update

node_modules/ramda/es/internal/_indexOf.js

@@ -0,0 +1,67 @@
+import equals from "../equals.js";
+export default function _indexOf(list, a, idx) {
+  var inf, item; // Array.prototype.indexOf doesn't exist below IE9
+
+  if (typeof list.indexOf === 'function') {
+    switch (typeof a) {
+      case 'number':
+        if (a === 0) {
+          // manually crawl the list to distinguish between +0 and -0
+          inf = 1 / a;
+
+          while (idx < list.length) {
+            item = list[idx];
+
+            if (item === 0 && 1 / item === inf) {
+              return idx;
+            }
+
+            idx += 1;
+          }
+
+          return -1;
+        } else if (a !== a) {
+          // NaN
+          while (idx < list.length) {
+            item = list[idx];
+
+            if (typeof item === 'number' && item !== item) {
+              return idx;
+            }
+
+            idx += 1;
+          }
+
+          return -1;
+        } // non-zero numbers can utilise Set
+
+
+        return list.indexOf(a, idx);
+      // all these types can utilise Set
+
+      case 'string':
+      case 'boolean':
+      case 'function':
+      case 'undefined':
+        return list.indexOf(a, idx);
+
+      case 'object':
+        if (a === null) {
+          // null can utilise Set
+          return list.indexOf(a, idx);
+        }
+
+    }
+  } // anything else not covered above, defer to R.equals
+
+
+  while (idx < list.length) {
+    if (equals(list[idx], a)) {
+      return idx;
+    }
+
+    idx += 1;
+  }
+
+  return -1;
+}