Allow parsing of class properties

Compile ES2015 shorthand properties to ES5

Compile ES2015 for...of to ES5

Compile ES2015 spread to ES5

Explode async and generator functions into a state machine.

Compile ES2015 Unicode regex to ES5

Compile exponentiation operator to ES5

Allow parsing of the logical assignment operators

Allow parsing of import.meta

Transform optional chaining operators into a series of nil checks

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

Remove nullish coalescing operator

Compile ES2015 template literals to ES5

Ensure that reserved words are quoted in object property keys

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

Allow parsing of the nullish-coalescing operator

Allow parsing of BigInt literals

Allow parsing of object rest/spread

Compile ES2015 unicode string and number literals to ES5

Compile regular expressions using named groups to ES5.