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+# uuid [![CI](https://github.com/uuidjs/uuid/workflows/CI/badge.svg)](https://github.com/uuidjs/uuid/actions?query=workflow%3ACI) [![Browser](https://github.com/uuidjs/uuid/workflows/Browser/badge.svg)](https://github.com/uuidjs/uuid/actions?query=workflow%3ABrowser)
+For the creation of [RFC4122](http://www.ietf.org/rfc/rfc4122.txt) UUIDs
+- **Complete** - Support for RFC4122 version 1, 3, 4, and 5 UUIDs
+- **Cross-platform** - Support for ...
+  - CommonJS, [ECMAScript Modules](#ecmascript-modules) and [CDN builds](#cdn-builds)
+  - Node 8, 10, 12, 14
+  - Chrome, Safari, Firefox, Edge, IE 11 browsers
+  - Webpack and rollup.js module bundlers
+  - [React Native / Expo](#react-native--expo)
+- **Secure** - Cryptographically-strong random values
+- **Small** - Zero-dependency, small footprint, plays nice with "tree shaking" packagers
+- **CLI** - Includes the [`uuid` command line](#command-line) utility
+**Upgrading from `uuid@3.x`?** Your code is probably okay, but check out [Upgrading From `uuid@3.x`](#upgrading-from-uuid3x) for details.
+## Quickstart
+To create a random UUID...
+**1. Install**
+# uuid [![Build Status](https://secure.travis-ci.org/kelektiv/node-uuid.svg?branch=master)](http://travis-ci.org/kelektiv/node-uuid) #
+Simple, fast generation of [RFC4122](http://www.ietf.org/rfc/rfc4122.txt) UUIDS.
+Features:
+* Support for version 1, 3, 4 and 5 UUIDs
+* Cross-platform
+* Uses cryptographically-strong random number APIs (when available)
+* Zero-dependency, small footprint (... but not [this small](https://gist.github.com/982883))
+[**Deprecation warning**: The use of `require('uuid')` is deprecated and will not be
+supported after version 3.x of this module.  Instead, use `require('uuid/[v1|v3|v4|v5]')` as shown in the examples below.]
+## Quickstart - CommonJS (Recommended)
 ```shell
 …
 ```
+**2. Create a UUID** (ES6 module syntax)
+```javascript
+import { v4 as uuidv4 } from 'uuid';
+uuidv4(); // ⇨ '9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d'
+```
+... or using CommonJS syntax:
+```javascript
+const { v4: uuidv4 } = require('uuid');
+Then generate your uuid version of choice ...
+Version 1 (timestamp):
+```javascript
+const uuidv1 = require('uuid/v1');
+uuidv1(); // ⇨ '2c5ea4c0-4067-11e9-8bad-9b1deb4d3b7d'
+```
+Version 3 (namespace):
+```javascript
+const uuidv3 = require('uuid/v3');
+// ... using predefined DNS namespace (for domain names)
+uuidv3('hello.example.com', uuidv3.DNS); // ⇨ '9125a8dc-52ee-365b-a5aa-81b0b3681cf6'
+// ... using predefined URL namespace (for, well, URLs)
+uuidv3('http://example.com/hello', uuidv3.URL); // ⇨ 'c6235813-3ba4-3801-ae84-e0a6ebb7d138'
+// ... using a custom namespace
+//
+// Note: Custom namespaces should be a UUID string specific to your application!
+// E.g. the one here was generated using this modules `uuid` CLI.
+const MY_NAMESPACE = '1b671a64-40d5-491e-99b0-da01ff1f3341';
+uuidv3('Hello, World!', MY_NAMESPACE); // ⇨ 'e8b5a51d-11c8-3310-a6ab-367563f20686'
+```
+Version 4 (random):
+```javascript
+const uuidv4 = require('uuid/v4');
 uuidv4(); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
+```
+For timestamp UUIDs, namespace UUIDs, and other options read on ...
