Statically typed Javascript : Why and How

In the last months I have found good experiences using Statically typed Javascript. For example, using React with Typescript. It helps a lot to build a robust Web development, with statically typed Javascript support, ready for a complex and enterprise-level projects.

TypeScript is maintained by Microsoft, but it’s not the only option for statically typed Javascript. Flow, from Facebook and Dart from Google are similar options among a long list of implementations.

Why so many “big companies” are doing really big efforts to introduce static typing in Javascript development in the last years?

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