How to use the @zkochan/cmd-shim.ifExists function in @zkochan/cmd-shim

const binDest = `${this.dest}/.bin`;

          // Using any sort of absolute path here would prevent makePortableProxyScript from preserving symlinks when
          // calling the binary
          const src = path.resolve(this.dest, pkg.bin[binName]);

          if (await fs.exists(src)) {
            // We ensure that the target is executable
            await fs.chmod(src, 0o755);
          }

          await fs.mkdirp(binDest);
          if (process.platform === 'win32') {
            const unlockMutex = await lockMutex(src);
            try {
              await cmdShim.ifExists(src, `${binDest}/${binName}`, {createPwshFile: false});
            } finally {
              unlockMutex();
            }
          } else {
            await fs.symlink(src, `${binDest}/${binName}`);
          }
        }
      }

      await fs.writeFile(
        path.join(this.dest, constants.METADATA_FILENAME),
        JSON.stringify(
          {
            manifest: pkg,
            artifacts: [],
            remote: this.remote,