Readonly arrays not handled properly

[LinusU]

What version of Ajv are you using? Does the issue happen if you use the latest version? 7.1.0/master, yes

Ajv options object

{}

JSON Schema

{
  "additionalProperties": false,
  "properties": {
    "items": { "type": "array" },
  },
  "required": ["items"],
  "type": "object"
}

Sample data

n/a

Your code

interface TransactionInput {
  items: readonly { count: number, productId: string }[]
}

const transactionInputValidator = ajv.compile<TransactionInput>({
  additionalProperties: false,
  properties: {
    items: { type: 'array' }, // <--- Error: TS wants this to be "object"
  },
  required: ['items'],
  type: 'object'
})

Validation result, data AFTER validation, error messages

n/a

What results did you expect?

TypeScript to allow it to be an array

Are you going to resolve the issue?

Yes

[epoberezkin]

merged - thank you!