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=== tests/cases/compiler/neverAsDiscriminantType.ts ===
type Foo1 = { kind: 'a', a: number } | { kind: 'b' } | { kind: never };
>Foo1 : { kind: 'a'; a: number; } | { kind: 'b'; } | { kind: never; }
>kind : "a"
>a : number
>kind : "b"
>kind : never
function f1(foo: Foo1) {
>f1 : (foo: Foo1) => void
>foo : Foo1
if (foo.kind === 'a') {
>foo.kind === 'a' : boolean
>foo.kind : "a" | "b"
>foo : Foo1
>kind : "a" | "b"
>'a' : "a"
foo.a;
>foo.a : number
>foo : { kind: "a"; a: number; }
>a : number
}
}
type Foo2 = { kind?: 'a', a: number } | { kind?: 'b' } | { kind?: never };
>Foo2 : { kind?: "a" | undefined; a: number; } | { kind?: "b" | undefined; } | { kind?: undefined; }
>kind : "a" | undefined
>a : number
>kind : "b" | undefined
>kind : undefined
function f2(foo: Foo2) {
>f2 : (foo: Foo2) => void
>foo : Foo2
if (foo.kind === 'a') {
>foo.kind === 'a' : boolean
>foo.kind : "a" | "b" | undefined
>foo : Foo2
>kind : "a" | "b" | undefined
>'a' : "a"
foo.a;
>foo.a : number
>foo : { kind?: "a" | undefined; a: number; }
>a : number
}
}
// Repro from #50716
export interface GatewayPayloadStructure<O extends GatewayOpcode, T extends keyof GatewayEvents, D> {
op: O
>op : O
d: D
>d : D
t?: T
>t : T | undefined
s?: number
>s : number | undefined
}
export type GatewayPayload = {
>GatewayPayload : GatewayPayloadStructure<GatewayOpcode.DISPATCH, "MESSAGE_CREATE", { a: 1; }> | GatewayPayloadStructure<GatewayOpcode.DISPATCH, "MESSAGE_UPDATE", { a: 2; }> | GatewayPayloadStructure<GatewayOpcode.DISPATCH, "MESSAGE_DELETE", { a: 3; }> | GatewayPayloadStructure<GatewayOpcode.HEARTBEAT, never, never> | GatewayPayloadStructure<GatewayOpcode.IDENTIFY, never, never> | GatewayPayloadStructure<GatewayOpcode.PRESENCE_UPDATE, never, never> | GatewayPayloadStructure<GatewayOpcode.VOICE_STATE_UPDATE, never, never> | GatewayPayloadStructure<GatewayOpcode.RESUME, never, never> | GatewayPayloadStructure<GatewayOpcode.RECONNECT, never, never> | GatewayPayloadStructure<GatewayOpcode.REQUEST_GUILD_MEMBERS, never, never> | GatewayPayloadStructure<GatewayOpcode.INVALID_SESSION, never, never> | GatewayPayloadStructure<GatewayOpcode.HELLO, never, { b: 1; }> | GatewayPayloadStructure<GatewayOpcode.HEARTBEAT_ACK, never, never>
[O in GatewayOpcode]: O extends GatewayOpcode.DISPATCH
>GatewayOpcode : any
? {
[T in keyof GatewayEvents]: GatewayPayloadStructure<GatewayOpcode.DISPATCH, T, GatewayEvents[T]>
>GatewayOpcode : any
}[keyof GatewayEvents]
: GatewayPayloadStructure<O, never, O extends keyof GatewayParams ? GatewayParams[O] : never>
}[GatewayOpcode]
export interface GatewayParams {
[GatewayOpcode.HELLO]: { b: 1 }
>[GatewayOpcode.HELLO] : { b: 1; }
>GatewayOpcode.HELLO : GatewayOpcode.HELLO
>GatewayOpcode : typeof GatewayOpcode
>HELLO : GatewayOpcode.HELLO
>b : 1
}
export enum GatewayOpcode {
>GatewayOpcode : GatewayOpcode
DISPATCH = 0,
>DISPATCH : GatewayOpcode.DISPATCH
>0 : 0
HEARTBEAT = 1,
>HEARTBEAT : GatewayOpcode.HEARTBEAT
>1 : 1
IDENTIFY = 2,
>IDENTIFY : GatewayOpcode.IDENTIFY
>2 : 2
PRESENCE_UPDATE = 3,
>PRESENCE_UPDATE : GatewayOpcode.PRESENCE_UPDATE
>3 : 3
VOICE_STATE_UPDATE = 4,
>VOICE_STATE_UPDATE : GatewayOpcode.VOICE_STATE_UPDATE
>4 : 4
RESUME = 6,
>RESUME : GatewayOpcode.RESUME
>6 : 6
RECONNECT = 7,
>RECONNECT : GatewayOpcode.RECONNECT
>7 : 7
REQUEST_GUILD_MEMBERS = 8,
>REQUEST_GUILD_MEMBERS : GatewayOpcode.REQUEST_GUILD_MEMBERS
>8 : 8
INVALID_SESSION = 9,
>INVALID_SESSION : GatewayOpcode.INVALID_SESSION
>9 : 9
HELLO = 10,
>HELLO : GatewayOpcode.HELLO
>10 : 10
HEARTBEAT_ACK = 11,
>HEARTBEAT_ACK : GatewayOpcode.HEARTBEAT_ACK
>11 : 11
}
export interface GatewayEvents {
MESSAGE_CREATE: { a: 1 }
>MESSAGE_CREATE : { a: 1; }
>a : 1
MESSAGE_UPDATE: { a: 2 }
>MESSAGE_UPDATE : { a: 2; }
>a : 2
MESSAGE_DELETE: { a: 3 }
>MESSAGE_DELETE : { a: 3; }
>a : 3
}
function assertMessage(event: { a: 1 }) { }
>assertMessage : (event: { a: 1;}) => void
>event : { a: 1; }
>a : 1
export async function adaptSession(input: GatewayPayload) {
>adaptSession : (input: GatewayPayload) => Promise<void>
>input : GatewayPayload
if (input.t === 'MESSAGE_CREATE') {
>input.t === 'MESSAGE_CREATE' : boolean
>input.t : "MESSAGE_CREATE" | "MESSAGE_UPDATE" | "MESSAGE_DELETE" | undefined
>input : GatewayPayload
>t : "MESSAGE_CREATE" | "MESSAGE_UPDATE" | "MESSAGE_DELETE" | undefined
>'MESSAGE_CREATE' : "MESSAGE_CREATE"
assertMessage(input.d)
>assertMessage(input.d) : void
>assertMessage : (event: { a: 1; }) => void
>input.d : { a: 1; }
>input : GatewayPayloadStructure<GatewayOpcode.DISPATCH, "MESSAGE_CREATE", { a: 1; }>
>d : { a: 1; }
}
}
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