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print a babel AST with specific nodes highlighted, for debugging codemods





CircleCI Coverage Status semantic-release Commitizen friendly npm version

print a babel AST with specific nodes highlighted, for debugging codemods



import printHighlightedAst from 'print-highlighted-ast'
import { parse } from '@babel/parser'
import traverse, { NodePath } from '@babel/traverse'
import chalk from 'chalk'

const code = `
const foo = () => 2
const bar = 500 + 600
const ast = parse(code)
const highlights: Array<[NodePath<any>, (code: string) => string]> = []
traverse(ast, {
  NumericLiteral: path => {
    highlights.push([path, chalk.bgBlue])

console.log(printHighlightedAst(code, { highlights })



You can pass the source code or a parsed AST as the first argument. If you pass an AST it will be converted to code with @babel/generator.

Each element of highlights is a tuple of [0] path you want to highlight, [1] highlighting function. You can pass options to @babel/parser and @babel/generator as shown below.

The code will be parsed with @babel/parser to determine the source range of the paths you want to highlight. If you're using language extensions like Flow, Typescript, or JSX, you'll need to pass those plugins in parseOptions.

import { Node } from '@babel/types'
import { NodePath } from '@babel/traverse'
import generate from '@babel/generator'
import { parse } from '@babel/parser'

function printHighlightedAst(
  codeOrAst: string | Node,
  }: {
    highlights: Iterable<[NodePath<any>, (code: string) => string]>
    generateOptions?: Parameters<typeof generate>[1]
    parseOptions?: Parameters<typeof parse>[1]
): string