Support for transform

[tkamstra]

It is known in Yup that type number has weird requirements when validating a number input that is blank. A common fix is to add the following code: .transform = (_, val) => (val !== '' ? Number(val) : null)

Is there any way to add transform support?

edit:
tried adding a typeHandler, but no avail

[tonthon]

I did it this way :

import {YupNumber, createNumberGuard} from 'schema-to-yup/src/types/number/index.js'

import  * as Yup from 'yup'

class MyCustomNumberHandler extends YupNumber {
  get validatorInstance(){
    let result = this.validator.number()
    const nullable = this.value.nullable === true || this.value.null === true;
    if (nullable){
      result = result.transform(
        (value, originalValue) => (
          ['', undefined, false, NaN, null].includes(originalValue)
          ? null
          : Number(String(originalValue).replace(/,/g, '.'))
        )
      )
    }
  }
  static create(obj){
    return new MyCustomNumberHandler(obj);
  }
  static schemaEntryFor(obj) {
    return MyCustomNumberHandler.create(obj).createSchemaEntry();
  }
}

const defaultConfig = {
  logging: false,
  enable: { log: true, warn: true, error: true },
  typeHandlers: {
    number: (obj, config={}) =>  createNumberGuard(obj, config).verify() && MyCustomNumberHandler.create(obj).createSchemaEntry()
  }
}

Edit : Added to support for initial null values
Edit 2 : Added call to NumberGuard