Breaking changes in tsserver API between 2.3.0rc and 2.3.1.

[anstarovoyt]

Hi. We (WebStorm & Intellij IDEA) use public API of tsserver (in fact we use 'tsserverlibrary.js') and every time when you introduce changes in the public API we have to change our code accordingly.
For example this commit 3cc379c
changed the constructor of the exported class "Session" and we really depend on it.

Could you please not introduce breaking changes in stable branches?
rel. https://youtrack.jetbrains.com/issue/WEB-26641

cc @RyanCavanaugh

[mhegazy]

This slipped through unnoticed, and is not intentional. we will try and get a fix for you shortelly. sorry for the hassle.

[RyanCavanaugh]

@anstarovoyt I'll have a fix up shortly that you can try locally

[mhegazy]

TypeScript 2.3.2 should be available now with the fix. sorry for the trouble.

[anstarovoyt]

@mhegazy awesome! Thank you

[alexeagle]

Are you tracking a fix for the root cause here? Seems like there is some missing testing that would have caught the API instability.

[mhegazy]

yes. we now have tests that baseline the API.