Cheat sheet

// run: Console.log(hello("1"))
type Findtype Find = (id: string) => User!NotFound! = (id(parameter) id: string: string) => User(alias) interface User!NotFound(alias) class NotFound
type Releasetype Release = (version: string) => string!!Approval = (version(parameter) version: string: string) => string!!Approval(alias) abstract class Approval
type Loadtype Load = () => string!! = () => string!!
function hellofunction hello(id: string): string!NotFound!(id(parameter) id: string: string): string!NotFound(alias) class NotFound {
  return `Hello, ${getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.(id(parameter) id: string).name(property) User.name: string}`
}
// Output: Hello, Ada

errorclass Missing Missingclass Missing { id(property) id: string: string }
errorclass Timeout Timeoutclass Timeout

serviceabstract class Users Usersabstract class Users {
  find(method) Users.find(id: string): User!NotFound!(id(parameter) id: string: string): User(alias) interface User!NotFound(alias) class NotFound
  region(property) Users.region: string: string
}

controlabstract class Review Reviewabstract class Review {
  approve(method) Review.approve(request: string): boolean!!(request(parameter) request: string: string): boolean!!
}

// run: provide UsersLive { Console.log(JSON.stringify(Users.find("1"))); Console.log(Users().region) }
const UsersLiveconst UsersLive: Layer<Users, never, never>Layer: provides Users; needs nothing. = Layer(alias) module "effect/Layer".effectconst effect: <Users, {
    find(id: string): User!NotFound!;
    region: string;
}, never, never>(service: Key<Users, {
    find(id: string): User!NotFound!;
    region: string;
}>, effect: {
    find(id: string): User!NotFound!;
    region: string;
}!!) => Layer<Users, never, never>Constructs a layer from an effect that produces a single service.(Users(alias) abstract class Users) {
  const seenconst seen: Set<string> = new Setvar Set: new <string>(iterable?: Iterable<string> | null | undefined) => Set<string><string>()
  return {
    find(method) find(id: string): User!NotFound!(id(parameter) id: string) { return getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.(id(parameter) id: string) },
    region(property) region: string: "eu"
  }
}
// Output: {"id":"1","name":"Ada"}
// Output: eu

// run: Console.log(JSON.stringify(Schema.decodeUnknownEffect(Account)({ id: "1", role: "admin" })))
schema Accountconst Account: Struct<{
    readonly id: String;
    readonly nickname: optional<String>;
    readonly role: Literals<readonly ["admin", "member"]>;
}> {
  id(property) id: String: string
  nickname(property) nickname: optional<String>?: string
  role(property) role: Literals<readonly ["admin", "member"]>: "admin" | "member"
}
// Output: {"id":"1","role":"admin"}

interface Cartinterface Cart { id(property) Cart.id: string: string; mutable items(property) Cart.items: string[]: Arrayinterface Array<T><string> }

// run: Console.log(Effect.provide(() => greetUser("1"), Logger.layer([sync(() => Logger.make(({ message }) => console.log(...(message as unknown[]))))])))
function greetUserfunction greetUser(id: string): string!NotFound!(id(parameter) id: string: string) {
  const userconst user: User = getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.(id(parameter) id: string)
  Console(alias) module "effect/Console".logconst log: (...args: ReadonlyArray<any>) => void!!Runs here and returns void.Logs a general-purpose message to the console.(`Hello, ${userconst user: User.name(property) User.name: string}`)
  return userconst user: User.name(property) User.name: string
}
// Output: Hello, Ada
// Output: Ada

// run: Console.log(fastest().name)
function fastestfunction fastest(): User!NotFound!() {
  const userconst user: User = getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.("1")
  return raceconst race: <User, NotFound, never, User, NotFound, never>(self: User!NotFound!, that: User!NotFound!, options?: {
    readonly onWinner?: (options: {
        readonly fiber: Fiber<any, any>;
        readonly index: number;
        readonly parentFiber: Fiber<any, any>;
    }) => void;
}) => User!NotFound!Runs here and returns User.Races two effects and returns the first successful result.(getUser(alias) function getUser(id: string): User!NotFound!Passed by name to race as a program: it runs when that program runs, not here, and returns User.("1"), getUser(alias) function getUser(id: string): User!NotFound!Passed by name to race as a program: it runs when that program runs, not here, and returns User.("2"))
}
// Output: Ada

// run: Console.log(JSON.stringify(program()))
function programfunction program(): User!NotFound!() {
  provide UsersLive(alias) const UsersLive: Layer<Users, never, never>Layer: provides Users; needs nothing. {
    return Users(alias) abstract class Users.find(method) Users.find(id: string): User!NotFound!Runs here and returns User.("1")
  }
}
// Output: {"id":"1","name":"Ada"}

