91 lines
3.2 KiB
TypeScript
91 lines
3.2 KiB
TypeScript
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import {type MergeExclusive} from 'type-fest';
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type BaseOptions = {
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/**
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Length of the returned string.
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Must be a non-negative integer.
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This is the number of characters, so a string generated from a `characters` set with characters outside the [Basic Multilingual Plane](https://en.wikipedia.org/wiki/Plane_(Unicode)#Basic_Multilingual_Plane), like emoji, has a larger `.length` than this.
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*/
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length: number;
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};
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type TypeOption = {
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/**
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Use only characters from a predefined set of allowed characters.
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Cannot be set at the same time as the `characters` option.
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@default 'hex'
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The `distinguishable` set contains only uppercase characters that are not easily confused: `CDEHKMPRTUWXY012458`. It can be useful if you need to print out a short string that you'd like users to read and type back in with minimal errors. For example, reading a code off of a screen that needs to be typed into a phone to connect two devices.
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The `ascii-printable` set contains all [printable ASCII characters](https://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters) except the space: ``!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~`` Useful for generating passwords where all possible ASCII characters should be used.
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The `alphanumeric` set contains uppercase letters, lowercase letters, and digits: `ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789`. Useful for generating [nonce](https://developer.mozilla.org/en-US/docs/Web/API/HTMLOrForeignElement/nonce) values.
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@example
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```
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cryptoRandomString({length: 10});
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//=> '87fc70e2b9'
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cryptoRandomString({length: 10, type: 'base64'});
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//=> 'mhsX7xmIv/'
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cryptoRandomString({length: 10, type: 'url-safe'});
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//=> 'VEjfNW3Yej'
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cryptoRandomString({length: 10, type: 'numeric'});
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//=> '8314659141'
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cryptoRandomString({length: 6, type: 'distinguishable'});
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//=> 'CDEHKM'
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cryptoRandomString({length: 10, type: 'ascii-printable'});
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//=> '`#Rt8$IK>B'
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cryptoRandomString({length: 10, type: 'alphanumeric'});
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//=> 'DMuKL8YtE7'
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```
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*/
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type?: 'hex' | 'base64' | 'url-safe' | 'numeric' | 'distinguishable' | 'ascii-printable' | 'alphanumeric';
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};
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type CharactersOption = {
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/**
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Use only characters from a custom set of allowed characters.
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Cannot be set at the same time as the `type` option.
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Each character is picked with equal probability, so repeating a character in the set makes it more likely to be picked. The length limits count Unicode characters, not UTF-16 code units, so characters outside the [Basic Multilingual Plane](https://en.wikipedia.org/wiki/Plane_(Unicode)#Basic_Multilingual_Plane), like emoji, are handled correctly.
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Minimum length: `1`
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Maximum length: `65536`
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@example
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```
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cryptoRandomString({length: 10, characters: '0123456789'});
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//=> '8796225811'
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```
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*/
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characters?: string;
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};
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export type Options = BaseOptions & MergeExclusive<TypeOption, CharactersOption>;
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/**
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Generate a [cryptographically strong](https://en.wikipedia.org/wiki/Strong_cryptography) random string.
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@returns A randomized string.
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@example
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```
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import cryptoRandomString from 'crypto-random-string';
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cryptoRandomString({length: 10});
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//=> '2cf05d94db'
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```
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*/
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export default function cryptoRandomString(options: Options): string;
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