Move internal modules to “internal” folder.

.internal/baseClone.js

@@ -0,0 +1,152 @@
+import Stack from './.internal/Stack.js';
+import arrayEach from './.internal/arrayEach.js';
+import assignValue from './.internal/assignValue.js';
+import baseAssign from './.internal/baseAssign.js';
+import baseAssignIn from './.internal/baseAssignIn.js';
+import cloneBuffer from './.internal/cloneBuffer.js';
+import copyArray from './.internal/copyArray.js';
+import copySymbols from './.internal/copySymbols.js';
+import copySymbolsIn from './.internal/copySymbolsIn.js';
+import getAllKeys from './.internal/getAllKeys.js';
+import getAllKeysIn from './.internal/getAllKeysIn.js';
+import getTag from './.internal/getTag.js';
+import initCloneArray from './.internal/initCloneArray.js';
+import initCloneByTag from './.internal/initCloneByTag.js';
+import initCloneObject from './.internal/initCloneObject.js';
+import isBuffer from './isBuffer.js';
+import isObject from './isObject.js';
+import keys from './keys.js';
+
+/** Used to compose bitmasks for cloning. */
+const CLONE_DEEP_FLAG = 1;
+const CLONE_FLAT_FLAG = 2;
+const CLONE_SYMBOLS_FLAG = 4;
+
+/** `Object#toString` result references. */
+const argsTag = '[object Arguments]';
+const arrayTag = '[object Array]';
+const boolTag = '[object Boolean]';
+const dateTag = '[object Date]';
+const errorTag = '[object Error]';
+const funcTag = '[object Function]';
+const genTag = '[object GeneratorFunction]';
+const mapTag = '[object Map]';
+const numberTag = '[object Number]';
+const objectTag = '[object Object]';
+const regexpTag = '[object RegExp]';
+const setTag = '[object Set]';
+const stringTag = '[object String]';
+const symbolTag = '[object Symbol]';
+const weakMapTag = '[object WeakMap]';
+
+const arrayBufferTag = '[object ArrayBuffer]';
+const dataViewTag = '[object DataView]';
+const float32Tag = '[object Float32Array]';
+const float64Tag = '[object Float64Array]';
+const int8Tag = '[object Int8Array]';
+const int16Tag = '[object Int16Array]';
+const int32Tag = '[object Int32Array]';
+const uint8Tag = '[object Uint8Array]';
+const uint8ClampedTag = '[object Uint8ClampedArray]';
+const uint16Tag = '[object Uint16Array]';
+const uint32Tag = '[object Uint32Array]';
+
+/** Used to identify `toStringTag` values supported by `clone`. */
+const cloneableTags = {};
+cloneableTags[argsTag] = cloneableTags[arrayTag] =
+cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
+cloneableTags[boolTag] = cloneableTags[dateTag] =
+cloneableTags[float32Tag] = cloneableTags[float64Tag] =
+cloneableTags[int8Tag] = cloneableTags[int16Tag] =
+cloneableTags[int32Tag] = cloneableTags[mapTag] =
+cloneableTags[numberTag] = cloneableTags[objectTag] =
+cloneableTags[regexpTag] = cloneableTags[setTag] =
+cloneableTags[stringTag] = cloneableTags[symbolTag] =
+cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
+cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
+cloneableTags[errorTag] = cloneableTags[funcTag] =
+cloneableTags[weakMapTag] = false;
+
+/**
+ * The base implementation of `clone` and `cloneDeep` which tracks
+ * traversed objects.
+ *
+ * @private
+ * @param {*} value The value to clone.
+ * @param {boolean} bitmask The bitmask flags.
+ *  1 - Deep clone
+ *  2 - Flatten inherited properties
+ *  4 - Clone symbols
+ * @param {Function} [customizer] The function to customize cloning.
+ * @param {string} [key] The key of `value`.
+ * @param {Object} [object] The parent object of `value`.
+ * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
+ * @returns {*} Returns the cloned value.
+ */
+function baseClone(value, bitmask, customizer, key, object, stack) {
+  let result;
+  const isDeep = bitmask & CLONE_DEEP_FLAG;
+  const isFlat = bitmask & CLONE_FLAT_FLAG;
+  const isFull = bitmask & CLONE_SYMBOLS_FLAG;
+
+  if (customizer) {
+    result = object ? customizer(value, key, object, stack) : customizer(value);
+  }
+  if (result !== undefined) {
+    return result;
+  }
+  if (!isObject(value)) {
+    return value;
+  }
+  const isArr = Array.isArray(value);
+  if (isArr) {
+    result = initCloneArray(value);
+    if (!isDeep) {
+      return copyArray(value, result);
+    }
+  } else {
+    const tag = getTag(value);
+    const isFunc = tag == funcTag || tag == genTag;
+
+    if (isBuffer(value)) {
+      return cloneBuffer(value, isDeep);
+    }
+    if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
+      result = (isFlat || isFunc) ? {} : initCloneObject(value);
+      if (!isDeep) {
+        return isFlat
+          ? copySymbolsIn(value, baseAssignIn(result, value))
+          : copySymbols(value, baseAssign(result, value));
+      }
+    } else {
+      if (!cloneableTags[tag]) {
+        return object ? value : {};
+      }
+      result = initCloneByTag(value, tag, baseClone, isDeep);
+    }
+  }
+  // Check for circular references and return its corresponding clone.
+  stack || (stack = new Stack);
+  const stacked = stack.get(value);
+  if (stacked) {
+    return stacked;
+  }
+  stack.set(value, result);
+
+  const keysFunc = isFull
+    ? (isFlat ? getAllKeysIn : getAllKeys)
+    : (isFlat ? keysIn : keys);
+
+  const props = isArr ? undefined : keysFunc(value);
+  arrayEach(props || value, (subValue, key) => {
+    if (props) {
+      key = subValue;
+      subValue = value[key];
+    }
+    // Recursively populate clone (susceptible to call stack limits).
+    assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
+  });
+  return result;
+}
+
+export default baseClone;