+## API Summary
+|  |  |  |
+| --- | --- | --- |
+| [`uuid.NIL`](#uuidnil) | The nil UUID string (all zeros) | New in `uuid@8.3` |
+| [`uuid.parse()`](#uuidparsestr) | Convert UUID string to array of bytes | New in `uuid@8.3` |
+| [`uuid.stringify()`](#uuidstringifyarr-offset) | Convert array of bytes to UUID string | New in `uuid@8.3` |
+| [`uuid.v1()`](#uuidv1options-buffer-offset) | Create a version 1 (timestamp) UUID |  |
+| [`uuid.v3()`](#uuidv3name-namespace-buffer-offset) | Create a version 3 (namespace w/ MD5) UUID |  |
+| [`uuid.v4()`](#uuidv4options-buffer-offset) | Create a version 4 (random) UUID |  |
+| [`uuid.v5()`](#uuidv5name-namespace-buffer-offset) | Create a version 5 (namespace w/ SHA-1) UUID |  |
+| [`uuid.validate()`](#uuidvalidatestr) | Test a string to see if it is a valid UUID | New in `uuid@8.3` |
+| [`uuid.version()`](#uuidversionstr) | Detect RFC version of a UUID | New in `uuid@8.3` |
+```
+Version 5 (namespace):
+```javascript
+const uuidv5 = require('uuid/v5');
+// ... using predefined DNS namespace (for domain names)
+uuidv5('hello.example.com', uuidv5.DNS); // ⇨ 'fdda765f-fc57-5604-a269-52a7df8164ec'
+// ... using predefined URL namespace (for, well, URLs)
+uuidv5('http://example.com/hello', uuidv5.URL); // ⇨ '3bbcee75-cecc-5b56-8031-b6641c1ed1f1'
+// ... using a custom namespace
+//
+// Note: Custom namespaces should be a UUID string specific to your application!
+// E.g. the one here was generated using this modules `uuid` CLI.
+const MY_NAMESPACE = '1b671a64-40d5-491e-99b0-da01ff1f3341';
+uuidv5('Hello, World!', MY_NAMESPACE); // ⇨ '630eb68f-e0fa-5ecc-887a-7c7a62614681'
+```
 ## API
+### uuid.NIL
+The nil UUID string (all zeros).
+Example:
+```javascript
+import { NIL as NIL_UUID } from 'uuid';
+NIL_UUID; // ⇨ '00000000-0000-0000-0000-000000000000'
+```
+### uuid.parse(str)
+Convert UUID string to array of bytes
+|           |                                          |
+| --------- | ---------------------------------------- |
+| `str`     | A valid UUID `String`                    |
+| _returns_ | `Uint8Array[16]`                         |
+| _throws_  | `TypeError` if `str` is not a valid UUID |
+Note: Ordering of values in the byte arrays used by `parse()` and `stringify()` follows the left &Rarr; right order of hex-pairs in UUID strings. As shown in the example below.
+Example:
+```javascript
+import { parse as uuidParse } from 'uuid';
+// Parse a UUID
+const bytes = uuidParse('6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b');
+// Convert to hex strings to show byte order (for documentation purposes)
+[...bytes].map((v) => v.toString(16).padStart(2, '0')); // ⇨
+  // [
+  //   '6e', 'c0', 'bd', '7f',
+  //   '11', 'c0', '43', 'da',
+  //   '97', '5e', '2a', '8a',
+  //   'd9', 'eb', 'ae', '0b'
+  // ]
+```
+### uuid.stringify(arr[, offset])
+Convert array of bytes to UUID string
+|                |                                                                              |
+| -------------- | ---------------------------------------------------------------------------- |
+| `arr`          | `Array`-like collection of 16 values (starting from `offset`) between 0-255. |
+| [`offset` = 0] | `Number` Starting index in the Array                                         |
+| _returns_      | `String`                                                                     |
+| _throws_       | `TypeError` if a valid UUID string cannot be generated                       |
+Note: Ordering of values in the byte arrays used by `parse()` and `stringify()` follows the left &Rarr; right order of hex-pairs in UUID strings. As shown in the example below.
