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140 lines (125 loc) · 6.14 KB
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/// <reference path="../../factory.ts" />
/// <reference path="../../visitor.ts" />
/*@internal*/
namespace ts {
export function transformES6Module(context: TransformationContext) {
const compilerOptions = context.getCompilerOptions();
const resolver = context.getEmitResolver();
let currentSourceFile: SourceFile;
return transformSourceFile;
function transformSourceFile(node: SourceFile) {
if (isExternalModule(node) || compilerOptions.isolatedModules) {
currentSourceFile = node;
return visitEachChild(node, visitor, context);
}
return node;
}
function visitor(node: Node): VisitResult<Node> {
switch (node.kind) {
case SyntaxKind.ImportDeclaration:
return visitImportDeclaration(<ImportDeclaration>node);
case SyntaxKind.ImportEqualsDeclaration:
return visitImportEqualsDeclaration(<ImportEqualsDeclaration>node);
case SyntaxKind.ImportClause:
return visitImportClause(<ImportClause>node);
case SyntaxKind.NamedImports:
case SyntaxKind.NamespaceImport:
return visitNamedBindings(<NamedImportBindings>node);
case SyntaxKind.ImportSpecifier:
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): ExportAssignment {
if (node.isExportEquals) {
return undefined; // do not emit export equals for ES6
}
const original = getOriginalNode(node);
return nodeIsSynthesized(original) || resolver.isValueAliasDeclaration(original) ? node : undefined;
}
function visitExportDeclaration(node: ExportDeclaration): ExportDeclaration {
if (!node.exportClause) {
return resolver.moduleExportsSomeValue(node.moduleSpecifier) ? node : undefined;
}
if (!resolver.isValueAliasDeclaration(node)) {
return undefined;
}
const newExportClause = visitNode(node.exportClause, visitor, isNamedExports, /*optional*/ true);
if (node.exportClause === newExportClause) {
return node;
}
return newExportClause
? createExportDeclaration(
/*decorators*/ undefined,
/*modifiers*/ undefined,
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;
}
function visitImportDeclaration(node: ImportDeclaration) {
if (node.importClause) {
const newImportClause = visitNode(node.importClause, visitor, isImportClause);
if (!newImportClause.name && !newImportClause.namedBindings) {
return undefined;
}
else if (newImportClause !== node.importClause) {
return createImportDeclaration(
/*decorators*/ undefined,
/*modifiers*/ undefined,
newImportClause,
node.moduleSpecifier);
}
}
return node;
}
function visitImportClause(node: ImportClause): ImportClause {
let newDefaultImport = node.name;
if (!resolver.isReferencedAliasDeclaration(node)) {
newDefaultImport = undefined;
}
const newNamedBindings = visitNode(node.namedBindings, visitor, isNamedImportBindings, /*optional*/ true);
return newDefaultImport !== node.name || newNamedBindings !== node.namedBindings
? createImportClause(newDefaultImport, newNamedBindings)
: node;
}
function visitNamedBindings(node: NamedImportBindings): VisitResult<NamedImportBindings> {
if (node.kind === SyntaxKind.NamespaceImport) {
return resolver.isReferencedAliasDeclaration(node) ? node : undefined;
}
else {
const newNamedImportElements = visitNodes((<NamedImports>node).elements, visitor, isImportSpecifier);
if (!newNamedImportElements || newNamedImportElements.length == 0) {
return undefined;
}
if (newNamedImportElements === (<NamedImports>node).elements) {
return node;
}
return createNamedImports(newNamedImportElements);
}
}
function visitImportSpecifier(node: ImportSpecifier) {
return resolver.isReferencedAliasDeclaration(node) ? node : undefined;
}
}
}