Add Link A JavaScript Package Locally as a javascript til

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_631 TILs and counting..._
+_632 TILs and counting..._
 
 ---
 
@@ -237,6 +237,7 @@ _631 TILs and counting..._
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 - [ISO-8601 Formatted Dates Are Interpreted As UTC](javascript/iso-8601-formatted-dates-are-interpreted-as-utc.md)
+- [Link A JavaScript Package Locally](javascript/link-a-javascript-package-locally.md)
 - [List Top-Level NPM Dependencies](javascript/list-top-level-npm-dependencies.md)
 - [Matching Multiple Values In A Switch Statement](javascript/matching-multiple-values-in-a-switch-statement.md)
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javascript/link-a-javascript-package-locally.md

@@ -0,0 +1,25 @@
+# Link A JavaScript Package Locally
+
+If you are putting together a JavaScript package and you'd like to test it
+out locally before putting it on NPM, use `npm link`.
+
+First, from the directory of the package you are creating run:
+
+```bash
+$ npm link
+```
+
+This will symlink the package to the global node modules directory.
+
+Then, from the base project directory that you want to try importing and
+using the package from, run:
+
+```bash
+$ npm link name-of-package
+```
+
+This will create an additional symlink from the global node modules
+directory to the `node_modules` of this target project.
+
+You'll now have access to the project, try an `import` to get what you need
+and try it out.