Bug in conditions `if/then`.

[izosimov]

What version of Ajv are you using? Does the issue happen if you use the latest version?
version: 8.17.1 (latest)

Ajv options object

const ajv = new Ajv({
  strict: true
})

JSON Schema

const schema = {
  type: 'object',
  properties: {
    name: {
      type: 'string'
    },
    age: {
      type: 'number'
    }
  },
  required: [ 'name' ],
  if: {
    properties: {
      name: { type: 'string', minLength: 3 }
    }
  },
  then: {
    properties: {
      age: { type: 'number', minimum: 10 }
    },
    required: [ 'age' ]
  }
}

Sample data

const data = {
  name: undefined,
  age: undefined
}

Validation result, data AFTER validation, error messages

[
  {
    instancePath: '',
    keyword: 'required',
    message: 'must have required property `age`',
    params: {
      missingProperty: 'age'
    },
    schemaPath: '#/then/required'
  }
]

What results did you expect?

[
  {
    instancePath: '',
    keyword: 'required',
    message: 'must have required property `name`',
    params: {
      missingProperty: 'name'
    },
    schemaPath: '#/then/required'
  }
]

So, I'm trying validate the data by this schema. And faced with unexpected behavior. In this example I've got error with age field instead of name. So I expect that name field at first level in object must be validated before age.
By the way, in another example, if I've got an empty string in name field, I have a valid data.

I've tried to change the schema like this using allOf:

const schema = {
  type: 'object',
  properties: {
    name: {
      type: 'string'
    },
    age: {
      type: 'number'
    }
  },
  required: [ 'name' ],
  allOf: [
    {
      if: {
        properties: {
          name: { type: 'string', minLength: 3 }
        }
      },
      then: {
        properties: {
          age: { type: 'number', minimum: 10 }
        },
        required: [ 'age' ]
      }
    }
  ]
}

Same result.

Are you going to resolve the issue?
I'm asking your comment and advice first of all.