Addressing CR feedback
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37b5c74b93
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5 changed files with 23 additions and 9 deletions
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@ -4622,8 +4622,8 @@ module ts {
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// Get the narrowed type of a given symbol at a given location
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function getNarrowedTypeOfSymbol(symbol: Symbol, node: Node) {
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var type = getTypeOfSymbol(symbol);
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// Only narrow when symbol is variable of a structured type
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if (node && (symbol.flags & SymbolFlags.Variable && type.flags & TypeFlags.Structured)) {
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// Only narrow when symbol is variable of an object, union, or type parameter type
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if (node && symbol.flags & SymbolFlags.Variable && type.flags & (TypeFlags.ObjectType | TypeFlags.Union | TypeFlags.TypeParameter)) {
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loop: while (node.parent) {
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var child = node;
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node = node.parent;
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@ -6587,12 +6587,12 @@ module ts {
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return numberType;
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}
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// Return true if type is any, an object type, a type parameter, or a union type composed of only those kinds of types
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// Return true if type an object type, a type parameter, or a union type composed of only those kinds of types
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function isStructuredType(type: Type): boolean {
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if (type.flags & TypeFlags.Union) {
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return !forEach((<UnionType>type).types, t => !isStructuredType(t));
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}
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return (type.flags & TypeFlags.Structured) !== 0;
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return (type.flags & (TypeFlags.ObjectType | TypeFlags.TypeParameter)) !== 0;
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}
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function isConstEnumObjectType(type: Type): boolean {
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@ -1240,7 +1240,6 @@ module ts {
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StringLike = String | StringLiteral,
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NumberLike = Number | Enum,
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ObjectType = Class | Interface | Reference | Tuple | Anonymous,
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Structured = ObjectType | Union | TypeParameter
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}
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// Properties common to all types
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@ -1,12 +1,18 @@
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//// [typeGuardsWithAny.ts]
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var x: any = { p: 0 };
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if (x instanceof Object) {
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x.p; // No error, type any is not narrowed
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x.p; // No error, type any unaffected by type guard
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}
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else {
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x.p; // No error, type any unaffected by type guard
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}
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//// [typeGuardsWithAny.js]
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var x = { p: 0 };
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if (x instanceof Object) {
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x.p; // No error, type any is not narrowed
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x.p; // No error, type any unaffected by type guard
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}
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else {
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x.p; // No error, type any unaffected by type guard
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}
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@ -9,7 +9,13 @@ if (x instanceof Object) {
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>x : any
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>Object : ObjectConstructor
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x.p; // No error, type any is not narrowed
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x.p; // No error, type any unaffected by type guard
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>x.p : any
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>x : any
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>p : any
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}
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else {
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x.p; // No error, type any unaffected by type guard
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>x.p : any
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>x : any
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>p : any
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@ -1,4 +1,7 @@
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var x: any = { p: 0 };
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if (x instanceof Object) {
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x.p; // No error, type any is not narrowed
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x.p; // No error, type any unaffected by type guard
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}
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else {
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x.p; // No error, type any unaffected by type guard
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}
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