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better-result\n\nLightweight Result type for TypeScript with generator-based composition.\n\nšŸ“– **[Documentation](https://better-result.dev/core/creating-results)**\n\n## Install\n\n```sh\nnpm install better-result\n```\n\nOr with Bun / pnpm:\n\n```sh\nbun add better-result\npnpm add better-result\n```\n\n## Quick Start\n\n```ts\nimport { Result } from \"better-result\";\n\n// Wrap throwing functions\nconst parsed = Result.try(() => JSON.parse(input));\n\n// Check and use\nif (Result.isOk(parsed)) {\n console.log(parsed.value);\n} else {\n console.error(parsed.error);\n}\n\n// Or use pattern matching\nconst message = parsed.match({\n ok: (data) => `Got: ${data.name}`,\n err: (e) => `Failed: ${e.message}`,\n});\n```\n\n## Contents\n\n- [Creating Results](#creating-results)\n- [Transforming Results](#transforming-results)\n- [Handling Errors](#handling-errors)\n- [Observing Results](#observing-results)\n- [Extracting Values](#extracting-values)\n- [Generator Composition](#generator-composition)\n- [Retry Support](#retry-support)\n- [UnhandledException](#unhandledexception)\n- [Panic](#panic)\n- [Tagged Errors](#tagged-errors)\n- [Serialization](#serialization)\n- [API Reference](#api-reference)\n- [Agents & AI](#agents--ai)\n\n## Creating Results\n\n```ts\n// Success\nconst ok = Result.ok(42);\n\n// Error\nconst err = Result.err(new Error(\"failed\"));\n\n// From throwing function\nconst result = Result.try(() => riskyOperation());\n\n// From promise\nconst result = await Result.tryPromise(() => fetch(url));\n\n// With custom error handling\nconst result = Result.try({\n try: () => JSON.parse(input),\n catch: (e) => new ParseError(e),\n});\n```\n\n## Transforming Results\n\n```ts\nconst result = Result.ok(2)\n .map((x) => x * 2) // Ok(4)\n .andThen(\n (\n x, // Chain Result-returning functions\n ) => (x > 0 ? Result.ok(x) : Result.err(\"negative\")),\n );\n\n// Standalone functions (data-first or data-last)\nResult.map(result, (x) => x + 1);\nResult.map((x) => x + 1)(result); // Pipeable\n```\n\n## Handling Errors\n\n```ts\n// Transform error type\nconst result = fetchUser(id).mapError((e) => new AppError(`Failed to fetch user: ${e.message}`));\n\n// Recover from specific errors while preserving the same success type\nconst result = fetchUser(id).tryRecover((e) =>\n e._tag === \"NotFoundError\" ? Result.ok(defaultUser) : Result.err(e),\n);\n\n// Async recovery follows the same pattern\n// If fetchUser is async and returns Promise>, await it first.\nconst result = await (\n await fetchUser(id)\n).tryRecoverAsync(async (e) =>\n e._tag === \"NetworkError\" ? Result.ok(await readUserFromCache(id)) : Result.err(e),\n);\n```\n\n## Observing Results\n\nUse `tap` / `tapAsync` for success-side logging or tracing, `tapError` / `tapErrorAsync` for error-side logging or tracing, and `tapBoth` / `tapBothAsync` when you want to observe either branch with one handler object. These methods do not transform the `Result` ā€” they always return the original value unchanged.\n\n```ts\nconst result = Result.try(() => JSON.parse(input))\n .tap((value) => {\n console.debug(\"parsed payload\", value);\n })\n .tapError((error) => {\n console.error(\"failed to parse payload\", error);\n });\n```\n\nIf you want to observe both branches symmetrically with one call, use `tapBoth`:\n\n```ts\nconst result = Result.try(() => JSON.parse(input)).tapBoth({\n ok: (value) => {\n console.info(\"decoded payload\", value);\n },\n err: (error) => {\n console.warn(\"decode failed\", error);\n },\n});\n```\n\nAsync side effects follow the same pattern:\n\n```ts\nconst result = await Result.err(\"request