// run: Console.log(roll())
const seededconst seeded: {
    nextIntUnsafe: () => number;
    nextDoubleUnsafe: () => number;
} = { nextIntUnsafe(property) nextIntUnsafe: () => number: () => 4, nextDoubleUnsafe(property) nextDoubleUnsafe: () => number: () => 0.5 }

function rollfunction roll(): number!!(): number!! {
  provide Logger(alias) module "effect/Logger".layerconst layer: <readonly []>(loggers: readonly [], options?: {
    readonly mergeWithExisting?: boolean | undefined;
} | undefined) => Layer<never, never, never>Creates a Layer which will overwrite the current set of loggers with the
specified array of loggers.([]), Random(alias) module "effect/Random"Provides the service Random.Random to this provide block's statements. = seededconst seeded: {
    nextIntUnsafe: () => number;
    nextDoubleUnsafe: () => number;
} {
    return Random(alias) module "effect/Random".nextIntconst nextInt: () => number!!Runs here and returns number.Generates a random integer between Number.MIN_SAFE_INTEGER (inclusive)
and Number.MAX_SAFE_INTEGER (inclusive).()
  }
}
// Output: 4

// run: Console.log(JSON.stringify([describe("1"), describe("missing")]))
function describefunction describe(id: string): string!!(id(parameter) id: string: string) {
  try {
    return getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.(id(parameter) id: string).name(property) User.name: string
  } catch (evar e: NotFound) {
    return match (e) {
      when NotFound(alias) class NotFound: `no user ${evar e: NotFound.id(property) id: string}`;
    }
  }
}
// Output: ["Ada","no user missing"]

// run: Console.log(JSON.stringify([nameOrGuest("1"), nameOrGuest("missing")]))
function nameOrGuestfunction nameOrGuest(id: string): string!!(id(parameter) id: string: string) {
  return getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.(id(parameter) id: string).name(property) User.name: string catchcatchRuns the left side and, after an expected failure (NotFound), the fallback instead (Effect.orElseSucceed). Returns string. Defects and interrupts pass through. "guest"
}
// Output: ["Ada","guest"]

// run: Console.log(JSON.stringify([nameOrReason("1"), nameOrReason("missing")]))
function nameOrReasonfunction nameOrReason(id: string): string!!(id(parameter) id: string: string) {
  return getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.(id(parameter) id: string).name(property) User.name: string catchcatchRuns the left side and passes an expected failure, NotFound, to the handler (Effect.catch). Returns string. Defects and interrupts pass through. (e(parameter) e: NotFound) => match (e) {
    when NotFound(alias) class NotFound: `no user ${e(parameter) e: NotFound.id(property) id: string}`;
  }
}
// Output: ["Ada","no user missing"]

// run: Console.log(auto("v1"))
function autofunction auto(version: string): string!!(version(parameter) version: string: string) {
  try {
    return release(alias) function release(version: string): string!!ApprovalRuns here and returns string.(version(parameter) version: string)
  } handle Approval(alias) abstract class Approval.approve(method) Approval.approve(request: string): boolean!!(requestconst request: string) {
    resumeconst resume: <boolean, never, never>(k: Continuation<boolean, never, never>, value: boolean) => !!Runs here and returns never.Continues the program with value at the perform site; returns what the handle then produces.(true)
  }
}
// Output: released v1

// run: Effect.provide(main(), Logger.layer([sync(() => Logger.make(({ message }) => console.log(...(message as unknown[]))))]))
export function mainfunction main(): void!!() {
  logconst log: (...message: ReadonlyArray<any>) => void!!Runs here and returns void.Logs one or more messages using the default log level.("Hello")
}
// Output: Hello

// run: Console.log(safe("1")); Console.log(safe("missing").includes("NotFound"))
function safefunction safe(id: string): string!!(id(parameter) id: string: string) {
  return match (exitconst exit: <User, NotFound, never>(self: User!NotFound!) => Exit<User, NotFound>!!Runs here and returns Exit<User, NotFound>.Transforms an effect to encapsulate both failure and success using the Exit
data type.(getUser(alias) function getUser(id: string): User!NotFound!Passed by name to exit as a program: it runs when that program runs, not here, and returns User.(id(parameter) id: string))) {
    when Exit.Success(let userlet user: User): userlet user: User.name(property) User.name: string;
    when Exit.Failure(let causelet cause: Cause<NotFound>): `failed: ${Cause(alias) module "effect/Cause".prettyconst pretty: <NotFound>(cause: Cause<NotFound>) => stringFormats a Cause as a human-readable string for logging or debugging.(causelet cause: Cause<NotFound>)}`;
  }
}
// Output: Ada
// Output: true

