babel/README.md

acorn-6to5

acorn-6to5 is not supported outside of 6to5 usage. Do not expect support if you use this in your own applications.

Deviates from acorn in the following ways:

• JSX support via acorn-jsx
• ES7 Abstract references
• ES7 Async/await
• ES7 Exponentiation operator
• ES7 Object rest/spread
• 6to5 Playground features