Eliminate lodash.isequal dependency (mapbox#5979)

package.json

@@ -30,7 +30,6 @@
     "gray-matter": "^3.0.8",
     "grid-index": "^1.0.0",
     "jsonlint-lines-primitives": "~1.6.0",
-    "lodash.isequal": "^3.0.4",
     "minimist": "0.0.8",
     "package-json-versionify": "^1.0.2",
     "pbf": "^3.0.5",

src/style-spec/diff.js

@@ -1,5 +1,5 @@
 
-const isEqual = require('lodash.isequal');
+const isEqual = require('./util/deep_equal');
 
 const operations = {
 

src/style-spec/package.json

@@ -50,7 +50,6 @@
     "csscolorparser": "~1.0.2",
     "in-publish": "^2.0.0",
     "jsonlint-lines-primitives": "~1.6.0",
-    "lodash.isequal": "^3.0.4",
     "minimist": "0.0.8",
     "rw": "^1.3.3",
     "sort-object": "^0.3.2",

src/style-spec/util/deep_equal.js

@@ -0,0 +1,28 @@
+// @flow
+
+/**
+ * Deeply compares two object literals.
+ *
+ * @private
+ */
+function deepEqual(a: ?mixed, b: ?mixed): boolean {
+    if (Array.isArray(a)) {
+        if (!Array.isArray(b) || a.length !== b.length) return false;
+        for (let i = 0; i < a.length; i++) {
+            if (!deepEqual(a[i], b[i])) return false;
+        }
+        return true;
+    }
+    if (typeof a === 'object' && a !== null && b !== null) {
+        if (!(typeof b === 'object')) return false;
+        const keys = Object.keys(a);
+        if (keys.length !== Object.keys(b).length) return false;
+        for (const key in a) {
+            if (!deepEqual(a[key], b[key])) return false;
+        }
+        return true;
+    }
+    return a === b;
+}
+
+module.exports = deepEqual;

src/util/util.js

@@ -288,30 +288,7 @@ exports.filterObject = function(input: Object, iterator: Function, context?: Obj
     return output;
 };
 
-/**
- * Deeply compares two object literals.
- *
- * @private
- */
-exports.deepEqual = function(a: ?mixed, b: ?mixed): boolean {
-    if (Array.isArray(a)) {
-        if (!Array.isArray(b) || a.length !== b.length) return false;
-        for (let i = 0; i < a.length; i++) {
-            if (!exports.deepEqual(a[i], b[i])) return false;
-        }
-        return true;
-    }
-    if (typeof a === 'object' && a !== null && b !== null) {
-        if (!(typeof b === 'object')) return false;
-        const keys = Object.keys(a);
-        if (keys.length !== Object.keys(b).length) return false;
-        for (const key in a) {
-            if (!exports.deepEqual(a[key], b[key])) return false;
-        }
-        return true;
-    }
-    return a === b;
-};
+exports.deepEqual = require('../style-spec/util/deep_equal');
 
 /**
  * Deeply clones two objects.

yarn.lock

@@ -6205,14 +6205,6 @@ lodash._basefor@^3.0.0:
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/lodash._basefor/-/lodash._basefor-3.0.3.tgz#7550b4e9218ef09fad24343b612021c79b4c20c2"
 
-lodash._baseisequal@^3.0.0:
-  version "3.0.7"
-  resolved "https://registry.yarnpkg.com/lodash._baseisequal/-/lodash._baseisequal-3.0.7.tgz#d8025f76339d29342767dcc887ce5cb95a5b51f1"
-  dependencies:
-    lodash.isarray "^3.0.0"
-    lodash.istypedarray "^3.0.0"
-    lodash.keys "^3.0.0"
-
 lodash._basetostring@^3.0.0:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/lodash._basetostring/-/lodash._basetostring-3.0.1.tgz#d1861d877f824a52f669832dcaf3ee15566a07d5"
@@ -6287,13 +6279,6 @@ lodash.isarray@^3.0.0:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/lodash.isarray/-/lodash.isarray-3.0.4.tgz#79e4eb88c36a8122af86f844aa9bcd851b5fbb55"
 
-lodash.isequal@^3.0.4:
-  version "3.0.4"
-  resolved "https://registry.yarnpkg.com/lodash.isequal/-/lodash.isequal-3.0.4.tgz#1c35eb3b6ef0cd1ff51743e3ea3cf7fdffdacb64"
-  dependencies:
-    lodash._baseisequal "^3.0.0"
-    lodash._bindcallback "^3.0.0"
-
 lodash.isequal@^4.0.0:
   version "4.5.0"
   resolved "https://registry.yarnpkg.com/lodash.isequal/-/lodash.isequal-4.5.0.tgz#415c4478f2bcc30120c22ce10ed3226f7d3e18e0"