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Discard union types before considering weak type checks on unit-like types #50423
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| //// [weakTypesAndLiterals01.ts] | ||
| type WeakTypes = | ||
| | { optional?: true; } | ||
| | { toLowerCase?(): string } | ||
| | { toUpperCase?(): string, otherOptionalProp?: number }; | ||
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| type LiteralsOrWeakTypes = | ||
| | "A" | ||
| | "B" | ||
| | WeakTypes; | ||
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| declare let aOrB: "A" | "B"; | ||
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| const f = (arg: LiteralsOrWeakTypes) => { | ||
| if (arg === "A") { | ||
| return arg; | ||
| } | ||
| else { | ||
| return arg; | ||
| } | ||
| } | ||
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| const g = (arg: WeakTypes) => { | ||
| if (arg === "A") { | ||
| return arg; | ||
| } | ||
| else { | ||
| return arg; | ||
| } | ||
| } | ||
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| const h = (arg: LiteralsOrWeakTypes) => { | ||
| if (arg === aOrB) { | ||
| return arg; | ||
| } | ||
| else { | ||
| return arg; | ||
| } | ||
| } | ||
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| const i = (arg: WeakTypes) => { | ||
| if (arg === aOrB) { | ||
| return arg; | ||
| } | ||
| else { | ||
| return arg; | ||
| } | ||
| } | ||
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| //// [weakTypesAndLiterals01.d.ts] | ||
| type WeakTypes = { | ||
| optional?: true; | ||
| } | { | ||
| toLowerCase?(): string; | ||
| } | { | ||
| toUpperCase?(): string; | ||
| otherOptionalProp?: number; | ||
| }; | ||
| type LiteralsOrWeakTypes = "A" | "B" | WeakTypes; | ||
| declare let aOrB: "A" | "B"; | ||
| declare const f: (arg: LiteralsOrWeakTypes) => WeakTypes | "A" | "B"; | ||
| declare const g: (arg: WeakTypes) => WeakTypes; | ||
| declare const h: (arg: LiteralsOrWeakTypes) => LiteralsOrWeakTypes; | ||
| declare const i: (arg: WeakTypes) => WeakTypes; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| === tests/cases/conformance/types/typeRelationships/comparable/weakTypesAndLiterals01.ts === | ||
| type WeakTypes = | ||
| >WeakTypes : Symbol(WeakTypes, Decl(weakTypesAndLiterals01.ts, 0, 0)) | ||
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| | { optional?: true; } | ||
| >optional : Symbol(optional, Decl(weakTypesAndLiterals01.ts, 1, 7)) | ||
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| | { toLowerCase?(): string } | ||
| >toLowerCase : Symbol(toLowerCase, Decl(weakTypesAndLiterals01.ts, 2, 7)) | ||
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| | { toUpperCase?(): string, otherOptionalProp?: number }; | ||
| >toUpperCase : Symbol(toUpperCase, Decl(weakTypesAndLiterals01.ts, 3, 7)) | ||
| >otherOptionalProp : Symbol(otherOptionalProp, Decl(weakTypesAndLiterals01.ts, 3, 31)) | ||
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| type LiteralsOrWeakTypes = | ||
| >LiteralsOrWeakTypes : Symbol(LiteralsOrWeakTypes, Decl(weakTypesAndLiterals01.ts, 3, 61)) | ||
|
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| | "A" | ||
| | "B" | ||
| | WeakTypes; | ||
| >WeakTypes : Symbol(WeakTypes, Decl(weakTypesAndLiterals01.ts, 0, 0)) | ||
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| declare let aOrB: "A" | "B"; | ||
| >aOrB : Symbol(aOrB, Decl(weakTypesAndLiterals01.ts, 10, 11)) | ||
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| const f = (arg: LiteralsOrWeakTypes) => { | ||
| >f : Symbol(f, Decl(weakTypesAndLiterals01.ts, 12, 5)) | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 12, 11)) | ||
| >LiteralsOrWeakTypes : Symbol(LiteralsOrWeakTypes, Decl(weakTypesAndLiterals01.ts, 3, 61)) | ||
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| if (arg === "A") { | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 12, 11)) | ||
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| return arg; | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 12, 11)) | ||
| } | ||
| else { | ||
| return arg; | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 12, 11)) | ||
