/**
 * Spawn an error replacing %s in format string with other arguments.
 *
 * @hidden
 */
export declare function spawnUnexpectedError(errorMessageFormat: string, ...errorMessageArgs: ReadonlyArray<unknown>): Error;
export interface UserError<T extends {
    type: string;
}> extends Error {
    __userInfo: T;
}
/**
 * Spawn an error with an object with error info to render to the user.
 *
 * @hidden
 */
export declare function spawnUserError<T extends {
    type: string;
}>(errorInfo: T): UserError<T>;
/**
 * An alternative to facebook's invariant that's safe to use with base data
 *
 * If the first argument after the format string may be used to look up a way to
 * format the arguments into a more human digestible message that can include
 * links, styling, or emojis. See {@link verbose_message.ts} and
 * {@link airtable_api.ts} for examples.
 *
 * @hidden
 */
export declare function invariant(condition: unknown, errorMessageFormat: string, ...errorMessageArgs: Array<unknown>): asserts condition;
/**
 * @internal
 */
export declare function spawnUnknownSwitchCaseError(valueDescription: string, providedValue: never, key: string): Error;
/**
 * @internal
 */
export declare function spawnAbstractMethodError(): Error;