/// <reference path="checker.ts"/>

/* @internal */

namespace ts {

interface ModuleElementDeclarationEmitInfo {

node: Node;

outputPos: number;

indent: number;

asynchronousOutput?: string; // If the output for alias was written asynchronously, the corresponding output

subModuleElementDeclarationEmitInfo?: ModuleElementDeclarationEmitInfo[];

isVisible?: boolean;

}

interface DeclarationEmit {

reportedDeclarationError: boolean;

moduleElementDeclarationEmitInfo: ModuleElementDeclarationEmitInfo[];

synchronousDeclarationOutput: string;

referencesOutput: string;

}

type GetSymbolAccessibilityDiagnostic = (symbolAccessibilityResult: SymbolAccessibilityResult) => SymbolAccessibilityDiagnostic;

interface EmitTextWriterWithSymbolWriter extends EmitTextWriter {

getSymbolAccessibilityDiagnostic: GetSymbolAccessibilityDiagnostic;

}

interface SymbolAccessibilityDiagnostic {

errorNode: Node;

diagnosticMessage: DiagnosticMessage;

typeName?: DeclarationName | QualifiedName;

}

export function getDeclarationDiagnostics(host: EmitHost, resolver: EmitResolver, targetSourceFile: SourceFile): Diagnostic[] {

const declarationDiagnostics = createDiagnosticCollection();

forEachEmittedFile(host, getDeclarationDiagnosticsFromFile, targetSourceFile);

return declarationDiagnostics.getDiagnostics(targetSourceFile ? targetSourceFile.fileName : undefined);

function getDeclarationDiagnosticsFromFile({ declarationFilePath }: EmitFileNames, sourceFileOrBundle: SourceFile | Bundle) {

emitDeclarations(host, resolver, declarationDiagnostics, declarationFilePath, sourceFileOrBundle, /*emitOnlyDtsFiles*/ false);

}

}

function emitDeclarations(host: EmitHost, resolver: EmitResolver, emitterDiagnostics: DiagnosticCollection, declarationFilePath: string,

sourceFileOrBundle: SourceFile | Bundle, emitOnlyDtsFiles: boolean): DeclarationEmit {

const sourceFiles = sourceFileOrBundle.kind === SyntaxKind.Bundle ? sourceFileOrBundle.sourceFiles : [sourceFileOrBundle];

const isBundledEmit = sourceFileOrBundle.kind === SyntaxKind.Bundle;

const newLine = host.getNewLine();

const compilerOptions = host.getCompilerOptions();

let write: (s: string) => void;

let writeLine: () => void;

let increaseIndent: () => void;

let decreaseIndent: () => void;

let writeTextOfNode: (text: string, node: Node) => void;

let writer: EmitTextWriterWithSymbolWriter;

createAndSetNewTextWriterWithSymbolWriter();

let enclosingDeclaration: Node;

let resultHasExternalModuleIndicator: boolean;

let currentText: string;

let currentLineMap: ReadonlyArray<number>;

let currentIdentifiers: Map<string>;

let isCurrentFileExternalModule: boolean;

let reportedDeclarationError = false;

let errorNameNode: DeclarationName | QualifiedName;

const emitJsDocComments = compilerOptions.removeComments ? noop : writeJsDocComments;

const emit = compilerOptions.stripInternal ? stripInternal : emitNode;

let needsDeclare = true;

let moduleElementDeclarationEmitInfo: ModuleElementDeclarationEmitInfo[] = [];

let asynchronousSubModuleDeclarationEmitInfo: ModuleElementDeclarationEmitInfo[];

// Contains the reference paths that needs to go in the declaration file.

// Collecting this separately because reference paths need to be first thing in the declaration file

// and we could be collecting these paths from multiple files into single one with --out option

let referencesOutput = "";

let usedTypeDirectiveReferences: Map<string>;

// Emit references corresponding to each file

const emittedReferencedFiles: SourceFile[] = [];

let addedGlobalFileReference = false;

let allSourcesModuleElementDeclarationEmitInfo: ModuleElementDeclarationEmitInfo[] = [];

forEach(sourceFiles, sourceFile => {

// Dont emit for javascript file

if (isSourceFileJavaScript(sourceFile)) {

return;

}

// Check what references need to be added

if (!compilerOptions.noResolve) {

forEach(sourceFile.referencedFiles, fileReference => {

const referencedFile = tryResolveScriptReference(host, sourceFile, fileReference);

// Emit reference in dts, if the file reference was not already emitted

if (referencedFile && !contains(emittedReferencedFiles, referencedFile)) {

// Add a reference to generated dts file,

// global file reference is added only

// - if it is not bundled emit (because otherwise it would be self reference)

// - and it is not already added

if (writeReferencePath(referencedFile, !isBundledEmit && !addedGlobalFileReference, emitOnlyDtsFiles)) {

addedGlobalFileReference = true;