+Example:
+```javascript
+import { stringify as uuidStringify } from 'uuid';
+const uuidBytes = [
+x6e,
+xc0,
+xbd,
+x7f,
+x11,
+xc0,
+x43,
+xda,
+x97,
+x5e,
+x2a,
+x8a,
+xd9,
+xeb,
+xae,
+x0b,
+];
+uuidStringify(uuidBytes); // ⇨ '6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b'
+```
+### uuid.v1([options[, buffer[, offset]]])
+Create an RFC version 1 (timestamp) UUID
+|  |  |
+| --- | --- |
+| [`options`] | `Object` with one or more of the following properties: |
+| [`options.node` ] | RFC "node" field as an `Array[6]` of byte values (per 4.1.6) |
+| [`options.clockseq`] | RFC "clock sequence" as a `Number` between 0 - 0x3fff |
+| [`options.msecs`] | RFC "timestamp" field (`Number` of milliseconds, unix epoch) |
+| [`options.nsecs`] | RFC "timestamp" field (`Number` of nanseconds to add to `msecs`, should be 0-10,000) |
+| [`options.random`] | `Array` of 16 random bytes (0-255) |
+| [`options.rng`] | Alternative to `options.random`, a `Function` that returns an `Array` of 16 random bytes (0-255) |
+| [`buffer`] | `Array \| Buffer` If specified, uuid will be written here in byte-form, starting at `offset` |
+| [`offset` = 0] | `Number` Index to start writing UUID bytes in `buffer` |
+| _returns_ | UUID `String` if no `buffer` is specified, otherwise returns `buffer` |
+| _throws_ | `Error` if more than 10M UUIDs/sec are requested |
+### Version 1
+```javascript
+const uuidv1 = require('uuid/v1');
+// Incantations
+uuidv1();
+uuidv1(options);
+uuidv1(options, buffer, offset);
+```
+Generate and return a RFC4122 v1 (timestamp-based) UUID.
+* `options` - (Object) Optional uuid state to apply. Properties may include:
+  * `node` - (Array) Node id as Array of 6 bytes (per 4.1.6). Default: Randomly generated ID.  See note 1.
+  * `clockseq` - (Number between 0 - 0x3fff) RFC clock sequence.  Default: An internally maintained clockseq is used.
+  * `msecs` - (Number) Time in milliseconds since unix Epoch.  Default: The current time is used.
+  * `nsecs` - (Number between 0-9999) additional time, in 100-nanosecond units. Ignored if `msecs` is unspecified. Default: internal uuid counter is used, as per 4.2.1.2.
+* `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written.
+* `offset` - (Number) Starting index in `buffer` at which to begin writing.
+Returns `buffer`, if specified, otherwise the string form of the UUID
 Note: The default [node id](https://tools.ietf.org/html/rfc4122#section-4.1.6) (the last 12 digits in the UUID) is generated once, randomly, on process startup, and then remains unchanged for the duration of the process.
+Note: `options.random` and `options.rng` are only meaningful on the very first call to `v1()`, where they may be passed to initialize the internal `node` and `clockseq` fields.
+Example:
+```javascript
+import { v1 as uuidv1 } from 'uuid';
+uuidv1(); // ⇨ '2c5ea4c0-4067-11e9-8bad-9b1deb4d3b7d'
+```
+Example using `options`:
+```javascript
+import { v1 as uuidv1 } from 'uuid';
+Example: Generate string UUID with fully-specified options
+```javascript
 const v1options = {
   node: [0x01, 0x23, 0x45, 0x67, 0x89, 0xab],
   clockseq: 0x1234,
   msecs: new Date('2011-11-01').getTime(),
   nsecs: 5678,
+  nsecs: 5678
 };
 uuidv1(v1options); // ⇨ '710b962e-041c-11e1-9234-0123456789ab'
+```
+### uuid.v3(name, namespace[, buffer[, offset]])
+Create an RFC version 3 (namespace w/ MD5) UUID
+API is identical to `v5()`, but uses "v3" instead.
