import type { ConfigSource, ConfigLoadResult, ResolveConfigOptions } from '../types.js';
/**
 * Configuration source that reads SFCC_* environment variables.
 *
 * Priority -10 (higher than dw.json at 0), matching CLI behavior where
 * env vars override file-based config.
 *
 * Not added to default sources — opt-in only. The CLI handles env vars
 * via oclif flag `env:` mappings; this source is for consumers like
 * the VS Code extension that call `resolveConfig()` directly.
 *
 * @example
 * ```typescript
 * import { resolveConfig, EnvSource } from '@salesforce/b2c-tooling-sdk/config';
 *
 * const config = resolveConfig({}, {
 *   sourcesBefore: [new EnvSource()],
 * });
 * ```
 *
 * @internal
 */
export declare class EnvSource implements ConfigSource {
    readonly name = "EnvSource";
    readonly priority = -10;
    private readonly env;
    /**
     * @param env - Environment object to read from. Defaults to `process.env`.
     */
    constructor(env?: Record<string, string | undefined>);
    load(_options: ResolveConfigOptions): ConfigLoadResult | undefined;
}