Either with Buffer Type

[Ken-LiuL]

when use Buffer type in S.either, it will throw type unsupported error, if type check is open

[davidchambers]

You'll need to define a Buffer type, then create a Sanctuary module with a custom environment which includes that type:

const {create, env} = require ('sanctuary');
const $ = require ('sanctuary-def');

//    BufferType :: Type
const BufferType = $.NullaryType
  ('my-package/Buffer')
  ('https://my-package.org/#Buffer')
  (Buffer.isBuffer);

const S = create ({checkTypes: true, env: env.concat ([BufferType])});

Let me know if this approach works for you, @Charles-Lau-.

[Ken-LiuL]

it seems I need to define this for each types that are not defined in 'sanctuary-def', this works after I define all of them

[davidchambers]

That's right, @Charles-Lau-. If you believe some of your type definitions are general enough to warrant inclusion in $.env, please raise an issue.

[jceb]

@davidchambers This is really useful when using sanctuary with NodeJS. Would love to see it become part of $.env. What's necessary to get it in there?