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']);