// run: Console.log(JSON.stringify(logged()))
function loggedfunction logged(): User!NotFound!() {
  const outcomeconst outcome: Exit<User, NotFound> = exitconst exit: <User, NotFound, never>(self: User!NotFound!) => Exit<User, NotFound>!!Runs here and returns Exit<User, NotFound>.Transforms an effect to encapsulate both failure and success using the Exit
data type.(getUser(alias) function getUser(id: string): User!NotFound!Passed by name to exit as a program: it runs when that program runs, not here, and returns User.("1"))
  if (outcome is Exit.Failure(let causelet cause: Cause<NotFound>)) {
    logErrorconst logError: (...message: ReadonlyArray<any>) => void!!Runs here and returns void.Logs one or more messages at the ERROR level.(causelet cause: Cause<NotFound>)
    throw causelet cause: Cause<NotFound>
  }
  return outcomeconst outcome: Success<User, NotFound>.value(property) Success<User, NotFound>.value: User
}
// Output: {"id":"1","name":"Ada"}

// run: Console.log(Effect.provide(() => tracked().name, Logger.layer([sync(() => Logger.make(({ message }) => console.log(...(message as unknown[]))))])))
function trackedfunction tracked(): User!NotFound!() {
  try {
    return getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.("1")
  } finally (exitconst exit: Failure<void, NotFound> | Success<void, NotFound>) {
    logconst log: (...message: ReadonlyArray<any>) => void!!Runs here and returns void.Logs one or more messages using the default log level.(`lookup ${exitconst exit: Failure<void, NotFound> | Success<void, NotFound>._tag(property) _tag: "Failure" | "Success"}`)
  }
}
// Output: lookup Success
// Output: Ada

// run: Console.log(outcome()._tag)
function outcomefunction outcome(): Exit<User, NotFound>!!() {
  const resultconst result: Exit<User, NotFound> = exitconst exit: <User, NotFound, never>(self: User!NotFound!) => Exit<User, NotFound>!!Runs here and returns Exit<User, NotFound>.Transforms an effect to encapsulate both failure and success using the Exit
data type.(getUser(alias) function getUser(id: string): User!NotFound!Passed by name to exit as a program: it runs when that program runs, not here, and returns User.("1"))
  yieldNowconst yieldNow: (priority?: number) => void!!Runs here and returns void.Bare yieldNow() (D179): yields to the scheduler, with an optional priority.()
  if (result is Exit.Failure) interruptconst interrupt: () => !!Runs here and returns never.Bare interrupt() (D179): interrupts the running fiber, as Effect.interrupt.()
  return resultconst result: Exit<User, NotFound>
}
// Output: Success

// run: Console.log(JSON.stringify([guarded(), cancellable()]))
function guardedfunction guarded(): {
    user: User;
    orders: number;
}!NotFound!() {
  uninterruptible {
    const userconst user: User = getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.("1")
    restore {
      return { user(property) user: User, orders(property) orders: number: getOrdersfunction getOrders(id: string): numberPlain JavaScript: VibeLang code calls it directly. TypeScript callers see Effect<number, never, never>.(userconst user: User.id(property) User.id: string) }
    }
  }
}

function cancellablefunction cancellable(): number!!() {
  interruptible {
    return getOrdersfunction getOrders(id: string): numberPlain JavaScript: VibeLang code calls it directly. TypeScript callers see Effect<number, never, never>.("1")
  }
}
// Output: [{"user":{"id":"1","name":"Ada"},"orders":1},1]

// run: ready()
function readyfunction ready(): void!!() {
  Console(alias) module "effect/Console".logconst log: (...args: ReadonlyArray<any>) => void!!Runs here and returns void.Logs a general-purpose message to the console.("ready")
}
// Output: ready

// run: Console.log(JSON.stringify(patient()))
function patientfunction patient(): User!NotFound | TimeoutError!() {
  sleepconst sleep: (duration: Duration.Input) => void!!Runs here and returns void.Returns an effect that suspends the current fiber for the specified duration
without blocking a JavaScript thread.("10 millis")
  return timeoutconst timeout: <User, NotFound, never>(self: User!NotFound!, duration: Duration.Input) => User!NotFound | TimeoutError!Runs here and returns User.Adds a time limit to an effect, triggering a timeout if the effect exceeds
the duration.(retryconst retry: <User, NotFound, never, number, never, never>(self: User!NotFound!, policy: Schedule<number, NotFound, never, never>) => User!NotFound!Passed by name to timeout as a program: it runs when that program runs, not here, and returns User.Retries typed failures from an effect according to a retry policy.(getUser(alias) function getUser(id: string): User!NotFound!Passed by name to retry as a program: it runs when that program runs, not here, and returns User.("1"), Schedule(alias) module "effect/Schedule".recursconst recurs: (times: number) => Schedule<number>Returns a Schedule which can only be stepped the specified number of
times before it terminates.(2)), "1 second")
}
// Output: {"id":"1","name":"Ada"}

