ERROR in node_modules/firebase/index.d.ts(134,13): error TS2304: Cannot find name 'unknown'.

[kartik-sampath]

Angular version 6
typescript 2.9.2
node 8.9.4
firebase 7.4

[google-oss-bot]

I found a few problems with this issue:

• I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.
• This issue does not seem to follow the issue template. Make sure you provide all the required information.

[zarko-tg]

typescript 2.8.4

[Feiyang1]

Thanks for the report! #2434 introduced the type unknown that's added in Typescript 3.0. It is technically a breaking change, so it should be done in a major release, we will revert the change.

For now, can you please stay at 7.11.0, or if possible, upgrade your typescript to 3.0 or above?

[zarko-tg]

@Feiyang1 We're staying on 7.11.0 for now. Upgrading Typescript is usually the least desirable option as it's typically locked/recommended to some version by one or another framework (version).