/**
 * Given the env vars already stored on the target environment and the env
 * vars the CLI is about to send, returns the keys whose stored value would be
 * overwritten with a different value. Keys that are new, or whose value is
 * unchanged, are not reported (they aren't destructive overwrites).
 */
export declare function getOverwrittenEnvKeys(existing: Record<string, string> | null | undefined, incoming: Record<string, string>): string[];
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