }\n }\n\n if (interruptBeforeNodes && interruptBeforeNodes !== \"*\") {\n for (const node of interruptBeforeNodes) {\n if (!(node in nodes)) {\n throw new GraphValidationError(`Node ${String(node)} not in nodes`);\n }\n }\n }\n}\n\nexport function validateKeys<Cc extends Record<string, BaseChannel>>(\n keys: keyof Cc | Array<keyof Cc>,\n channels: Cc\n): void {\n if (Array.isArray(keys)) {\n for (const key of keys) {\n if (!(key in channels)) {\n throw new Error(`Key ${String(key)} not found in channels`);\n }\n }\n } else {\n if (!(keys in channels)) {\n throw new Error(`Key ${String(keys)} not found in channels`);\n }\n 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