feat: improve TypeScript type inference to Joi schemas#3104
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Improve compile-time type inference for Joi.inferType<typeof schema> correct TypeScript types from schema definitions. validate().value and Joi.attempt() now return inferred types instead of any. - Phantom type properties (~output, ~input, ~flags) on AnySchema - SchemaFlags with presence, hasDefault, isStripped tracking - Intersection return types for .required(), .optional(), .forbidden(), .strip(), .default(), .failover(), .valid() - Joi.object() captures schema map via TShape generic - InferObjectOutput splits keys into required/optional - .keys(), .append(), .concat() preserve shape inference - .ordered() infers tuples, .sparse() adds undefined - .when() infers union of then/otherwise branches - InferType, InferInput, InferOutput utility types - Typed Joi.assert() with type narrowing assertion - Joi.extend<TypeMap>() returns Root & TypeMap - Input/output distinction for .default() - Exhaustive negative tests (expect.error) proving inference is real
…), append(), and concat()
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Improve compile-time type inference so Joi.inferType extracts correct TypeScript types from schema definitions. validate().value and Joi.attempt() now return inferred types instead of any.