Typescript imports support for LWC development

[Vladimir Soskin]

I am trying to use your Illuminated Cloud plugin with intellij plugin to work with typescript based LWC component. 

And the only issue I have for now is incorrect work of ts files with imports. For example, this import

import from 'lightning/platformShowToastEvent'

works correctly with .js file, but failed to work with .ts 

Further investigations showed, that this import from .js file lead me to some kind of cache, created by IC.

Is it possible at least to add *.ts file extension to the list of associations?

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[Scott Wells]

Duplicate of #1921.