[Bug]: Unexpected reserved word when variable contains ascii

[alan-agius4]

💻

• Would you like to work on a fix?

How are you using Babel?

babel-loader (webpack)

Input code

let \u0275ResourceLoaderImpl_BaseFactory

https://babeljs.io/repl#?browsers=ie%209&build=&builtIns=false&corejs=3.6&spec=false&loose=false&code_lz=DYUwLgBAOgrgDAJgOwFYBKIDOB7GAnAYxABlsBDAExDwEkBbAB2AH0AhMzEAMTILGzwBPIA&debug=false&forceAllTransforms=false&shippedProposals=false&circleciRepo=&evaluate=false&fileSize=false&timeTravel=false&sourceType=unambiguous&lineWrap=false&presets=env&prettier=false&targets=&version=7.14.2&externalPlugins=

Configuration file name

No response

Configuration

Can be reproduced with any config included in the repl.

Current and expected behavior

Unexpected reserved word 'let'. (1:0)

1 | let \u0275ResourceLoaderImpl_BaseFactory
| ^

Environment

System:
OS: macOS 11.2.3
Binaries:
Node: 12.20.2 - ~/.nvm/versions/node/v12.20.2/bin/node
Yarn: 1.22.10 - ~/.nvm/versions/node/v12.20.2/bin/yarn
npm: 6.14.13 - ~/.nvm/versions/node/v12.20.2/bin/npm
Babel
@babel/core 7.14.0,
@babel/preset-env: 7.14.1

Possible solution

No response

Additional context

No response

[babel-bot]

Hey @alan-agius4! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack community that typically always has someone willing to help. You can sign-up here for an invite."

[submarines-and]

If it helps anyone:

WORKING:
const \u0275ResourceLoaderImpl_BaseFactory = 4
let x\u0275ResourceLoaderImpl_BaseFactory
var \u0275ResourceLoaderImpl_BaseFactory
let ɵResourceLoaderImpl_BaseFactory

So seems to only be an issue with "let" + first char being escaped unicode

[nicolo-ribaudo]

This actually used to work in the past: it has been broken in 7.4.0