Helpers are not passed into validation method in extends.

[SamJust]

Support plan

• which support plan is this issue covered by?: Community
• is this issue currently blocking your project?: no:
• is this issue affecting a production system?: no

Context

• node version: 10.15.3
• module version with issue: 16.1.7
• last module version without issue: -
• environment: node
• used with: koa v2.7.0
• any other relevant information:

What are you trying to achieve or the steps to reproduce?

When extending joi, the documentation (https://hapi.dev/family/joi/?v=16.1.7#extensions) says that validate method takes helpers as 3rd argument, though undefined is passed.

const extension = (joi) => ({
    type: 'objectId',
    base: Joi.string(),
    messages: {
        'mongoId.not': '"{{#label}}" must be object Id'
    },
    validate(schema, value, helpers) {
        if (!mongoose.Types.ObjectId.isValid(value.original)) {
            return { value, errors: helpers.error('mongoId.not') }; // helpers is undefined here, an error is thrown
        }
        return { value, errors: null };
    }
});

const custom = Joi.extend(extension);

What was the result you got?

Error in the validate method "Cannot read property "error" of undefined"

What result did you expect?

A 3rd argument with helerp functions.

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