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Discriminant of type
never
should never be matched (#50755)
* Discriminant of type 'never' should never be matched * Add tests
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tests/baselines/reference/neverAsDiscriminantType(strict=false).js
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//// [neverAsDiscriminantType.ts] | ||
type Foo1 = { kind: 'a', a: number } | { kind: 'b' } | { kind: never }; | ||
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function f1(foo: Foo1) { | ||
if (foo.kind === 'a') { | ||
foo.a; | ||
} | ||
} | ||
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type Foo2 = { kind?: 'a', a: number } | { kind?: 'b' } | { kind?: never }; | ||
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function f2(foo: Foo2) { | ||
if (foo.kind === 'a') { | ||
foo.a; | ||
} | ||
} | ||
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// Repro from #50716 | ||
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export interface GatewayPayloadStructure<O extends GatewayOpcode, T extends keyof GatewayEvents, D> { | ||
op: O | ||
d: D | ||
t?: T | ||
s?: number | ||
} | ||
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export type GatewayPayload = { | ||
[O in GatewayOpcode]: O extends GatewayOpcode.DISPATCH | ||
? { | ||
[T in keyof GatewayEvents]: GatewayPayloadStructure<GatewayOpcode.DISPATCH, T, GatewayEvents[T]> | ||
}[keyof GatewayEvents] | ||
: GatewayPayloadStructure<O, never, O extends keyof GatewayParams ? GatewayParams[O] : never> | ||
}[GatewayOpcode] | ||
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export interface GatewayParams { | ||
[GatewayOpcode.HELLO]: { b: 1 } | ||
} | ||
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export enum GatewayOpcode { | ||
DISPATCH = 0, | ||
HEARTBEAT = 1, | ||
IDENTIFY = 2, | ||
PRESENCE_UPDATE = 3, | ||
VOICE_STATE_UPDATE = 4, | ||
RESUME = 6, | ||
RECONNECT = 7, | ||
REQUEST_GUILD_MEMBERS = 8, | ||
INVALID_SESSION = 9, | ||
HELLO = 10, | ||
HEARTBEAT_ACK = 11, | ||
} | ||
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export interface GatewayEvents { | ||
MESSAGE_CREATE: { a: 1 } | ||
MESSAGE_UPDATE: { a: 2 } | ||
MESSAGE_DELETE: { a: 3 } | ||
} | ||
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function assertMessage(event: { a: 1 }) { } | ||
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export async function adaptSession(input: GatewayPayload) { | ||
if (input.t === 'MESSAGE_CREATE') { | ||
assertMessage(input.d) | ||
} | ||
} | ||
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//// [neverAsDiscriminantType.js] | ||
"use strict"; | ||
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) { | ||
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); } | ||
return new (P || (P = Promise))(function (resolve, reject) { | ||
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } } | ||
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } } | ||
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); } | ||
step((generator = generator.apply(thisArg, _arguments || [])).next()); | ||
}); | ||
}; | ||
var __generator = (this && this.__generator) || function (thisArg, body) { | ||
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g; | ||
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g; | ||
function verb(n) { return function (v) { return step([n, v]); }; } | ||
function step(op) { | ||
if (f) throw new TypeError("Generator is already executing."); | ||
while (_) try { | ||
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t; | ||
if (y = 0, t) op = [op[0] & 2, t.value]; | ||
switch (op[0]) { | ||
case 0: case 1: t = op; break; | ||
