/**
 * SandboxGuard — Fail-Fast Syntax Checker for LLM-Provided Code
 *
 * Provides quick feedback BEFORE sending code to the isolated-vm engine.
 * This is NOT a security boundary — security comes from the empty V8
 * Context (no `process`, `require`, `fs`, or `globalThis` injected).
 *
 * Purpose:
 * - Validate that the code is syntactically valid JavaScript
 * - Check that it looks like a function expression / arrow function
 * - Provide fast, descriptive error messages to the LLM
 *
 * Properties:
 * - Zero runtime dependencies (pure string analysis)
 * - Fail-fast: rejects obviously broken code before V8 boot
 * - NOT a security gate (LLMs can obfuscate; the Isolate is the real wall)
 *
 * @module
 * @internal
 */
export interface GuardResult {
    /** Whether the code passed the fail-fast check */
    readonly ok: boolean;
    /** Human-readable reason for rejection (present when `ok` is false) */
    readonly violation?: string;
}
/**
 * Validate LLM-provided code before sending it to the sandbox.
 *
 * Performs two checks:
 * 1. **Shape check**: The code must look like a function expression
 * 2. **Suspicious pattern check**: Fail-fast for obviously unsandboxable patterns
 *
 * @param code - The JavaScript code string from the LLM
 * @returns A `GuardResult` indicating whether the code passed
 *
 * @example
 * ```typescript
 * const result = validateSandboxCode('(data) => data.filter(d => d.x > 5)');
 * // { ok: true }
 *
 * const bad = validateSandboxCode('require("fs").readFileSync("/etc/passwd")');
 * // { ok: false, violation: 'Code must be a function expression...' }
 * ```
 */
export declare function validateSandboxCode(code: string): GuardResult;
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