Add code comment and format DataTableTypes.d.ts

Author: metonym

src/DataTable/DataTableTypes.d.ts

@@ -2,16 +2,17 @@ type PathDepth = [never, 0, 1, 2, ...0[]];
 
 type Join<K, P> = K extends string | number
   ? P extends string | number
-    ? `${K}${"" extends P ? "" : "."}${P}`
-    : never
+  ? `${K}${"" extends P ? "" : "."}${P}`
+  : never
   : never;
 
+// For performance, the maximum traversal depth is 10.
 export type PropertyPath<T, D extends number = 10> = [D] extends [never]
   ? never
   : T extends object
   ? {
-      [K in keyof T]-?: K extends string | number
-        ? `${K}` | Join<K, PropertyPath<T[K], PathDepth[D]>>
-        : never;
-    }[keyof T]
+    [K in keyof T]-?: K extends string | number
+    ? `${K}` | Join<K, PropertyPath<T[K], PathDepth[D]>>
+    : never;
+  }[keyof T]
   : "";

types/DataTable/DataTableTypes.d.ts

@@ -2,16 +2,17 @@ type PathDepth = [never, 0, 1, 2, ...0[]];
 
 type Join<K, P> = K extends string | number
   ? P extends string | number
-    ? `${K}${"" extends P ? "" : "."}${P}`
-    : never
+  ? `${K}${"" extends P ? "" : "."}${P}`
+  : never
   : never;
 
+// For performance, the maximum traversal depth is 10.
 export type PropertyPath<T, D extends number = 10> = [D] extends [never]
   ? never
   : T extends object
   ? {
-      [K in keyof T]-?: K extends string | number
-        ? `${K}` | Join<K, PropertyPath<T[K], PathDepth[D]>>
-        : never;
-    }[keyof T]
+    [K in keyof T]-?: K extends string | number
+    ? `${K}` | Join<K, PropertyPath<T[K], PathDepth[D]>>
+    : never;
+  }[keyof T]
   : "";