failed\").tapErrorAsync(async (error) => {\n await trace(\"request.failed\", { error });\n});\n```\n\n`tapBothAsync` works the same way for async observers on either branch:\n\n```ts\nconst observed = await Result.tapBothAsync(\n Result.try(() => JSON.parse(input)),\n {\n ok: async (value) => {\n await trace(\"payload.decoded\", { value });\n },\n err: async (error) => {\n await trace(\"payload.decode_failed\", { error });\n },\n },\n);\n```\n\nStatic helpers support both data-first and data-last styles:\n\n```ts\nconst traced = Result.tapError(Result.err(\"cache miss\"), (error) => {\n console.warn(\"cache lookup failed\", error);\n});\n\nconst traceError = Result.tapErrorAsync(async (error: string) => {\n await trace(\"cache.lookup_failed\", { error });\n});\n\nawait traceError(Result.err(\"cache miss\"));\n```\n\nIf you prefer, you can still observe both branches by chaining `tap` and `tapError` separately.\n\nThrown or rejected side-effect callbacks become `Panic`, just like other Result callbacks.\n\n## Extracting Values\n\n```ts\n// Unwrap (throws on Err)\nconst value = result.unwrap();\nconst value = result.unwrap(\"custom error message\");\n\n// With fallback\nconst value = result.unwrapOr(defaultValue);\n\n// Pattern match\nconst value = result.match({\n ok: (v) => v,\n err: (e) => fallback,\n});\n```\n\n## Generator Composition\n\nChain multiple Results without nested callbacks or early returns:\n\n```ts\nconst result = Result.gen(function* () {\n const a = yield* parseNumber(inputA); // Unwraps or short-circuits\n const b = yield* parseNumber(inputB);\n const c = yield* divide(a, b);\n return Result.ok(c);\n});\n// Result\n```\n\nAsync version with `Result.await`:\n\n```ts\nconst result = await Result.gen(async function* () {\n const user = yield* Result.await(fetchUser(id));\n const posts = yield* Result.await(fetchPosts(user.id));\n return Result.ok({ user, posts });\n});\n```\n\nErrors from all yielded Results are automatically collected into the final error union type.\n\n### Normalizing Error Types\n\nUse `mapError` on the output of `Result.gen()` to unify multiple error types into a single type:\n\n```ts\nclass ParseError extends TaggedError(\"ParseError\")<{ message: string }>() {}\nclass ValidationError extends TaggedError(\"ValidationError\")<{ message: string }>() {}\nclass AppError extends TaggedError(\"AppError\")<{ source: string; message: string }>() {}\n\nconst result = Result.gen(function* () {\n const parsed = yield* parseInput(input); // Err: ParseError\n const valid = yield* validate(parsed); // Err: ValidationError\n return Result.ok(valid);\n}).mapError((e): AppError => new AppError({ source: e._tag, message: e.message }));\n// Result - error union normalized to single type\n```\n\n## Retry Support\n\n```ts\nconst result = await Result.tryPromise(() => fetch(url), {\n retry: {\n times: 3,\n delayMs: 100,\n backoff: \"exponential\", // or \"linear\" | \"constant\"\n },\n});\n```\n\n### Conditional Retry\n\nRetry only for specific error types using `shouldRetry`:\n\n```ts\nclass NetworkError extends TaggedError(\"NetworkError\")<{ message: string }>() {}\nclass ValidationError extends TaggedError(\"ValidationError\")<{ message: string }>() {}\n\nconst result = await Result.tryPromise(\n {\n try: () => fetchData(url),\n catch: (e) =>\n e instanceof TypeError // Network failures often throw TypeError\n ? new NetworkError({ message: (e as Error).message })\n : new ValidationError({ message: String(e) }),\n },\n {\n retry: {\n times: 3,\n delayMs: 100,\n backoff: \"exponential\",\n shouldRetry: (e) => e._tag === \"NetworkError\", // Only retry network errors\n },\n },\n);\n```\n\n### Async Retry Decisions\n\nFor retry decisions that require async operations (rate limits, feature flags, etc.), enrich the error in the `catch` handler instead of making `shouldRetry` async:\n\n```ts\nclass ApiError extends TaggedError(\"ApiError\")<{\n message: string;\n rateLimited: boolean;\n}>() {}\n\nconst result = await Result.tryPromise(\n {\n try: () => callApi(url),\n catch: async (e) => {\n // Fetch async state in catch handler\n const retryAfter = await redis.get(`ratelimit:${userId}`);\n return new ApiError({\n message: (e as Error).message,\n rateLimited: retryAfter !== null,\n });\n },\n },\n {\n retry: {\n times: 3,\n delayMs: 100,\n backoff: \"exponential\",\n shouldRetry: (e) => !e.rateLimited, // Sync predicate uses enriched error\n },\n },\n);\n```\n\n## UnhandledException\n\nWhen `Result.try()` or `Result.tryPromise()` catches an exception without a custom handler, the error type is `UnhandledException`:\n\n```ts\nimport { Result, UnhandledException } from \"better-result\";\n\n// Automatic ā€” error type is UnhandledException\nconst result = Result.try(() => JSON.parse(input));\n// ^? Result\n\n// Custom handler ā€” you control the error type\nconst result = Result.try({\n try: () => JSON.parse(input),\n catch: (e) => new ParseError(e),\n});\n// ^? Result\n\n// Same for async\nawait Result.tryPromise(() => fetch(url));\n// ^? Promise>\n```\n\nAccess the original exception via `.cause`:\n\n```ts\nif (Result.isError(result)) {\n const original = result.error.cause;\n if (original instanceof SyntaxError) {\n // Handle JSON parse error\n }\n}\n```\n\n## Panic\n\nThrown (not returned) when user callbacks throw inside Result operations. Represents a defect in your code, not a domain error.\n\n```ts\nimport { Panic, isPanic } from \"better-result\";\n\n// Callback throws ā†’ Panic\nResult.ok(1).map(() => {\n throw new Error(\"bug\");\n}); // throws Panic\n\n// Generator cleanup throws ā†’ Panic\nResult.gen(function* () {\n try {\n yield* Result.err(\"expected failure\");\n } finally {\n throw new Error(\"cleanup bug\");\n }\n}); // throws Panic\n\n// Catch handler throws ā†’ Panic\nResult.try({\n try: () => riskyOp(),\n catch: () => {\n throw new Error(\"bug in handler\");\n },\n}); // throws Panic\n\n// Catching Panic (for error reporting)\ntry {\n result.map(() => {\n throw new Error(\"bug\");\n });\n} catch (error) {\n if (isPanic(error)) {\n // isPanic() is a type guard function\n console.error(\"Defect:\", error.message, error.cause);\n }\n\n if (Panic.is(error)) {\n // Panic.is() is a static method (same behavior)\n }\n\n if (error instanceof Panic) {\n // instanceof works too\n }\n}\n```\n\n**Why Panic?** `Err` is for recoverable domain errors. Panic is for bugs ā€” like Rust's `panic!()`. If your `.map()` callback throws, that's not an error to handle, it's a defect to fix. Returning `Err` would collapse type safety (`Result` becomes `Result`).\n\n**Panic properties:**\n\n| Property | Type | Description |\n| --------- | --------- | ----------------------------- |\n| `message` | `string` | Describes where/what panicked |\n| `cause` | `unknown` | The exception that was thrown |\n\nPanic also provides `toJSON()` for error reporting services (Sentry, etc.).