+&#x26a0;&#xfe0f; Note: Per the RFC, "_If backward compatibility is not an issue, SHA-1 [Version 5] is preferred_."
+### uuid.v4([options[, buffer[, offset]]])
+Create an RFC version 4 (random) UUID
+|  |  |
+| --- | --- |
+| [`options`] | `Object` with one or more of the following properties: |
+| [`options.random`] | `Array` of 16 random bytes (0-255) |
+| [`options.rng`] | Alternative to `options.random`, a `Function` that returns an `Array` of 16 random bytes (0-255) |
+| [`buffer`] | `Array \| Buffer` If specified, uuid will be written here in byte-form, starting at `offset` |
+| [`offset` = 0] | `Number` Index to start writing UUID bytes in `buffer` |
+| _returns_ | UUID `String` if no `buffer` is specified, otherwise returns `buffer` |
+```
+Example: In-place generation of two binary IDs
+```javascript
+// Generate two ids in an array
+const arr = new Array();
+uuidv1(null, arr, 0);  // ⇨
+  // [
+  //    44,  94, 164, 192,  64, 103,
+  //    17, 233, 146,  52, 155,  29,
+  //   235,  77,  59, 125
+  // ]
+uuidv1(null, arr, 16); // ⇨
+  // [
+  //    44, 94, 164, 192,  64, 103, 17, 233,
+  //   146, 52, 155,  29, 235,  77, 59, 125,
+  //    44, 94, 164, 193,  64, 103, 17, 233,
+  //   146, 52, 155,  29, 235,  77, 59, 125
+  // ]
+```
+### Version 3
+```javascript
+const uuidv3 = require('uuid/v3');
+// Incantations
+uuidv3(name, namespace);
+uuidv3(name, namespace, buffer);
+uuidv3(name, namespace, buffer, offset);
+```
+Generate and return a RFC4122 v3 UUID.
+* `name` - (String | Array[]) "name" to create UUID with
+* `namespace` - (String | Array[]) "namespace" UUID either as a String or Array[16] of byte values
+* `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written.
+* `offset` - (Number) Starting index in `buffer` at which to begin writing. Default = 0
+Returns `buffer`, if specified, otherwise the string form of the UUID
 Example:
 ```javascript
+import { v4 as uuidv4 } from 'uuid';
+uuidv4(); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
+```
+Example using predefined `random` values:
+```javascript
+import { v4 as uuidv4 } from 'uuid';
+uuidv3('hello world', MY_NAMESPACE);  // ⇨ '042ffd34-d989-321c-ad06-f60826172424'
+```
+### Version 4
+```javascript
+const uuidv4 = require('uuid/v4')
+// Incantations
+uuidv4();
+uuidv4(options);
+uuidv4(options, buffer, offset);
+```
+Generate and return a RFC4122 v4 UUID.
+* `options` - (Object) Optional uuid state to apply. Properties may include:
+  * `random` - (Number[16]) Array of 16 numbers (0-255) to use in place of randomly generated values
+  * `rng` - (Function) Random # generator function that returns an Array[16] of byte values (0-255)
+* `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written.
+* `offset` - (Number) Starting index in `buffer` at which to begin writing.
