fix: enable strict compilerOption to prevent errors when importing lib

[edu-muller]

Enabled all strict compiler options to increase code consistency and prevent errors when importing the library into projects that have these same settings enabled.

Fixes #204

[Remy1Berg]

Should be straight forward, am I missing something?

[bbonczek]

Hi @edu-muller. Any chance this PR could be merged and a new version released?
Having to rely on skipLibCheck for ngx-socket-io is a pretty heavy workaround for a typing issue.

[edu-muller]

Hi @edu-muller. Any chance this PR could be merged and a new version released? Having to rely on skipLibCheck for ngx-socket-io is a pretty heavy workaround for a typing issue.

I don't have permission to merge or release versions in the project, I only made some contributions through forks last year.
For that, you would have to request it from @rodgc.
In any case, I resolved the conflicts that arose since I opened the PR, and everything should be ready for the merge.