// run: Console.log(JSON.stringify(Stream.runCollect(hot())))
functionfunction hot(): Stream<string, never, never>!! hotfunction hot(): Stream<string, never, never>Plain JavaScript: VibeLang code calls it directly. TypeScript callers see Effect<Stream<string, never, never>, never, never>.() {
  return Stream(alias) module "effect/Stream".makeconst make: <readonly [18, 25, 30]>(values_0: 18, values_1: 25, values_2: 30) => Stream<18 | 25 | 30, never, never>Creates a stream from a sequence of values.(18, 25, 30).filter(property) filter: <18 | 25 | 30, never, never>(self: Stream<18 | 25 | 30, never, never>, predicate: Predicate<18 | 25 | 30>) => Stream<18 | 25 | 30, never, never>Method syntax: calls Stream.filter(Stream.make(18, 25, 30), …).Filters a stream to the elements that satisfy a predicate.((c(parameter) c: 18 | 25 | 30) => c(parameter) c: 18 | 25 | 30 >= 25).map(property) map: <18 | 25 | 30, never, never, string>(self: Stream<18 | 25 | 30, never, never>, f: (a: 18 | 25 | 30, i: number) => string) => Stream<string, never, never>Method syntax: calls Stream.map(Stream.make(18, 25, 30).filter((c) => c >= 25), …).Transforms the elements of this stream using the supplied function.((c(parameter) c: 18 | 25 | 30) => `${c(parameter) c: 18 | 25 | 30} C`).take(property) take: <string, never, never>(self: Stream<string, never, never>, n: number) => Stream<string, never, never>Method syntax: calls Stream.take(Stream.make(18, 25, 30).filter((c) => c >= 25).map((c) => ${c} C), …).Takes the first n elements from this stream.(2)
}
// Output: ["25 C","30 C"]

// run: Console.log(JSON.stringify(piped()))
function pipedfunction piped(): User!NotFound | TimeoutError!() {
  return getUser(alias) function getUser(id: string): User!NotFound!Passed by name to retry as a program: it runs when that program runs, not here, and returns User.("1") |> retryconst retry: <User, NotFound, never, number, never, never>(self: User!NotFound!, policy: Schedule<number, NotFound, never, never>) => User!NotFound!Passed by name to timeout as a program: it runs when that program runs, not here, and returns User.Retries typed failures from an effect according to a retry policy.(%(topic) %: User!NotFound!Passed by name to retry as a program: getUser("1") runs when that program runs, not here., Schedule(alias) module "effect/Schedule".recursconst recurs: (times: number) => Schedule<number>Returns a Schedule which can only be stepped the specified number of
times before it terminates.(2)) |> timeoutconst timeout: <User, NotFound, never>(self: User!NotFound!, duration: Duration.Input) => User!NotFound | TimeoutError!Runs here and returns User.Adds a time limit to an effect, triggering a timeout if the effect exceeds
the duration.(%(topic) %: User!NotFound!Passed by name to timeout as a program: getUser("1") |> retry(%, Schedule.recurs(2)) runs when that program runs, not here., "1 second")
}
// Output: {"id":"1","name":"Ada"}

// run: Console.log(findUser(new Map([["1", { id: "1", name: "Ada" }]]), "1").name); Console.log(Effect.result(findUser(new Map<string, User>(), "missing"))._tag)
function findUserfunction findUser(users: Map<string, User>, id: string): User!NotFound!(users(parameter) users: Map<string, User>: Mapinterface Map<K, V><string, User(alias) interface User>, id(parameter) id: string: string) {
  return users(parameter) users: Map<string, User>.get(method) Map<string, User>.get(key: string): User | undefinedReturns a specified element from the Map object. If the value that is associated to the provided key is an object, then you will get a reference to that object and any change made to that object will effectively modify it inside the Map.(id(parameter) id: string) ?? throw new NotFound(alias) constructor NotFound<{
    readonly id: string;
}>(args: {
    readonly id: string;
}): NotFound({ id(property) id: string })
}
// Output: Ada
// Output: Failure

// run: Console.log(label("1"))
function labelfunction label(id: string): string!NotFound!(id(parameter) id: string: string) {
  const nameconst name: string = do {
    const userconst user: User = getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.(id(parameter) id: string)
    if (userconst user: User.name(property) User.name: string.length(property) String.length: numberReturns the length of a String object. > 3) userconst user: User.name(property) User.name: string
    else "short"
  }
  return nameconst name: string
}
// Output: short

// run: Console.log(loaded())
function loadedfunction loaded(): string!NotFound!() {
  return withSpanconst withSpan: <string, NotFound, never>(name: string, self: string!NotFound!) => string!NotFound!Runs here and returns string.Wraps the effect with a child span for tracing.("load") {
    const userconst user: User = getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.("1")
    return userconst user: User.name(property) User.name: string
  }
}

// Output: Ada

// run: Console.log(JSON.stringify([phaseLabel("draft"), phaseLabel("published")]))
functionfunction phaseLabel(phase: "draft" | "published"): "Draft" | "Published"!! phaseLabelfunction phaseLabel(phase: "draft" | "published"): "Draft" | "Published"Plain JavaScript: VibeLang code calls it directly. TypeScript callers see Effect<"Draft" | "Published", never, never>.(phase(parameter) phase: "draft" | "published": "draft" | "published") {
  return match (phase) {
    when "draft": "Draft";
    when "published": "Published";
  }
}
// Output: ["Draft","Published"]