+Returns `buffer`, if specified, otherwise the string form of the UUID
+Example: Generate string UUID with predefined `random` values
+```javascript
 const v4options = {
   random: [
+x10,
+x91,
+x56,
+xbe,
+xc4,
+xfb,
+xc1,
+xea,
+x71,
+xb4,
+xef,
+xe1,
+x67,
+x1c,
+x58,
+x36,
+  ],
+x10, 0x91, 0x56, 0xbe, 0xc4, 0xfb, 0xc1, 0xea,
+x71, 0xb4, 0xef, 0xe1, 0x67, 0x1c, 0x58, 0x36
+  ]
 };
 uuidv4(v4options); // ⇨ '109156be-c4fb-41ea-b1b4-efe1671c5836'
+```
+### uuid.v5(name, namespace[, buffer[, offset]])
+Create an RFC version 5 (namespace w/ SHA-1) UUID
+|  |  |
+| --- | --- |
+| `name` | `String \| Array` |
+| `namespace` | `String \| Array[16]` Namespace UUID |
+| [`buffer`] | `Array \| Buffer` If specified, uuid will be written here in byte-form, starting at `offset` |
+| [`offset` = 0] | `Number` Index to start writing UUID bytes in `buffer` |
+| _returns_ | UUID `String` if no `buffer` is specified, otherwise returns `buffer` |
+Note: The RFC `DNS` and `URL` namespaces are available as `v5.DNS` and `v5.URL`.
+Example with custom namespace:
+```javascript
+import { v5 as uuidv5 } from 'uuid';
+// Define a custom namespace.  Readers, create your own using something like
+// https://www.uuidgenerator.net/
+const MY_NAMESPACE = '1b671a64-40d5-491e-99b0-da01ff1f3341';
+uuidv5('Hello, World!', MY_NAMESPACE); // ⇨ '630eb68f-e0fa-5ecc-887a-7c7a62614681'
+```
+Example with RFC `URL` namespace:
+```javascript
+import { v5 as uuidv5 } from 'uuid';
+uuidv5('https://www.w3.org/', uuidv5.URL); // ⇨ 'c106a26a-21bb-5538-8bf2-57095d1976c1'
+```
+### uuid.validate(str)
+Test a string to see if it is a valid UUID
+|           |                                                     |
+| --------- | --------------------------------------------------- |
+| `str`     | `String` to validate                                |
+| _returns_ | `true` if string is a valid UUID, `false` otherwise |
+```
+Example: Generate two IDs in a single buffer
+```javascript
+const buffer = new Array();
+uuidv4(null, buffer, 0);  // ⇨
+  // [
+  //   155, 29, 235,  77,  59,
+  //   125, 75, 173, 155, 221,
+  //    43, 13, 123,  61, 203,
+  //   109
+  // ]
+uuidv4(null, buffer, 16); // ⇨
+  // [
+  //   155,  29, 235,  77,  59, 125,  75, 173,
+  //   155, 221,  43,  13, 123,  61, 203, 109,
+  //    27, 157, 107, 205, 187, 253,  75,  45,
+  //   155,  93, 171, 141, 251, 189,  75, 237
+  // ]
+```
+### Version 5
+```javascript
+const uuidv5 = require('uuid/v5');
+// Incantations
+uuidv5(name, namespace);
+uuidv5(name, namespace, buffer);
+uuidv5(name, namespace, buffer, offset);
+```
+Generate and return a RFC4122 v5 UUID.
+* `name` - (String | Array[]) "name" to create UUID with
+* `namespace` - (String | Array[]) "namespace" UUID either as a String or Array[16] of byte values
+* `buffer` - (Array | Buffer) Array or buffer where UUID bytes are to be written.
+* `offset` - (Number) Starting index in `buffer` at which to begin writing. Default = 0
+Returns `buffer`, if specified, otherwise the string form of the UUID
 Example:
 ```javascript
+import { validate as uuidValidate } from 'uuid';
+uuidValidate('not a UUID'); // ⇨ false
+uuidValidate('6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b'); // ⇨ true
+```
+Using `validate` and `version` together it is possible to do per-version validation, e.g. validate for only v4 UUIds.