}

emittedReferencedFiles.push(referencedFile);

}

});

}

resultHasExternalModuleIndicator = false;

if (!isBundledEmit || !isExternalModule(sourceFile)) {

needsDeclare = true;

emitSourceFile(sourceFile);

}

else if (isExternalModule(sourceFile)) {

needsDeclare = false;

write(`declare module "${getResolvedExternalModuleName(host, sourceFile)}" {`);

writeLine();

increaseIndent();

emitSourceFile(sourceFile);

decreaseIndent();

write("}");

writeLine();

}

// create asynchronous output for the importDeclarations

if (moduleElementDeclarationEmitInfo.length) {

const oldWriter = writer;

forEach(moduleElementDeclarationEmitInfo, aliasEmitInfo => {

if (aliasEmitInfo.isVisible && !aliasEmitInfo.asynchronousOutput) {

Debug.assert(aliasEmitInfo.node.kind === SyntaxKind.ImportDeclaration);

createAndSetNewTextWriterWithSymbolWriter();

Debug.assert(aliasEmitInfo.indent === 0 || (aliasEmitInfo.indent === 1 && isBundledEmit));

for (let i = 0; i < aliasEmitInfo.indent; i++) {

increaseIndent();

}

writeImportDeclaration(<ImportDeclaration>aliasEmitInfo.node);

aliasEmitInfo.asynchronousOutput = writer.getText();

for (let i = 0; i < aliasEmitInfo.indent; i++) {

decreaseIndent();

}

}

});

setWriter(oldWriter);

allSourcesModuleElementDeclarationEmitInfo = allSourcesModuleElementDeclarationEmitInfo.concat(moduleElementDeclarationEmitInfo);

moduleElementDeclarationEmitInfo = [];

}

if (!isBundledEmit && isExternalModule(sourceFile) && !resultHasExternalModuleIndicator) {

// if file was external module this fact should be preserved in .d.ts as well.

// in case if we didn't write any external module specifiers in .d.ts we need to emit something

// that will force compiler to think that this file is an external module - 'export {}' is a reasonable choice here.

write("export {};");

writeLine();

}

});

if (usedTypeDirectiveReferences) {

forEachKey(usedTypeDirectiveReferences, directive => {

referencesOutput += `/// <reference types="${directive}" />${newLine}`;

});

}

return {

reportedDeclarationError,

moduleElementDeclarationEmitInfo: allSourcesModuleElementDeclarationEmitInfo,

synchronousDeclarationOutput: writer.getText(),

referencesOutput,

};

function hasInternalAnnotation(range: CommentRange) {

const comment = currentText.substring(range.pos, range.end);

return stringContains(comment, "@internal");

}

function stripInternal(node: Node) {

if (node) {

const leadingCommentRanges = getLeadingCommentRanges(currentText, node.pos);

if (forEach(leadingCommentRanges, hasInternalAnnotation)) {

return;

}

emitNode(node);

}

}

function createAndSetNewTextWriterWithSymbolWriter(): void {

const writer = <EmitTextWriterWithSymbolWriter>createTextWriter(newLine);

writer.trackSymbol = trackSymbol;

writer.reportInaccessibleThisError = reportInaccessibleThisError;

writer.reportInaccessibleUniqueSymbolError = reportInaccessibleUniqueSymbolError;

writer.reportPrivateInBaseOfClassExpression = reportPrivateInBaseOfClassExpression;

writer.writeKeyword = writer.write;

writer.writeOperator = writer.write;

writer.writePunctuation = writer.write;

writer.writeSpace = writer.write;

writer.writeStringLiteral = writer.writeLiteral;

writer.writeParameter = writer.write;

writer.writeProperty = writer.write;

writer.writeSymbol = writer.write;

setWriter(writer);

}

function setWriter(newWriter: EmitTextWriterWithSymbolWriter) {

writer = newWriter;

write = newWriter.write;

writeTextOfNode = newWriter.writeTextOfNode;

writeLine = newWriter.writeLine;

increaseIndent = newWriter.increaseIndent;

decreaseIndent = newWriter.decreaseIndent;

}

function writeAsynchronousModuleElements(nodes: ReadonlyArray<Node>) {

const oldWriter = writer;

forEach(nodes, declaration => {

let nodeToCheck: Node;

if (declaration.kind === SyntaxKind.VariableDeclaration) {

nodeToCheck = declaration.parent.parent;

}

else if (declaration.kind === SyntaxKind.NamedImports || declaration.kind === SyntaxKind.ImportSpecifier || declaration.kind === SyntaxKind.ImportClause) {

Debug.fail("We should be getting ImportDeclaration instead to write");

}

else {

nodeToCheck = declaration;

}

let moduleElementEmitInfo = forEach(moduleElementDeclarationEmitInfo, declEmitInfo => declEmitInfo.node === nodeToCheck ? declEmitInfo : undefined);

if (!moduleElementEmitInfo && asynchronousSubModuleDeclarationEmitInfo) {

moduleElementEmitInfo = forEach(asynchronousSubModuleDeclarationEmitInfo, declEmitInfo => declEmitInfo.node === nodeToCheck ? declEmitInfo : undefined);

}

// If the alias was marked as not visible when we saw its declaration, we would have saved the aliasEmitInfo, but if we haven't yet visited the alias declaration

// then we don't need to write it at this point. We will write it when we actually see its declaration

// Eg.