// run: Console.log(JSON.stringify([describeFailure(new NotFound({ id: "7" })), describeFailure(new Timeout())]))
functionfunction describeFailure(failure: NotFound | Timeout): string!! describeFailurefunction describeFailure(failure: NotFound | Timeout): stringPlain JavaScript: VibeLang code calls it directly. TypeScript callers see Effect<string, never, never>.(failure(parameter) failure: NotFound | Timeout: NotFound(alias) class NotFound | Timeout(alias) class Timeout) {
  return match (failure) {
    when NotFound and { let idlet id: string }: `no user ${idlet id: string}`;
    when Timeout(alias) class Timeout: "retry";
  }
}
// Output: ["no user 7","retry"]

// run: Console.log(greet(Option.some("Ada"))); Console.log(greet(Option.none())); Console.log(failed(Exit.fail(new NotFound({ id: "7" })))); Console.log(failed(Exit.succeed({ id: "1", name: "Ada" })))
functionfunction greet(name: Option.Option<string>): string!! greetfunction greet(name: Option.Option<string>): stringPlain JavaScript: VibeLang code calls it directly. TypeScript callers see Effect<string, never, never>.(name(parameter) name: Option<string>: Option(alias) module "effect/Option".Optiontype Option<A> = None<A> | Some<A>The Option data type represents optional values. An Option<A> is either
Some<A>, containing a value of type A, or None, representing absence.<string>) {
  return match (name) {
    when Option.Some(let nlet n: string): `Hello, ${nlet n: string}`;
    when Option.None: "Hello";
  }
}

functionfunction failed(outcome: Exit.Exit<User, NotFound>): boolean!! failedfunction failed(outcome: Exit.Exit<User, NotFound>): booleanPlain JavaScript: VibeLang code calls it directly. TypeScript callers see Effect<boolean, never, never>.(outcome(parameter) outcome: Exit<User, NotFound>: Exit(alias) module "effect/Exit".Exittype Exit<A, E = never> = Failure<A, E> | Success<A, E>Represents the result of an Effect computation.<User(alias) interface User, NotFound(alias) class NotFound>) {
  return outcome is Exit.Failure
}
// Output: Hello, Ada
// Output: Hello
// Output: true
// Output: false

// run: Console.log(firstFailure(Exit.succeed({ id: "1", name: "Ada" }))); Console.log(firstFailure(Exit.fail(new NotFound({ id: "7" }))).includes("NotFound"))
functionfunction firstFailure(outcome: Exit.Exit<User, NotFound>): string!! firstFailurefunction firstFailure(outcome: Exit.Exit<User, NotFound>): stringPlain JavaScript: VibeLang code calls it directly. TypeScript callers see Effect<string, never, never>.(outcome(parameter) outcome: Exit<User, NotFound>: Exit(alias) module "effect/Exit".Exittype Exit<A, E = never> = Failure<A, E> | Success<A, E>Represents the result of an Effect computation.<User(alias) interface User, NotFound(alias) class NotFound>) {
  if (outcome is Exit.Failure(let causelet cause: Cause<NotFound>) && Cause(alias) module "effect/Cause".hasFailsconst hasFails: <NotFound>(self: Cause<NotFound>) => booleanReturns true if the cause contains at least one Fail reason.(causelet cause: Cause<NotFound>)) return Cause(alias) module "effect/Cause".prettyconst pretty: <NotFound>(cause: Cause<NotFound>) => stringFormats a Cause as a human-readable string for logging or debugging.(causelet cause: Cause<NotFound>)
  return "ok"
}
// Output: ok
// Output: true

// run: provide Logger.layer([sync(() => Logger.make(({ message }) => console.log(...(message as unknown[]))))]) { const value = hatches('{"ok":true}', "data:text/plain,hello"); Console.log(JSON.stringify({ ...value, id: /^[0-9a-f-]{36}$/.test(value.id) })) }
errorclass BadJson BadJsonclass BadJson { error(property) error: unknown: unknown }

