How to use the typechain.extractAbi function in typechain

transformAbiOrFullJsonFile(file: TFileDesc): TFileDesc[] | void {
    const name = getFilename(file.path);
    const abi = extractAbi(file.contents);

    if (abi.length === 0) {
      return;
    }

    const contract = parse(abi, name);
    const bytecode = extractBytecode(file.contents) || this.bytecodeCache[name];

    if (bytecode) {
      return [
        this.genContractTypingsFile(contract),
        this.genContractFactoryFile(contract, abi, bytecode),
      ];
    } else {
      this.contractCache[name] = { abi, contract };
      return [this.genContractTypingsFile(contract)];

transformFile(file: TFileDesc): TFileDesc | void {
    const abi = extractAbi(file.contents);
    const isEmptyAbi = abi.length === 0;
    if (isEmptyAbi) {
      return;
    }

    const name = getFilename(file.path);

    const contract = parse(abi, name);

    return {
      path: join(this.outDirAbs, `${name}.d.ts`),
      contents: codegen(contract),
    };
  }

transformFile(file: TFileDesc): TFileDesc | void {
    const abi = extractAbi(file.contents);
    const isEmptyAbi = abi.length === 0;
    if (isEmptyAbi) {
      return;
    }

    const name = getFilename(file.path);

    const contract = parse(abi, name);

    this.contracts.push(contract);
  }

transformFile(file: TFileDesc): TFileDesc | void {
    const abi = extractAbi(file.contents);
    const isEmptyAbi = abi.length === 0;
    if (isEmptyAbi) {
      return;
    }

    const name = getFilename(file.path);

    const contract = parse(abi, name);

    return {
      path: join(this.outDirAbs, `${name}.d.ts`),
      contents: codegen(contract),
    };
  }