Replace Repeated Characters with JavaScript

URLs can be tricky to work with because they can be more complicated than the traditional URL format you type in.  I was again reminded of this when I was parsing Webpack URLs when I saw this beauty:

webpack-internal:///../rbd/pnpm-volume/144384a5-85d9-4142-b9b9-168eea22eb97/node_modules/.registry.npmjs.org/fbjs/0.8.17/node_modules/fbjs/lib/isNode.js

I parsed the URL with new URL("....") but saw that the pathname included every leading slash:

///../rbd/pnpm-volume/144384a5-85d9-4142-b9b9-168eea22eb97/node_modules/.registry.npmjs.org/fbjs/0.8.17/node_modules/fbjs/lib/isNode.js


Since I wanted to display a sane pathname, I wanted to figure out how to remove/replace repeated characters with JavaScript.  It was actually easier than I thought it would be:

const prettyPath = urlObj.

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