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node_modules/core-js/modules/es.array.find-index.js

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+'use strict';
+var $ = require('../internals/export');
+var $findIndex = require('../internals/array-iteration').findIndex;
+var addToUnscopables = require('../internals/add-to-unscopables');
+
+var FIND_INDEX = 'findIndex';
+var SKIPS_HOLES = true;
+
+// Shouldn't skip holes
+// eslint-disable-next-line es/no-array-prototype-findindex -- testing
+if (FIND_INDEX in []) Array(1)[FIND_INDEX](function () { SKIPS_HOLES = false; });
+
+// `Array.prototype.findIndex` method
+// https://tc39.es/ecma262/#sec-array.prototype.findindex
+$({ target: 'Array', proto: true, forced: SKIPS_HOLES }, {
+  findIndex: function findIndex(callbackfn /* , that = undefined */) {
+    return $findIndex(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
+  }
+});
+
+// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
+addToUnscopables(FIND_INDEX);