What version of Ajv you are you using?

8.11.0

What problem do you want to solve?

I'd like to validate JSON schema extracted from OpenAPI 3.0 that includes discriminator.mapping. Currently having it will make AJV throw a unavoidable discriminator: mapping is not supported error. Example code that throws:

import Ajv from "ajv";

const schema = {
  type: "object",
  properties: {
    type: {
      type: "string"
    },
    value: {
      oneOf: [
        {type: "string"},
        {type: "number"},
      ],
      discriminator: {
        propertyName: "type",
        mapping: {
          string: {type: "string"},
          number: {type: "number"},
        },
      },
    },
  },
};

const ajv = new Ajv({discriminator: true});
const validate = ajv.compile(schema); // Error: discriminator: mapping is not supported
console.info(validate({type: "string", value: "foo"}));

What do you think is the correct solution to problem?

Either implement discriminator.mapping as described here or alternatively gracefully ignore the presence of it so user code can implement this feature itself.

Will you be able to implement it?

I could probably make it gracefully ignore the property.