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node_modules/array-flatten/array-flatten.js

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+'use strict'
+
+/**
+ * Expose `arrayFlatten`.
+ */
+module.exports = flatten
+module.exports.from = flattenFrom
+module.exports.depth = flattenDepth
+module.exports.fromDepth = flattenFromDepth
+
+/**
+ * Flatten an array.
+ *
+ * @param  {Array} array
+ * @return {Array}
+ */
+function flatten (array) {
+  if (!Array.isArray(array)) {
+    throw new TypeError('Expected value to be an array')
+  }
+
+  return flattenFrom(array)
+}
+
+/**
+ * Flatten an array-like structure.
+ *
+ * @param  {Array} array
+ * @return {Array}
+ */
+function flattenFrom (array) {
+  return flattenDown(array, [])
+}
+
+/**
+ * Flatten an array-like structure with depth.
+ *
+ * @param  {Array}  array
+ * @param  {number} depth
+ * @return {Array}
+ */
+function flattenDepth (array, depth) {
+  if (!Array.isArray(array)) {
+    throw new TypeError('Expected value to be an array')
+  }
+
+  return flattenFromDepth(array, depth)
+}
+
+/**
+ * Flatten an array-like structure with depth.
+ *
+ * @param  {Array}  array
+ * @param  {number} depth
+ * @return {Array}
+ */
+function flattenFromDepth (array, depth) {
+  if (typeof depth !== 'number') {
+    throw new TypeError('Expected the depth to be a number')
+  }
+
+  return flattenDownDepth(array, [], depth)
+}
+
+/**
+ * Flatten an array indefinitely.
+ *
+ * @param  {Array} array
+ * @param  {Array} result
+ * @return {Array}
+ */
+function flattenDown (array, result) {
+  for (var i = 0; i < array.length; i++) {
+    var value = array[i]
+
+    if (Array.isArray(value)) {
+      flattenDown(value, result)
+    } else {
+      result.push(value)
+    }
+  }
+
+  return result
+}
+
+/**
+ * Flatten an array with depth.
+ *
+ * @param  {Array}  array
+ * @param  {Array}  result
+ * @param  {number} depth
+ * @return {Array}
+ */
+function flattenDownDepth (array, result, depth) {
+  depth--
+
+  for (var i = 0; i < array.length; i++) {
+    var value = array[i]
+
+    if (depth > -1 && Array.isArray(value)) {
+      flattenDownDepth(value, result, depth)
+    } else {
+      result.push(value)
+    }
+  }
+
+  return result
+}