Support for the experimental syntax 'optionalChaining'

[LoicMahieu]

Current Behavior

Could not use optional chaining with tsdx@0.11.0 and typescript@3.7.3:

(babel plugin) SyntaxError: /some-path/Foo.ts: Support for the experimental syntax 'optionalChaining' isn't currently enabled (1:19):
> 1 | console.log(foo.bar?.foo)

Desired Behavior

Optional chaining is enabled

Suggested Solution

• Issue has been solved in https://github.com/facebook/create-react-app/pull/7438/files with 2 new babel plugins:

// Adds syntax support for optional chaining (.?)
{ name: '@babel/plugin-proposal-optional-chaining' },
// Adds syntax support for default value using ?? operator
{ name: '@babel/plugin-proposal-nullish-coalescing-operator' },