Add Find The Version Of An Installed Dependency as a JavaScript til

javascript/find-the-version-of-an-installed-dependency.md

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+# Find The Version Of An Installed Dependency
+
+I recently ran into a bug related to a specific version of a dependency. As
+part of tracking it down, I needed to figure out what version I had installed.
+
+The [`yarn list`](https://classic.yarnpkg.com/en/docs/cli/list) command can
+help with this. Without any flags, it will show a tree structure listing _every
+single_ dependency and sub-dependency that is installed for your project.
+
+Here is an example of what that looks like restricted to a pattern of `jest`.
+
+```bash
+$ yarn list --pattern jest
+
+yarn list v1.22.10
+├─ @testing-library/jest-dom@5.14.1
+├─ @types/jest@27.0.1
+├─ @types/testing-library__jest-dom@5.9.5
+│  ├─ @jest/types@26.6.2
+│  ├─ @types/jest@26.0.23
+│  ├─ jest-diff@26.6.2
+│  └─ jest-get-type@26.3.0
+...
+```
+
+I can look through this list and find the dependency and version of interest.
+
+It's still a lot of results to comb through, so what I like to do instead is
+pipe it to [`fzf`](https://github.com/junegunn/fzf).
+
+```bash
+$ yarn list | fzf
+```
+
+Then I can interactively narrow down the results with the power of FZF's fuzzy
+finding functionality.