fix: move mongodb to peerDependencies

[rfox12]

In order to allow connect-mongo to adapt to internal Typescript changes (that do not break the interface), we can specify mongodb as a peer dependency--allowing end users to use any version of mongodb they want as long as it's a minor release of driver version 4.1.x

Should close issue: #434 (comment) and issue #433 (comment) and #436 (comment)

[mingchuno]

@rfox12 You package.json break. Could you help fix it, make sure test cases pass and also update CHANGELOG.md ?

[rfox12]

@mingchuno I finally got around to finishing out this PR. All 23 tests passed for both version 4.1.0 and 4.1.1 versions of the mongodb driver. So this PR should fix problems that people are having with Typescript types being incompatible (regardless of whether they are on 4.1.0 or 4.1.1). And hopefully this means we don't have to worry about the changes when 4.1.2 (or whatever) is released.

The way you test a peer dependency is to also include the peer version you want to test in your devDependencies section of the package.json. So in this case, I tested both 4.1.0 and 4.1.1 of mongodb by making that change and building / testing twice.

Please take a look, I think this is ready for release?

[lmeerma]

Any update when this will be merged?

[rfox12]

@jdesboeufs @mingchuno My organization is happy to be a maintainer of connect-mongo. We rely on it.

[mingchuno]

PR LGTM

[codecov-commenter]

Codecov Report

Merging #435 (6e3458a) into master (3e27376) will decrease coverage by 0.55%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #435      +/-   ##
==========================================
- Coverage   82.32%   81.76%   -0.56%     
==========================================
  Files           2        2              
  Lines         181      181              
  Branches       42       42              
==========================================
- Hits          149      148       -1     
  Misses         22       22              
- Partials       10       11       +1     

Impacted Files	Coverage Δ
src/lib/MongoStore.ts	81.56% <0.00%> (-0.56%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3e27376...6e3458a. Read the comment docs.

[mingchuno]

@rfox12 Well, I am also a random guy out there that are using this repo and found it is unmaintained. So I ask @jdesboeufs if I can pick it up. I will tried to be here more often. Sadly, I don't have the admin access of this repo too.