/// <reference types="node" />

declare module 're2' {
  interface RE2BufferExecArray {
    index: number;
    input: Buffer;
    0: Buffer;
    groups?: {
      [key: string]: Buffer;
    };
    indices?: RegExpIndicesArray;
  }

  interface RE2BufferMatchArray {
    index?: number;
    input?: Buffer;
    0: Buffer;
    groups?: {
      [key: string]: Buffer;
    };
  }

  interface RE2 extends RegExp {
    readonly internalSource: string;
    exec(str: string): RegExpExecArray | null;
    exec(str: Buffer): RE2BufferExecArray | null;

    match(str: string): RegExpMatchArray | null;
    match(str: Buffer): RE2BufferMatchArray | null;

    test(str: string | Buffer): boolean;

    replace<K extends String | Buffer>(
      str: K,
      replaceValue: string | Buffer
    ): K;
    replace<K extends String | Buffer>(
      str: K,
      replacer: (substring: string, ...args: any[]) => string | Buffer
    ): K;

    search(str: string | Buffer): number;

    split<K extends String | Buffer>(str: K, limit?: number): K[];
  }

  interface RE2SetOptions {
    anchor?: 'unanchored' | 'start' | 'both';
  }

  interface RE2Set {
    readonly size: number;
    readonly source: string;
    readonly sources: string[];
    readonly flags: string;
    readonly anchor: 'unanchored' | 'start' | 'both';

    match(str: string | Buffer): number[];
    test(str: string | Buffer): boolean;
    toString(): string;
  }

  interface RE2SetConstructor {
    new (
      patterns: Iterable<Buffer | RegExp | RE2 | string>,
      flagsOrOptions?: string | Buffer | RE2SetOptions,
      options?: RE2SetOptions
    ): RE2Set;
    (
      patterns: Iterable<Buffer | RegExp | RE2 | string>,
      flagsOrOptions?: string | Buffer | RE2SetOptions,
      options?: RE2SetOptions
    ): RE2Set;
    readonly prototype: RE2Set;
  }

  interface RE2Constructor extends RegExpConstructor {
    new (pattern: Buffer | RegExp | RE2 | string): RE2;
    new (pattern: Buffer | string, flags?: string | Buffer): RE2;
    (pattern: Buffer | RegExp | RE2 | string): RE2;
    (pattern: Buffer | string, flags?: string | Buffer): RE2;
    readonly prototype: RE2;

    unicodeWarningLevel: 'nothing' | 'warnOnce' | 'warn' | 'throw';
    getUtf8Length(value: string): number;
    getUtf16Length(value: Buffer): number;

    Set: RE2SetConstructor;
    RE2: RE2Constructor;
  }

  var RE2: RE2Constructor;
  export = RE2;
}