Allow parsing of the nullish-coalescing operator

Turn async functions into ES2015 generators

Compile regular expressions using named groups to ES5.

Compile ES2015 shorthand properties to ES5

Compile ES2015 destructuring to ES5

Compile ES2015 spread to ES5

Compile ES2015 unicode string and number literals to ES5

Explode async and generator functions into a state machine.

Transform optional chaining operators into a series of nil checks

Allow parsing of class static blocks

Compile ES2015 computed properties to ES5

Allow parsing of BigInt literals

Allow parsing of class properties

Allow parsing of the logical assignment operators

Compile ES2015 Unicode regex to ES5

Compile ES2015 object super to ES5

Compile ES2015 Unicode escapes to ES5

Ensure that reserved words are quoted in object property keys

Compile Unicode property escapes in Unicode regular expressions to ES5.

Compile ES2015 sticky regex to an ES5 RegExp constructor