feat(model): add standard schema adapter for models

[vkarpov15]

Fix #16280

cc @ssalbdivad

Summary

Support for ~standard validate adapter. See standard schema docs.

Outstanding questions:

1. Casting: is User['~standard'].validate({ age: '42' }) ok given that Mongoose will convert string '42' to number 42 and return the result in result?

Examples

[Copilot]

Pull request overview

Adds first-class support for the Standard Schema v1 ~standard adapter on Mongoose models, enabling model-based validation that returns Standard Schema-compatible { value } / { issues } results (Fixes #16280).

Changes:

• Add Model['~standard'] runtime implementation that wraps Model.validate() and converts Mongoose validation errors into Standard Schema issue arrays.
• Add TypeScript declarations for mongoose.StandardSchemaV1 and the Model['~standard'] property.
• Add runtime + type-level tests covering success/failure results, pathsToSkip, and discriminator behavior.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
types/models.d.ts	Defines StandardSchemaV1 types and adds Model['~standard'] to the public model type surface.
test/types/models.test.ts	Adds type tests asserting adapter shape and result typing/narrowing behavior.
test/model.validate.test.js	Adds runtime tests for Standard Schema result format, pathsToSkip, and discriminator support.
lib/standardSchema/convertErrorToIssues.js	Converts Mongoose ValidationError into Standard Schema issues with array-based path.
lib/model.js	Implements Model['~standard'] via a getter that wraps Model.validate() and formats results.

[hasezoey]

Looks good to me from a mongoose perspective, i dont know if it is correct according to Standard Schema though.

[hasezoey]

This link got messed up.

Nevermind, didnt see the closing ), still all links should start with mongoosejs.com as they are replaced automatically and so can work in jsdoc too.