case 4: _.label++; return { value: op[1], done: false }; | ||
case 5: _.label++; y = op[1]; op = [0]; continue; | ||
case 7: op = _.ops.pop(); _.trys.pop(); continue; | ||
default: | ||
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; } | ||
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; } | ||
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; } | ||
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; } | ||
if (t[2]) _.ops.pop(); | ||
_.trys.pop(); continue; | ||
} | ||
op = body.call(thisArg, _); | ||
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; } | ||
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true }; | ||
} | ||
}; | ||
exports.__esModule = true; | ||
exports.adaptSession = exports.GatewayOpcode = void 0; | ||
function f1(foo) { | ||
if (foo.kind === 'a') { | ||
foo.a; | ||
} | ||
} | ||
function f2(foo) { | ||
if (foo.kind === 'a') { | ||
foo.a; | ||
} | ||
} | ||
var GatewayOpcode; | ||
(function (GatewayOpcode) { | ||
GatewayOpcode[GatewayOpcode["DISPATCH"] = 0] = "DISPATCH"; | ||
GatewayOpcode[GatewayOpcode["HEARTBEAT"] = 1] = "HEARTBEAT"; | ||
GatewayOpcode[GatewayOpcode["IDENTIFY"] = 2] = "IDENTIFY"; | ||
GatewayOpcode[GatewayOpcode["PRESENCE_UPDATE"] = 3] = "PRESENCE_UPDATE"; | ||
GatewayOpcode[GatewayOpcode["VOICE_STATE_UPDATE"] = 4] = "VOICE_STATE_UPDATE"; | ||
GatewayOpcode[GatewayOpcode["RESUME"] = 6] = "RESUME"; | ||
GatewayOpcode[GatewayOpcode["RECONNECT"] = 7] = "RECONNECT"; | ||
GatewayOpcode[GatewayOpcode["REQUEST_GUILD_MEMBERS"] = 8] = "REQUEST_GUILD_MEMBERS"; | ||
GatewayOpcode[GatewayOpcode["INVALID_SESSION"] = 9] = "INVALID_SESSION"; | ||
GatewayOpcode[GatewayOpcode["HELLO"] = 10] = "HELLO"; | ||
GatewayOpcode[GatewayOpcode["HEARTBEAT_ACK"] = 11] = "HEARTBEAT_ACK"; | ||
})(GatewayOpcode = exports.GatewayOpcode || (exports.GatewayOpcode = {})); | ||
function assertMessage(event) { } | ||
function adaptSession(input) { | ||
return __awaiter(this, void 0, void 0, function () { | ||
return __generator(this, function (_a) { | ||
if (input.t === 'MESSAGE_CREATE') { | ||
assertMessage(input.d); | ||
} | ||
return [2 /*return*/]; | ||
}); | ||
}); | ||
} | ||
exports.adaptSession = adaptSession; |
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tests/baselines/reference/neverAsDiscriminantType(strict=false).symbols
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=== tests/cases/compiler/neverAsDiscriminantType.ts === | ||
type Foo1 = { kind: 'a', a: number } | { kind: 'b' } | { kind: never }; | ||
>Foo1 : Symbol(Foo1, Decl(neverAsDiscriminantType.ts, 0, 0)) | ||
>kind : Symbol(kind, Decl(neverAsDiscriminantType.ts, 0, 13)) | ||
>a : Symbol(a, Decl(neverAsDiscriminantType.ts, 0, 24)) | ||
>kind : Symbol(kind, Decl(neverAsDiscriminantType.ts, 0, 40)) | ||
>kind : Symbol(kind, Decl(neverAsDiscriminantType.ts, 0, 56)) | ||
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function f1(foo: Foo1) { | ||
>f1 : Symbol(f1, Decl(neverAsDiscriminantType.ts, 0, 71)) | ||
>foo : Symbol(foo, Decl(neverAsDiscriminantType.ts, 2, 12)) | ||
>Foo1 : Symbol(Foo1, Decl(neverAsDiscriminantType.ts, 0, 0)) | ||
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if (foo.kind === 'a') { | ||
>foo.kind : Symbol(kind, Decl(neverAsDiscriminantType.ts, 0, 13), Decl(neverAsDiscriminantType.ts, 0, 40), Decl(neverAsDiscriminantType.ts, 0, 56)) | ||
>foo : Symbol(foo, Decl(neverAsDiscriminantType.ts, 2, 12)) | ||
>kind : Symbol(kind, Decl(neverAsDiscriminantType.ts, 0, 13), Decl(neverAsDiscriminantType.ts, 0, 40), Decl(neverAsDiscriminantType.ts, 0, 56)) | ||
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foo.a; | ||
>foo.a : Symbol(a, Decl(neverAsDiscriminantType.ts, 0, 24)) | ||