// export function bar(a: foo.Foo) { }

// import foo = require("foo");

// Writing of function bar would mark alias declaration foo as visible but we haven't yet visited that declaration so do nothing,

// we would write alias foo declaration when we visit it since it would now be marked as visible

if (moduleElementEmitInfo) {

if (moduleElementEmitInfo.node.kind === SyntaxKind.ImportDeclaration) {

// we have to create asynchronous output only after we have collected complete information

// because it is possible to enable multiple bindings as asynchronously visible

moduleElementEmitInfo.isVisible = true;

}

else {

createAndSetNewTextWriterWithSymbolWriter();

for (let declarationIndent = moduleElementEmitInfo.indent; declarationIndent; declarationIndent--) {

increaseIndent();

}

if (nodeToCheck.kind === SyntaxKind.ModuleDeclaration) {

Debug.assert(asynchronousSubModuleDeclarationEmitInfo === undefined);

asynchronousSubModuleDeclarationEmitInfo = [];

}

writeModuleElement(nodeToCheck);

if (nodeToCheck.kind === SyntaxKind.ModuleDeclaration) {

moduleElementEmitInfo.subModuleElementDeclarationEmitInfo = asynchronousSubModuleDeclarationEmitInfo;

asynchronousSubModuleDeclarationEmitInfo = undefined;

}

moduleElementEmitInfo.asynchronousOutput = writer.getText();

}

}

});

setWriter(oldWriter);

}

function recordTypeReferenceDirectivesIfNecessary(typeReferenceDirectives: string[]): void {

if (!typeReferenceDirectives) {

return;

}

if (!usedTypeDirectiveReferences) {

usedTypeDirectiveReferences = createMap<string>();

}

for (const directive of typeReferenceDirectives) {

if (!usedTypeDirectiveReferences.has(directive)) {

usedTypeDirectiveReferences.set(directive, directive);

}

}

}

function handleSymbolAccessibilityError(symbolAccessibilityResult: SymbolAccessibilityResult) {

if (symbolAccessibilityResult.accessibility === SymbolAccessibility.Accessible) {

// write the aliases

if (symbolAccessibilityResult && symbolAccessibilityResult.aliasesToMakeVisible) {

writeAsynchronousModuleElements(symbolAccessibilityResult.aliasesToMakeVisible);

}

}

else {

// Report error

reportedDeclarationError = true;

const errorInfo = writer.getSymbolAccessibilityDiagnostic(symbolAccessibilityResult);

if (errorInfo) {

if (errorInfo.typeName) {

emitterDiagnostics.add(createDiagnosticForNode(symbolAccessibilityResult.errorNode || errorInfo.errorNode,

errorInfo.diagnosticMessage,

getTextOfNodeFromSourceText(currentText, errorInfo.typeName),

symbolAccessibilityResult.errorSymbolName,

symbolAccessibilityResult.errorModuleName));

}

else {

emitterDiagnostics.add(createDiagnosticForNode(symbolAccessibilityResult.errorNode || errorInfo.errorNode,

errorInfo.diagnosticMessage,

symbolAccessibilityResult.errorSymbolName,

symbolAccessibilityResult.errorModuleName));

}

}

}

}

function trackSymbol(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags) {

handleSymbolAccessibilityError(resolver.isSymbolAccessible(symbol, enclosingDeclaration, meaning, /*shouldComputeAliasesToMakeVisible*/ true));

recordTypeReferenceDirectivesIfNecessary(resolver.getTypeReferenceDirectivesForSymbol(symbol, meaning));

}

function reportPrivateInBaseOfClassExpression(propertyName: string) {

if (errorNameNode) {

reportedDeclarationError = true;

emitterDiagnostics.add(

createDiagnosticForNode(errorNameNode, Diagnostics.Property_0_of_exported_class_expression_may_not_be_private_or_protected, propertyName));

}

}

function reportInaccessibleUniqueSymbolError() {

if (errorNameNode) {

reportedDeclarationError = true;

emitterDiagnostics.add(createDiagnosticForNode(errorNameNode, Diagnostics.The_inferred_type_of_0_references_an_inaccessible_1_type_A_type_annotation_is_necessary,

declarationNameToString(errorNameNode),

"unique symbol"));

