check for presence of array

weswigham · weswigham · commit 835950a674cd · 2015-12-04T13:44:16.000-08:00
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -1153,7 +1153,7 @@ namespace ts {
                     for (const id in lookupTable) {
                         const { exportsWithDuplicate } = lookupTable[id];
                         // It's not an error if the file with multiple `export *`s with duplicate names exports a member with that name itself
-                        if (id === "export=" || !exportsWithDuplicate.length || hasProperty(symbols, id)) {
+                        if (id === "export=" || !(exportsWithDuplicate && exportsWithDuplicate.length) || hasProperty(symbols, id)) {
                             continue;
                         }
                         for (const node of exportsWithDuplicate) {

Original file line number	Diff line number	Diff line change
`@@ -1153,7 +1153,7 @@ namespace ts {`
`1153`	`1153`	`for (const id in lookupTable) {`
`1154`	`1154`	`const { exportsWithDuplicate } = lookupTable[id];`
`1155`	`1155`	// It's not an error if the file with multiple `export *`s with duplicate names exports a member with that name itself
`1156`		`- if (id === "export=" \|\| !exportsWithDuplicate.length \|\| hasProperty(symbols, id)) {`
	`1156`	`+ if (id === "export=" \|\| !(exportsWithDuplicate && exportsWithDuplicate.length) \|\| hasProperty(symbols, id)) {`
`1157`	`1157`	`continue;`
`1158`	`1158`	`}`
`1159`	`1159`	`for (const node of exportsWithDuplicate) {`