Unexpected messages in Visual Studio "warning : Unknown output"

[NoelAbrahams]

Hi,

I installed 2.0.2 Beta to test out a bug fix. Then I uninstalled it and reverted to TS 2.0 Beta.

However, something has changed in spite of my reverting to the earlier version (which didn't have this problem). I'm now getting a warning line printed for those errors that have related information. Here is an example:

TypeScript Version: 2.0 RC/ VS 2105 Update 3

Code

// A *self-contained* demonstration of the problem follows...

interface Foo {

    bar: string;
}

interface Bar {
    foo: number;
}

let f: Foo;
let b: Bar;

// error TS2339: Build:Property 'xyz' does not exist on type 'Foo'
f.xyz;

// error TS2322: Build: Type 'Bar' is not assignable to type 'Foo'.
// C:\Program Files (x86) \MSBuild\Microsoft\VisualStudio\v14.0\TypeScript\Microsoft.TypeScript.targets(252, 5): warning: Unknown output: Property 'bar' is missing in type 'Bar'.
f = b;

Expected behavior:

Only the error should be printed for the second case f = b.

Actual behavior:

Both the error and a warning are printed to the output.

I hope this was not thought up as a feature, because I find it terribly distracting. The output is a mess of warnings and errors.

Thanks!

[mhegazy]

Just to make sure I understand the issue, you are seeing this error after a build? if so can you share the log of your build with "--verbosity detailed"

[NoelAbrahams]

@mhegazy,

Just to be clear, it's not the error that is the problem, there is also a warning being printed out to the output window that is making it very difficult to identify the error line. Here is a screenshot of it:

Here's the output with detailed verbosity settings:

1>Task "VsTsc"
1>  C:\Program Files (x86)\Microsoft SDKs\TypeScript\2.0\tsc.exe  --sourcemap --target ES5 --noEmitOnError --locale en-US --listEmittedFiles "B:\New folder\app.ts"
1>B:\New folder\app.ts(15,3): error TS2339: Build:Property 'xyz' does not exist on type 'Foo'.
1>B:\New folder\app.ts(19,1): error TS2322: Build:Type 'Bar' is not assignable to type 'Foo'.
1>C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\TypeScript\Microsoft.TypeScript.targets(251,5): warning : Unknown output:   Property 'bar' is missing in type 'Bar'.
1>  The command exited with code 1.
1>Done executing task "VsTsc" -- FAILED.

Edit: cleaned up log

[mhegazy]

the invalid warning message is coming from our tasks file. @paulvanbrenk can you take a look.

[paulvanbrenk]

@mhegazy The compiler shouldn't output errors on multiple lines... we used to ignore those extra lines. We can do that again, or the compiler could match expected MSBuild behavior

[mhegazy]

talked about this offline, we should not emit this message in the log in the normal level, possibly in diagnostic level.

[NoelAbrahams]

@paulvanbrenk, thanks for fixing this. Is there a way to turn this off locally in the meantime?

[paulvanbrenk]

@NoelAbrahams No, unfortunately there is not.

[paulvanbrenk]

This should be published as part of the Nuget beta package on MyGet tonight, and will be part of 2.0 RTM