| } | ||
| } | ||
|
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| const g = (arg: WeakTypes) => { | ||
| >g : Symbol(g, Decl(weakTypesAndLiterals01.ts, 21, 5)) | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 21, 11)) | ||
| >WeakTypes : Symbol(WeakTypes, Decl(weakTypesAndLiterals01.ts, 0, 0)) | ||
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| if (arg === "A") { | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 21, 11)) | ||
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| return arg; | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 21, 11)) | ||
| } | ||
| else { | ||
| return arg; | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 21, 11)) | ||
| } | ||
| } | ||
|
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| const h = (arg: LiteralsOrWeakTypes) => { | ||
| >h : Symbol(h, Decl(weakTypesAndLiterals01.ts, 30, 5)) | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 30, 11)) | ||
| >LiteralsOrWeakTypes : Symbol(LiteralsOrWeakTypes, Decl(weakTypesAndLiterals01.ts, 3, 61)) | ||
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| if (arg === aOrB) { | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 30, 11)) | ||
| >aOrB : Symbol(aOrB, Decl(weakTypesAndLiterals01.ts, 10, 11)) | ||
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| return arg; | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 30, 11)) | ||
| } | ||
| else { | ||
| return arg; | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 30, 11)) | ||
| } | ||
| } | ||
|
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| const i = (arg: WeakTypes) => { | ||
| >i : Symbol(i, Decl(weakTypesAndLiterals01.ts, 39, 5)) | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 39, 11)) | ||
| >WeakTypes : Symbol(WeakTypes, Decl(weakTypesAndLiterals01.ts, 0, 0)) | ||
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| if (arg === aOrB) { | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 39, 11)) | ||
| >aOrB : Symbol(aOrB, Decl(weakTypesAndLiterals01.ts, 10, 11)) | ||
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| return arg; | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 39, 11)) | ||
| } | ||
| else { | ||
| return arg; | ||
| >arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 39, 11)) | ||
| } | ||
| } | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| === tests/cases/conformance/types/typeRelationships/comparable/weakTypesAndLiterals01.ts === | ||
| type WeakTypes = | ||
| >WeakTypes : { optional?: true | undefined; } | { toLowerCase?(): string; } | { toUpperCase?(): string; otherOptionalProp?: number | undefined; } | ||
|
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| | { optional?: true; } | ||
| >optional : true | undefined | ||
| >true : true | ||
|
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| | { toLowerCase?(): string } | ||
| >toLowerCase : (() => string) | undefined | ||
|
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| | { toUpperCase?(): string, otherOptionalProp?: number }; | ||
| >toUpperCase : (() => string) | undefined | ||
| >otherOptionalProp : number | undefined | ||
|
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| type LiteralsOrWeakTypes = | ||
| >LiteralsOrWeakTypes : WeakTypes | "A" | "B" | ||
|
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| | "A" | ||
| | "B" | ||
| | WeakTypes; | ||
|
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| declare let aOrB: "A" | "B"; | ||
| >aOrB : "A" | "B" | ||
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| const f = (arg: LiteralsOrWeakTypes) => { | ||
| >f : (arg: LiteralsOrWeakTypes) => WeakTypes | "A" | "B" | ||
| >(arg: LiteralsOrWeakTypes) => { if (arg === "A") { return arg; } else { return arg; }} : (arg: LiteralsOrWeakTypes) => WeakTypes | "A" | "B" | ||
| >arg : LiteralsOrWeakTypes | ||
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| if (arg === "A") { | ||
| >arg === "A" : boolean | ||
| >arg : LiteralsOrWeakTypes | ||
| >"A" : "A" | ||
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| return arg; | ||
