1  'use strict';
 2  
 3  Object.defineProperty(exports, '__esModule', {
 4    value: true
 5  });
 6  exports.default = convertDescriptorToString;
 7  
 8  /**
 9   * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
10   *
11   * This source code is licensed under the MIT license found in the
12   * LICENSE file in the root directory of this source tree.
13   */
14  
15  /* eslint-disable local/ban-types-eventually */
16  // See: https://github.com/facebook/jest/pull/5154
17  function convertDescriptorToString(descriptor) {
18    if (
19      typeof descriptor === 'string' ||
20      typeof descriptor === 'number' ||
21      descriptor === undefined
22    ) {
23      return descriptor;
24    }
25  
26    if (typeof descriptor !== 'function') {
27      throw new Error('describe expects a class, function, number, or string.');
28    }
29  
30    if (descriptor.name !== undefined) {
31      return descriptor.name;
32    } // Fallback for old browsers, pardon Flow
33  
34    const stringified = descriptor.toString();
35    const typeDescriptorMatch = stringified.match(/class|function/);
36    const indexOfNameSpace = // @ts-expect-error: typeDescriptorMatch exists
37      typeDescriptorMatch.index + typeDescriptorMatch[0].length;
38    const indexOfNameAfterSpace = stringified.search(/\(|\{/);
39    const name = stringified.substring(indexOfNameSpace, indexOfNameAfterSpace);
40    return name.trim();
41  }