/**
 * Validates that a CLI argument does not contain shell metacharacters that
 * could be interpreted by the shell when passed via `spawn(..., { shell: true })`.
 *
 * @throws Error if `arg` contains any unsafe shell character.
 */
export declare function assertSafeCliArg(arg: string): void;
/**
 * Validates every element of an args array. See {@link assertSafeCliArg}.
 */
export declare function assertSafeCliArgs(args: ReadonlyArray<string>): void;
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