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Node.js

Rule Description Snippet ESLint Default Link
callback-return Enforce `return` after a callback 
// Good
function foo() {
    if (err) {
        return callback(err);
    }
    callback();
}
Off [Link](http://eslint.org/docs/rules/callback-return)
handle-callback-err Enforce error handling in callbacks 
function loadData (err, data) {
    doSomething(); // forgot to handle error
}
Off [Link](http://eslint.org/docs/rules/handle-callback-err)
no-mixed-requires Disallow mixing regular variable and require declarations 
var fs = require('fs'),        // "core" 
    async = require('async'),  // "module" 
    baz = 42,                  // "other"
    bam;                       // "uninitialized"
Off [Link](http://eslint.org/docs/rules/no-mixed-requires)
no-new-require Disallow use of `new` operator with the `require` function 
// Bad
var appHeader = new require('app-header');
// Good
var AppHeader = require('app-header');
Off [Link](http://eslint.org/docs/rules/no-new-require)
no-path-concat Disallow string concatenation with `__dirname` and `__filename` 
// Bad
var fullPath = __dirname + "/foo.js";
// Good
var fullPath = path.join(__dirname, "foo.js");
Off [Link](http://eslint.org/docs/rules/no-path-concat)
no-process-exit Disallow `process.exit()` 
// Bad
if (somethingBadHappened) {
    console.error("Something bad happened!");
    process.exit(1);
}
// Good
if (somethingBadHappened) {
    throw new Error("Something bad happened!");
}
Off [Link](http://eslint.org/docs/rules/no-process-exit)
no-restricted-modules Restrict usage of specified node modules 
// With "fs" restricted
var fs = require('fs'); // Disallowed
Off [Link](http://eslint.org/docs/rules/no-restricted-modules)
no-sync Disallow use of synchronous methods 
fs.existsSync(somePath);
var contents = fs.readFileSync(somePath).toString();
Off [Link](http://eslint.org/docs/rules/no-sync)