Make swr zero dependency

package.json

@@ -67,9 +67,6 @@
     "ts-jest": "25.5.1",
     "typescript": "3.6.4"
   },
-  "dependencies": {
-    "dequal": "2.0.2"
-  },
   "peerDependencies": {
     "react": "^16.11.0 || ^17.0.0"
   }

src/config.ts

@@ -1,4 +1,4 @@
-import { dequal } from 'dequal/lite'
+import deeEqual from './libs/deep-equal'
 import { Configuration, RevalidatorOptions, Revalidator } from './types'
 import Cache from './cache'
 import webPreset from './libs/web-preset'
@@ -64,7 +64,7 @@ const defaultConfig = {
   refreshWhenOffline: false,
   shouldRetryOnError: true,
   suspense: false,
-  compare: dequal,
+  compare: deeEqual,
 
   isPaused: () => false,
   ...webPreset

src/libs/deep-equal.ts

@@ -0,0 +1,31 @@
+const has = Object.prototype.hasOwnProperty
+
+export default function deeEqual(foo: any, bar: any) {
+  let ctor, len
+  if (foo === bar) return true
+
+  if (foo && bar && (ctor = foo.constructor) === bar.constructor) {
+    if (ctor === Date) return foo.getTime() === bar.getTime()
+    if (ctor === RegExp) return foo.toString() === bar.toString()
+
+    if (ctor === Array) {
+      if ((len = foo.length) === bar.length) {
+        while (len && deeEqual(foo[len], bar[len])) {
+          len--
+        }
+      }
+      return len === -1
+    }
+
+    if (!ctor || typeof foo === 'object') {
+      len = 0
+      for (ctor in foo) {
+        if (has.call(foo, ctor) && ++len && !has.call(bar, ctor)) return false
+        if (!(ctor in bar) || !deeEqual(foo[ctor], bar[ctor])) return false
+      }
+      return Object.keys(bar).length === len
+    }
+  }
+
+  return foo !== foo && bar !== bar
+}

yarn.lock

@@ -1737,11 +1737,6 @@ delayed-stream@~1.0.0:
   resolved "https://registry.yarnpkg.com/delayed-stream/-/delayed-stream-1.0.0.tgz#df3ae199acadfb7d440aaae0b29e2272b24ec619"
   integrity sha1-3zrhmayt+31ECqrgsp4icrJOxhk=
 
-[email protected]:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/dequal/-/dequal-2.0.2.tgz#85ca22025e3a87e65ef75a7a437b35284a7e319d"
-  integrity sha512-q9K8BlJVxK7hQYqa6XISGmBZbtQQWVXSrRrWreHC94rMt1QL/Impruc+7p2CYSYuVIUr+YCt6hjrs1kkdJRTug==
-
 detect-newline@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/detect-newline/-/detect-newline-3.1.0.tgz#576f5dfc63ae1a192ff192d8ad3af6308991b651"