}

}

function reportInaccessibleThisError() {

if (errorNameNode) {

reportedDeclarationError = true;

emitterDiagnostics.add(createDiagnosticForNode(errorNameNode, Diagnostics.The_inferred_type_of_0_references_an_inaccessible_1_type_A_type_annotation_is_necessary,

declarationNameToString(errorNameNode),

"this"));

}

}

function writeTypeOfDeclaration(declaration: AccessorDeclaration | VariableLikeDeclaration, type: TypeNode, getSymbolAccessibilityDiagnostic: GetSymbolAccessibilityDiagnostic) {

writer.getSymbolAccessibilityDiagnostic = getSymbolAccessibilityDiagnostic;

write(": ");

// use the checker's type, not the declared type,

// for optional parameter properties

// and also for non-optional initialized parameters that aren't a parameter property

// these types may need to add `undefined`.

const shouldUseResolverType = declaration.kind === SyntaxKind.Parameter &&

(resolver.isRequiredInitializedParameter(declaration as ParameterDeclaration) ||

resolver.isOptionalUninitializedParameterProperty(declaration as ParameterDeclaration));

if (type && !shouldUseResolverType) {

// Write the type

emitType(type);

}

else {

errorNameNode = declaration.name;

const format = TypeFormatFlags.UseTypeOfFunction | TypeFormatFlags.UseStructuralFallback |

TypeFormatFlags.WriteClassExpressionAsTypeLiteral |

(shouldUseResolverType ? TypeFormatFlags.AddUndefined : 0);

resolver.writeTypeOfDeclaration(declaration, enclosingDeclaration, format, writer);

errorNameNode = undefined;

}

}

function writeReturnTypeAtSignature(signature: SignatureDeclaration, getSymbolAccessibilityDiagnostic: GetSymbolAccessibilityDiagnostic) {

writer.getSymbolAccessibilityDiagnostic = getSymbolAccessibilityDiagnostic;

write(": ");

if (signature.type) {

// Write the type

emitType(signature.type);

}

else {

errorNameNode = signature.name;

resolver.writeReturnTypeOfSignatureDeclaration(

signature,

enclosingDeclaration,

TypeFormatFlags.UseTypeOfFunction | TypeFormatFlags.UseStructuralFallback | TypeFormatFlags.WriteClassExpressionAsTypeLiteral,

writer);

errorNameNode = undefined;

}

}

function emitLines(nodes: ReadonlyArray<Node>) {

for (const node of nodes) {

emit(node);

}

}

function emitSeparatedList(nodes: ReadonlyArray<Node>, separator: string, eachNodeEmitFn: (node: Node) => void, canEmitFn?: (node: Node) => boolean) {

let currentWriterPos = writer.getTextPos();

for (const node of nodes) {

if (!canEmitFn || canEmitFn(node)) {

if (currentWriterPos !== writer.getTextPos()) {

write(separator);

}

currentWriterPos = writer.getTextPos();

eachNodeEmitFn(node);

}

}

}

function emitCommaList(nodes: ReadonlyArray<Node>, eachNodeEmitFn: (node: Node) => void, canEmitFn?: (node: Node) => boolean) {

emitSeparatedList(nodes, ", ", eachNodeEmitFn, canEmitFn);

}

function writeJsDocComments(declaration: Node) {

if (declaration) {

const jsDocComments = getJSDocCommentRanges(declaration, currentText);

emitNewLineBeforeLeadingComments(currentLineMap, writer, declaration, jsDocComments);

// jsDoc comments are emitted at /*leading comment1 */space/*leading comment*/space

emitComments(currentText, currentLineMap, writer, jsDocComments, /*leadingSeparator*/ false, /*trailingSeparator*/ true, newLine, writeCommentRange);

}

}

function emitTypeWithNewGetSymbolAccessibilityDiagnostic(type: TypeNode | EntityName, getSymbolAccessibilityDiagnostic: GetSymbolAccessibilityDiagnostic) {

writer.getSymbolAccessibilityDiagnostic = getSymbolAccessibilityDiagnostic;

emitType(type);

