https://github.com/drewml/lazy-babylon-to-estree

Lazily transform a Babylon AST into an ESTree AST
https://github.com/drewml/lazy-babylon-to-estree

babel babylon estree

Last synced: 4 days ago
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Lazily transform a Babylon AST into an ESTree AST

• Host: GitHub
• URL: https://github.com/drewml/lazy-babylon-to-estree
• Owner: DrewML
• Created: 2018-01-04T02:18:08.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2018-01-04T05:44:29.000Z (about 7 years ago)
• Last Synced: 2024-12-06T17:25:59.088Z (2 months ago)
• Topics: babel, babylon, estree
• Language: JavaScript
• Size: 43.9 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# lazy-babylon-to-estree

[![CircleCI](https://circleci.com/gh/DrewML/lazy-babylon-to-estree.svg?style=svg)](https://circleci.com/gh/DrewML/lazy-babylon-to-estree)

WIP: Lazily "convert" a Babylon AST to the ESTree equivalent. Currently only converts `Literal`s. For the time being, the goal of this project is only to support the bare minimum transformations needed by `webpack`.

## Changelog

See [`Releases`](https://github.com/DrewML/lazy-babylon-to-estree/releases)

## Features

* Conversions happen lazily when a property on the AST is accessed

* Original AST is not mutated (besides 1 non-enumerable, symbol-keyed prop on the `Program` node)

* Referential Equality between nodes is maintained (`===`)

* Transformations occur as other code traverses the tree (this module does not perform a separate traversal of the AST)

## Why?

This is an experiment I'm doing with `webpack` and `babel-loader` to try and prevent the double parsing of code, without having to create an entire transformed copy of the AST each time we go from `babel-loader` >> `webpack`. It's possible this will have no positive performance impact (or will even have a negative perf impact), but I'd never know if I didn't write the code 🕺.

## Missing Features/TODO

* `ObjectProperty` and `ObjectMethod` >> `Property`

* `ClassMethod` >> `MethodDefinition`