Not transpiling nullish coalesce with typescript

[judocode]

We are attempting to use ncc to transpile some typescript code into a single js file, and some of the dependencies include code that includes a nullish coalesce operator and it seems to simply ignore them and outputs it in the outputted js file which gives the following error when you attempt and run via node dist/index.js:

const d = options.lastModified ?? Date.now()
                                    ^

SyntaxError: Unexpected token '?'

I have the target defined both in the command: ncc build -a -e typescript --target es2015 src/main.ts

and in the tsconfig file:

{
  "compilerOptions": {
    "target": "es2015",
    "module": "commonjs",
    "moduleResolution": "node"
  }
}

Node version: 14

[styfle]

This looks like a duplicate of #873