}

function emitType(type: TypeNode | Identifier | QualifiedName) {

switch (type.kind) {

case SyntaxKind.AnyKeyword:

case SyntaxKind.StringKeyword:

case SyntaxKind.NumberKeyword:

case SyntaxKind.BooleanKeyword:

case SyntaxKind.ObjectKeyword:

case SyntaxKind.SymbolKeyword:

case SyntaxKind.VoidKeyword:

case SyntaxKind.UndefinedKeyword:

case SyntaxKind.NullKeyword:

case SyntaxKind.NeverKeyword:

case SyntaxKind.ThisType:

case SyntaxKind.LiteralType:

return writeTextOfNode(currentText, type);

case SyntaxKind.ExpressionWithTypeArguments:

return emitExpressionWithTypeArguments(<ExpressionWithTypeArguments>type);

case SyntaxKind.TypeReference:

return emitTypeReference(<TypeReferenceNode>type);

case SyntaxKind.TypeQuery:

return emitTypeQuery(<TypeQueryNode>type);

case SyntaxKind.ArrayType:

return emitArrayType(<ArrayTypeNode>type);

case SyntaxKind.TupleType:

return emitTupleType(<TupleTypeNode>type);

case SyntaxKind.UnionType:

return emitUnionType(<UnionTypeNode>type);

case SyntaxKind.IntersectionType:

return emitIntersectionType(<IntersectionTypeNode>type);

case SyntaxKind.ConditionalType:

return emitConditionalType(<ConditionalTypeNode>type);

case SyntaxKind.InferType:

return emitInferType(<InferTypeNode>type);

case SyntaxKind.ParenthesizedType:

return emitParenType(<ParenthesizedTypeNode>type);

case SyntaxKind.TypeOperator:

return emitTypeOperator(<TypeOperatorNode>type);

case SyntaxKind.IndexedAccessType:

return emitIndexedAccessType(<IndexedAccessTypeNode>type);

case SyntaxKind.MappedType:

return emitMappedType(<MappedTypeNode>type);

case SyntaxKind.FunctionType:

case SyntaxKind.ConstructorType:

return emitSignatureDeclarationWithJsDocComments(<FunctionOrConstructorTypeNode>type);

case SyntaxKind.TypeLiteral:

return emitTypeLiteral(<TypeLiteralNode>type);

case SyntaxKind.Identifier:

return emitEntityName(<Identifier>type);

case SyntaxKind.QualifiedName:

return emitEntityName(<QualifiedName>type);

case SyntaxKind.TypePredicate:

return emitTypePredicate(<TypePredicateNode>type);

}

function writeEntityName(entityName: EntityName | Expression) {

if (entityName.kind === SyntaxKind.Identifier) {

writeTextOfNode(currentText, entityName);

}

else {

const left = entityName.kind === SyntaxKind.QualifiedName ? (<QualifiedName>entityName).left : (<PropertyAccessExpression>entityName).expression;

const right = entityName.kind === SyntaxKind.QualifiedName ? (<QualifiedName>entityName).right : (<PropertyAccessExpression>entityName).name;

writeEntityName(left);

write(".");

writeTextOfNode(currentText, right);

}

}

function emitEntityName(entityName: EntityNameOrEntityNameExpression) {

const visibilityResult = resolver.isEntityNameVisible(entityName,

// Aliases can be written asynchronously so use correct enclosing declaration

entityName.parent.kind === SyntaxKind.ImportEqualsDeclaration ? entityName.parent : enclosingDeclaration);

handleSymbolAccessibilityError(visibilityResult);

recordTypeReferenceDirectivesIfNecessary(resolver.getTypeReferenceDirectivesForEntityName(entityName));

writeEntityName(entityName);

}

function emitExpressionWithTypeArguments(node: ExpressionWithTypeArguments) {

if (isEntityNameExpression(node.expression)) {

Debug.assert(node.expression.kind === SyntaxKind.Identifier || node.expression.kind === SyntaxKind.PropertyAccessExpression);

emitEntityName(node.expression);

if (node.typeArguments) {

write("<");

emitCommaList(node.typeArguments, emitType);

write(">");

}

}

}

function emitTypeReference(type: TypeReferenceNode) {

emitEntityName(type.typeName);

if (type.typeArguments) {

write("<");

emitCommaList(type.typeArguments, emitType);

write(">");

}

}

function emitTypePredicate(type: TypePredicateNode) {

writeTextOfNode(currentText, type.parameterName);

write(" is ");

emitType(type.type);

}

function emitTypeQuery(type: TypeQueryNode) {

write("typeof ");

emitEntityName(type.exprName);

}

function emitArrayType(type: ArrayTypeNode) {

emitType(type.elementType);

write("[]");

}

function emitTupleType(type: TupleTypeNode) {

write("[");

emitCommaList(type.elementTypes, emitType);

write("]");

}

function emitUnionType(type: UnionTypeNode) {

emitSeparatedList(type.types, " | ", emitType);

}

function emitIntersectionType(type: IntersectionTypeNode) {

emitSeparatedList(type.types, " & ", emitType);

}

function emitConditionalType(node: ConditionalTypeNode) {

emitType(node.checkType);

write(" extends ");

emitType(node.extendsType);

write(" ? ");

const prevEnclosingDeclaration = enclosingDeclaration;

enclosingDeclaration = node.trueType;

emitType(node.trueType);

enclosingDeclaration = prevEnclosingDeclaration;

write(" : ");

emitType(node.falseType);

