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fix(50551): Destructuring assignment with var bypasses "variable is u…
…sed before being assigned" check (2454) (#50560) * fix(50551): handle destructuring variables used before assignment * skip the error in binding elements that refer to the same destructuring * fix binding element type
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39 changes: 39 additions & 0 deletions
39
tests/baselines/reference/controlFlowDestructuringVariablesInTryCatch.errors.txt
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tests/cases/compiler/controlFlowDestructuringVariablesInTryCatch.ts(16,1): error TS2454: Variable 'a' is used before being assigned. | ||
tests/cases/compiler/controlFlowDestructuringVariablesInTryCatch.ts(17,1): error TS2454: Variable 'b' is used before being assigned. | ||
tests/cases/compiler/controlFlowDestructuringVariablesInTryCatch.ts(18,1): error TS2454: Variable 'c' is used before being assigned. | ||
tests/cases/compiler/controlFlowDestructuringVariablesInTryCatch.ts(19,1): error TS2454: Variable 'd' is used before being assigned. | ||
tests/cases/compiler/controlFlowDestructuringVariablesInTryCatch.ts(20,1): error TS2454: Variable 'e' is used before being assigned. | ||
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==== tests/cases/compiler/controlFlowDestructuringVariablesInTryCatch.ts (5 errors) ==== | ||
declare function f1(): string; | ||
declare function f2(): [b: string]; | ||
declare function f3(): { c: string }; | ||
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try { | ||
var a = f1(); | ||
var [b] = f2(); | ||
var { c } = f3(); | ||
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var [d = 1] = []; | ||
var { e = 1 } = { }; | ||
} catch { | ||
console.error("error"); | ||
} | ||
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a; | ||
~ | ||
!!! error TS2454: Variable 'a' is used before being assigned. | ||
b; | ||
~ | ||
!!! error TS2454: Variable 'b' is used before being assigned. | ||
c; | ||
~ | ||
!!! error TS2454: Variable 'c' is used before being assigned. | ||
d; | ||
~ | ||
!!! error TS2454: Variable 'd' is used before being assigned. | ||
e; | ||
~ | ||
!!! error TS2454: Variable 'e' is used before being assigned. | ||
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40 changes: 40 additions & 0 deletions
40
tests/baselines/reference/controlFlowDestructuringVariablesInTryCatch.js
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//// [controlFlowDestructuringVariablesInTryCatch.ts] | ||
declare function f1(): string; | ||
declare function f2(): [b: string]; | ||
declare function f3(): { c: string }; | ||
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try { | ||
var a = f1(); | ||
var [b] = f2(); | ||
var { c } = f3(); | ||
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var [d = 1] = []; | ||
var { e = 1 } = { }; | ||
} catch { | ||
console.error("error"); | ||
} | ||
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a; | ||
b; | ||
c; | ||
d; | ||
e; | ||
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//// [controlFlowDestructuringVariablesInTryCatch.js] | ||
"use strict"; | ||
try { | ||
var a = f1(); | ||
var b = f2()[0]; | ||
var c = f3().c; | ||
var _a = [][0], d = _a === void 0 ? 1 : _a; | ||
var _b = {}.e, e = _b === void 0 ? 1 : _b; | ||
} | ||
catch (_c) { | ||
console.error("error"); | ||
} | ||
a; | ||
b; | ||
c; | ||
d; | ||
e; |
52 changes: 52 additions & 0 deletions
52
tests/baselines/reference/controlFlowDestructuringVariablesInTryCatch.symbols
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=== tests/cases/compiler/controlFlowDestructuringVariablesInTryCatch.ts === | ||
declare function f1(): string; | ||
>f1 : Symbol(f1, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 0, 0)) | ||
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declare function f2(): [b: string]; | ||
>f2 : Symbol(f2, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 0, 30)) | ||
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declare function f3(): { c: string }; | ||
>f3 : Symbol(f3, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 1, 35)) | ||
>c : Symbol(c, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 2, 24)) | ||
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try { | ||
var a = f1(); | ||
>a : Symbol(a, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 5, 7)) | ||
>f1 : Symbol(f1, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 0, 0)) | ||
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var [b] = f2(); | ||
>b : Symbol(b, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 6, 9)) | ||
>f2 : Symbol(f2, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 0, 30)) | ||
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var { c } = f3(); | ||
>c : Symbol(c, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 7, 9)) | ||
>f3 : Symbol(f3, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 1, 35)) | ||
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var [d = 1] = []; | ||
>d : Symbol(d, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 9, 9)) | ||
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var { e = 1 } = { }; | ||
>e : Symbol(e, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 10, 9)) | ||
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} catch { | ||
console.error("error"); | ||
>console.error : Symbol(Console.error, Decl(lib.dom.d.ts, --, --)) | ||
>console : Symbol(console, Decl(lib.dom.d.ts, --, --)) | ||
>error : Symbol(Console.error, Decl(lib.dom.d.ts, --, --)) | ||
} | ||
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a; | ||
>a : Symbol(a, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 5, 7)) | ||
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b; | ||
>b : Symbol(b, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 6, 9)) | ||
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c; | ||
>c : Symbol(c, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 7, 9)) | ||
