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/**
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* @flow
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*/
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interface IHasLength {
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length: number;
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}
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var lengthTest1: IHasLength = [];
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var lengthTest2: IHasLength = 'hello';
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var lengthTest3: IHasLength = 123; // number doesn't have length
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var lengthTest4: IHasLength = true; // bool doesn't have length
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