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Performance of fsfile.tests

See original GitHub issue

In fsfile tests. Every test takes at least 1000ms ts.CreateProgram took almost time(about 1000 ms)

            let options = jsOptions<Ts.CompilerOptions>(fun o ->
                o.target <- Some ScriptTarget.ES2015
                o.``module`` <- Some ModuleKind.CommonJS
            )
            let setParentNodes = true
            let host = ts.createCompilerHost(options, setParentNodes)
            ts.createProgram(ResizeArray tsPaths, options, host)

After published ts2fable online version, I found we can create a single ts program with almost empty host for simple generation (100ms)

    let host =  jsOptions<CompilerHost>(fun o ->
        o.getSourceFile <- fun fileName -> if fileName.StartsWith "module" then Some sourceFile else None
        o.writeFile <- fun (_,_) -> ()
        o.getDefaultLibFileName <- fun _ -> "lib.d.ts"
        o.useCaseSensitiveFileNames <- fun _ -> false
        o.getCanonicalFileName <- id
        o.getCurrentDirectory <- fun _ -> ""
        o.getNewLine <- fun _ -> "\r\n"
        o.fileExists <- fun fileName -> inputFileName = fileName
        o.readFile <- fun _ -> Some ""
        o.directoryExists <- fun _ -> true
        o.getDirectories <- fun _ -> ResizeArray [] 
    )

    let program = ts.createProgram(ResizeArray [inputFileName], options, host)