>foo : Symbol(foo, Decl(neverAsDiscriminantType.ts, 2, 12)) | ||
>a : Symbol(a, Decl(neverAsDiscriminantType.ts, 0, 24)) | ||
} | ||
} | ||
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type Foo2 = { kind?: 'a', a: number } | { kind?: 'b' } | { kind?: never }; | ||
>Foo2 : Symbol(Foo2, Decl(neverAsDiscriminantType.ts, 6, 1)) | ||
>kind : Symbol(kind, Decl(neverAsDiscriminantType.ts, 8, 13)) | ||
>a : Symbol(a, Decl(neverAsDiscriminantType.ts, 8, 25)) | ||
>kind : Symbol(kind, Decl(neverAsDiscriminantType.ts, 8, 41)) | ||
>kind : Symbol(kind, Decl(neverAsDiscriminantType.ts, 8, 58)) | ||
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function f2(foo: Foo2) { | ||
>f2 : Symbol(f2, Decl(neverAsDiscriminantType.ts, 8, 74)) | ||
>foo : Symbol(foo, Decl(neverAsDiscriminantType.ts, 10, 12)) | ||
>Foo2 : Symbol(Foo2, Decl(neverAsDiscriminantType.ts, 6, 1)) | ||
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if (foo.kind === 'a') { | ||
>foo.kind : Symbol(kind, Decl(neverAsDiscriminantType.ts, 8, 13), Decl(neverAsDiscriminantType.ts, 8, 41), Decl(neverAsDiscriminantType.ts, 8, 58)) | ||
>foo : Symbol(foo, Decl(neverAsDiscriminantType.ts, 10, 12)) | ||
>kind : Symbol(kind, Decl(neverAsDiscriminantType.ts, 8, 13), Decl(neverAsDiscriminantType.ts, 8, 41), Decl(neverAsDiscriminantType.ts, 8, 58)) | ||
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foo.a; | ||
>foo.a : Symbol(a, Decl(neverAsDiscriminantType.ts, 8, 25)) | ||
>foo : Symbol(foo, Decl(neverAsDiscriminantType.ts, 10, 12)) | ||
>a : Symbol(a, Decl(neverAsDiscriminantType.ts, 8, 25)) | ||
} | ||
} | ||
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// Repro from #50716 | ||
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export interface GatewayPayloadStructure<O extends GatewayOpcode, T extends keyof GatewayEvents, D> { | ||
>GatewayPayloadStructure : Symbol(GatewayPayloadStructure, Decl(neverAsDiscriminantType.ts, 14, 1)) | ||
>O : Symbol(O, Decl(neverAsDiscriminantType.ts, 18, 41)) | ||
>GatewayOpcode : Symbol(GatewayOpcode, Decl(neverAsDiscriminantType.ts, 35, 1)) | ||
>T : Symbol(T, Decl(neverAsDiscriminantType.ts, 18, 65)) | ||
>GatewayEvents : Symbol(GatewayEvents, Decl(neverAsDiscriminantType.ts, 49, 1)) | ||
>D : Symbol(D, Decl(neverAsDiscriminantType.ts, 18, 96)) | ||
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op: O | ||
>op : Symbol(GatewayPayloadStructure.op, Decl(neverAsDiscriminantType.ts, 18, 101)) | ||
>O : Symbol(O, Decl(neverAsDiscriminantType.ts, 18, 41)) | ||
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d: D | ||
>d : Symbol(GatewayPayloadStructure.d, Decl(neverAsDiscriminantType.ts, 19, 9)) | ||
>D : Symbol(D, Decl(neverAsDiscriminantType.ts, 18, 96)) | ||
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t?: T | ||
>t : Symbol(GatewayPayloadStructure.t, Decl(neverAsDiscriminantType.ts, 20, 8)) | ||
>T : Symbol(T, Decl(neverAsDiscriminantType.ts, 18, 65)) | ||
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s?: number | ||
>s : Symbol(GatewayPayloadStructure.s, Decl(neverAsDiscriminantType.ts, 21, 9)) | ||
} | ||
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export type GatewayPayload = { | ||
>GatewayPayload : Symbol(GatewayPayload, Decl(neverAsDiscriminantType.ts, 23, 1)) | ||
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[O in GatewayOpcode]: O extends GatewayOpcode.DISPATCH | ||
>O : Symbol(O, Decl(neverAsDiscriminantType.ts, 26, 5)) | ||
>GatewayOpcode : Symbol(GatewayOpcode, Decl(neverAsDiscriminantType.ts, 35, 1)) | ||
>O : Symbol(O, Decl(neverAsDiscriminantType.ts, 26, 5)) | ||
>GatewayOpcode : Symbol(GatewayOpcode, Decl(neverAsDiscriminantType.ts, 35, 1)) | ||
