import type { GrantPayload } from "./types.js";
/**
 * Type guard that checks whether an unknown value has the shape of a {@link GrantPayload}.
 *
 * Validates the presence and types of required fields: `grantId`, `userAddress`,
 * `builderAddress`, and `scopes` (non-empty string array).
 *
 * @example
 * ```typescript
 * const body = await request.json();
 * if (!isValidGrant(body.grant)) {
 *   return NextResponse.json({ error: "Invalid grant" }, { status: 400 });
 * }
 * // body.grant is now typed as GrantPayload
 * const data = await getData({ privateKey, grant: body.grant });
 * ```
 */
export declare function isValidGrant(value: unknown): value is GrantPayload;
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