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Fixed an incorrect assumption K in Union works with numeric literals

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kujon
2017-12-15 22:28:29 +00:00
parent 92bffe43c5
commit 8755d4da47
6 changed files with 14 additions and 59 deletions
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src/compiler/checker.ts
+1 -1
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@@ -25781,7 +25781,7 @@ namespace ts {
return grammarErrorOnNode(parameter.name, Diagnostics.An_index_signature_parameter_type_cannot_be_a_type_alias_Use_index_Colon_0_instead, typeToString(type));
}
if (type.flags & TypeFlags.Union && every((<UnionType>type).types, t => !!(t.flags & TypeFlags.StringOrNumberLiteral))) {
if (type.flags & TypeFlags.Union && every((<UnionType>type).types, t => !!(t.flags & TypeFlags.StringLiteral))) {
return grammarErrorOnNode(parameter.name, Diagnostics.An_index_signature_parameter_type_cannot_be_a_union_type_Use_K_in_0_instead, symbolName(type.aliasSymbol));
}