function hatchesfunction hatches(text: string, url: string): {
    id: `${string}-${string}-${string}-${string}-${string}`;
    parsed: any;
    loaded: number;
    status: number;
    tick: number;
    name: string;
}!BadJson | UnknownError!(text(parameter) text: string: string, url(parameter) url: string: string) {
  const idconst id: `${string}-${string}-${string}-${string}-${string}` = syncfunction sync<`${string}-${string}-${string}-${string}-${string}`>(value: `${string}-${string}-${string}-${string}-${string}`): `${string}-${string}-${string}-${string}-${string}`!!An escape hatch: its first argument is self-contained TypeScript (D229).Runs here and returns ${string}-${string}-${string}-${string}-${string}.(cryptovar crypto: CryptoMDN Reference.randomUUID(method) Crypto.randomUUID(): `${string}-${string}-${string}-${string}-${string}`The randomUUID() method of the Crypto interface is used to generate a v4 UUID using a cryptographically secure random number generator.
Available only in secure contexts.())
  const parsedconst parsed: any = try(alias) function attempt<any, BadJson, [string]>(evaluate: (args_0: string) => any, mapError: (error: unknown) => BadJson, args_0: string): any!BadJson!An escape hatch: its first argument is self-contained TypeScript (D229). Inputs, which fill its first parameters: text.Runs here and returns any.((text(parameter) text: string) => JSONvar JSON: JSONAn intrinsic object that provides functions to convert JavaScript values to and from the JavaScript Object Notation (JSON) format..parse(method) JSON.parse(text: string, reviver?: (this: any, key: string, value: any) => any): anyConverts a JavaScript Object Notation (JSON) string into an object.(text(parameter) text: string), (error(parameter) error: unknown) => new BadJsonconstructor BadJson<{
    readonly error: unknown;
}>(args: {
    readonly error: unknown;
}): BadJson({ error(property) error: unknown }), text(parameter) text: string)
  const loadedconst loaded: number = syncfunction sync<number, []>(evaluate: (args_0: AbortSignal) => PromiseLike<number>): number!!An escape hatch: its first argument is self-contained TypeScript (D229).Runs here and returns number.(async () => Promisevar Promise: PromiseConstructor.resolve(method) PromiseConstructor.resolve<number>(value: number): Promise<number>Creates a new resolved promise for the provided value.(42))
  const fetchedconst fetched: Response = try(alias) function attempt<Response, [string]>(evaluate: (args_0: string, args_1: AbortSignal) => PromiseLike<Response>, args_0: string): Response!UnknownError!An escape hatch: its first argument is self-contained TypeScript (D229). Inputs, which fill its first parameters: url.Runs here and returns Response.(async (url(parameter) url: string, signal(parameter) signal: AbortSignal) => fetchfunction fetch(input: string | URL | Request, init?: RequestInit): Promise<Response>(url(parameter) url: string, { signal(property) RequestInit.signal?: AbortSignal | null | undefinedAn AbortSignal to set request's signal. }), url(parameter) url: string)
  const tickconst tick: number = callbackfunction callback<number, never, []>(register: (args_0: Resume<number, never>, args_1: AbortSignal) => void | (() => void)): number!!An escape hatch: its first argument is self-contained TypeScript (D229).Runs here and returns number.<number>((resume(parameter) resume: Resume<number, never>) => {
    const timerconst timer: NodeJS.Timeout = setTimeoutfunction setTimeout<[]>(callback: () => void, delay?: number): NodeJS.Timeout
namespace setTimeout(() => resume(parameter) resume: (value: number) => voidSucceeds with value.(7), 10)
    return () => clearTimeoutfunction clearTimeout(timeout: NodeJS.Timeout | string | number | undefined): void(timerconst timer: NodeJS.Timeout)
  })
  const nameconst name: string = syncfunction sync<string, [(id: string) => string!NotFound!]>(evaluate: (args_0: (id: string) => string!NotFound!, args_1: AbortSignal) => PromiseLike<string>, args_0: (id: string) => string!NotFound!): string!!An escape hatch: its first argument is self-contained TypeScript (D229). Inputs, which fill its first parameters: greetUser.Runs here and returns string.(async (greet(parameter) greet: (id: string) => string!NotFound!) => runPromise(alias) const runPromise: <string, NotFound>(effect: string!NotFound!, options?: RunOptions | undefined) => Promise<string>Executes an effect and returns the result as a Promise.(greet(parameter) greet: (id: string) => string!NotFound!("1")), greetUser(alias) function greetUser(id: string): string!NotFound!)
  return { id(property) id: `${string}-${string}-${string}-${string}-${string}`, parsed(property) parsed: any, loaded(property) loaded: number, status(property) status: number: fetchedconst fetched: Response.status(property) Response.status: numberThe status read-only property of the Response interface contains the HTTP status codes of the response., tick(property) tick: number, name(property) name: string }
}
// Output: Hello, Ada
// Output: {"id":true,"parsed":{"ok":true},"loaded":42,"status":200,"tick":7,"name":"Ada"}

