refactor(theme): remove flat dependency

.changeset/strong-shoes-exist.md

@@ -0,0 +1,5 @@
+---
+"@heroui/theme": patch
+---
+
+remove flat dependencies (#6148)

packages/core/theme/package.json

@@ -49,7 +49,6 @@
     "color": "^4.2.3",
     "color2k": "^2.0.3",
     "deepmerge": "4.3.1",
-    "flat": "^5.0.2",
     "tailwind-variants": "3.2.2",
     "tailwind-merge": "3.4.0",
     "@heroui/shared-utils": "workspace:*"

packages/core/theme/src/utils/object.ts

@@ -1,5 +1,3 @@
-import flatten from "flat";
-
 export function swapColorValues<T extends Object>(colors: T) {
   const swappedColors = {};
   const keys = Object.keys(colors);
@@ -40,6 +38,57 @@ export function removeDefaultKeys<T extends Object>(obj: T) {
   return newObj;
 }
 
+function isBuffer(obj) {
+  return (
+    obj &&
+    obj.constructor &&
+    typeof obj.constructor.isBuffer === "function" &&
+    obj.constructor.isBuffer(obj)
+  );
+}
+
+function keyIdentity(key) {
+  return key;
+}
+
+export function flatten(target, opts) {
+  opts = opts || {};
+
+  const delimiter = opts.delimiter || ".";
+  const maxDepth = opts.maxDepth;
+  const transformKey = opts.transformKey || keyIdentity;
+  const output = {};
+
+  function step(object, prev, currentDepth) {
+    currentDepth = currentDepth || 1;
+    Object.keys(object).forEach(function (key) {
+      const value = object[key];
+      const isarray = opts.safe && Array.isArray(value);
+      const type = Object.prototype.toString.call(value);
+      const isbuffer = isBuffer(value);
+      const isobject = type === "[object Object]" || type === "[object Array]";
+
+      const newKey = prev ? prev + delimiter + transformKey(key) : transformKey(key);
+
+      if (
+        !isarray &&
+        !isbuffer &&
+        isobject &&
+        Object.keys(value).length &&
+        (!opts.maxDepth || currentDepth < maxDepth)
+      ) {
+        return step(value, newKey, currentDepth + 1);
+      }
+
+      output[newKey] = value;
+    });
+  }
+
+  step(target, null, null);
+
+  return output;
+}
+
 /**
  *
  * Flatten theme object and remove default keys