When you are trying to migrate from JavaScript to TypeScript you will have an error noImplicitAny when you variable or parameter will not have assigned type.

There are to two bad solutions

Quick and dirty

To avoid that options in quick and dirty way you can:

• Disable noImplicitAny in tsconfig.json, but I don’t recommend it to you because
  • You are migrating to typescript to have types. Am I right?
  • You will have to do this in the future.
• Use any on any place where type is required, but:
  • There is no value for typescript if you use any everywhere
  • You will be not able to distinguish:
    • where any is used consciously
    • where any is used, just to build the application

Slow and clean

• Create a type for every variable and parameter, but:
  • It will take you a lot of time
  • It is not required if you don’t have cooperate with that code
  • You will be tired, because it is very boring job

The best solution to avoid noImplicitAny error

1. Create a file fakeAny.ts with content:

   export type fakeAny = any
   

2. In any place where you have noImplicitAny use fakeAny instead od any
3. Then your application will be build and you will have a huge amount of benefits

Benefits of using fakeĄny instead of any

• You can continue your work almost immediately.
• You know where you want to use any and where it is only temporary placeholder for TS compiler
• You can find all fakeAny occurrences easily. So you will know what parts of the code are not migrated to TypeScript completely.
  • Or you can remove fakeAny.ts to check how many errors you have. It is useful when you are on the end of migrating.

A small request to you :)

If you think you will use it or you have different approach for the same problem. Let me know and leave a comment.

Thank you