Typescript 2.6 service (tsserver): cannot reload files without open projects

[anstarovoyt]

Starting from typescript 2.6 the tsserver caches ScriptInfo-s even if there is no open projects (or files under InferredProject) with the infos.
It is a problem for us because now we cannot properly handle changed files for compilation.
Our compilation implementation (if there is no open projects / files):

1. Open project (or file if there is no configured projects for the file)
2. Run compiling
3. Close project (or file)

In previous versions the action (1) refreshed all files so all the files always were up-to-date.

After the changes in 2.6 the action (1) doesn't load actual contents for the files if the project was open before. Of course there are file watchers that will handle the content updates but they have a gap in couple seconds.

On the other side IDE has the necessary information but we cannot reload file content without open project (see src/server/session.ts:1346).

The best solution for us is to allow to run "reload" action without open project if the script info is loaded in the service.

[mhegazy]

@sheetalkamat can you take a look.

[sheetalkamat]

@anstarovoyt Before we propose and make change in the API, I would like to know the real issue here. We do watch all the files and depend on it to have correct state and set the correct text as watch callbacks are invoked so I am not sure what you mean by

Of course there are file watchers that will handle the content updates but they have a gap in couple seconds.
Is it the timing issue? Can this be not solved by delaying the compilation/project open?

Having said that we can easily make command reload to always reload contents from disk irrespective of project open (but only if script info is present in the cache). We also have few optimizations here that can be disabled for command reload but I would like to know the reasoning and understand the exact issue/need for this request so that we are handling it correctly and see if our file watching callbacks need some change as well.

[anstarovoyt]

There are several cases:

1. Our IDEs can keep non-opened, but changed files. If user explicitly call "compile" for the project we save the files and immediately send "compile" command to the service. I guess it cannot be fixed on the FW side.
2. Some users use cascade tasks before run something (test for example):
   (1) process some files -> (2) compile project -> (3) do something else. In this case IDE usually knows which files were generated / changed on the step (1) before compiling

[sheetalkamat]

@anstarovoyt Is it possible for you to check if #19479 fulfills what you asked for?

[anstarovoyt]

yes, definitely