>DISPATCH : Symbol(GatewayOpcode.DISPATCH, Decl(neverAsDiscriminantType.ts, 37, 27)) | ||
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? { | ||
[T in keyof GatewayEvents]: GatewayPayloadStructure<GatewayOpcode.DISPATCH, T, GatewayEvents[T]> | ||
>T : Symbol(T, Decl(neverAsDiscriminantType.ts, 28, 9)) | ||
>GatewayEvents : Symbol(GatewayEvents, Decl(neverAsDiscriminantType.ts, 49, 1)) | ||
>GatewayPayloadStructure : Symbol(GatewayPayloadStructure, Decl(neverAsDiscriminantType.ts, 14, 1)) | ||
>GatewayOpcode : Symbol(GatewayOpcode, Decl(neverAsDiscriminantType.ts, 35, 1)) | ||
>DISPATCH : Symbol(GatewayOpcode.DISPATCH, Decl(neverAsDiscriminantType.ts, 37, 27)) | ||
>T : Symbol(T, Decl(neverAsDiscriminantType.ts, 28, 9)) | ||
>GatewayEvents : Symbol(GatewayEvents, Decl(neverAsDiscriminantType.ts, 49, 1)) | ||
>T : Symbol(T, Decl(neverAsDiscriminantType.ts, 28, 9)) | ||
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}[keyof GatewayEvents] | ||
>GatewayEvents : Symbol(GatewayEvents, Decl(neverAsDiscriminantType.ts, 49, 1)) | ||
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: GatewayPayloadStructure<O, never, O extends keyof GatewayParams ? GatewayParams[O] : never> | ||
>GatewayPayloadStructure : Symbol(GatewayPayloadStructure, Decl(neverAsDiscriminantType.ts, 14, 1)) | ||
>O : Symbol(O, Decl(neverAsDiscriminantType.ts, 26, 5)) | ||
>O : Symbol(O, Decl(neverAsDiscriminantType.ts, 26, 5)) | ||
>GatewayParams : Symbol(GatewayParams, Decl(neverAsDiscriminantType.ts, 31, 16)) | ||
>GatewayParams : Symbol(GatewayParams, Decl(neverAsDiscriminantType.ts, 31, 16)) | ||
>O : Symbol(O, Decl(neverAsDiscriminantType.ts, 26, 5)) | ||
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}[GatewayOpcode] | ||
>GatewayOpcode : Symbol(GatewayOpcode, Decl(neverAsDiscriminantType.ts, 35, 1)) | ||
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export interface GatewayParams { | ||
>GatewayParams : Symbol(GatewayParams, Decl(neverAsDiscriminantType.ts, 31, 16)) | ||
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[GatewayOpcode.HELLO]: { b: 1 } | ||
>[GatewayOpcode.HELLO] : Symbol(GatewayParams[GatewayOpcode.HELLO], Decl(neverAsDiscriminantType.ts, 33, 32)) | ||
>GatewayOpcode.HELLO : Symbol(GatewayOpcode.HELLO, Decl(neverAsDiscriminantType.ts, 46, 24)) | ||
>GatewayOpcode : Symbol(GatewayOpcode, Decl(neverAsDiscriminantType.ts, 35, 1)) | ||
>HELLO : Symbol(GatewayOpcode.HELLO, Decl(neverAsDiscriminantType.ts, 46, 24)) | ||
>b : Symbol(b, Decl(neverAsDiscriminantType.ts, 34, 28)) | ||
} | ||
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export enum GatewayOpcode { | ||
>GatewayOpcode : Symbol(GatewayOpcode, Decl(neverAsDiscriminantType.ts, 35, 1)) | ||
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DISPATCH = 0, | ||
>DISPATCH : Symbol(GatewayOpcode.DISPATCH, Decl(neverAsDiscriminantType.ts, 37, 27)) | ||
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HEARTBEAT = 1, | ||
>HEARTBEAT : Symbol(GatewayOpcode.HEARTBEAT, Decl(neverAsDiscriminantType.ts, 38, 17)) | ||
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IDENTIFY = 2, | ||
>IDENTIFY : Symbol(GatewayOpcode.IDENTIFY, Decl(neverAsDiscriminantType.ts, 39, 18)) | ||
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PRESENCE_UPDATE = 3, | ||
>PRESENCE_UPDATE : Symbol(GatewayOpcode.PRESENCE_UPDATE, Decl(neverAsDiscriminantType.ts, 40, 17)) | ||
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VOICE_STATE_UPDATE = 4, | ||
>VOICE_STATE_UPDATE : Symbol(GatewayOpcode.VOICE_STATE_UPDATE, Decl(neverAsDiscriminantType.ts, 41, 24)) | ||
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RESUME = 6, | ||
>RESUME : Symbol(GatewayOpcode.RESUME, Decl(neverAsDiscriminantType.ts, 42, 27)) | ||
