/**
 * Compile a user-supplied regex with conservative bounds against ReDoS.
 *
 * Duplicated from @wrongstack/tools/_regex.ts to avoid a circular
 * dependency (tools depends on core, not vice versa). Keep both copies
 * in sync if the heuristics change.
 *
 * V8's regex engine is backtracking-based and cannot interrupt a
 * synchronous match — a pattern like `(a+)+$` against a sufficiently
 * long line will pin a worker for seconds.
 */
export interface CompileResult {
    ok: true;
    regex: RegExp;
}
export interface CompileFail {
    ok: false;
    reason: string;
}
export declare function compileUserRegex(pattern: string, flags: string): CompileResult | CompileFail;
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