TrustedScriptURL support for workbox-window

[jeffposnick]

R: @tropicadri
CC: @budarin

Fixes #2855

This should be backwards compatible. At some point, if TrustedScriptURL is added to the TypeScript lib.dom library, we can remove the dependency on @types/trusted-types.

[cypressious]

After upgrading Workbox to 6.2.2 in my Vue project, I'm now getting a build error

 error  in Y:/Repos/xxx/Frontend/node_modules/workbox-window/Workbox.d.ts

ERROR in Y:/Repos/xxx/Frontend/node_modules/workbox-window/Workbox.d.ts(1,34):
1:34 Cannot find module 'trusted-types/lib' or its corresponding type declarations.
  > 1 | import { TrustedScriptURL } from 'trusted-types/lib';
      |                                  ^
    2 | import { WorkboxEventTarget } from './utils/WorkboxEventTarget.js';
    3 | import './_version.js';
    4 | /**

Is @types/trusted-types now a required dependency?

[jeffposnick]

I'm sorry about that—you're correct in that those type definitions should be listed in dependencies and not devDependencies to ensure that folks who install workbox-window from npm have also get the type defs.

This will be fixed in an upcoming v6.2.3 release, but in the meantime, you can explicitly add @types/trusted-types to your project if you're blocked on v6.2.2.

[jeffposnick]

This should be resolved in v6.2.3: https://github.com/GoogleChrome/workbox/releases/tag/v6.2.3