+```javascript
+import { version as uuidVersion } from 'uuid';
+import { validate as uuidValidate } from 'uuid';
+function uuidValidateV4(uuid) {
+  return uuidValidate(uuid) && uuidVersion(uuid) === 4;
+}
+const v1Uuid = 'd9428888-122b-11e1-b85c-61cd3cbb3210';
+const v4Uuid = '109156be-c4fb-41ea-b1b4-efe1671c5836';
+uuidValidateV4(v4Uuid); // ⇨ true
+uuidValidateV4(v1Uuid); // ⇨ false
+```
+### uuid.version(str)
+Detect RFC version of a UUID
+|           |                                          |
+| --------- | ---------------------------------------- |
+| `str`     | A valid UUID `String`                    |
+| _returns_ | `Number` The RFC version of the UUID     |
+| _throws_  | `TypeError` if `str` is not a valid UUID |
+Example:
+```javascript
+import { version as uuidVersion } from 'uuid';
+uuidVersion('45637ec4-c85f-11ea-87d0-0242ac130003'); // ⇨ 1
+uuidVersion('6ec0bd7f-11c0-43da-975e-2a8ad9ebae0b'); // ⇨ 4
+uuidv5('hello world', MY_NAMESPACE);  // ⇨ '9f282611-e0fd-5650-8953-89c8e342da0b'
 ```
 ## Command Line
 UUIDs can be generated from the command line using `uuid`.
+UUIDs can be generated from the command line with the `uuid` command.
 ```shell
 $ uuid
 ddeb27fb-d9a0-4624-be4d-4615062daed4
+```
+The default is to generate version 4 UUIDS, however the other versions are supported. Type `uuid --help` for details:
+$ uuid v1
+d37060-d446-11e7-a9fa-7bdae751ebe1
+```
+Type `uuid --help` for usage details
+## Testing
 ```shell
+$ uuid --help
+Usage:
+  uuid
+  uuid v1
+  uuid v3 <name> <namespace uuid>
+  uuid v4
+  uuid v5 <name> <namespace uuid>
+  uuid --help
+Note: <namespace uuid> may be "URL" or "DNS" to use the corresponding UUIDs
+defined by RFC4122
+```
+## ECMAScript Modules
+This library comes with [ECMAScript Modules](https://www.ecma-international.org/ecma-262/6.0/#sec-modules) (ESM) support for Node.js versions that support it ([example](./examples/node-esmodules/)) as well as bundlers like [rollup.js](https://rollupjs.org/guide/en/#tree-shaking) ([example](./examples/browser-rollup/)) and [webpack](https://webpack.js.org/guides/tree-shaking/) ([example](./examples/browser-webpack/)) (targeting both, Node.js and browser environments).
+```javascript
+import { v4 as uuidv4 } from 'uuid';
+uuidv4(); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
+```
+To run the examples you must first create a dist build of this library in the module root:
+```shell
+npm run build
+```
+## CDN Builds
+### ECMAScript Modules
+To load this module directly into modern browsers that [support loading ECMAScript Modules](https://caniuse.com/#feat=es6-module) you can make use of [jspm](https://jspm.org/):
+```html
+<script type="module">
+  import { v4 as uuidv4 } from 'https://jspm.dev/uuid';
+  console.log(uuidv4()); // ⇨ '1b9d6bcd-bbfd-4b2d-9b5d-ab8dfbbd4bed'
+</script>
+```
+### UMD
+To load this module directly into older browsers you can use the [UMD (Universal Module Definition)](https://github.com/umdjs/umd) builds from any of the following CDNs:
+**Using [UNPKG](https://unpkg.com/uuid@latest/dist/umd/)**:
+```html
+<script src="https://unpkg.com/uuid@latest/dist/umd/uuidv4.min.js"></script>
+```
+**Using [jsDelivr](https://cdn.jsdelivr.net/npm/uuid@latest/dist/umd/)**:
+```html
+<script src="https://cdn.jsdelivr.net/npm/uuid@latest/dist/umd/uuidv4.min.js"></script>
+```
+**Using [cdnjs](https://cdnjs.com/libraries/uuid)**:
+```html
+<script src="https://cdnjs.cloudflare.com/ajax/libs/uuid/8.1.0/uuidv4.min.js"></script>
+```
+These CDNs all provide the same [`uuidv4()`](#uuidv4options-buffer-offset) method:
+```html
+<script>
+  uuidv4(); // ⇨ '55af1e37-0734-46d8-b070-a1e42e4fc392'
+</script>
+```
+Methods for the other algorithms ([`uuidv1()`](#uuidv1options-buffer-offset), [`uuidv3()`](#uuidv3name-namespace-buffer-offset) and [`uuidv5()`](#uuidv5name-namespace-buffer-offset)) are available from the files `uuidv1.min.js`, `uuidv3.min.js` and `uuidv5.min.js` respectively.