}

function emitInferType(node: InferTypeNode) {

write("infer ");

writeTextOfNode(currentText, node.typeParameter.name);

}

function emitParenType(type: ParenthesizedTypeNode) {

write("(");

emitType(type.type);

write(")");

}

function emitTypeOperator(type: TypeOperatorNode) {

write(tokenToString(type.operator));

write(" ");

emitType(type.type);

}

function emitIndexedAccessType(node: IndexedAccessTypeNode) {

emitType(node.objectType);

write("[");

emitType(node.indexType);

write("]");

}

function emitMappedType(node: MappedTypeNode) {

const prevEnclosingDeclaration = enclosingDeclaration;

enclosingDeclaration = node;

write("{");

writeLine();

increaseIndent();

if (node.readonlyToken) {

write("readonly ");

}

write("[");

writeEntityName(node.typeParameter.name);

write(" in ");

emitType(node.typeParameter.constraint);

write("]");

if (node.questionToken) {

write("?");

}

write(": ");

emitType(node.type);

write(";");

writeLine();

decreaseIndent();

write("}");

enclosingDeclaration = prevEnclosingDeclaration;

}

function emitTypeLiteral(type: TypeLiteralNode) {

write("{");

if (type.members.length) {

writeLine();

increaseIndent();

// write members

emitLines(type.members);

decreaseIndent();

}

write("}");

}

}

function emitSourceFile(node: SourceFile) {

currentText = node.text;

currentLineMap = getLineStarts(node);

currentIdentifiers = node.identifiers;

isCurrentFileExternalModule = isExternalModule(node);

enclosingDeclaration = node;

emitDetachedComments(currentText, currentLineMap, writer, writeCommentRange, node, newLine, /*removeComments*/ true);

emitLines(node.statements);

}

// Return a temp variable name to be used in `export default`/`export class ... extends` statements.

// The temp name will be of the form _default_counter.

// Note that export default is only allowed at most once in a module, so we

// do not need to keep track of created temp names.

function getExportTempVariableName(baseName: string): string {

if (!currentIdentifiers.has(baseName)) {

return baseName;

}

let count = 0;

while (true) {

count++;

const name = baseName + "_" + count;

if (!currentIdentifiers.has(name)) {

return name;

}

}

}

function emitTempVariableDeclaration(expr: Expression, baseName: string, diagnostic: SymbolAccessibilityDiagnostic, needsDeclare: boolean): string {

const tempVarName = getExportTempVariableName(baseName);

if (needsDeclare) {

write("declare ");

}

write("const ");

write(tempVarName);

write(": ");

writer.getSymbolAccessibilityDiagnostic = () => diagnostic;

resolver.writeTypeOfExpression(

expr,

enclosingDeclaration,

TypeFormatFlags.UseTypeOfFunction | TypeFormatFlags.UseStructuralFallback | TypeFormatFlags.WriteClassExpressionAsTypeLiteral,

writer);

write(";");

writeLine();

return tempVarName;

}

function emitExportAssignment(node: ExportAssignment) {

if (isSourceFile(node.parent)) {

resultHasExternalModuleIndicator = true; // Top-level exports are external module indicators

}

if (node.expression.kind === SyntaxKind.Identifier) {

write(node.isExportEquals ? "export = " : "export default ");

writeTextOfNode(currentText, node.expression);

}

else {

const tempVarName = emitTempVariableDeclaration(node.expression, "_default", {

diagnosticMessage: Diagnostics.Default_export_of_the_module_has_or_is_using_private_name_0,

errorNode: node

}, needsDeclare);

write(node.isExportEquals ? "export = " : "export default ");

write(tempVarName);

}

write(";");

writeLine();

// Make all the declarations visible for the export name

if (node.expression.kind === SyntaxKind.Identifier) {

const nodes = resolver.collectLinkedAliases(<Identifier>node.expression);

// write each of these declarations asynchronously

writeAsynchronousModuleElements(nodes);

}

}

function isModuleElementVisible(node: Declaration) {

return resolver.isDeclarationVisible(node);

}

function emitModuleElement(node: Node, isModuleElementVisible: boolean) {

if (isModuleElementVisible) {

writeModuleElement(node);

}

// Import equals declaration in internal module can become visible as part of any emit so lets make sure we add these irrespective

else if (node.kind === SyntaxKind.ImportEqualsDeclaration ||

(node.parent.kind === SyntaxKind.SourceFile && isCurrentFileExternalModule)) {

let isVisible: boolean;

if (asynchronousSubModuleDeclarationEmitInfo && node.parent.kind !== SyntaxKind.SourceFile) {

