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node_modules/core-js/modules/es.array.flat.js

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+'use strict';
+var $ = require('../internals/export');
+var flattenIntoArray = require('../internals/flatten-into-array');
+var toObject = require('../internals/to-object');
+var lengthOfArrayLike = require('../internals/length-of-array-like');
+var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
+var arraySpeciesCreate = require('../internals/array-species-create');
+
+// `Array.prototype.flat` method
+// https://tc39.es/ecma262/#sec-array.prototype.flat
+$({ target: 'Array', proto: true }, {
+  flat: function flat(/* depthArg = 1 */) {
+    var depthArg = arguments.length ? arguments[0] : undefined;
+    var O = toObject(this);
+    var sourceLen = lengthOfArrayLike(O);
+    var A = arraySpeciesCreate(O, 0);
+    A.length = flattenIntoArray(A, O, O, sourceLen, 0, depthArg === undefined ? 1 : toIntegerOrInfinity(depthArg));
+    return A;
+  }
+});