Microsoft/TypeScript
1
0
Fork 0
mirror of https://github.com/microsoft/TypeScript.git synced 2025-11-18 17:21:48 +00:00
Code Issues Packages Projects Releases Wiki Activity

Adding a few comments

Browse Source
This commit is contained in:
Anders Hejlsberg
2015-09-01 13:15:43 -07:00
parent e78478b767
commit c436736e1e
1 changed files with 4 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/compiler/checker.ts
+4
View File
@@ -7041,12 +7041,16 @@ namespace ts {
hasSpreadElement = hasSpreadElement || e.kind === SyntaxKind.SpreadElementExpression;
}
if (!hasSpreadElement) {
// If array literal is actually a destructuring pattern, mark it as an implied type. We do this such
// that we get the same behavior for "var [x, y] = []" and "[x, y] = []".
if (inDestructuringPattern && elementTypes.length) {
return createImpliedType(createTupleType(elementTypes));
}
let contextualType = getContextualType(node);
let contextualTupleLikeType = contextualType && contextualTypeIsTupleLikeType(contextualType) ? contextualType : undefined;
if (contextualTupleLikeType) {
// If array literal is contextually typed by the implied type of a binding pattern, pad the resulting
// tuple type with elements from the binding tuple type to make the lengths equal.
if (contextualTupleLikeType.flags & TypeFlags.Tuple && contextualTupleLikeType.flags & TypeFlags.ImpliedType) {
let contextualElementTypes = (<TupleType>contextualTupleLikeType).elementTypes;
for (let i = elementTypes.length; i < contextualElementTypes.length; i++) {