本地二进制文件包装器

次要是为了解决，不同环境下须要应用不同的本地二进制文件。

为什么不依据以后环境在线下载呢？

因为网络下载会有墙和编译的等不可抗力问题。所以自行下载好放起来, 再通过包装器应用.

const path = require('path');
const fs = require('fs-extra');

class Local_Bin_Wrapper {constructor(){this.map = new Map();
  }
  /**
   * 配置包门路
   * @param url 本地二进制包的绝对路径
   * @param platfrom 包的平台 darwin -> macOs win32-> windows
   * @returns this
   */
  src(url: string, platfrom: "darwin" | "win32"): this {this.map.set(platfrom, path.resolve(url));
    return this;
  }
  // 返回合乎以后平台的二进制地址
  path(): string {return this.map.get(process.platform);
  }
  
  // 仅仅提供一个调用办法
  async run(cmd = ["--version"]): Promise<execa.ExecaChildProcess<string>> {const path = this.path();
    try {
      // 验证是否存在
      // 如果不存在就会报错 try catch 捕捉
      fs.statSync(path);

      const result_1 = await execa(path, cmd);
      console.log("command:", result_1.command);
      if (result_1.stderr.length > 0) {console.log(result_1.stderr);
      }
      if (result_1.stdout.length > 0) {console.log(result_1.stdout);
      }
      return result_1;
    } catch (e) {console.log(`Failed to access file ${path}`, e);
      return Promise.reject(e);
    }
  }
}

调用例子

import * as execa from "execa";

const url = path.resolve(__dirname,'../bin');
const bin = new Local_Bin_Wrapper()
    .src(`${url}/mac/pngquant/pngquant`, 'darwin')
    .src(`${url}/win/pngquant/pngquant.exe`, 'win32');

// 这样便于本人封装
const pngquantBin = bin.path();
execa(pngquantBin, ['--version']);