types: correct this parameter for methods with versionKey

[vkarpov15]

Fix #16046

Summary

Omit this from methods because of versionKey option handling mismatch. Schema.create() already does this with the original fix for #16046 here.

Mongoose adds this parameter to methods with AddThisParameter<> so the method body gets type checked correctly in new Schema() (this is correctly set to the inferred document), but then Mongoose strips this when the methods are added to the actual hydrated document type, because at that point TypeScript already knows the correct type of this (the actual document).

Examples

[Copilot]

Pull request overview

Adjusts Mongoose’s TypeScript typings so hydrated document method types don’t retain an explicit this parameter, avoiding this-context incompatibilities that can show up when schema options like versionKey affect inferred document/model types (per #16046).

Changes:

• Introduces HydratedDocumentOverrides<> to strip this parameters from function-valued overrides.
• Applies HydratedDocumentOverrides<> when composing HydratedDocument<> with overrides.
• Extends type tests to cover versionKey + methods scenarios and ensure method return types are preserved.

Reviewed changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated no comments.

File	Description
types/utility.d.ts	Adds helper mapped types to omit this from function properties in overrides.
types/index.d.ts	Wraps HydratedDocument override composition with HydratedDocumentOverrides<>.
test/types/schema.test.ts	Updates the existing gh-16046 type regression to include versionKey and assert method return typing on hydrated docs.
test/types/models.test.ts	Adds a second gh-16046 type regression covering schema methods with custom versionKey.