// Import declaration of another module that is visited async so lets put it in right spot

asynchronousSubModuleDeclarationEmitInfo.push({

node,

outputPos: writer.getTextPos(),

indent: writer.getIndent(),

isVisible

});

}

else {

if (node.kind === SyntaxKind.ImportDeclaration) {

const importDeclaration = <ImportDeclaration>node;

if (importDeclaration.importClause) {

isVisible = (importDeclaration.importClause.name && resolver.isDeclarationVisible(importDeclaration.importClause)) ||

isVisibleNamedBinding(importDeclaration.importClause.namedBindings);

}

}

moduleElementDeclarationEmitInfo.push({

node,

outputPos: writer.getTextPos(),

indent: writer.getIndent(),

isVisible

});

}

}

}

function writeModuleElement(node: Node) {

switch (node.kind) {

case SyntaxKind.FunctionDeclaration:

return writeFunctionDeclaration(<FunctionLikeDeclaration>node);

case SyntaxKind.VariableStatement:

return writeVariableStatement(<VariableStatement>node);

case SyntaxKind.InterfaceDeclaration:

return writeInterfaceDeclaration(<InterfaceDeclaration>node);

case SyntaxKind.ClassDeclaration:

return writeClassDeclaration(<ClassDeclaration>node);

case SyntaxKind.TypeAliasDeclaration:

return writeTypeAliasDeclaration(<TypeAliasDeclaration>node);

case SyntaxKind.EnumDeclaration:

return writeEnumDeclaration(<EnumDeclaration>node);

case SyntaxKind.ModuleDeclaration:

return writeModuleDeclaration(<ModuleDeclaration>node);

case SyntaxKind.ImportEqualsDeclaration:

return writeImportEqualsDeclaration(<ImportEqualsDeclaration>node);

case SyntaxKind.ImportDeclaration:

return writeImportDeclaration(<ImportDeclaration>node);

default:

Debug.fail("Unknown symbol kind");

}

}

function emitModuleElementDeclarationFlags(node: Node) {

// If the node is parented in the current source file we need to emit export declare or just export

if (node.parent.kind === SyntaxKind.SourceFile) {

const modifiers = getModifierFlags(node);

// If the node is exported

if (modifiers & ModifierFlags.Export) {

resultHasExternalModuleIndicator = true; // Top-level exports are external module indicators

write("export ");

}

if (modifiers & ModifierFlags.Default) {

write("default ");

}

else if (node.kind !== SyntaxKind.InterfaceDeclaration && needsDeclare) {

write("declare ");

}

}

}

function emitClassMemberDeclarationFlags(flags: ModifierFlags) {

if (flags & ModifierFlags.Private) {

write("private ");

}

else if (flags & ModifierFlags.Protected) {

write("protected ");

}

if (flags & ModifierFlags.Static) {

write("static ");

}

if (flags & ModifierFlags.Readonly) {

write("readonly ");

}

if (flags & ModifierFlags.Abstract) {

write("abstract ");

}

}

function writeImportEqualsDeclaration(node: ImportEqualsDeclaration) {

// note usage of writer. methods instead of aliases created, just to make sure we are using

// correct writer especially to handle asynchronous alias writing

emitJsDocComments(node);

if (hasModifier(node, ModifierFlags.Export)) {

write("export ");

}

write("import ");

writeTextOfNode(currentText, node.name);

write(" = ");

if (isInternalModuleImportEqualsDeclaration(node)) {

emitTypeWithNewGetSymbolAccessibilityDiagnostic(<EntityName>node.moduleReference, getImportEntityNameVisibilityError);

write(";");

}

else {

write("require(");

emitExternalModuleSpecifier(node);

write(");");

}

writer.writeLine();

function getImportEntityNameVisibilityError(): SymbolAccessibilityDiagnostic {

return {

diagnosticMessage: Diagnostics.Import_declaration_0_is_using_private_name_1,

errorNode: node,

typeName: node.name

};

}

}

function isVisibleNamedBinding(namedBindings: NamespaceImport | NamedImports): boolean {

if (namedBindings) {

if (namedBindings.kind === SyntaxKind.NamespaceImport) {

return resolver.isDeclarationVisible(<NamespaceImport>namedBindings);

}

else {

return forEach((<NamedImports>namedBindings).elements, namedImport => resolver.isDeclarationVisible(namedImport));

}

}

}

function writeImportDeclaration(node: ImportDeclaration) {

emitJsDocComments(node);

if (hasModifier(node, ModifierFlags.Export)) {

write("export ");

}

write("import ");

if (node.importClause) {

const currentWriterPos = writer.getTextPos();

if (node.importClause.name && resolver.isDeclarationVisible(node.importClause)) {

writeTextOfNode(currentText, node.importClause.name);

}

if (node.importClause.namedBindings && isVisibleNamedBinding(node.importClause.namedBindings)) {

if (currentWriterPos !== writer.getTextPos()) {

// If the default binding was emitted, write the separated

write(", ");

