export type ShellFrame = 'single' | 'double' | 'dollar-single' | 'dollar-double' | 'paren-sub' | 'arith' | 'backtick' | 'param-brace' | 'heredoc' | 'line-comment';
export type ShellUnsafeRegion = ShellFrame | 'escape';
interface ArithSquareFrame {
    readonly kind: 'arith-square';
    readonly bracketDepth: number;
}
interface ArithFrame {
    readonly kind: 'arith';
    readonly parenthesisDepth: number;
}
type ShellScanFrame = Exclude<ShellFrame, 'arith'> | ArithFrame | ArithSquareFrame;
export type ShellSiteContext = {
    readonly kind: 'unquoted' | 'single' | 'double';
} | {
    readonly kind: 'unsafe';
    readonly region: ShellUnsafeRegion;
};
export interface ShellScanState {
    readonly frames: readonly ShellScanFrame[];
    readonly pendingEscape?: boolean;
    readonly previousCharacter?: string;
    readonly previousCharacterEscaped?: boolean;
}
export declare const initialShellScanState: ShellScanState;
export declare function scanShellLiteral(text: string, state: ShellScanState): ShellScanState;
export declare function classifyShellSite(state: ShellScanState): ShellSiteContext;
export {};
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