effect-schema-v4

Start with the rename tables: annotations becomes annotate, compose becomes decodeTo, and filters like minLength become checks like isMinLength used with .check(). Transforms move from Schema.transform to Schema.decodeTo with SchemaTransformation.

Schema.filter is replaced by .check() with is-prefixed validators such as Schema.isMinLength(5) or Schema.isInt(). Custom predicates use Schema.makeFilter, and type-narrowing refinements use Schema.refine.

No, Schema.transform and Schema.transformOrFail were removed. Use Schema.decodeTo with SchemaTransformation.transform for pure bidirectional transforms, or SchemaGetter.transformOrFail for fallible effectful transforms.

Schema.Data was removed in v4 with no replacement needed. Equal.equals now performs deep structural comparison on plain objects by default, so plain structs get structural equality out of the box.

Use mapFields with Struct helpers: struct.mapFields(Struct.pick(['a'])) for pick, Struct.omit(['b']) for omit, Struct.map(Schema.optional) for partial, and Struct.assign for extending structs.

Most failures come from renamed APIs: decodeEither is now decodeExit, parseJson is now UnknownFromJsonString, and *FromSelf schemas dropped the suffix. Check the rename tables to find the v4 equivalent of each failing call.