Exported types

Reference for Result, inference helpers, tagged error helpers, codec types, serialized envelopes, retry context, and Standard Schema types.

All public types are imported from better-result.

Result and inference

Type	Meaning
`Result<T, E>`	`Ok<T, E> \| Err<T, E>`
`Ok<T, E = never>`	success variant class
`Err<T, E>`	error variant class
`InferOk<R>`	extract the success type from a Result or variant
`InferErr<R>`	extract the error type from a Result or variant

const result = Result.gen(function* () {
  const user = yield* findUser(id);
  return Result.ok(user.name);
});

type Value = InferOk<typeof result>; // string
type Error = InferErr<typeof result>; // FindUserError

Tagged errors

Type	Meaning
`AnyTaggedError`	any tagged Error with `_tag` and `toJSON()`
`TaggedErrorClass<Tag>`	generic class returned by the factory
`TaggedErrorInstance<Tag, Props>`	structural tagged error instance with readonly Props

Retry context

Type	Fields
`TryContext`	`attempt: number` (one-based)
`TryPromiseContext`	`attempt: number`, optional `signal: AbortSignal`

Retry config itself is inferred from Result.tryPromise; it is not exported as a named type.

Serialized envelopes

Type	Shape
`SerializedOk<T>`	`{ status: "ok"; value: T }`
`SerializedErr<E>`	`{ status: "error"; error: E }`
`SerializedResult<T, E>`	`SerializedOk<T> \| SerializedErr<E>`

These describe wire envelopes, not proof of validation. Use Result.codec at untrusted boundaries.

Codec types

Type	Meaning
`ResultCodecConfig<...>`	four schemas for serialize/deserialize × ok/err
`ResultCodec<...>`	resulting `serialize` and `deserialize` operations
`ResultCodecIssue`	Standard Schema validation issue alias

Standard Schema types

Type	Meaning
`StandardSchemaV1<Input, Output>`	supported Standard Schema interface
`StandardSchemaInput<S>`	infer schema input
`StandardSchemaOutput<S>`	infer schema output
`StandardSchemaIssue`	one validation issue
`StandardSchemaPathSegment`	validation path property wrapper
`StandardSchemaResult<Output>`	schema success-or-issues result

Prefer your schema library’s public types in application code. These exports are useful for generic codec tooling and libraries that integrate directly with better-result.