Prettier Parsing Error While Typing

[MattMorgis]

I wanted to preface this by saying I am unsure if the bug is happening here in this package or in Microsoft/vscode-tslint. I filed issue #405 there as well.

Steps to Reproduce

1. Download this sample project that I put together to reproduce the issue.
2. Run npm install
3. Open src/index.ts and start typing anything.
4. Result: See error printed to tslint output, ⚠️ the bottom status bar next to TSLint. It then never recovers and the ⚠️ stays there forever

Console Output

[Warn  - 2:54:44 PM] The 'prettier' rule threw an error in '/tslint-prettier-vscode-bug/src/index.ts':
SyntaxError: Expression expected. (3:28)
  1 | console.log('👍');
  2 | 
> 3 | const x = "does this work"?
    |                            ^
  4 | 
    at e (/tslint-prettier-vscode-bug/node_modules/prettier/parser-typescript.js:1:422)
    at Object.parse (/tslint-prettier-vscode-bug/node_modules/prettier/parser-typescript.js:1:2010094)
    at Object.parse$2 [as parse] /tslint-prettier-vscode-bug/node_modules/prettier/index.js:7138:19)
    at coreFormat (/Users/morgism/Developer/nodejs/tslint-prettier-vscode-bug/node_modules/prettier/index.js:10398:23)
    at format (/tslint-prettier-vscode-bug/node_modules/prettier/index.js:10570:16)
    at formatWithCursor (/tslint-prettier-vscode-bug/node_modules/prettier/index.js:10582:12)
    at /Users/morgism/Developer/nodejs/tslint-prettier-vscode-bug/node_modules/prettier/index.js:34924:15
    at Object.format (/tslint-prettier-vscode-bug/node_modules/prettier/index.js:34943:12)
    at Walker.walk /tslint-prettier-vscode-bug/node_modules/tslint-plugin-prettier/rules/prettierRule.js:54:34)
    at Rule.AbstractRule.applyWithWalker (/tslint-prettier-vscode-bug/node_modules/tslint/lib/language/rule/abstractRule.js:31:16)

Video

A .gif demoing this can be found here.