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Commit92eedcb

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🤖 Pick PR#61452 (Fix errors on type assertions in er...) into release-5.8 (#61453)
Co-authored-by: Daniel Rosenwasser <DanielRosenwasser@users.noreply.github.com>
1 parent88a002a commit92eedcb

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6 files changed

+87
-2
lines changed

6 files changed

+87
-2
lines changed

‎src/compiler/checker.ts

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Original file line numberDiff line numberDiff line change
@@ -37315,8 +37315,8 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
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grammarErrorOnNode(node, Diagnostics.This_syntax_is_reserved_in_files_with_the_mts_or_cts_extension_Use_an_as_expression_instead);
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}
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if (compilerOptions.erasableSyntaxOnly) {
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const start =node.type.pos - "<".length;
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const end =skipTrivia(file.text,node.type.end) + ">".length;
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const start =skipTrivia(file.text, node.pos);
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const end = node.expression.pos;
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diagnostics.add(createFileDiagnostic(file, start, end - start, Diagnostics.This_syntax_is_not_allowed_when_erasableSyntaxOnly_is_enabled));
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}
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}
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index.ts(1,10): error TS1294: This syntax is not allowed when 'erasableSyntaxOnly' is enabled.
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index.ts(1,19): error TS1005: '>' expected.
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index.ts(2,9): error TS1294: This syntax is not allowed when 'erasableSyntaxOnly' is enabled.
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index.ts(2,18): error TS1005: '>' expected.
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index.ts(3,9): error TS1294: This syntax is not allowed when 'erasableSyntaxOnly' is enabled.
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index.ts(3,17): error TS1005: '>' expected.
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==== index.ts (6 errors) ====
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let a = (<unknown function foo() {});
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~~~~~~~~
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!!! error TS1294: This syntax is not allowed when 'erasableSyntaxOnly' is enabled.
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~~~~~~~~
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!!! error TS1005: '>' expected.
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let b = <unknown 123;
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~~~~~~~~
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!!! error TS1294: This syntax is not allowed when 'erasableSyntaxOnly' is enabled.
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~~~
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!!! error TS1005: '>' expected.
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let c = <unknown
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~~~~~~~~
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!!! error TS1294: This syntax is not allowed when 'erasableSyntaxOnly' is enabled.
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!!! error TS1005: '>' expected.
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//// [tests/cases/compiler/erasableSyntaxOnly2.ts] ////
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//// [index.ts]
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leta=(<unknownfunctionfoo(){});
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letb=<unknown123;
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letc=<unknown
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//// [index.js]
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vara=functionfoo(){};
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varb=123;
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varc=;
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//// [tests/cases/compiler/erasableSyntaxOnly2.ts] ////
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=== index.ts ===
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let a = (<unknown function foo() {});
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>a : Symbol(a, Decl(index.ts, 0, 3))
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>foo : Symbol(foo, Decl(index.ts, 0, 17))
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let b = <unknown 123;
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>b : Symbol(b, Decl(index.ts, 1, 3))
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let c = <unknown
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>c : Symbol(c, Decl(index.ts, 2, 3))
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//// [tests/cases/compiler/erasableSyntaxOnly2.ts] ////
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=== index.ts ===
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let a = (<unknown function foo() {});
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>a : unknown
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> : ^^^^^^^
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>(<unknown function foo() {}) : unknown
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> : ^^^^^^^
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><unknown function foo() {} : unknown
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> : ^^^^^^^
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>function foo() {} : () => void
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> : ^^^^^^^^^^
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>foo : () => void
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> : ^^^^^^^^^^
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let b = <unknown 123;
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>b : unknown
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> : ^^^^^^^
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><unknown 123 : unknown
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> : ^^^^^^^
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>123 : 123
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> : ^^^
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let c = <unknown
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>c : unknown
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> : ^^^^^^^
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><unknown : unknown
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> : ^^^^^^^
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> : any
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> : ^^^
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//@erasableSyntaxOnly: true
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//@filename: index.ts
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leta=(<unknownfunctionfoo(){});
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letb=<unknown123;
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letc=<unknown

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