Generating typescript declaration files from javascript

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JavaScript doesn’t always contain enough type information for the TypeScript compiler to infer the structures in your code – so automatically generating a definition based on JavaScript is rarely an option.

There are instructions on how to write them from scratch here:

https://www.stevefenton.co.uk/2013/01/complex-typescript-definitions-made-easy/

But there is one trick that might work (it only works in a limited set of cases).

If you paste the JavaScript into a new TypeScript file, fix any trivial errors you may get and compile it using the definition flag, it may be able to get you a file that would at least be a starting point.

tsc --declaration js.ts

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