@langchain/langgraph/dist/graph/zod/zod-registry.js

LangGraph

import { getInteropZodDefaultGetter } from "@langchain/core/utils/types";
import { $ZodRegistry } from "zod/v4/core";
import { schemaMetaRegistry, } from "./meta.js";
/**
 * A Zod v4-compatible meta registry that extends the base registry.
 *
 * This registry allows you to associate and retrieve metadata for Zod schemas,
 * leveraging the base registry for storage. It is compatible with Zod v4 and
 * interoperates with the base registry to ensure consistent metadata management
 * across different Zod versions.
 *
 * @template Meta - The type of metadata associated with each schema.
 * @template Schema - The Zod schema type.
 */
export class LanggraphZodMetaRegistry extends $ZodRegistry {
    /**
     * Creates a new LanggraphZodMetaRegistry instance.
     *
     * @param parent - The base SchemaMetaRegistry to use for metadata storage.
     */
    constructor(parent) {
        super();
        Object.defineProperty(this, "parent", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: parent
        });
        // Use the parent's map for metadata storage
        this._map = this.parent._map;
    }
    add(schema, ..._meta) {
        const firstMeta = _meta[0];
        if (firstMeta && !firstMeta?.default) {
            const defaultValueGetter = getInteropZodDefaultGetter(schema);
            if (defaultValueGetter != null) {
                // eslint-disable-next-line no-param-reassign
                firstMeta.default = defaultValueGetter;
            }
        }
        return super.add(schema, ..._meta);
    }
}
export const registry = new LanggraphZodMetaRegistry(schemaMetaRegistry);
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