first version

node_modules/tailwindcss/src/lib/getModuleDependencies.js

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+import fs from 'fs'
+import path from 'path'
+import resolve from 'resolve'
+import detective from 'detective'
+
+function createModule(file) {
+  const source = fs.readFileSync(file, 'utf-8')
+  const requires = detective(source)
+
+  return { file, requires }
+}
+
+export default function getModuleDependencies(entryFile) {
+  const rootModule = createModule(entryFile)
+  const modules = [rootModule]
+
+  // Iterate over the modules, even when new
+  // ones are being added
+  for (const mdl of modules) {
+    mdl.requires
+      .filter((dep) => {
+        // Only track local modules, not node_modules
+        return dep.startsWith('./') || dep.startsWith('../')
+      })
+      .forEach((dep) => {
+        try {
+          const basedir = path.dirname(mdl.file)
+          const depPath = resolve.sync(dep, { basedir })
+          const depModule = createModule(depPath)
+
+          modules.push(depModule)
+        } catch (_err) {
+          // eslint-disable-next-line no-empty
+        }
+      })
+  }
+
+  return modules
+}