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Allow Boolean() to be used to perform a null check (#29955)
* Allow Boolean() to be used to perform a null check * Add missing test case output
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//// [typeGuardBoolean.ts] | ||
function test(strOrNull: string | null, strOrUndefined: string | undefined) { | ||
var str: string = "original"; | ||
var nil: null; | ||
if (!Boolean(strOrNull)) { | ||
nil = strOrNull; | ||
} | ||
else { | ||
str = strOrNull; | ||
} | ||
if (Boolean(strOrUndefined)) { | ||
str = strOrUndefined; | ||
} | ||
} | ||
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//// [typeGuardBoolean.js] | ||
function test(strOrNull, strOrUndefined) { | ||
var str = "original"; | ||
var nil; | ||
if (!Boolean(strOrNull)) { | ||
nil = strOrNull; | ||
} | ||
else { | ||
str = strOrNull; | ||
} | ||
if (Boolean(strOrUndefined)) { | ||
str = strOrUndefined; | ||
} | ||
} |
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@@ -0,0 +1,35 @@ | ||
=== tests/cases/conformance/expressions/typeGuards/typeGuardBoolean.ts === | ||
function test(strOrNull: string | null, strOrUndefined: string | undefined) { | ||
>test : Symbol(test, Decl(typeGuardBoolean.ts, 0, 0)) | ||
>strOrNull : Symbol(strOrNull, Decl(typeGuardBoolean.ts, 0, 14)) | ||
>strOrUndefined : Symbol(strOrUndefined, Decl(typeGuardBoolean.ts, 0, 39)) | ||
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var str: string = "original"; | ||
>str : Symbol(str, Decl(typeGuardBoolean.ts, 1, 5)) | ||
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var nil: null; | ||
>nil : Symbol(nil, Decl(typeGuardBoolean.ts, 2, 5)) | ||
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if (!Boolean(strOrNull)) { | ||
>Boolean : Symbol(Boolean, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --)) | ||
>strOrNull : Symbol(strOrNull, Decl(typeGuardBoolean.ts, 0, 14)) | ||
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nil = strOrNull; | ||
>nil : Symbol(nil, Decl(typeGuardBoolean.ts, 2, 5)) | ||
>strOrNull : Symbol(strOrNull, Decl(typeGuardBoolean.ts, 0, 14)) | ||
} | ||
else { | ||
str = strOrNull; | ||
>str : Symbol(str, Decl(typeGuardBoolean.ts, 1, 5)) | ||
>strOrNull : Symbol(strOrNull, Decl(typeGuardBoolean.ts, 0, 14)) | ||
} | ||
if (Boolean(strOrUndefined)) { | ||
>Boolean : Symbol(Boolean, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --)) | ||
>strOrUndefined : Symbol(strOrUndefined, Decl(typeGuardBoolean.ts, 0, 39)) | ||
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str = strOrUndefined; | ||
>str : Symbol(str, Decl(typeGuardBoolean.ts, 1, 5)) | ||
>strOrUndefined : Symbol(strOrUndefined, Decl(typeGuardBoolean.ts, 0, 39)) | ||
} | ||
} | ||
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@@ -0,0 +1,44 @@ | ||
=== tests/cases/conformance/expressions/typeGuards/typeGuardBoolean.ts === | ||
function test(strOrNull: string | null, strOrUndefined: string | undefined) { | ||
>test : (strOrNull: string | null, strOrUndefined: string | undefined) => void | ||
>strOrNull : string | null | ||
>null : null | ||
>strOrUndefined : string | undefined | ||
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var str: string = "original"; | ||
>str : string | ||
>"original" : "original" | ||
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var nil: null; | ||
>nil : null | ||
>null : null | ||
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if (!Boolean(strOrNull)) { | ||
>!Boolean(strOrNull) : boolean | ||
>Boolean(strOrNull) : boolean | ||
>Boolean : BooleanConstructor | ||
>strOrNull : string | null | ||
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nil = strOrNull; | ||
>nil = strOrNull : null | ||
>nil : null | ||
>strOrNull : null | ||
} | ||
else { | ||
str = strOrNull; | ||
>str = strOrNull : string | ||
>str : string | ||
>strOrNull : string | ||
} | ||
if (Boolean(strOrUndefined)) { | ||
>Boolean(strOrUndefined) : boolean | ||
>Boolean : BooleanConstructor | ||
>strOrUndefined : string | undefined | ||
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str = strOrUndefined; | ||
>str = strOrUndefined : string | ||
>str : string | ||
>strOrUndefined : string | ||
} | ||
} | ||
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14 changes: 14 additions & 0 deletions
14
tests/cases/conformance/expressions/typeGuards/typeGuardBoolean.ts
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Original file line number | Diff line number | Diff line change |
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// @strictNullChecks: true | ||
function test(strOrNull: string | null, strOrUndefined: string | undefined) { | ||
var str: string = "original"; | ||
var nil: null; | ||
if (!Boolean(strOrNull)) { | ||
nil = strOrNull; | ||
} | ||
else { | ||
str = strOrNull; | ||
} | ||
if (Boolean(strOrUndefined)) { | ||
str = strOrUndefined; | ||
} | ||
} |