import { type KnowledgeAssetWritableQuad } from '../knowledge-asset-write-contract.js';
/**
 * GH #306 / #787 — shape guard for the lifecycle write routes. The `graph`
 * term is OPTIONAL here: those routes legitimately accept `{subject,predicate,object}`
 * and fill the graph internally. Without this guard, a string-shaped quad
 * (e.g. an N-Quad line `"<s> <p> <o> ."`) slips past a bare `Array.isArray`
 * check and crashes the agent write path with a TypeError → HTTP 500 instead
 * of an actionable 4xx.
 */
export declare function isWritableQuad(value: unknown): value is KnowledgeAssetWritableQuad;
/**
 * GH #306 / #787 — the boundary check for quads a lifecycle write route stores
 * (create and wm/write): shape, then every term, parsed exactly as sent by
 * rdf-utils' `parseWritableRdfTerm`, against {@link WRITABLE_QUAD_TERMS}, and an
 * optional bare graph IRI, then literal size. A string-shaped quad, a bare
 * word, an unterminated literal or a malformed IRI such as `urn:a b`,
 * `…/na^me` or `…/%zz` would otherwise reach the store. The store either fails
 * the write (HTTP 500), or, for characters it strips, stores the triple under
 * a different IRI. A literal carrying a raw line break could even add
 * statements of its own. Returns the 400 body for the first failure, or null.
 */
export declare function validateWritableQuads(label: string, quads: unknown[]): Record<string, unknown> | null;
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