Property access for string index signatures

sandersn · sandersn · commit ca9f599563e6 · 2016-12-05T09:57:11.000-08:00
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -12223,6 +12223,10 @@ namespace ts {
             }
             const prop = getPropertyOfType(apparentType, right.text);
             if (!prop) {
+                const stringIndexType = getIndexTypeOfType(apparentType, IndexKind.String);
+                if (stringIndexType) {
+                    return stringIndexType;
+                }
                 if (right.text && !checkAndReportErrorForExtendingInterface(node)) {
                     reportNonexistentProperty(right, type.flags & TypeFlags.TypeParameter && (type as TypeParameter).isThisType ? apparentType : type);
                 }

Original file line number	Diff line number	Diff line change
`@@ -12223,6 +12223,10 @@ namespace ts {`
`12223`	`12223`	`}`
`12224`	`12224`	`const prop = getPropertyOfType(apparentType, right.text);`
`12225`	`12225`	`if (!prop) {`
	`12226`	`+ const stringIndexType = getIndexTypeOfType(apparentType, IndexKind.String);`
	`12227`	`+ if (stringIndexType) {`
	`12228`	`+ return stringIndexType;`
	`12229`	`+ }`
`12226`	`12230`	`if (right.text && !checkAndReportErrorForExtendingInterface(node)) {`
`12227`	`12231`	`reportNonexistentProperty(right, type.flags & TypeFlags.TypeParameter && (type as TypeParameter).isThisType ? apparentType : type);`
`12228`	`12232`	`}`