diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts index 9021a50ef8d..a1248d536a8 100644 --- a/src/compiler/checker.ts +++ b/src/compiler/checker.ts @@ -1518,7 +1518,8 @@ namespace ts { !checkAndReportErrorForExtendingInterface(errorLocation) && !checkAndReportErrorForUsingTypeAsNamespace(errorLocation, name, meaning) && !checkAndReportErrorForUsingTypeAsValue(errorLocation, name, meaning) && - !checkAndReportErrorForUsingNamespaceModuleAsValue(errorLocation, name, meaning)) { + !checkAndReportErrorForUsingNamespaceModuleAsValue(errorLocation, name, meaning) && + !checkAndReportErrorForUsingValueAsType(errorLocation, name, meaning)) { let suggestion: Symbol | undefined; if (suggestedNameNotFoundMessage && suggestionCount < maximumSuggestionCount) { suggestion = getSuggestedSymbolForNonexistentSymbol(originalLocation, name, meaning); @@ -1708,6 +1709,17 @@ namespace ts { return false; } + function checkAndReportErrorForUsingValueAsType(errorLocation: Node, name: __String, meaning: SymbolFlags): boolean { + if (meaning & (SymbolFlags.Type & ~SymbolFlags.Namespace)) { + const symbol = resolveSymbol(resolveName(errorLocation, name, ~SymbolFlags.Type & SymbolFlags.Value, /*nameNotFoundMessage*/undefined, /*nameArg*/ undefined, /*isUse*/ false)); + if (symbol && !(symbol.flags & SymbolFlags.Namespace)) { + error(errorLocation, Diagnostics._0_refers_to_a_value_but_is_being_used_as_a_type_here, unescapeLeadingUnderscores(name)); + return true; + } + } + return false; + } + function checkAndReportErrorForUsingTypeAsValue(errorLocation: Node, name: __String, meaning: SymbolFlags): boolean { if (meaning & (SymbolFlags.Value & ~SymbolFlags.NamespaceModule)) { if (name === "any" || name === "string" || name === "number" || name === "boolean" || name === "never") { diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json index e40fccd8bf2..89794d26181 100644 --- a/src/compiler/diagnosticMessages.json +++ b/src/compiler/diagnosticMessages.json @@ -2581,6 +2581,10 @@ "category": "Error", "code": 2748 }, + "'{0}' refers to a value, but is being used as a type here.": { + "category": "Error", + "code": 2749 + }, "Import declaration '{0}' is using private name '{1}'.": { "category": "Error",