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elide exports with no value side

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This commit is contained in:
Vladimir Matveev 2016-04-12 15:19:05 -07:00
parent a27b4d07ae
commit 80fab7c5a4
1 changed files with 35 additions and 1 deletions
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36
src/compiler/transformers/module/es6.ts
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@ -34,12 +34,18 @@ namespace ts {
return visitImportSpecifier(<ImportSpecifier>node);
case SyntaxKind.ExportAssignment:
return visitExportAssignment(<ExportAssignment>node);
case SyntaxKind.ExportDeclaration:
return visitExportDeclaration(<ExportDeclaration>node);
case SyntaxKind.NamedExports:
return visitNamedExports(<NamedExports>node);
case SyntaxKind.ExportSpecifier:
return visitExportSpecifier(<ExportSpecifier>node);
}
return node;
}
function visitExportAssignment(node: ExportAssignment): ExportDeclaration {
function visitExportAssignment(node: ExportAssignment): ExportAssignment {
if (node.isExportEquals) {
return undefined; // do not emit export equals for ES6
}
@ -47,6 +53,34 @@ namespace ts {
return nodeIsSynthesized(original) || resolver.isValueAliasDeclaration(original) ? node: undefined;
}
function visitExportDeclaration(node: ExportDeclaration): ExportDeclaration {
if (!node.exportClause) {
return node; // export * is always emitted
}
if (!resolver.isValueAliasDeclaration(node)) {
return undefined;
}
const newExportClause = visitNode(node.exportClause, visitor, isNamedExports, /*optional*/ true);
if (node.exportClause === newExportClause) {
return node;
}
return newExportClause
? createExportDeclaration(newExportClause, node.moduleSpecifier)
: undefined;
}
function visitNamedExports(node: NamedExports): NamedExports {
const newExports = visitNodes(node.elements, visitor, isExportSpecifier);
if (node.elements === newExports) {
return node;
}
return newExports.length ? createNamedExports(newExports) : undefined;
}
function visitExportSpecifier(node: ExportSpecifier): ExportSpecifier {
return resolver.isValueAliasDeclaration(node) ? node : undefined;
}
function visitImportEqualsDeclaration(node: ImportEqualsDeclaration): ImportEqualsDeclaration {
return !isExternalModuleImportEqualsDeclaration(node) || resolver.isReferencedAliasDeclaration(node) ? node : undefined;
}