mvp

index.js

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+const fs = require('fs')
+const path = require('path')
+const readmePath = path.join(__dirname, 'readme.md')
+const names = require('all-the-package-names')
+const lower = names.filter(name => name.toLowerCase() === name)
+const mixed = names.filter(name => name.toLowerCase() !== name)
+
+// do this silliness to get a list of mixed case overlappers,
+// SORTED in the order of the lowercase names (which are sorted by average downloads)
+const flattenedMixed = mixed.map(name => name.toLowerCase())
+const overlaps = lower
+  .filter(name => flattenedMixed.includes(name))
+  .map(name => mixed.find(n => n.toLowerCase() === name))
+
+let output = `
+# Mixed Case Package Names
+
+There are ${names.length} packages in the npm registry.
+
+${mixed.length} of them have mixed-case names.
+
+${overlaps.length} of them have **overlapping names**, for which both a mixed-case and lowercase package exist.
+
+:warning: Use caution when installing packages :warning:
+
+## Overlaps
+
+(Sorted by average daily download count of the lowercase package)
+
+`
+
+overlaps.forEach(name => {
+  output += (`- [${name.toLowerCase()}](https://ghub.io/${name.toLowerCase()}) vs [${name}](https://ghub.io/${name})\n`)
+})
+
+console.log(output)
+fs.writeFileSync(readmePath, output)

package.json

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+{
+  "name": "mixed-case-package-names",
+  "version": "1.0.0",
+  "description": "A study of existing mixed-case packages in the npm registry",
+  "main": "index.js",
+  "repository": "https://github.com/nice-registry/mixed-case-package-names",
+  "author": "zeke",
+  "license": "MIT",
+  "dependencies": {
+    "all-the-package-names": "^1.3440.0",
+    "dedent": "^0.7.0"
+  }
+}