Refactor to resolve ESLint warning in indexeddb.ts

[odendayoko]

Provide the exact quote of the error or issue

ESLint warning @typescript-eslint/no-unnecessary-condition in the following line of indexeddb.ts.

if (!db) db = await openDatabase()

An implementation that defines db in a global variable may not be appropriate.
I would like to see it refactored so that the warning no longer appears.

Does the feature already exist? Please link to it.

No response

Are you willing to participate in fixing this issue and create a pull request with the fix?

None