Convert more things to TS

[emmatown]

Mostly things from #83

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[codecov-io]

Codecov Report

Merging #91 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage    83.2%   83.23%   +0.02%     
==========================================
  Files          31       31              
  Lines         810      811       +1     
  Branches      145      144       -1     
==========================================
+ Hits          674      675       +1     
  Misses        125      125              
  Partials       11       11

Impacted Files	Coverage Δ
packages/get-workspaces/src/index.ts	96.29% <ø> (ø)	⬆️
packages/cli/src/utils/constants.ts	100% <ø> (ø)	⬆️
...i/src/utils/bolt-replacements/getDependencyInfo.ts	100% <ø> (ø)
...utils/bolt-replacements/versionRangeToRangeType.ts	100% <ø> (ø)
.../src/utils/bolt-replacements/getDependentsGraph.ts	100% <100%> (ø)
.../src/utils/bolt-replacements/getDependencyGraph.ts	90.62% <100%> (ø)

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[Noviny]

Ell Gee Tee Emm

[Noviny]

Unrelated question: we talk about rangeType here, BUT we only support 3 of the [many] types. This hasn't burned us so far, but probably will at some point? Is it worth us trying to proactively fix this?

[emmatown]

We might want to improve it but we physically can't handle every case and other types generally aren't used that often so it's probably not something we should spend much time on.

From https://yarnpkg.com/lang/en/docs/cli/upgrade/#toc-yarn-upgrade-package-latest-l-caret-tilde-exact-pattern

The package.json file will be updated to reflect the latest version range. By default, the existing range specifier in package.json will be reused if it is one of: ^, ~, <=, >, or an exact version. Otherwise, it will be changed to a caret (^).

I think if we had the same behavior as yarn, that would probably work well.