spawn npm ENOENT

[dounai1306]

小伙伴配置了mock的watch后，我本地使用npm run mock:watch 出现如题的报错信息，google后发现是因为npm在不同运行平台下的执行名不一样。 server = spawn(process.platform === "win32" ? "npm.cmd" : "npm", ['run', 'mock']);

const chokidar = require('chokidar');
const { spawn } = require('child_process');
const path = require('path');
const log = console.log.bind(console);
const children = [];
let server;

function restart() {
  if (server) {
    server.kill();
  }
  server = spawn(process.platform === "win32" ? "npm.cmd" : "npm", ['run', 'mock']);
  children.push(server);
  server.on('exit', function() {
    log('JSON Server is closed');
    log('JSON Server is restarting');
  });
  server.on('error', function(err) {
    log('error: ' + err);
  });
  server.stdout.on('data', function(data) {
    log(data.toString());
  });
}

const watcher = chokidar.watch(path.resolve(__dirname, './'), {
  ignored: /watch.js/,
  recursive: true,
  persistent: true
});

watcher
  .on('add', path => {
    log(`File ${path} has been added`);
  })
  .on('change', path => {
    log(`File ${path} has been changed`);
    restart();
  })
  .on('unlink', path => {
    log(`File ${path} has been removed`);
    restart();
  });

process.on('exit', function() {
  log('process is exited');
  children.forEach(function(child) {
    child.kill();
  });
});

restart();

[dounai1306]

上面这段代码其实执行得是一个文件监听，对于文件的新增、修改、删除做实时监听然后进行重启服务，在前段开发过程中需要对mock的一些数据做实时调整的时候，这段代码就会减少我们人肉关闭服务重启服务的操作了。

核心是依赖chokidar这个库对文件进行一个监听，虽然node自身也有相关的方法来实现文件监听，但是不能进行一个递归监控。