Allow parsing of optional catch bindings

Transforms new.target meta property

Allow parsing of the module assertion attributes in the import statement

Transform import() expressions

Turn JSX into React function calls

Remove nullish coalescing operator

Allow parsing of class static blocks

Compile optional catch bindings

Compile export namespace to ES2015

Ensure that reserved words are quoted in property accesses

Compile object rest and spread to ES5

Compile Unicode property escapes in Unicode regular expressions to ES5.

Turn async generator functions into ES2015 generators

Compile regular expressions using the `s` (`dotAll`) flag to ES5.

Compile inline regular expression modifiers

Allow parsing of '#foo in obj' brand checks

Externalise references to helpers and builtins, automatically polyfilling your code without polluting globals

This transformer wraps all typeof expressions with a method that replicates native behaviour. (ie. returning “symbol” for symbols)

Escape U+2028 LINE SEPARATOR and U+2029 PARAGRAPH SEPARATOR in JS strings

Compile regular expressions' unicodeSets (v) flag.