Could not resolve import "lit/decorators"

[AbandonedFridge]

Describe the bug
Since 0.26.0, all packages are causing a Could not resolve import "lit/decorators"... error. This appears to stem from .js being removed from all imports.

To Reproduce
Update any @material/mwc-... component to 0.26.0

Expected behavior
Module should work

[christophe-g]

Dup of #3395

[TownCube]

Using the lit recommended open-wc starter this is now broken,

npm init @open-wc --destinationPath /home/towncube/programs/main-app --type scaffold --scaffoldType app --features building --typescript true --tagName main-app --writeToDisk true --installDependencies npm

On start:

Error while transforming node_modules/@material/mwc-drawer/mwc-drawer.js: Could not resolve import "lit/decorators".

   7 | // Style preference for leading underscores.
   8 | // tslint:disable:strip-private-property-underscore
>  9 | import { customElement } from 'lit/decorators';
     |                               ^
  10 | import { DrawerBase } from './mwc-drawer-base';
  11 | import { styles } from './mwc-drawer.css';
  12 | let Drawer = class Drawer extends DrawerBase {

On build:

(!) Plugin node-resolve: Could not resolve import "lit/decorators" in /home/towncube/programs/main-app/node_modules/@material/mwc-drawer/mwc-drawer.js using exports defined in /home/towncube/programs/main-app/node_modules/lit/package.json.
(!) Plugin node-resolve: Could not resolve import "lit/directives/class-map" in /home/towncube/programs/main-app/node_modules/@material/mwc-drawer/mwc-drawer-base.js using exports defined in /home/towncube/programs/main-app/node_modules/lit/package.json.
(!) Plugin node-resolve: Could not resolve import "lit/decorators" in /home/towncube/programs/main-app/node_modules/@material/mwc-drawer/mwc-drawer-base.js using exports defined in /home/towncube/programs/main-app/node_modules/lit/package.json.
(!) Unresolved dependencies
https://rollupjs.org/guide/en/#warning-treating-module-as-external-dependency
lit/decorators (imported by node_modules/@material/mwc-drawer/mwc-drawer.js, node_modules/@material/mwc-drawer/mwc-drawer-base.js)
lit/directives/class-map (imported by node_modules/@material/mwc-drawer/mwc-drawer-base.js)

[christophe-g]

It also breaks using material components in lit playground

the console throws:

Uncaught TypeError: Failed to resolve module specifier "lit/decorators". Relative references must start with either "/", "./", or "../".

[asyncLiz]

Thanks for the reports all, we're looking into this 👍

[asyncLiz]

See #3395 for tracking