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Error when used enum before declaration

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This commit is contained in:
Kanchalai Tanglertsampan
2017-02-27 11:21:12 -08:00
parent f7df4e00cc
commit 5d46d434e0
5 changed files with 51 additions and 6 deletions
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16
src/compiler/checker.ts
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@@ -1056,9 +1056,10 @@ namespace ts {
// block-scoped variable and namespace module. However, only when we
// try to resolve name in /*1*/ which is used in variable position,
// we want to check for block-scoped
if (meaning & SymbolFlags.BlockScopedVariable || (meaning & SymbolFlags.Class && (meaning & SymbolFlags.Value) === SymbolFlags.Value)) {
if (meaning & SymbolFlags.BlockScopedVariable ||
((meaning & SymbolFlags.Class || meaning & SymbolFlags.Enum) && (meaning & SymbolFlags.Value) === SymbolFlags.Value)) {
const exportOrLocalSymbol = getExportSymbolOfValueSymbolIfExported(result);
if (exportOrLocalSymbol.flags & SymbolFlags.BlockScopedVariable || exportOrLocalSymbol.flags & SymbolFlags.Class) {
if (exportOrLocalSymbol.flags & SymbolFlags.BlockScopedVariable || exportOrLocalSymbol.flags & SymbolFlags.Class || exportOrLocalSymbol.flags & SymbolFlags.Enum) {
checkResolvedBlockScopedVariable(exportOrLocalSymbol, errorLocation);
}
}
@@ -1171,19 +1172,22 @@ namespace ts {
}
function checkResolvedBlockScopedVariable(result: Symbol, errorLocation: Node): void {
Debug.assert(!!(result.flags & SymbolFlags.BlockScopedVariable || result.flags & SymbolFlags.Class));
Debug.assert(!!(result.flags & SymbolFlags.BlockScopedVariable || result.flags & SymbolFlags.Class || result.flags & SymbolFlags.Enum));
// Block-scoped variables cannot be used before their definition
const declaration = forEach(result.declarations, d => isBlockOrCatchScoped(d) || isClassLike(d) ? d : undefined);
const declaration = forEach(result.declarations, d => isBlockOrCatchScoped(d) || isClassLike(d) || (d.kind === SyntaxKind.EnumDeclaration) ? d : undefined);
Debug.assert(declaration !== undefined, "Block-scoped variable declaration is undefined");
Debug.assert(declaration !== undefined, "Declaration to checkResolvedBlockScopedVariable is undefined");
if (!isInAmbientContext(declaration) && !isBlockScopedNameDeclaredBeforeUse(declaration, errorLocation)) {
if (result.flags & SymbolFlags.BlockScopedVariable) {
error(errorLocation, Diagnostics.Block_scoped_variable_0_used_before_its_declaration, declarationNameToString(declaration.name));
}
else {
else if (result.flags & SymbolFlags.Class) {
error(errorLocation, Diagnostics.Class_0_used_before_its_declaration, declarationNameToString(declaration.name));
}
else if (result.flags & SymbolFlags.Enum) {
error(errorLocation, Diagnostics.Enum_0_used_before_its_declaration, declarationNameToString(declaration.name));
}
}
}

4
src/compiler/diagnosticMessages.json
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@@ -1439,6 +1439,10 @@
"category": "Error",
"code": 2449
},
"Enum '{0}' used before its declaration.": {
"category": "Error",
"code": 2450
},
"Cannot redeclare block-scoped variable '{0}'.": {
"category": "Error",
"code": 2451

15
tests/baselines/reference/enumUsedBeforeDeclaration.errors.txt Normal file
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@@ -0,0 +1,15 @@
tests/cases/compiler/enumUsedBeforeDeclaration.ts(1,18): error TS2450: Enum 'Color' used before its declaration.
tests/cases/compiler/enumUsedBeforeDeclaration.ts(2,24): error TS2450: Enum 'ConstColor' used before its declaration.
==== tests/cases/compiler/enumUsedBeforeDeclaration.ts (2 errors) ====
const v: Color = Color.Green;
~~~~~
!!! error TS2450: Enum 'Color' used before its declaration.
const v2: ConstColor = ConstColor.Green;
~~~~~~~~~~
!!! error TS2450: Enum 'ConstColor' used before its declaration.
enum Color { Red, Green, Blue }
const enum ConstColor { Red, Green, Blue }

17
tests/baselines/reference/enumUsedBeforeDeclaration.js Normal file
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@@ -0,0 +1,17 @@
//// [enumUsedBeforeDeclaration.ts]
const v: Color = Color.Green;
const v2: ConstColor = ConstColor.Green;
enum Color { Red, Green, Blue }
const enum ConstColor { Red, Green, Blue }
//// [enumUsedBeforeDeclaration.js]
var v = Color.Green;
var v2 = 1 /* Green */;
var Color;
(function (Color) {
Color[Color["Red"] = 0] = "Red";
Color[Color["Green"] = 1] = "Green";
Color[Color["Blue"] = 2] = "Blue";
})(Color || (Color = {}));

5
tests/cases/compiler/enumUsedBeforeDeclaration.ts Normal file
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@@ -0,0 +1,5 @@
const v: Color = Color.Green;
const v2: ConstColor = ConstColor.Green;
enum Color { Red, Green, Blue }
const enum ConstColor { Red, Green, Blue }