lazy-babylon-to-estree

lazy-babylon-to-estree

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

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