+## "getRandomValues() not supported"
+This error occurs in environments where the standard [`crypto.getRandomValues()`](https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues) API is not supported. This issue can be resolved by adding an appropriate polyfill:
+### React Native / Expo
+. Install [`react-native-get-random-values`](https://github.com/LinusU/react-native-get-random-values#readme)
+. Import it _before_ `uuid`. Since `uuid` might also appear as a transitive dependency of some other imports it's safest to just import `react-native-get-random-values` as the very first thing in your entry point:
+```javascript
+import 'react-native-get-random-values';
+import { v4 as uuidv4 } from 'uuid';
+```
+Note: If you are using Expo, you must be using at least `react-native-get-random-values@1.5.0` and `expo@39.0.0`.
+### Web Workers / Service Workers (Edge <= 18)
+[In Edge <= 18, Web Crypto is not supported in Web Workers or Service Workers](https://caniuse.com/#feat=cryptography) and we are not aware of a polyfill (let us know if you find one, please).
+## Upgrading From `uuid@7.x`
+### Only Named Exports Supported When Using with Node.js ESM
+`uuid@7.x` did not come with native ECMAScript Module (ESM) support for Node.js. Importing it in Node.js ESM consequently imported the CommonJS source with a default export. This library now comes with true Node.js ESM support and only provides named exports.
+Instead of doing:
+```javascript
+import uuid from 'uuid';
+uuid.v4();
+```
+you will now have to use the named exports:
+```javascript
+import { v4 as uuidv4 } from 'uuid';
+uuidv4();
+```
+### Deep Requires No Longer Supported
+Deep requires like `require('uuid/v4')` [which have been deprecated in `uuid@7.x`](#deep-requires-now-deprecated) are no longer supported.
+## Upgrading From `uuid@3.x`
+"_Wait... what happened to `uuid@4.x` - `uuid@6.x`?!?_"
+In order to avoid confusion with RFC [version 4](#uuidv4options-buffer-offset) and [version 5](#uuidv5name-namespace-buffer-offset) UUIDs, and a possible [version 6](http://gh.peabody.io/uuidv6/), releases 4 thru 6 of this module have been skipped.
+### Deep Requires Now Deprecated
+`uuid@3.x` encouraged the use of deep requires to minimize the bundle size of browser builds:
+```javascript
+const uuidv4 = require('uuid/v4'); // <== NOW DEPRECATED!
+uuidv4();
+```
+As of `uuid@7.x` this library now provides ECMAScript modules builds, which allow packagers like Webpack and Rollup to do "tree-shaking" to remove dead code. Instead, use the `import` syntax:
+```javascript
+import { v4 as uuidv4 } from 'uuid';
+uuidv4();
+```
+... or for CommonJS:
+```javascript
+const { v4: uuidv4 } = require('uuid');
+uuidv4();
+```
+### Default Export Removed
+`uuid@3.x` was exporting the Version 4 UUID method as a default export:
+```javascript
+const uuid = require('uuid'); // <== REMOVED!
+```
+This usage pattern was already discouraged in `uuid@3.x` and has been removed in `uuid@7.x`.
+npm test
+```
 ----

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