// run: Console.log(JSON.stringify(both()))
function bothfunction both(): (number | User)[]!NotFound!() {
  const userconst user: Fiber<User, NotFound> = forkconst fork: <User!NotFound!>(effectOrOptions?: (User!NotFound!) | undefined, options?: {
    readonly startImmediately?: boolean | undefined;
    readonly uninterruptible?: boolean | "inherit" | undefined;
} | undefined) => Fiber<User, NotFound>!!ScopeRuns here and returns Fiber<User, NotFound>.The prelude's fork, for TypeScript callers and type positions. getUser(alias) function getUser(id: string): User!NotFound!Passed by name to fork as a program: it runs when that program runs, not here, and returns User.("1")
  const ordersconst orders: Fiber<number, never> = forkconst fork: <number!!>(effectOrOptions?: (number!!) | undefined, options?: {
    readonly startImmediately?: boolean | undefined;
    readonly uninterruptible?: boolean | "inherit" | undefined;
} | undefined) => Fiber<number, never>!!ScopeRuns here and returns Fiber<number, never>.The prelude's fork, for TypeScript callers and type positions. getOrdersfunction getOrders(id: string): numberPlain JavaScript: VibeLang code calls it directly. TypeScript callers see Effect<number, never, never>.("1")
  return [joinjoinJoins the fiber, or every fiber of the array or object, keeping the shape (Fiber.join), and returns User. A failure interrupts the rest. Its failures propagate: NotFound. userconst user: Fiber<User, NotFound>, joinjoinJoins the fiber, or every fiber of the array or object, keeping the shape (Fiber.join), and returns number. A failure interrupts the rest. ordersconst orders: Fiber<number, never>]
}
// Output: [{"id":"1","name":"Ada"},1]

// run: Console.log(JSON.stringify(many()))
function manyfunction many(): {
    user: User;
    orders: number;
    pair: {
        user: User;
        orders: number;
    };
}!NotFound!() {
  const [userconst user: User, ordersconst orders: number] = await.allawait.allStarts each program in its own fiber and waits for all of them, keeping the shape (Effect.all, unbounded). A failure interrupts the rest. Returns [User, number]. Its failures propagate: NotFound. [getUser(alias) function getUser(id: string): User!NotFound!Passed by name to $awaitAll as a program: it runs when that program runs, not here, and returns User.("1"), getOrdersfunction getOrders(id: string): numberPlain JavaScript: VibeLang code calls it directly. TypeScript callers see Effect<number, never, never>.("1")]
  const pairconst pair: {
    user: User;
    orders: number;
} = await.allawait.allStarts each program in its own fiber and waits for all of them, keeping the shape (Effect.all, unbounded). A failure interrupts the rest. Returns { user: User; orders: number; }. Its failures propagate: NotFound. { user(property) user: User!NotFound!: getUser(alias) function getUser(id: string): User!NotFound!Passed by name to $awaitAll as a program: it runs when that program runs, not here, and returns User.("1"), orders(property) orders: number!!: getOrdersfunction getOrders(id: string): numberPlain JavaScript: VibeLang code calls it directly. TypeScript callers see Effect<number, never, never>.("1") }
  return { user(property) user: User, orders(property) orders: number, pair(property) pair: {
    user: User;
    orders: number;
} }
}
// Output: {"user":{"id":"1","name":"Ada"},"orders":1,"pair":{"user":{"id":"1","name":"Ada"},"orders":1}}

// run: const value = outcomes(); Console.log(value.fastest.name); Console.log(JSON.stringify(value.results.map((result) => result._tag))); Console.log(JSON.stringify((await.allSettled [getUser("missing"), getOrders("1")]).map((result) => result._tag))); Console.log(Exit.isFailure(exit(await.allSettled [die("defect"), getOrders("1")])))
function outcomesfunction outcomes(): {
    fastest: User;
    results: [Result<User, NotFound>, Result<number, never>];
}!NotFound!() {
  const fastestconst fastest: User = await.any [getUser(alias) function getUser(id: string): User!NotFound!Passed by name to $awaitAny as a program: it runs when that program runs, not here, and returns User.("1"), getUser(alias) function getUser(id: string): User!NotFound!Passed by name to $awaitAny as a program: it runs when that program runs, not here, and returns User.("2")]
  const resultsconst results: [Result<User, NotFound>, Result<number, never>] = await.allSettledawait.allSettledStarts each program in its own fiber and waits for all of them, returning each outcome as a Result (Effect.all with mode "result"). It never fails. Returns [Result<User, NotFound>, Result<number, never>]. [getUser(alias) function getUser(id: string): User!NotFound!Passed by name to $awaitAllSettled as a program: it runs when that program runs, not here, and returns User.("1"), getOrdersfunction getOrders(id: string): numberPlain JavaScript: VibeLang code calls it directly. TypeScript callers see Effect<number, never, never>.("1")]
  return { fastest(property) fastest: User, results(property) results: [Result<User, NotFound>, Result<number, never>] }
}
// Output: Ada
// Output: ["Success","Success"]
// Output: ["Failure","Success"]
// Output: true

// run: provide Logger.layer([]) { Console.log(withHeartbeat().name) }
function withHeartbeatfunction withHeartbeat(): User!NotFound!() {
  forkconst fork: <!!>(effectOrOptions?: (!!) | undefined, options?: {
    readonly startImmediately?: boolean | undefined;
    readonly uninterruptible?: boolean | "inherit" | undefined;
} | undefined) => Fiber<never, never>!!ScopeRuns here and returns Fiber<never, never>.The prelude's fork, for TypeScript callers and type positions. {
    while (true) {
      logconst log: (...message: ReadonlyArray<any>) => void!!Runs here and returns void.Logs one or more messages using the default log level.("tick")
      sleepconst sleep: (duration: Duration.Input) => void!!Runs here and returns void.Returns an effect that suspends the current fiber for the specified duration
without blocking a JavaScript thread.("1 second")
    }
  }
  return getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.("1")
}
// Output: Ada

