/**
 * @license
 * Copyright 2022 Alex Layton
 *
 * Use of this source code is governed by an MIT-style
 * license that can be found in the LICENSE file or at
 * https://opensource.org/licenses/MIT.
 */
import type { Except } from 'type-fest';
/**
 * Symbol to access OADA `_id` key
 */
export declare const _id: unique symbol;
/**
 * Symbol to access OADA `_rev` key
 */
export declare const _rev: unique symbol;
/**
 * Symbol to access OADA `_type` key
 */
export declare const _type: unique symbol;
/**
 * Symbol to access OADA `_meta` key
 */
export declare const _meta: unique symbol;
/**
 * @todo just declare symbols in here if TS stops being dumb about symbol keys
 */
declare const Symbols: {
    readonly _id: typeof _id;
    readonly _rev: typeof _rev;
    readonly _type: typeof _type;
    readonly _meta: typeof _meta;
};
export declare type JsonObject = {
    [Key in string]?: JsonValue;
};
export declare type JsonArray = JsonValue[] | readonly JsonValue[];
export declare type JsonValue = string | number | boolean | null | JsonObject | JsonArray;
export declare type OADAified<T> = T extends JsonValue ? OADAifiedJsonValue<T> : T;
declare type OADAifyKey<T, K> = K extends keyof T ? T[K] : never;
/**
 * @todo Better name
 */
export declare type OADAifiedJsonObject<T extends JsonObject = JsonObject> = {
    [_id]: OADAifyKey<T, '_id'>;
    [_rev]: OADAifyKey<T, '_rev'>;
    [_type]: OADAifyKey<T, '_type'>;
    /**
     * @todo OADAify under _meta or not?
     */
    [_meta]: OADAified<T['_meta']>;
} & {
    [K in keyof Except<T, keyof typeof Symbols>]: OADAified<T[K]>;
};
/**
 * @todo Better name
 */
export declare type OADAifiedJsonArray<T extends JsonArray = JsonArray> = Array<OADAifiedJsonValue<T extends Array<infer R> ? R : T extends ReadonlyArray<infer R> ? R : never>>;
/**
 * @todo Better name
 */
export declare type OADAifiedJsonValue<T extends JsonValue = JsonValue> = T extends JsonArray ? OADAifiedJsonArray<T> : T extends JsonObject ? OADAifiedJsonObject<T> : T;
/**
 * @todo why doesn't TS figure this correctly with for ... in?
 */
export declare type StringKey<T extends JsonObject> = keyof T & string;
/**
 * Converts OADA keys (i.e., ones starting with `_`) to Symbols
 *
 * This way when looping etc. you only get actual data keys.
 * _Should_ turn itself back to original JSON for stringify, ajv, etc.
 */
export declare function oadaify<T extends JsonValue>(value: T, deep?: boolean): OADAified<T>;
/**
 * Inverse of oadaify
 *
 * Makes OADA keys normal object properties again.
 *
 * @see oadaify
 */
export declare function deoadaify<T extends JsonValue>(value: OADAified<T>): T;
export default oadaify;
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