import type { Envelope, EnvelopeKind } from "./types.js";
/** Type guard: is `value` one of the known {@link EnvelopeKind}s? */
export declare function isEnvelopeKind(value: unknown): value is EnvelopeKind;
/**
 * Structural validation of an inbound `postMessage` payload.
 *
 * Returns `true` only for objects that carry our exact `channel`, a numeric
 * `protocol_version`, a known `kind`, a string `component_id`, and — where present
 * — string-typed `type` / `id` / `error`. Anything else (foreign traffic, spoofed
 * or malformed frames) fails the guard and is ignored by the caller.
 */
export declare function isEnvelope(value: unknown): value is Envelope;
/**
 * Parse an arbitrary `postMessage` payload into an {@link Envelope}, or `null` if
 * it is not a valid frame for our channel.
 */
export declare function parseEnvelope(value: unknown): Envelope | null;
/** Fields the caller supplies when building an outbound envelope. */
export type OutboundEnvelope = Partial<Omit<Envelope, "channel">> & Pick<Envelope, "kind">;
/**
 * Build a fully-formed {@link Envelope}, filling in the constant `channel` and the
 * supplied protocol version / component id defaults. Only defined optional fields
 * are included so frames stay minimal and JSON-clean.
 */
export declare function buildEnvelope(fields: OutboundEnvelope, defaults: {
    protocolVersion: number;
    componentId: string;
}): Envelope;
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