// run: Console.log(Exit.isFailure(Fiber.await(background())))
function backgroundfunction background(): Fiber<User, NotFound>!!() {
  detachconst detach: <User, NotFound, never>(program: User!NotFound!) => Fiber<User, NotFound>!!Runs here and returns Fiber<User, NotFound>.D170: starts a program in a fiber that nothing owns (Effect.forkDetach).(getUser(alias) function getUser(id: string): User!NotFound!Passed by name to detach as a program: it runs when that program runs, not here, and returns User.("1"))
  const scopeconst scope: Closeable = Scope(alias) module "effect/Scope".makeconst make: (finalizerStrategy?: "sequential" | "parallel") => Closeable!!Runs here and returns Closeable.Creates a new Scope with the specified finalizer strategy.()
  const fiberconst fiber: Fiber<User, NotFound> = forkInconst forkIn: <User, NotFound, never>(scope: Scope, program: User!NotFound!) => Fiber<User, NotFound>!!Runs here and returns Fiber<User, NotFound>.D170: starts a program in a fiber that scope owns (Effect.forkIn).(scopeconst scope: Closeable, getUser(alias) function getUser(id: string): User!NotFound!Passed by name to forkIn as a program: it runs when that program runs, not here, and returns User.("2"))
  Scope(alias) module "effect/Scope".closeconst close: <void, never>(self: Closeable, exit: Exit<void, never>) => void!!Runs here and returns void.Closes a scope and runs its registered finalizers.(scopeconst scope: Closeable, Exit(alias) module "effect/Exit".void(alias) const void_: Exit<void, never>)
  return fiberconst fiber: Fiber<User, NotFound>
}
// Output: true

// run: Console.log(signal())
function signalfunction signal(): string!!() {
  const readyconst ready: Deferred<string, never> = Deferred(alias) module "effect/Deferred".makeconst make: <string, never>() => Deferred<string, never>!!Runs here and returns Deferred<string, never>.Creates a new Deferred.<string>()
  Deferred(alias) module "effect/Deferred".succeedconst succeed: <string, never>(self: Deferred<string, never>, value: string) => boolean!!Runs here and returns boolean.Attempts to complete the Deferred with the specified value.(readyconst ready: Deferred<string, never>, "go")
  return readyconst ready: Deferred<string, never>.await(property) await: <string, never>(self: Deferred<string, never>) => string!!Method syntax: calls Deferred.await(ready, …).Runs here and returns string.()
}
// Output: go

// run: Console.log(next())
function nextfunction next(): string!!() {
  const jobsconst jobs: Queue<string, never> = Queue(alias) module "effect/Queue".unboundedconst unbounded: <string, never>() => Queue<string, never>!!Runs here and returns Queue<string, never>.Creates an unbounded queue that can grow to any size without blocking producers.<string>()
  Queue(alias) module "effect/Queue".offerconst offer: <string, never>(self: Enqueue<string, never>, message: string) => boolean!!Runs here and returns boolean.Adds a message to the queue. Returns false if the queue is done.(jobsconst jobs: Queue<string, never>, "build")
  return await.raceawait.raceStarts each program in its own fiber; the first to finish wins, success or failure, and the others are interrupted (Effect.raceFirst). Returns string. [
    `ran ${Queue(alias) module "effect/Queue".takeconst take: <string, never>(self: Dequeue<string, never>) => string!!Passed by name to $awaitRace as a program: it runs when that program runs, not here, and returns string.Takes a single message from the queue, or wait for a message to be
available.(jobsconst jobs: Queue<string, never>)}`,
    do {
      sleepconst sleep: (duration: Duration.Input) => void!!Runs here and returns void.Returns an effect that suspends the current fiber for the specified duration
without blocking a JavaScript thread.("1 second")
      "timeout"
    }
  ]
}
// Output: ran build

// run: Effect.provide(logAll(["1", "2"]), Logger.layer([sync(() => Logger.make(({ message }) => console.log(...(message as unknown[]))))]))
function logAllfunction logAll(ids: string[]): void!NotFound!(ids(parameter) ids: string[]: string[]) {
  for concurrentfor concurrentRuns the body for each item in its own fiber and joins them all before the loop ends; a failure interrupts the rest.(8) (const id(parameter) id: string of ids(parameter) ids: string[]) logconst log: (...message: ReadonlyArray<any>) => void!!Runs here and returns void.Logs one or more messages using the default log level.(getUser(alias) function getUser(id: string): User!NotFound!Runs here and returns User.(id(parameter) id: string).name(property) User.name: string)
}
// Output: Ada
// Output: Ada