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🤖 Pick PR #61244 (Ban old-style type assertions under...) into release-5.8 (#61320)

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Co-authored-by: Jake Bailey <5341706+jakebailey@users.noreply.github.com>
This commit is contained in:
TypeScript Bot
2025-03-19 14:37:01 -07:00
committed by GitHub
parent f6b94db7d4
commit fca87f2721
6 changed files with 362 additions and 1 deletions
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src/compiler/checker.ts
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@@ -37314,6 +37314,11 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
if (file && fileExtensionIsOneOf(file.fileName, [Extension.Cts, Extension.Mts])) {
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;
diagnostics.add(createFileDiagnostic(file, start, end - start, Diagnostics.This_syntax_is_not_allowed_when_erasableSyntaxOnly_is_enabled));
}
}
return checkAssertionWorker(node, checkMode);
}