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39 lines
645 B
TypeScript
39 lines
645 B
TypeScript
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/**
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Convert a value to an array.
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_Supplying `null` or `undefined` results in an empty array._
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@example
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```
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import arrify = require('arrify');
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arrify('🦄');
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//=> ['🦄']
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arrify(['🦄']);
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//=> ['🦄']
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arrify(new Set(['🦄']));
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//=> ['🦄']
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arrify(null);
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//=> []
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arrify(undefined);
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//=> []
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```
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*/
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declare function arrify<ValueType>(
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value: ValueType
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): ValueType extends (null | undefined)
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? []
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: ValueType extends string
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? [string]
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: ValueType extends ReadonlyArray<unknown> // TODO: Use 'readonly unknown[]' in the next major version
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? ValueType
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: ValueType extends Iterable<infer T>
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? T[]
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: [ValueType];
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export = arrify;
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