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| 1 | +//// [tests/cases/compiler/issue55217.ts] //// |
| 2 | + |
| 3 | +=== types.ts === |
| 4 | +export type ProductName = 'a' | 'b' |
| 5 | +>ProductName : Symbol(ProductName, Decl(types.ts, 0, 0)) |
| 6 | + |
| 7 | +export type SubproductNameForProductName<P extends ProductName> = P extends unknown |
| 8 | +>SubproductNameForProductName : Symbol(SubproductNameForProductName, Decl(types.ts, 0, 35)) |
| 9 | +>P : Symbol(P, Decl(types.ts, 2, 41)) |
| 10 | +>ProductName : Symbol(ProductName, Decl(types.ts, 0, 0)) |
| 11 | +>P : Symbol(P, Decl(types.ts, 2, 41)) |
| 12 | + |
| 13 | + ? keyof EntitiesByProductName[P] |
| 14 | +>EntitiesByProductName : Symbol(EntitiesByProductName, Decl(types.ts, 4, 9)) |
| 15 | +>P : Symbol(P, Decl(types.ts, 2, 41)) |
| 16 | + |
| 17 | + : never |
| 18 | + |
| 19 | +type EntitiesByProductName = { |
| 20 | +>EntitiesByProductName : Symbol(EntitiesByProductName, Decl(types.ts, 4, 9)) |
| 21 | + |
| 22 | + a: { a1: { value: 'a-a1' } } |
| 23 | +>a : Symbol(a, Decl(types.ts, 6, 30)) |
| 24 | +>a1 : Symbol(a1, Decl(types.ts, 7, 6)) |
| 25 | +>value : Symbol(value, Decl(types.ts, 7, 12)) |
| 26 | + |
| 27 | + b: { b1: { value: 'b-b1' } } |
| 28 | +>b : Symbol(b, Decl(types.ts, 7, 30)) |
| 29 | +>b1 : Symbol(b1, Decl(types.ts, 8, 6)) |
| 30 | +>value : Symbol(value, Decl(types.ts, 8, 12)) |
| 31 | +} |
| 32 | + |
| 33 | +export type DiscriminatedUnion< |
| 34 | +>DiscriminatedUnion : Symbol(DiscriminatedUnion, Decl(types.ts, 9, 1)) |
| 35 | + |
| 36 | + P extends ProductName = ProductName, |
| 37 | +>P : Symbol(P, Decl(types.ts, 11, 31)) |
| 38 | +>ProductName : Symbol(ProductName, Decl(types.ts, 0, 0)) |
| 39 | +>ProductName : Symbol(ProductName, Decl(types.ts, 0, 0)) |
| 40 | + |
| 41 | + E extends SubproductNameForProductName<P> = SubproductNameForProductName<P>, |
| 42 | +>E : Symbol(E, Decl(types.ts, 12, 38)) |
| 43 | +>SubproductNameForProductName : Symbol(SubproductNameForProductName, Decl(types.ts, 0, 35)) |
| 44 | +>P : Symbol(P, Decl(types.ts, 11, 31)) |
| 45 | +>SubproductNameForProductName : Symbol(SubproductNameForProductName, Decl(types.ts, 0, 35)) |
| 46 | +>P : Symbol(P, Decl(types.ts, 11, 31)) |
| 47 | + |
| 48 | +> = P extends ProductName |
| 49 | +>P : Symbol(P, Decl(types.ts, 11, 31)) |
| 50 | +>ProductName : Symbol(ProductName, Decl(types.ts, 0, 0)) |
| 51 | + |
| 52 | + ? E extends SubproductNameForProductName<P> |
| 53 | +>E : Symbol(E, Decl(types.ts, 12, 38)) |
| 54 | +>SubproductNameForProductName : Symbol(SubproductNameForProductName, Decl(types.ts, 0, 35)) |
| 55 | +>P : Symbol(P, Decl(types.ts, 11, 31)) |
| 56 | + |
| 57 | + // ? E extends unknown // With unknown, the exception doesn't happen. |
| 58 | + ? EntitiesByProductName[P][E] |
| 59 | +>EntitiesByProductName : Symbol(EntitiesByProductName, Decl(types.ts, 4, 9)) |
| 60 | +>P : Symbol(P, Decl(types.ts, 11, 31)) |
| 61 | +>E : Symbol(E, Decl(types.ts, 12, 38)) |
| 62 | + |
| 63 | + : never |
| 64 | + : never |
| 65 | + |
| 66 | +=== app.ts === |
| 67 | +import { SubproductNameForProductName, DiscriminatedUnion, ProductName } from './types' |
| 68 | +>SubproductNameForProductName : Symbol(SubproductNameForProductName, Decl(app.ts, 0, 8)) |
| 69 | +>DiscriminatedUnion : Symbol(DiscriminatedUnion, Decl(app.ts, 0, 38)) |
| 70 | +>ProductName : Symbol(ProductName, Decl(app.ts, 0, 58)) |
| 71 | + |
| 72 | +export const bug = <P extends ProductName>() => { |
| 73 | +>bug : Symbol(bug, Decl(app.ts, 2, 12)) |
| 74 | +>P : Symbol(P, Decl(app.ts, 2, 20)) |
| 75 | +>ProductName : Symbol(ProductName, Decl(app.ts, 0, 58)) |
| 76 | + |
| 77 | + const subproducts: DiscriminatedUnion<P, SubproductNameForProductName<P>>[] = [] |
| 78 | +>subproducts : Symbol(subproducts, Decl(app.ts, 3, 7)) |
| 79 | +>DiscriminatedUnion : Symbol(DiscriminatedUnion, Decl(app.ts, 0, 38)) |
| 80 | +>P : Symbol(P, Decl(app.ts, 2, 20)) |
| 81 | +>SubproductNameForProductName : Symbol(SubproductNameForProductName, Decl(app.ts, 0, 8)) |
| 82 | +>P : Symbol(P, Decl(app.ts, 2, 20)) |
| 83 | + |
| 84 | + subproducts.map((_: DiscriminatedUnion) => null) |
| 85 | +>subproducts.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --)) |
| 86 | +>subproducts : Symbol(subproducts, Decl(app.ts, 3, 7)) |
| 87 | +>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --)) |
| 88 | +>_ : Symbol(_, Decl(app.ts, 4, 19)) |
| 89 | +>DiscriminatedUnion : Symbol(DiscriminatedUnion, Decl(app.ts, 0, 38)) |
| 90 | +} |
| 91 | + |
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