Remove optional type from the validation context parameter

[adrianolek]

What version of Ajv are you using? Does the issue happen if you use the latest version?

8.6.2, happens in the latest version

Your typescript code

import { DataValidateFunction } from "ajv/dist/types";

ajv.addKeyword({
  keyword: "test",
  schema: false,
  validate: function (_data: any, dataCxt) {
    dataCxt.rootData;
    return true;
  } as DataValidateFunction
});

Typescript compiler error messages

(7,22): TS2532: Object is possibly `undefined`.

It means that the dataCxt object is possibly 'undefined'.

Describe the change that should be made to address the issue?

Remove the optional ? operator from the dataCxt parameter in ValidateFunction and SchemaValidateFunction interface types.

I've checked the generated code, and the validation context object is always passed to the validation function. Also the codegen validateFunction seems to always include the validation context (although I'm not familiar with codegen itself, so I may be wrong here).

Are you going to resolve the issue?

Yes. The PR removes the optional operator from dataCxt and renames DataValidationCxt to ValidationCxt & dataCxt to valCxt to match the codegen function.

[epoberezkin]

I think it is most likely a breaking change, and I do think it has to be optional... But in any case, please try to make the tests pass - I've fixed the typescript issue that was breaking the compilation.