import type { FieldDescriptor } from '@ecsia/schema';
export interface TopicFieldCodec {
    readonly name: string;
    /** Words this field occupies in a row. */
    readonly words: number;
    /** Word offset of this field within the row's payload section. */
    readonly offset: number;
    readonly encode: (value: unknown, out: {
        [i: number]: number;
    }, at: number) => void;
    readonly decode: (words: ArrayLike<number>, at: number) => unknown;
}
export interface TopicCodec {
    /** Total payload words per event row (sum of field words; 0 for a payload-less topic). */
    readonly fieldWords: number;
    readonly fields: readonly TopicFieldCodec[];
    /** Encode an init object into `out[at..at+fieldWords)`; missing fields take schema defaults. */
    encode(init: Record<string, unknown> | undefined, out: {
        [i: number]: number;
    }, at: number): void;
}
export declare function buildTopicCodec(fields: readonly FieldDescriptor[]): TopicCodec;
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