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Provide an array of allowed groups and validate it \nagainst a single intersection of a given group. Additionally, define an array of singletons and verify the input array \noccurs only once.\n\n## Features\n\n- Validate groups\n- Validate singletons\n\n## Installation\n\n```js\nnpm install joi-intersection --save\n```\n\n## API\n\n### `groups([[group: string]])`\n\nA group contains array of strings. \n\n| Parameter             | Type              | Description                 |\n|-----------------------|-------------------|-----------------------------|\n| `group`               | `[group: string]` | Allowed intersection groups |\n\n### `singleton([singleton: string])`\n\nSingletons contain arrays of strings.\n\n| Parameter             | Type                    | Description                 |\n|-----------------------|-------------------------|-----------------------------|\n| `singleton`           | `[singleton: string]`   | Allowed singleton           |\n\n## Usage\n\n### Extend Joi\n\nYou have to extend Joi first, then use it like other validation rules. You can also chain both rules.\n\n```js\nimport JoiBase from 'joi'\nimport JoiIntersection from 'joi-intersection'\nimport * as assert from 'assert'\n\nconst Joi = JoiBase.extend(JoiIntersection)\n```\n\n### Groups\n\n```js\nconst schema = Joi.array().groups([\n  ['Bob', 'Alex', 'Peter'],\n  ['Jack', 'Mike']\n])\n\nJoi.validate(['Bob', 'Alex'], schema, error =\u003e assert.ok(error, null))\nJoi.validate(['Bob', 'Jack'], schema, error =\u003e assert.notEqual(error, null))\n```\n\n### Singleton\n\n```js\nconst schema = Joi.array().singleton(['Bob', 'Alex', 'Peter'])\n\nJoi.validate(['Bob'], schema, error =\u003e assert.ok(error, null))\nJoi.validate(['Bob', 'Bob'], schema, error =\u003e assert.notEqual(error, null))\n```\n\n## Author\n\n[Julian Claus](https://www.julian-claus.de) and contributors.\n\n## License\n\nMIT\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fndabap%2Fjoi-intersection","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fndabap%2Fjoi-intersection","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fndabap%2Fjoi-intersection/lists"}