Commits on May 26, 2023

1. feat: provide current values as context to yup validation by default …

   Yup by default only allows for cross-field validation within the
   same field object. This is not that useful in most scenarios because
   a sufficiently-complex form will have several `yup.object()` in the
   schema.
   
   ```ts
   const deepNestedSchema = Yup.object({
     object: Yup.object({
       nestedField: Yup.number().required(),
     }),
     object2: Yup.object({
       // this doesn't work because `object.nestedField` is outside of `object2`
       nestedFieldWithRef: Yup.number().min(0).max(Yup.ref('object.nestedField')),
     }),
   });
   ```
   
   However, Yup offers something called `context` which can operate across
   the entire schema when using a $ prefix:
   
   ```ts
   const deepNestedSchema = Yup.object({
     object: Yup.object({
       nestedField: Yup.number().required(),
     }),
     object2: Yup.object({
       // this works because of the "context" feature, enabled by $ prefix
       nestedFieldWithRef: Yup.number().min(0).max(Yup.ref('$object.nestedField')),
     }),
   });
   ```
   
   With this change, you may now validate against any field in the entire schema,
   regardless of position when using the $ prefix.

   

   quantizor committed May 26, 2023
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