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Only emit the RHS in an empty assignment pattern.

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This commit is contained in:
Daniel Rosenwasser
2015-07-16 17:40:07 -07:00
parent 0ec38b7590
commit 0bdc79fbb8
2 changed files with 16 additions and 1 deletions
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6
src/compiler/emitter.ts
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@@ -3249,7 +3249,11 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
function emitAssignmentExpression(root: BinaryExpression) {
let target = root.left;
let value = root.right;
if (isAssignmentExpressionStatement) {
if (isEmptyObjectLiteralOrArrayLiteral(target)) {
emit(value);
}
else if (isAssignmentExpressionStatement) {
emitDestructuringAssignment(target, value);
}
else {

11
src/compiler/utilities.ts
View File

@@ -1981,6 +1981,17 @@ namespace ts {
(node.parent.kind === SyntaxKind.PropertyAccessExpression && (<PropertyAccessExpression>node.parent).name === node);
}
export function isEmptyObjectLiteralOrArrayLiteral(expression: Node): boolean {
let kind = expression.kind;
if (kind === SyntaxKind.ObjectLiteralExpression) {
return (<ObjectLiteralExpression>expression).properties.length === 0;
}
if (kind === SyntaxKind.ArrayLiteralExpression) {
return (<ArrayLiteralExpression>expression).elements.length === 0;
}
return false;
}
export function getLocalSymbolForExportDefault(symbol: Symbol) {
return symbol && symbol.valueDeclaration && (symbol.valueDeclaration.flags & NodeFlags.Default) ? symbol.valueDeclaration.localSymbol : undefined;
}