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use downlevel destructuring for exported variables for target=ES6 if module kind is not ES6

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This commit is contained in:
Vladimir Matveev
2016-03-16 16:40:35 -07:00
parent 1156141b5e
commit 3ede567fbc
33 changed files with 373 additions and 4 deletions
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25
src/compiler/emitter.ts
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@@ -4218,12 +4218,29 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
function emitVariableDeclaration(node: VariableDeclaration) {
if (isBindingPattern(node.name)) {
if (languageVersion < ScriptTarget.ES6) {
emitDestructuring(node, /*isAssignmentExpressionStatement*/ false);
}
else {
const isExported = getCombinedNodeFlags(node) & NodeFlags.Export;
if (languageVersion >= ScriptTarget.ES6 && (!isExported || modulekind === ModuleKind.ES6)) {
// emit ES6 destructuring only if target module is ES6 or variable is not exported
// exported variables in CJS\AMD are prefixed with 'exports.' so result javascript { exports.toString } = 1; is illegal
const isTopLevelDeclarationInSystemModule =
modulekind === ModuleKind.System &&
shouldHoistVariable(node, /*checkIfSourceFileLevelDecl*/true);
if (isTopLevelDeclarationInSystemModule) {
// is system modules top level variables are hoisted
write("(");
}
emit(node.name);
emitOptional(" = ", node.initializer);
if (isTopLevelDeclarationInSystemModule) {
write(")");
}
}
else {
emitDestructuring(node, /*isAssignmentExpressionStatement*/ false);
}
}
else {