Feedback to improve compileOnSave with tsserver.

I have implemented inside Eclipse compile on save with tsserver by consuming compileOnSaveAffectedFileList and compileOnSaveEmitFile commands. It works great but I think we could again improved it

For compileOnSaveAffectedFileList:

• compileOnSaveAffectedFileList should throw error when the given file is excluded of tsconfig.json. It will give the capability to display an error dialog when user wishes to compile a ts file which is excluded by tsconfig.json
• in some case, tsserver compileOnSaveAffectedFileList returns *.d.ts files (see ttps://github.com/angelozerr/typescript.java/issues/190#issuecomment-317876026) those *.d.ts files must be ignored for compilation.

For compileOnSaveEmitFile:

• the reponse compileOnSaveEmitFile should return diagnostics errors. I had to call the two tsserver commands syntacticDiagnosticsSync and semantacticDiagnosticsSync after the call of compileOnSaveEmitFile to display errors in the Eclipse "Problem View"
• the reponse compileOnSaveEmitFile should return the emited files path (js and *.js.map). In Eclipse case it's very helpful because I could refresh the files.

Start with the tsserver entry points for compileOnSaveAffectedFileList and compileOnSaveEmitFile, then inspect the related syntacticDiagnosticsSync and semantacticDiagnosticsSync commands. Done means excluded files produce an error, declaration files are ignored, and compileOnSaveEmitFile reports diagnostics plus emitted JavaScript and source-map paths.