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TypeScript nowadays is the hottest trending JavaScript dialect and is becoming more and more popular in the community. We all know, the TypeScript key feature is the introduction of static typing in weakly-typed JavaScript. But that’s not for free! Let's recap - why do we need types? What are the advantages and disadvantages of using TypeScript? What is its cost and what’s the impact of its adoption? And then the trick: get the benefits of TypeScript without using it!