https://github.com/jaredly/example-reason-codemod

https://github.com/jaredly/example-reason-codemod

Last synced: 17 days ago
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• Host: GitHub
• URL: https://github.com/jaredly/example-reason-codemod
• Owner: jaredly
• Created: 2018-09-25T06:57:01.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2018-09-25T06:57:25.000Z (about 6 years ago)
• Last Synced: 2024-10-13T19:07:23.484Z (about 1 month ago)
• Language: OCaml
• Size: 17.6 KB
• Stars: 3
• Watchers: 2
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: Readme.md

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README

        
# Example Codemod

Here's an example of a type-driven codemod!

It finds functions that have a return type of `Belt.Result.t(int, string)`, and wraps the error payloads with `Unspecified`.

So, for the file:

```reason

open Result;

let changeMe = (a, b, c) => Error("hello");

let nonCollapsible = something =>

  if (something > 2) {

    Result.Ok(something);

  } else {

    Error("bad news");

  };

```

It rewrites as:

```reason

open Result;

let changeMe = (a, b, c) => Error("hello");

let nonCollapsible = something =>

  if (something > 2) {

    Result.Ok(something);

  } else {

    Error(Unspecified("bad news"));

  };

```

Note that the first `Error()` was not wrapped, because we specified that the `'ok` type had to be `int`. We could have left the `ok` type argument blank, and it would have picked that one up too.