nodejs自动热加载文件的做法

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14down vote

If somebody still comes to this question and wants to solve it using only the standard modules I made a simple example:

var process = require('process');
var cp = require('child_process');
var fs = require('fs');

var server = cp.fork('server.js');
console.log('Server started');

fs.watchFile('server.js', function (event, filename) {
    server.kill();
    console.log('Server stopped');
    server = cp.fork('server.js');
    console.log('Server started');
});

process.on('SIGINT', function () {
    server.kill();
    fs.unwatchFile('server.js');
    process.exit();
});

This example is only for one file (server.js), but can be adapted to multiple files using an array of files, a for loop to get all file names, or by watching a directory:

fs.watch('./', function (event, filename) { // sub directory changes are not seen
    console.log(`restart server`);
    server.kill();
    server = cp.fork('server.js');    
})

This code was made for Node.js 0.8 API, it is not adapted for some specific needs but will work in some simple apps