| >arg : { toLowerCase?(): string; } | { toUpperCase?(): string; otherOptionalProp?: number | undefined; } | "A" | ||
| } | ||
| else { | ||
| return arg; | ||
| >arg : WeakTypes | "B" | ||
| } | ||
| } | ||
|
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| const g = (arg: WeakTypes) => { | ||
| >g : (arg: WeakTypes) => WeakTypes | ||
| >(arg: WeakTypes) => { if (arg === "A") { return arg; } else { return arg; }} : (arg: WeakTypes) => WeakTypes | ||
| >arg : WeakTypes | ||
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| if (arg === "A") { | ||
| >arg === "A" : boolean | ||
| >arg : WeakTypes | ||
| >"A" : "A" | ||
|
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| return arg; | ||
| >arg : { toLowerCase?(): string; } | { toUpperCase?(): string; otherOptionalProp?: number | undefined; } | ||
| } | ||
| else { | ||
| return arg; | ||
| >arg : WeakTypes | ||
| } | ||
| } | ||
|
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| const h = (arg: LiteralsOrWeakTypes) => { | ||
| >h : (arg: LiteralsOrWeakTypes) => LiteralsOrWeakTypes | ||
| >(arg: LiteralsOrWeakTypes) => { if (arg === aOrB) { return arg; } else { return arg; }} : (arg: LiteralsOrWeakTypes) => LiteralsOrWeakTypes | ||
| >arg : LiteralsOrWeakTypes | ||
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| if (arg === aOrB) { | ||
| >arg === aOrB : boolean | ||
| >arg : LiteralsOrWeakTypes | ||
| >aOrB : "A" | "B" | ||
|
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| return arg; | ||
| >arg : { toLowerCase?(): string; } | { toUpperCase?(): string; otherOptionalProp?: number | undefined; } | "A" | "B" | ||
| } | ||
| else { | ||
| return arg; | ||
| >arg : LiteralsOrWeakTypes | ||
| } | ||
| } | ||
|
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| const i = (arg: WeakTypes) => { | ||
| >i : (arg: WeakTypes) => WeakTypes | ||
| >(arg: WeakTypes) => { if (arg === aOrB) { return arg; } else { return arg; }} : (arg: WeakTypes) => WeakTypes | ||
| >arg : WeakTypes | ||
|
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| if (arg === aOrB) { | ||
| >arg === aOrB : boolean | ||
| >arg : WeakTypes | ||
| >aOrB : "A" | "B" | ||
|
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| return arg; | ||
| >arg : { toLowerCase?(): string; } | { toUpperCase?(): string; otherOptionalProp?: number | undefined; } | ||
| } | ||
| else { | ||
| return arg; | ||
| >arg : WeakTypes | ||
| } | ||
| } | ||
|
|
51 changes: 51 additions & 0 deletions
51
tests/cases/conformance/types/typeRelationships/comparable/weakTypesAndLiterals01.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| // @strict: true | ||
| // @declaration: true | ||
| // @emitDeclarationOnly: true | ||
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| type WeakTypes = | ||
| | { optional?: true; } | ||
| | { toLowerCase?(): string } | ||
| | { toUpperCase?(): string, otherOptionalProp?: number }; | ||
|
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| type LiteralsOrWeakTypes = | ||
| | "A" | ||
| | "B" | ||
| | WeakTypes; | ||
|
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| declare let aOrB: "A" | "B"; | ||
|
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| const f = (arg: LiteralsOrWeakTypes) => { | ||
| if (arg === "A") { | ||
| return arg; | ||
| } | ||
| else { | ||
| return arg; | ||
| } | ||
| } | ||
|
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| const g = (arg: WeakTypes) => { | ||
| if (arg === "A") { | ||
| return arg; | ||
| } | ||
| else { | ||
| return arg; | ||
| } | ||
| } | ||
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| const h = (arg: LiteralsOrWeakTypes) => { | ||
| if (arg === aOrB) { | ||
| return arg; | ||
| } | ||
| else { | ||
| return arg; | ||
| } | ||
| } | ||
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| const i = (arg: WeakTypes) => { | ||
| if (arg === aOrB) { | ||
| return arg; | ||
| } | ||
| else { | ||
| return arg; | ||
| } | ||
| } |
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I think this is equivalent
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Are enums unit types?
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They are
#51140 (comment)