Bind function proposal sometimes marked as invalid

[karolyi]

Hey,

I use a bind function proposal in my code that I added to my .babelrc:

{
  "presets": [
    "@babel/preset-env"
  ],
  "plugins": [
    "@babel/plugin-proposal-function-bind"
  ]
}

It basically is a notation with which you can use bound function calls without having to use Function.prototype.bind(). An example:

testfunction.bind(this)(param1, param2)

will become

::testfunction(param1, param2)

Here's the problem: lsp-tsserver sometimes marks the :: as invalid (saying expression expected:

However, if I put import range from 'lodash/range' to the imports part (the beginning), the error disappears. Honestly, this makes no sense at all:

Do you have any idea as to why this could happen?

[rchl]

Note that this syntax doesn't seem to be supported by Typescript and I believe (might be wrong) that babel configuration is not relevant to typescript checking itself.
So in theory the expected result might be to always mark it as invalid.

[karolyi]

test.zip
posting a minimal example.

Ignore the other errors, and focus on the :: part. If you remove the import range line, it will start marking the :: as invalid.