import type { z } from "zod";
/**
 * Assert that a value has the runtime shape of a `SettingsLoader`
 * (callable, with the `resolved` / `envFields` / `opts` metadata
 * attached). Used both eagerly inside `defineSettings` (before merging
 * parent schemas) and from {@link validateDefineSettingsOptions}.
 */
export declare function assertSettingsLoaderShape(parent: unknown, idx: number): void;
interface ValidatedOptionsInput {
    ownEnvSchema: z.ZodTypeAny;
    resolvedEnvSchema: z.ZodObject<z.ZodRawShape>;
    envKey: string;
    overrideEnvKey: string | undefined;
    envOverrides: Record<string, string>;
    resolvedPerEnv: Record<string, unknown>;
    extendsList: ReadonlyArray<unknown>;
}
/**
 * Run all definition-time validations. Throws {@link NodeSettingsError}
 * with a stable `code` on the first problem. Catching problems here —
 * instead of waiting for the first `loader(env)` call — gives clearer
 * stack traces and prevents misconfiguration from shipping to prod.
 */
export declare function validateDefineSettingsOptions(input: ValidatedOptionsInput): void;
export {};
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