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d; | ||
>d : Symbol(d, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 9, 9)) | ||
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e; | ||
>e : Symbol(e, Decl(controlFlowDestructuringVariablesInTryCatch.ts, 10, 9)) | ||
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61 changes: 61 additions & 0 deletions
61
tests/baselines/reference/controlFlowDestructuringVariablesInTryCatch.types
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=== tests/cases/compiler/controlFlowDestructuringVariablesInTryCatch.ts === | ||
declare function f1(): string; | ||
>f1 : () => string | ||
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declare function f2(): [b: string]; | ||
>f2 : () => [b: string] | ||
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declare function f3(): { c: string }; | ||
>f3 : () => { c: string; } | ||
>c : string | ||
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try { | ||
var a = f1(); | ||
>a : string | ||
>f1() : string | ||
>f1 : () => string | ||
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var [b] = f2(); | ||
>b : string | ||
>f2() : [b: string] | ||
>f2 : () => [b: string] | ||
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var { c } = f3(); | ||
>c : string | ||
>f3() : { c: string; } | ||
>f3 : () => { c: string; } | ||
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var [d = 1] = []; | ||
>d : number | ||
>1 : 1 | ||
>[] : [] | ||
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var { e = 1 } = { }; | ||
>e : number | ||
>1 : 1 | ||
>{ } : { e?: number | undefined; } | ||
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} catch { | ||
console.error("error"); | ||
>console.error("error") : void | ||
>console.error : (...data: any[]) => void | ||
>console : Console | ||
>error : (...data: any[]) => void | ||
>"error" : "error" | ||
} | ||
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a; | ||
>a : string | ||
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b; | ||
>b : string | ||
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c; | ||
>c : string | ||
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d; | ||
>d : number | ||
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e; | ||
>e : number | ||
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11 changes: 11 additions & 0 deletions
11
tests/baselines/reference/controlFlowInitializedDestructuringVariables.js
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//// [controlFlowInitializedDestructuringVariables.ts] | ||
declare const obj: { a?: string, b?: number }; | ||
const { | ||
a = "0", | ||
b = +a, | ||
} = obj; | ||
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//// [controlFlowInitializedDestructuringVariables.js] | ||
"use strict"; | ||
var _a = obj.a, a = _a === void 0 ? "0" : _a, _b = obj.b, b = _b === void 0 ? +a : _b; |
17 changes: 17 additions & 0 deletions
17
tests/baselines/reference/controlFlowInitializedDestructuringVariables.symbols
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@@ -0,0 +1,17 @@ | ||
=== tests/cases/compiler/controlFlowInitializedDestructuringVariables.ts === | ||
declare const obj: { a?: string, b?: number }; | ||
>obj : Symbol(obj, Decl(controlFlowInitializedDestructuringVariables.ts, 0, 13)) | ||
>a : Symbol(a, Decl(controlFlowInitializedDestructuringVariables.ts, 0, 20)) | ||
>b : Symbol(b, Decl(controlFlowInitializedDestructuringVariables.ts, 0, 32)) | ||
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const { | ||
a = "0", | ||
>a : Symbol(a, Decl(controlFlowInitializedDestructuringVariables.ts, 1, 7)) | ||
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b = +a, | ||
>b : Symbol(b, Decl(controlFlowInitializedDestructuringVariables.ts, 2, 12)) | ||
>a : Symbol(a, Decl(controlFlowInitializedDestructuringVariables.ts, 1, 7)) | ||
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} = obj; | ||
>obj : Symbol(obj, Decl(controlFlowInitializedDestructuringVariables.ts, 0, 13)) | ||
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19 changes: 19 additions & 0 deletions
19
tests/baselines/reference/controlFlowInitializedDestructuringVariables.types
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@@ -0,0 +1,19 @@ | ||
=== tests/cases/compiler/controlFlowInitializedDestructuringVariables.ts === | ||
declare const obj: { a?: string, b?: number }; | ||
>obj : { a?: string | undefined; b?: number | undefined; } | ||
>a : string | undefined | ||
>b : number | undefined | ||
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const { | ||
a = "0", | ||
>a : string | ||
>"0" : "0" | ||
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b = +a, | ||
>b : number | ||
>+a : number | ||
>a : string | ||
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} = obj; | ||
>obj : { a?: string | undefined; b?: number | undefined; } | ||
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22 changes: 22 additions & 0 deletions
22
tests/cases/compiler/controlFlowDestructuringVariablesInTryCatch.ts
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@@ -0,0 +1,22 @@ | ||
// @strict: true | ||
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declare function f1(): string; | ||
declare function f2(): [b: string]; | ||
declare function f3(): { c: string }; | ||
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try { | ||
var a = f1(); | ||
var [b] = f2(); | ||
var { c } = f3(); | ||
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var [d = 1] = []; | ||
var { e = 1 } = { }; | ||
} catch { | ||
console.error("error"); | ||
} | ||
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a; | ||
b; | ||
c; | ||
d; | ||
e; |
7 changes: 7 additions & 0 deletions
7
tests/cases/compiler/controlFlowInitializedDestructuringVariables.ts
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@@ -0,0 +1,7 @@ | ||
// @strict: true | ||
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declare const obj: { a?: string, b?: number }; | ||
const { | ||
a = "0", | ||
b = +a, | ||
} = obj; |