# [`oro:enumeration`](/runtime/docs/javascript/enumeration/)

[`oro:enumeration`](/runtime/docs/javascript/enumeration/) is a small typed-set helper used throughout the runtime surface.

## Examples

Use `Enumeration` when you want a typed, readable set of allowed values:

```js
import Enumeration from 'oro:enumeration'

const states = new Enumeration(['draft', 'ready', 'shipped'])

console.log(states.has('ready'))
console.log([...states])
```

## API reference

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### Module specifiers

```text
oro:enumeration
```

### TypeScript declarations

These declarations are generated from the runtime's published TypeScript surface.

#### [`oro:enumeration`](/runtime/docs/javascript/enumeration/)

```ts
declare module "oro:enumeration" {
    /**
     * @module enumeration
     * This module provides a data structure for enumerated unique values.
     */
    /**
     * A container for enumerated values.
     */
    export class Enumeration extends Set<any> {
        /**
         * Creates an `Enumeration` instance from arguments.
         * @param {...any} values
         * @return {Enumeration}
         */
        static from(...values: any[]): Enumeration;
        /**
         * `Enumeration` class constructor.
         * @param {any[]} values
         * @param {object=} [options = {}]
         * @param {number=} [options.start = 0]
         */
        constructor(values: any[], options?: object | undefined);
        /**
         * @type {number}
         */
        get length(): number;
        /**
         * Returns `true` if enumeration contains `value`. An alias
         * for `Set.prototype.has`.
         * @return {boolean}
         */
        contains(value: any): boolean;
        /**
         * @ignore
         */
        add(): void;
        /**
         * @ignore
         */
        delete(): void;
        /**
         * JSON represenation of a `Enumeration` instance.
         * @ignore
         * @return {string[]}
         */
        toJSON(): string[];
        /**
         * Internal inspect function.
         * @ignore
         * @return {LanguageQueryResult}
         */
        inspect(): LanguageQueryResult;
    }
    export default Enumeration;
}
```

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## See also

- [JavaScript APIs overview](/runtime/docs/javascript/overview/)
- [All module specifiers](/runtime/docs/javascript/all-modules/)