Espree, the default parser of ESLint, has option "ecmaVersion". However, it doesn't support enabling each syntactic feature individually.

This plugin lets us disable each syntactic feature individually. So we can enable arbitrary syntactic features with the combination of ecmaVersion and this plugin.

ESLint is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code.

Node.js is an event-based server-side JavaScript engine.