/*!
 * Shape-detection guards and loose-shape normalizers for VC / DID / wallet
 * objects.
 *
 * The Universal Wallet data model has no discriminant field distinguishing its
 * content types, and incoming request payloads may be a bare Verifiable
 * Credential, a Verifiable Presentation, or unrelated JSON. These guards
 * identify each by object shape.
 *
 * Two distinct "is this a VC" checks live here on purpose:
 *
 *  - `isVerifiableCredential` / `isVerifiablePresentation` inspect the `type`
 *    field. VC-vs-VP routing REQUIRES this: a VP carries the same
 *    `credentials/v(1|2)` context as the VCs it wraps, so a context check cannot
 *    tell them apart.
 *  - `isCredential` inspects `@context`. It runs only over already-decrypted
 *    wallet contents (a mix of VC / DID document / key / profile metadata),
 *    where the context cleanly separates a VC from the non-credential entries.
 *
 * The `typeArray` / `issuerId` / `subjectId` normalizers read the loosely-typed
 * `type`, `issuer`, and `credentialSubject.id` fields, each of which the VC data
 * model allows in more than one form.
 */
import type { IVerifiableCredential, IVerifiablePresentation } from './VCDM.js';
import type { IDidDocument } from './DID.js';
import type { IKeyPair } from './KeyPair.js';
/**
 * Whether an object is a Verifiable Credential, by inspecting its `type` for
 * `'VerifiableCredential'`.
 */
export declare function isVerifiableCredential(obj: unknown): obj is IVerifiableCredential;
/**
 * Whether an object is a Verifiable Presentation, by inspecting its `type` for
 * `'VerifiablePresentation'`.
 */
export declare function isVerifiablePresentation(obj: unknown): obj is IVerifiablePresentation;
/**
 * Whether a decrypted wallet content item is a Verifiable Credential, by
 * inspecting its `@context` for a VC Data Model v1 or v2 context URL.
 */
export declare function isCredential(item: unknown): item is IVerifiableCredential;
/**
 * Whether a decrypted wallet content item is a DID Document, by inspecting its
 * `@context` for the DID v1 context URL.
 */
export declare function isDidDocument(item: unknown): item is IDidDocument;
/**
 * Whether a decrypted wallet content item is an Ed25519 verification key.
 */
export declare function isVerificationKey(item: unknown): item is IKeyPair;
/**
 * Normalizes a `type` value (string or array) to an array of strings.
 *
 * @param type {unknown}
 * @returns {string[]}
 */
export declare function typeArray(type: unknown): string[];
/**
 * Extracts a DID / id string from an issuer value that may be a string or an
 * `{ id }` object.
 *
 * @param issuer {unknown}
 * @returns {string | undefined}
 */
export declare function issuerId(issuer: unknown): string | undefined;
/**
 * The credentialSubject id of a VC, when present.
 *
 * @param credential {IVerifiableCredential}
 * @returns {string | undefined}
 */
export declare function subjectId(credential: IVerifiableCredential): string | undefined;
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