chore: flatten src/ to root

ink/widest-line.ts

@@ -0,0 +1,19 @@
+import { lineWidth } from './line-width-cache.js'
+
+export function widestLine(string: string): number {
+  let maxWidth = 0
+  let start = 0
+
+  while (start <= string.length) {
+    const end = string.indexOf('\n', start)
+    const line =
+      end === -1 ? string.substring(start) : string.substring(start, end)
+
+    maxWidth = Math.max(maxWidth, lineWidth(line))
+
+    if (end === -1) break
+    start = end + 1
+  }
+
+  return maxWidth
+}