Suggestion : Add a compiler flag to treat errors as warnings

[ifle]

Add a compiler flag to treat errors as warnings.
That will be very helpful in case of migration from legacy javascript project to typescript

[RyanCavanaugh]

Other than printing

a.ts(12,12): warning TS2345

instead of

a.ts(12,12): error TS2345

what would you expect this flag to do, behaviorally?

[ifle]

That will allows to compile asp.net web project in VS without compile errors.
For now the build is fail. We have the legacy asp.net project . We started migration from js to ts. In the first stage we renamed all js files to ts. There are a lot typescript errors, but generated js is still valid.

[mribichich]

Same for me, I have a couple of errors that I know there ok, but since typescript treats them as errors the build fails.

[mhegazy]

what are the errors if i may ask?

[onzag]

How is this going, I have thousand of errors because I am running a migration, but the build fails because of the errors, giving a lot of log messages in webpack, I simply can't fix them all.

[mhegazy]

How is this going, I have thousand of errors because I am running a migration, but the build fails because of the errors, giving a lot of log messages in webpack, I simply can't fix them all.

what is your build driver? MSBuild?

[aminpaks]

I think the new compiler @ts-ignore flag will cover this no?

[ifle]

That is right direction :). In my case the best solution is adding the flag to the tsconfig with optional list of ignored errors

[aminpaks]

@ifle apparently the topic is more complicated that I thought. Read what @alexeagle has to say about this

[alexeagle]

I agree, for violations of the type system or language spec, // @ts-ignore gives you an extra freedom to disable errors during a migration.

[KodaPOwER]

Any news on this?
How can i just compile even on error? We are migrating from js to ts.
I have a lot of file just renamed to .ts waiting to be converted.
If i compile on save, i have the error in the error list but the js file is emitted.
Instead msbuild stop on the error and that broke my CI in teamcity.
Why i can't replicate this behavior in msbuild? I can't flag 2000+ lines with // @ts-ignore

[bodinsamuel]

Hello, It's a been long time and the issue is not closed.
Is it something you are planning? thanks :)

[RyanCavanaugh]

I think the only thing left to address here is the msbuild scenario, which is effectively tracked at #13280

[QingLeiLi]

Maybe we should add a ts config option to prevent the error to throw.

[nbkhope]

Was this feature ever implemented? I too would love to have errors be just warnings as it helps migrating a codebase from JS to TS.

[TomasHubelbauer]

Would be cool to be able to treat unused imports as errors.