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RECONNECT = 7, | ||
>RECONNECT : Symbol(GatewayOpcode.RECONNECT, Decl(neverAsDiscriminantType.ts, 43, 15)) | ||
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REQUEST_GUILD_MEMBERS = 8, | ||
>REQUEST_GUILD_MEMBERS : Symbol(GatewayOpcode.REQUEST_GUILD_MEMBERS, Decl(neverAsDiscriminantType.ts, 44, 18)) | ||
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INVALID_SESSION = 9, | ||
>INVALID_SESSION : Symbol(GatewayOpcode.INVALID_SESSION, Decl(neverAsDiscriminantType.ts, 45, 30)) | ||
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HELLO = 10, | ||
>HELLO : Symbol(GatewayOpcode.HELLO, Decl(neverAsDiscriminantType.ts, 46, 24)) | ||
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HEARTBEAT_ACK = 11, | ||
>HEARTBEAT_ACK : Symbol(GatewayOpcode.HEARTBEAT_ACK, Decl(neverAsDiscriminantType.ts, 47, 15)) | ||
} | ||
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export interface GatewayEvents { | ||
>GatewayEvents : Symbol(GatewayEvents, Decl(neverAsDiscriminantType.ts, 49, 1)) | ||
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MESSAGE_CREATE: { a: 1 } | ||
>MESSAGE_CREATE : Symbol(GatewayEvents.MESSAGE_CREATE, Decl(neverAsDiscriminantType.ts, 51, 32)) | ||
>a : Symbol(a, Decl(neverAsDiscriminantType.ts, 52, 21)) | ||
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MESSAGE_UPDATE: { a: 2 } | ||
>MESSAGE_UPDATE : Symbol(GatewayEvents.MESSAGE_UPDATE, Decl(neverAsDiscriminantType.ts, 52, 28)) | ||
>a : Symbol(a, Decl(neverAsDiscriminantType.ts, 53, 21)) | ||
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MESSAGE_DELETE: { a: 3 } | ||
>MESSAGE_DELETE : Symbol(GatewayEvents.MESSAGE_DELETE, Decl(neverAsDiscriminantType.ts, 53, 28)) | ||
>a : Symbol(a, Decl(neverAsDiscriminantType.ts, 54, 21)) | ||
} | ||
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function assertMessage(event: { a: 1 }) { } | ||
>assertMessage : Symbol(assertMessage, Decl(neverAsDiscriminantType.ts, 55, 1)) | ||
>event : Symbol(event, Decl(neverAsDiscriminantType.ts, 57, 23)) | ||
>a : Symbol(a, Decl(neverAsDiscriminantType.ts, 57, 31)) | ||
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export async function adaptSession(input: GatewayPayload) { | ||
>adaptSession : Symbol(adaptSession, Decl(neverAsDiscriminantType.ts, 57, 43)) | ||
>input : Symbol(input, Decl(neverAsDiscriminantType.ts, 59, 35)) | ||
>GatewayPayload : Symbol(GatewayPayload, Decl(neverAsDiscriminantType.ts, 23, 1)) | ||
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if (input.t === 'MESSAGE_CREATE') { | ||
>input.t : Symbol(GatewayPayloadStructure.t, Decl(neverAsDiscriminantType.ts, 20, 8), Decl(neverAsDiscriminantType.ts, 20, 8), Decl(neverAsDiscriminantType.ts, 20, 8), Decl(neverAsDiscriminantType.ts, 20, 8), Decl(neverAsDiscriminantType.ts, 20, 8) ... and 8 more) | ||
>input : Symbol(input, Decl(neverAsDiscriminantType.ts, 59, 35)) | ||
>t : Symbol(GatewayPayloadStructure.t, Decl(neverAsDiscriminantType.ts, 20, 8), Decl(neverAsDiscriminantType.ts, 20, 8), Decl(neverAsDiscriminantType.ts, 20, 8), Decl(neverAsDiscriminantType.ts, 20, 8), Decl(neverAsDiscriminantType.ts, 20, 8) ... and 8 more) | ||
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assertMessage(input.d) | ||
>assertMessage : Symbol(assertMessage, Decl(neverAsDiscriminantType.ts, 55, 1)) | ||
>input.d : Symbol(GatewayPayloadStructure.d, Decl(neverAsDiscriminantType.ts, 19, 9)) | ||
>input : Symbol(input, Decl(neverAsDiscriminantType.ts, 59, 35)) | ||
>d : Symbol(GatewayPayloadStructure.d, Decl(neverAsDiscriminantType.ts, 19, 9)) | ||
} | ||
} | ||
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