/**
 * Validate an `environment.env` variable name. Returns a reason fragment when
 * invalid (for the caller to prefix with its own path), or `null` when valid.
 * A `=`, whitespace, or control character yields a name the OS/`spawn` would
 * mangle, drop, or (if it reaches a diagnostic) inject terminal escapes.
 */
export declare function validateEnvVarName(name: string): string | null;
export declare function validateEnvVarValue(value: string): string | null;
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