export type MermaidView = "flow" | "sequence";
export interface CheckResult {
    ok: boolean;
    error?: string;
}
export interface CommandResult {
    stdout: string;
    stderr: string;
    code: number;
    killed: boolean;
}
export type RunCommand = (command: string, args: string[], options?: {
    timeout?: number;
}) => Promise<CommandResult>;
/**
 * Cheap, dependency-free validation that catches the failure modes we care
 * about: wrong diagram type, unbalanced blocks, unbalanced quotes, reserved
 * node names, and absurdly large output. It cannot prove Mermaid correctness.
 */
export declare function structuralCheck(code: string, view: MermaidView): CheckResult;
export declare function findChrome(run: RunCommand): Promise<string | undefined>;
export declare function chromeMermaidCheck(code: string, chrome: string, vendorDir: string, run: RunCommand): Promise<CheckResult>;
export interface ValidateOptions {
    run?: RunCommand;
    vendorDir?: string;
    chrome?: string | null;
}
export interface ValidationOutcome {
    result: CheckResult;
    gate: "structural" | "chrome";
}
/**
 * Structural check always runs. When a Chrome binary and a vendored Mermaid
 * copy are available, the real Mermaid parser is used as a second gate.
 */
export declare function validateMermaid(code: string, view: MermaidView, options?: ValidateOptions): Promise<ValidationOutcome>;