Move SetCache modules into SetCache.

.internal/SetCache.js

@@ -1,16 +1,17 @@
 import MapCache from './.internal/MapCache.js';
-import setCacheAdd from './.internal/setCacheAdd.js';
-import setCacheHas from './.internal/setCacheHas.js';
 
-/**
- *
- * Creates an array cache object to store unique values.
- *
- * @private
- * @constructor
- * @param {Array} [values] The values to cache.
- */
+/** Used to stand-in for `undefined` hash values. */
+const HASH_UNDEFINED = '__lodash_hash_undefined__';
+
 class SetCache {
+
+  /**
+   * Creates an array cache object to store unique values.
+   *
+   * @private
+   * @constructor
+   * @param {Array} [values] The values to cache.
+   */
   constructor(values) {
     let index = -1;
     const length = values == null ? 0 : values.length;
@@ -20,10 +21,32 @@ class SetCache {
       this.add(values[index]);
     }
   }
+
+  /**
+   * Adds `value` to the array cache.
+   *
+   * @memberOf SetCache
+   * @alias push
+   * @param {*} value The value to cache.
+   * @returns {Object} Returns the cache instance.
+   */
+  add(value) {
+    this.__data__.set(value, HASH_UNDEFINED);
+    return this;
+  }
+
+  /**
+   * Checks if `value` is in the array cache.
+   *
+   * @memberOf SetCache
+   * @param {*} value The value to search for.
+   * @returns {number} Returns `true` if `value` is found, else `false`.
+   */
+  has(value) {
+    return this.__data__.has(value);
+  }
 }
 
-// Add methods to `SetCache`.
-SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
-SetCache.prototype.has = setCacheHas;
+SetCache.prototype.push = SetCache.prototype.add;
 
 export default SetCache;

.internal/setCacheAdd.js

@@ -1,19 +0,0 @@
-/** Used to stand-in for `undefined` hash values. */
-const HASH_UNDEFINED = '__lodash_hash_undefined__';
-
-/**
- * Adds `value` to the array cache.
- *
- * @private
- * @name add
- * @memberOf SetCache
- * @alias push
- * @param {*} value The value to cache.
- * @returns {Object} Returns the cache instance.
- */
-function setCacheAdd(value) {
-  this.__data__.set(value, HASH_UNDEFINED);
-  return this;
-}
-
-export default setCacheAdd;

.internal/setCacheHas.js

@@ -1,14 +0,0 @@
-/**
- * Checks if `value` is in the array cache.
- *
- * @private
- * @name has
- * @memberOf SetCache
- * @param {*} value The value to search for.
- * @returns {number} Returns `true` if `value` is found, else `false`.
- */
-function setCacheHas(value) {
-  return this.__data__.has(value);
-}
-
-export default setCacheHas;