Support/feature - tscserver / hooking into tsc --watch results

[ORESoftware]

With these issues in mind:

#10879
#13588

I saw mention of "tscserver" - but I am not sure if that still exists - it sounds like that became tsc --watch?

What I want to do:

Compile a .tsx file on demand, and when it's done compiling, send a socket message to the browser, telling the browser that the file is compiled and ready to be loaded into the browser.

The problem:

The problem is thattsc --watchdoes not allow me to listen for when the compilation is finished.

Temporary solution:

So what I am currently doing now - instead of using tsc --watch, I am just running tsc as a child process on demand. When the child process closes, and exits with 0, I know compilation is done. And the problem is that it's a little bit slower this way, maybe 100 ms slower.

Longer term solution proposal:

As a better solution, it would be great to pre-start a Node.js process with tsc loaded already - essentially creating a tscserver, but I am not sure if this is possible. Alternatively, tsc --watch would allow me to somehow listen for compilation completion events.

To re-iterate, I am looking for:

• (a) a way to hook into tsc --watch, to create actions that occur after compilation completes,

and/or

• (b) a way to create tscserver that can process requests on demand, and where I can listen for compilation completion events.

Any help much appreciated, thanks.

[mhegazy]

The server supports a similar feature to tsc --watch, called compile-on-save, see https://github.com/Microsoft/TypeScript/blob/master/lib/protocol.d.ts#L893 for the server command.

tsc is just a command line tool, so running costume actions after it is done is really not in scope.

All the pieces that allow tsc --watch to work are available to you through the compiler API, so you should be able to build a process that watches changes, and calls the compiler when needed.

There are already existing tools like tsb that does more or less what you are asking for, i would recommend investigating these before building you own.

[ORESoftware]

@mhegazy thanks

I opened an issue with tsb

jrieken/gulp-tsb#61

I am not sure if they have what I am looking for, I probably can't use Gulp for this.

#14722