}

if (node.importClause.namedBindings.kind === SyntaxKind.NamespaceImport) {

write("* as ");

writeTextOfNode(currentText, (<NamespaceImport>node.importClause.namedBindings).name);

}

else {

write("{ ");

emitCommaList((<NamedImports>node.importClause.namedBindings).elements, emitImportOrExportSpecifier, resolver.isDeclarationVisible);

write(" }");

}

}

write(" from ");

}

emitExternalModuleSpecifier(node);

write(";");

writer.writeLine();

}

function emitExternalModuleSpecifier(parent: ImportEqualsDeclaration | ImportDeclaration | ExportDeclaration | ModuleDeclaration) {

// emitExternalModuleSpecifier is usually called when we emit something in the.d.ts file that will make it an external module (i.e. import/export declarations).

// the only case when it is not true is when we call it to emit correct name for module augmentation - d.ts files with just module augmentations are not considered

// external modules since they are indistinguishable from script files with ambient modules. To fix this in such d.ts files we'll emit top level 'export {}'

// so compiler will treat them as external modules.

resultHasExternalModuleIndicator = resultHasExternalModuleIndicator || parent.kind !== SyntaxKind.ModuleDeclaration;

let moduleSpecifier: Node;

if (parent.kind === SyntaxKind.ImportEqualsDeclaration) {

const node = parent as ImportEqualsDeclaration;

moduleSpecifier = getExternalModuleImportEqualsDeclarationExpression(node);

}

else if (parent.kind === SyntaxKind.ModuleDeclaration) {

moduleSpecifier = (<ModuleDeclaration>parent).name;

}

else {

const node = parent as (ImportDeclaration | ExportDeclaration);

moduleSpecifier = node.moduleSpecifier;

}

if (moduleSpecifier.kind === SyntaxKind.StringLiteral && isBundledEmit && (compilerOptions.out || compilerOptions.outFile)) {

const moduleName = getExternalModuleNameFromDeclaration(host, resolver, parent);

if (moduleName) {

write('"');

write(moduleName);

write('"');

return;

}

}

writeTextOfNode(currentText, moduleSpecifier);

}

function emitImportOrExportSpecifier(node: ImportOrExportSpecifier) {

if (node.propertyName) {

writeTextOfNode(currentText, node.propertyName);

write(" as ");

}

writeTextOfNode(currentText, node.name);

}

function emitExportSpecifier(node: ExportSpecifier) {

emitImportOrExportSpecifier(node);

// Make all the declarations visible for the export name

const nodes = resolver.collectLinkedAliases(node.propertyName || node.name);

// write each of these declarations asynchronously

writeAsynchronousModuleElements(nodes);

}

function emitExportDeclaration(node: ExportDeclaration) {

resultHasExternalModuleIndicator = true; // Top-level exports are external module indicators

emitJsDocComments(node);

write("export ");

if (node.exportClause) {

write("{ ");

emitCommaList(node.exportClause.elements, emitExportSpecifier);

write(" }");

}

else {

write("*");

}

if (node.moduleSpecifier) {

write(" from ");

emitExternalModuleSpecifier(node);

}

write(";");

writer.writeLine();

}

function writeModuleDeclaration(node: ModuleDeclaration) {

emitJsDocComments(node);

emitModuleElementDeclarationFlags(node);

if (isGlobalScopeAugmentation(node)) {

write("global ");

}

else {

if (node.flags & NodeFlags.Namespace) {

write("namespace ");

}

else {

write("module ");

}

if (isExternalModuleAugmentation(node)) {

emitExternalModuleSpecifier(node);

}

else {

writeTextOfNode(currentText, node.name);

}

}

while (node.body && node.body.kind !== SyntaxKind.ModuleBlock) {

node = <ModuleDeclaration>node.body;

write(".");

writeTextOfNode(currentText, node.name);

}

const prevEnclosingDeclaration = enclosingDeclaration;

if (node.body) {

enclosingDeclaration = node;

write(" {");

writeLine();

increaseIndent();

emitLines((<ModuleBlock>node.body).statements);

decreaseIndent();

write("}");

writeLine();

enclosingDeclaration = prevEnclosingDeclaration;

}

else {

write(";");

}

}

function writeTypeAliasDeclaration(node: TypeAliasDeclaration) {

const prevEnclosingDeclaration = enclosingDeclaration;

enclosingDeclaration = node;

emitJsDocComments(node);

emitModuleElementDeclarationFlags(node);

write("type ");

writeTextOfNode(currentText, node.name);

emitTypeParameters(node.typeParameters);

write(" = ");

emitTypeWithNewGetSymbolAccessibilityDiagnostic(node.type, getTypeAliasDeclarationVisibilityError);