/**
 * Extracts env-variable keys that a central config loader declares as object
 * keys while consuming the whole `process.env` object.
 *
 * This surfaces variables that are read indirectly — e.g. a Zod schema
 * `z.object({ CLIENT_SECRET_GITHUB: ... }).parse(process.env)` whose values are
 * later accessed as `appCfg.CLIENT_SECRET_GITHUB` — which the literal
 * `process.env.X` scanner never sees. The returned keys are used only to
 * suppress false "unused" findings; they do not count as usages for missing
 * detection, stats, or the health score.
 *
 * @param content - The full source of a file.
 * @returns UPPER_SNAKE_CASE keys declared in the file, or an empty array when the
 *   file does not consume the whole `process.env` object.
 */
export declare function detectConfigSchemaKeys(content: string): string[];
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