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Steve Fenton

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Why TypeScript Interfaces Can Extend Classes

When I originally discovered that TypeScript interfaces can extend classes, I thought it was novel but lacking in real-world usages. At the time, I had a solution with no problem so for the sake of argument I tried to imagine what the problem might be. Perhaps you could point an interface at a third party class to ensure that your swappable implementation stayed in step with any changes to the original. Not a compelling reason to use this feature by any means.

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