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Viewing file:     convertDescriptorToString.js (1.25 KB)      -rw-r--r--

'use strict';

Object.defineProperty(exports, '__esModule', {
  value: true
});
exports.default = convertDescriptorToString;

/**
 * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

/* eslint-disable local/ban-types-eventually */
// See: https://github.com/facebook/jest/pull/5154
function convertDescriptorToString(descriptor) {
  if (
    typeof descriptor === 'string' ||
    typeof descriptor === 'number' ||
    descriptor === undefined
  ) {
    return descriptor;
  }

  if (typeof descriptor !== 'function') {
    throw new Error('describe expects a class, function, number, or string.');
  }

  if (descriptor.name !== undefined) {
    return descriptor.name;
  } // Fallback for old browsers, pardon Flow

  const stringified = descriptor.toString();
  const typeDescriptorMatch = stringified.match(/class|function/);
  const indexOfNameSpace = // @ts-expect-error: typeDescriptorMatch exists
    typeDescriptorMatch.index + typeDescriptorMatch[0].length;
  const indexOfNameAfterSpace = stringified.search(/\(|\{/);
  const name = stringified.substring(indexOfNameSpace, indexOfNameAfterSpace);
  return name.trim();
}