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Why do you want TypeScript to check types at run time? Integration with other JavaScript code?

• mjibson 12y ago
  Validation of JSON responses is the big win.
  • pspeter3 12y ago
    Ah that would be cool. We actually code generate interfaces for our responses which is really helpful.
    • recursive 12y ago
      Typelite is good for this.
• programminggeek 12y ago
  I am a big fan of design by contract. (http://retromocha.com/obvious/ http://retromocha.com/obvious/) I don't trust user input in any form, including the database. So, while a system like TypeScript that checks types in the code is fantastic, it doesn't check types in the input, which is how a lot of problems happen in the first place. Seriously, just import one legacy dataset into your system or have to work with some JSON api, and all of a sudden you can't trust that the data is valid, correctly typed, or even sane. Doing proper validation of types and data integrity at any input point can save you a whole category of sadly common bugs. That includes data coming out of any data source you use, like a database. Runtime type checking is another tool to make validated data a common, sane thing.