ast

A grammar describes the syntax of a programming language, and might be defined in Backus-Naur form (BNF). A lexer performs lexical analysis, turning text into tokens. A parser takes tokens and builds a data structure like an abstract syntax tree (AST). The parser is concerned with context: does the sequence of tokens fit the grammar? A compiler is a combined lexer and parser, built for a specific grammar.

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See REPL: https://runkit.com/alexandre-cai/60a2ae9feaab4400130133c8

transform(`
  type Test = 1 | -1;
`, {
  parserOpts: {
    plugins: ["typescript"],
  },
  plugins: [
    ({ types: t }) => ({
      visitor: {
        TSLit

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