\n\n## Tagged Errors\n\nBuild exhaustive error handling with discriminated unions:\n\n```ts\nimport { TaggedError, matchError, matchErrorPartial } from \"better-result\";\n\n// Factory API: TaggedError(\"Tag\")()\nclass NotFoundError extends TaggedError(\"NotFoundError\")<{\n id: string;\n message: string;\n}>() {}\n\nclass ValidationError extends TaggedError(\"ValidationError\")<{\n field: string;\n message: string;\n}>() {}\n\ntype AppError = NotFoundError | ValidationError;\n\n// Create errors with object args\nconst err = new NotFoundError({ id: \"123\", message: \"User not found\" });\n\n// Exhaustive matching\nmatchError(error, {\n NotFoundError: (e) => `Missing: ${e.id}`,\n ValidationError: (e) => `Bad field: ${e.field}`,\n});\n\n// Partial matching with fallback\nmatchErrorPartial(\n error,\n { NotFoundError: (e) => `Missing: ${e.id}` },\n (e) => `Unknown: ${e.message}`,\n);\n\n// Type guards\nTaggedError.is(value); // any tagged error\nNotFoundError.is(value); // specific class\n```\n\nFor errors with computed messages, add a custom constructor:\n\n```ts\nclass NetworkError extends TaggedError(\"NetworkError\")<{\n url: string;\n status: number;\n message: string;\n}>() {\n constructor(args: { url: string; status: number }) {\n super({ ...args, message: `Request to ${args.url} failed: ${args.status}` });\n }\n}\n\nnew NetworkError({ url: \"/api\", status: 404 });\n```\n\n## Serialization\n\nConvert Results to plain objects for RPC, storage, or server actions:\n\n```ts\nimport { Result, SerializedResult, ResultDeserializationError } from \"better-result\";\n\n// Serialize to plain object\nconst result = Result.ok(42);\nconst serialized = Result.serialize(result);\n// { status: \"ok\", value: 42 }\n\n// Deserialize back to Result instance\nconst deserialized = Result.deserialize(serialized);\n// Ok(42) - can use .map(), .andThen(), etc.\n\n// Invalid input returns ResultDeserializationError\nconst invalid = Result.deserialize({ foo: \"bar\" });\nif (Result.isError(invalid) && ResultDeserializationError.is(invalid.error)) {\n console.log(\"Bad input:\", invalid.error.value);\n}\n\n// Typed boundary for Next.js server actions\nasync function createUser(data: FormData): Promise> {\n const result = await validateAndCreate(data);\n return Result.serialize(result);\n}\n\n// Client-side\nconst serialized = await createUser(formData);\nconst result = Result.deserialize(serialized);\n```\n\n## API Reference\n\n### Result\n\n| Method | Description |\n| --------------------------------------- | ---------------------------------------------------------------------------------------- |\n| `Result.ok(value)` | Create success |\n| `Result.err(error)` | Create error |\n| `Result.try(fn)` | Wrap throwing function |\n| `Result.tryPromise(fn, config?)` | Wrap async function with optional retry |\n| `Result.isOk(result)` | Type guard for Ok |\n| `Result.isError(result)` | Type guard for Err |\n| `Result.gen(fn)` | Generator composition |\n| `Result.tryRecover(result, fn)` | Recover error into same success type |\n| `Result.tryRecoverAsync(result, fn)` | Async recover error into same success type |\n| `Result.tap(result, fn)` | Run side effect on success and return original result |\n| `Result.tapAsync(result, fn)` | Run async side effect on success and return original result |\n| `Result.tapError(result, fn)` | Run side effect on error and return original result |\n| `Result.tapErrorAsync(result, fn)` | Run async side effect on error and return original result |\n| `Result.tapBoth(result, handlers)` | Run side effect on either branch and return original result |\n| `Result.tapBothAsync(result, handlers)` | Run async side effect on either branch and return original result |\n| `Result.await(promise)` | Wrap Promise for generators |\n| `Result.serialize(result)` | Convert Result to plain object |\n| `Result.deserialize(value)` | Rehydrate serialized Result (returns `Err` on invalid input) |\n| `Result.partition(results)` | Split array into [okValues, errValues] |\n| `Result.flatten(result)` | Flatten nested Result |\n\n### Instance