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Jamund Ferguson (@xjamundx) describes how to turn your JavaScript code into an AST (Abstract Syntax Tree) and then manipulate your code in its new form in a variety of exciting ways.
You can use AST’s to validate code using something like ESLint (eslint.org). You can also transpile much like popular frameworks such as Babel.js (babeljs.org).
See how AST’s can help you get a handle on your code.