import type { FieldType } from "@antelopejs/interface-database/schema";
export type DecodeLeft = {
    _tag: "Left";
    left: Array<{
        value: unknown;
        context: unknown[];
        message?: string;
    }>;
};
export type DecodeRight<T> = {
    _tag: "Right";
    right: T;
};
export type DecodeResult<T> = DecodeLeft | DecodeRight<T>;
export type TestCodec<T> = {
    readonly _A: T;
    readonly _O: T;
    readonly _I: unknown;
    readonly name: string;
    is(u: unknown): u is T;
    encode(a: T): unknown;
    decode(u: unknown): DecodeResult<T>;
};
export declare function makeCodec<T>(name: string, guard: (u: unknown) => u is T): TestCodec<T>;
export declare const stringCodec: TestCodec<string>;
export declare const numberCodec: TestCodec<number>;
export declare function asFieldType(codec: TestCodec<unknown>): FieldType;