Methods\n\n| Method | Description |\n| ------------------------- | ------------------------------------------ |\n| `.isOk()` | Type guard, narrows to Ok |\n| `.isErr()` | Type guard, narrows to Err |\n| `.map(fn)` | Transform success value |\n| `.mapError(fn)` | Transform error value |\n| `.tryRecover(fn)` | Recover error into same success type |\n| `.tryRecoverAsync(fn)` | Async recover error into same success type |\n| `.andThen(fn)` | Chain Result-returning function |\n| `.andThenAsync(fn)` | Chain async Result-returning function |\n| `.match({ ok, err })` | Pattern match |\n| `.unwrap(message?)` | Extract value or throw |\n| `.unwrapOr(fallback)` | Extract value or return fallback |\n| `.tap(fn)` | Side effect on success |\n| `.tapAsync(fn)` | Async side effect on success |\n| `.tapError(fn)` | Side effect on error |\n| `.tapErrorAsync(fn)` | Async side effect on error |\n| `.tapBoth(handlers)` | Side effect on either branch |\n| `.tapBothAsync(handlers)` | Async side effect on either branch |\n\n### TaggedError\n\n| Method | Description |\n| -------------------------------------- | ---------------------------------- |\n| `TaggedError(tag)()` | Factory for tagged error class |\n| `TaggedError.is(value)` | Type guard for any TaggedError |\n| `matchError(err, handlers)` | Exhaustive pattern match by `_tag` |\n| `matchErrorPartial(err, handlers, fb)` | Partial match with fallback |\n| `isTaggedError(value)` | Type guard (standalone function) |\n| `panic(message, cause?)` | Throw unrecoverable Panic |\n| `isPanic(value)` | Type guard for Panic |\n\n### Type Helpers\n\n| Type | Description |\n| ------------------------ | ---------------------------- |\n| `InferOk` | Extract Ok type from Result |\n| `InferErr` | Extract Err type from Result |\n| `SerializedResult` | Plain object form of Result |\n| `SerializedOk` | Plain object form of Ok |\n| `SerializedErr` | Plain object form of Err |\n\n## Agents & AI\n\nbetter-result ships with portable `SKILL.md` skills instead of an interactive CLI.\n\n### Available skills\n\n- `better-result-adopt` ā€” adopt `better-result` in an existing codebase\n- `better-result-migrate-v2` ā€” migrate v1 `TaggedError` usage to the v2 API\n\nThese skills are designed to work with SKILL.md-compatible agents and skills.sh-compatible tooling.\n\n### Install with skills.sh-compatible tooling\n\n```sh\nnpx skills add dmmulroy/better-result@better-result-adopt\nnpx skills add dmmulroy/better-result@better-result-migrate-v2\n```\n\nTo install globally without prompts:\n\n```sh\nnpx skills add dmmulroy/better-result@better-result-adopt -g -y\n```\n\n### Manual installation\n\nIf your agent does not support skills.sh installation, copy one of these directories into the agent's skills folder:\n\n- `skills/better-result-adopt/`\n- `skills/better-result-migrate-v2/`\n\n### What the skills do\n\n`better-result-adopt` guides an agent through:\n\n- converting try/catch to `Result.try` / `Result.tryPromise`\n- defining `TaggedError` classes for domain errors\n- refactoring nested error handling into `Result.gen`\n- replacing nullable or sentinel error returns with `Result`\n\n`better-result-migrate-v2` guides an agent through:\n\n- migrating `TaggedError` classes from v1 to v2 factory syntax\n- updating constructor call sites to the new object form\n- replacing `TaggedError.match*` helpers with standalone helpers\n- updating imports and verifying no old API usages remain\n\n### Optional source context\n\nFor richer AI context in a consuming project:\n\n```sh\nnpx opensrc better-result\n```\n\nSee [skills/README.md](skills/README.md) for a concise skill-install reference.\n\n## License\n\nMIT","users":{}}