DeprecationWarning: Use of deprecated folder mapping "./" in the "exports" field

[johncrim]

When building with tslib, I'm seeing the following on every build:

(node:40688) [DEP0148] DeprecationWarning: Use of deprecated folder mapping "./" in the "exports" field module resolution of the package at <snip>\node_modules\tslib\package.json.
Update this package.json to use a subpath pattern like "./*".

I'm pretty sure this started when upgrading to Node 15.1.0.

Environment:

Angular CLI: 11.0.0
Node: 15.1.0
OS: win32 x64

Package                         Version
---------------------------------------------------------
...
typescript                      4.0.5
webpack                         4.44.2
tslib                                 2.0.3

This is an Angular project - I can provide a repro case if it's not obvious.

[johncrim]

In case it's helpful, here's another popular library fixing the same issue. It looks like the first try didn't work; so this is something that would need to be tested with multiple versions of node.

postcss/postcss#1455

[rangelier]

Any update on this?

[ericgopak]

To get the ball rolling, I've created a pull request based on the mentioned postcss solution.
#139

Tested with node v15.2.1.

[rangelier]

Thanks @ericgopak, really appreciated.

[omostan]

upgrading nodejs to v15.8.0 fixed the warnings for me

[rangelier]

@omostan this works indeed, thanks for your reply!

[johncrim]

This could be closed (though I'm not sure whether it should be), since the deprecation in node was reversed:

Some relevant PRs from node repo:
nodejs/node#35747
nodejs/node#36859

If there were a benefit to the changes aside from eliminating the warning, it might be worth keeping this open, but I'm not sure what those benefits are.

Comments on nodejs/node#36859 indicate that this deprecation may come back, but they've reversed the deprecation warnings for libs within node_modules. So I'll leave it up to the tslib maintainers to decide whether to close this, or take a fix to avoid the future deprecation.

[EricDitp]

In NodeJs 16 this issue reintroduced:
(node:7972) [DEP0148] DeprecationWarning: Use of deprecated folder mapping "./" in the "exports" field module resolution of the package at ~/node_modules/tslib/package.json.
Update this package.json to use a subpath pattern like "./*".

Versions: 16.0.0 and 16.2.0

Any news?

[karlvonbonin]

+1

[uganjha]

+1

[vinayakkulkarni]

Yep, can replicate this with v16.3.0