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Fix errors on type assertions in erasableSyntaxOnly (#61452)

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This commit is contained in:
Daniel Rosenwasser
2025-03-19 16:25:22 -07:00
committed by GitHub
parent ee3dd7264b
commit 4dc677b292
6 changed files with 87 additions and 2 deletions
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4
src/compiler/checker.ts
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@@ -37316,8 +37316,8 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
grammarErrorOnNode(node, Diagnostics.This_syntax_is_reserved_in_files_with_the_mts_or_cts_extension_Use_an_as_expression_instead);
}
if (compilerOptions.erasableSyntaxOnly) {
const start = node.type.pos - "<".length;
const end = skipTrivia(file.text, node.type.end) + ">".length;
const start = skipTrivia(file.text, node.pos);
const end = node.expression.pos;
diagnostics.add(createFileDiagnostic(file, start, end - start, Diagnostics.This_syntax_is_not_allowed_when_erasableSyntaxOnly_is_enabled));
}
}

24
tests/baselines/reference/erasableSyntaxOnly2.errors.txt Normal file
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@@ -0,0 +1,24 @@
index.ts(1,10): error TS1294: This syntax is not allowed when 'erasableSyntaxOnly' is enabled.
index.ts(1,19): error TS1005: '>' expected.
index.ts(2,9): error TS1294: This syntax is not allowed when 'erasableSyntaxOnly' is enabled.
index.ts(2,18): error TS1005: '>' expected.
index.ts(3,9): error TS1294: This syntax is not allowed when 'erasableSyntaxOnly' is enabled.
index.ts(3,17): error TS1005: '>' expected.
==== index.ts (6 errors) ====
let a = (<unknown function foo() {});
~~~~~~~~
!!! error TS1294: This syntax is not allowed when 'erasableSyntaxOnly' is enabled.
~~~~~~~~
!!! error TS1005: '>' expected.
let b = <unknown 123;
~~~~~~~~
!!! error TS1294: This syntax is not allowed when 'erasableSyntaxOnly' is enabled.
~~~
!!! error TS1005: '>' expected.
let c = <unknown
~~~~~~~~
!!! error TS1294: This syntax is not allowed when 'erasableSyntaxOnly' is enabled.
!!! error TS1005: '>' expected.

11
tests/baselines/reference/erasableSyntaxOnly2.js Normal file
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@@ -0,0 +1,11 @@
//// [tests/cases/compiler/erasableSyntaxOnly2.ts] ////
//// [index.ts]
let a = (<unknown function foo() {});
let b = <unknown 123;
let c = <unknown
//// [index.js]
var a = function foo() { };
var b = 123;
var c = ;

13
tests/baselines/reference/erasableSyntaxOnly2.symbols Normal file
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@@ -0,0 +1,13 @@
//// [tests/cases/compiler/erasableSyntaxOnly2.ts] ////
=== index.ts ===
let a = (<unknown function foo() {});
>a : Symbol(a, Decl(index.ts, 0, 3))
>foo : Symbol(foo, Decl(index.ts, 0, 17))
let b = <unknown 123;
>b : Symbol(b, Decl(index.ts, 1, 3))
let c = <unknown
>c : Symbol(c, Decl(index.ts, 2, 3))

31
tests/baselines/reference/erasableSyntaxOnly2.types Normal file
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@@ -0,0 +1,31 @@
//// [tests/cases/compiler/erasableSyntaxOnly2.ts] ////
=== index.ts ===
let a = (<unknown function foo() {});
>a : unknown
> : ^^^^^^^
>(<unknown function foo() {}) : unknown
> : ^^^^^^^
><unknown function foo() {} : unknown
> : ^^^^^^^
>function foo() {} : () => void
> : ^^^^^^^^^^
>foo : () => void
> : ^^^^^^^^^^
let b = <unknown 123;
>b : unknown
> : ^^^^^^^
><unknown 123 : unknown
> : ^^^^^^^
>123 : 123
> : ^^^
let c = <unknown
>c : unknown
> : ^^^^^^^
><unknown : unknown
> : ^^^^^^^
> : any
> : ^^^

6
tests/cases/compiler/erasableSyntaxOnly2.ts Normal file
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@@ -0,0 +1,6 @@
// @erasableSyntaxOnly: true
// @filename: index.ts
let a = (<unknown function foo() {});
let b = <unknown 123;
let c = <unknown