Optional Chaining not supported

[illeatmyhat]

Bug report

What is the current behavior?
Using Optional Chaining in TypeScript results in an error expecting a loader.

If the current behavior is a bug, please provide the steps to reproduce.
Set tsconfig.json => "target": "es2020"

let foo = 0
console.log(foo?.toString())

Compilation results in the error:

Module parse failed: Unexpected token (5:16)
File was processed with these loaders:
 * ./node_modules/ts-loader/index.js
You may need an additional loader to handle the result of these loaders.
| let foo = 0;
> console.log(foo?.toString());

What is the expected behavior?
Since ES2020 and TypeScript support Optional Chaining, the operator should be ignored by the loader and compilation should pass.

Other relevant information:
Stack Overflow indicates the issue lies with the webpack dependency Acorn, which implemented support for Optional Chaining in their 7.3.0 release from 3 days ago.

webpack version: 4.43
Node.js version: 14.3.0
ts-loader version: 7.0.5
Operating System: OS X Catalina 10.15.4 (19E287)
Additional tools:

[illeatmyhat]

dupe of #10227