var fileName = "tsconfig.json";

while (true) {

if (sys.fileExists(fileName)) {

return fileName;

}

var parentPath = getDirectoryPath(searchPath);

if (parentPath === searchPath) {

break;

}

searchPath = parentPath;

fileName = "../" + fileName;

}

return undefined;

let currentDirectory: string;

let existingDirectories: Map<boolean> = {};

function getCanonicalFileName(fileName: string): string {

// if underlying system can distinguish between two files whose names differs only in cases then file name already in canonical form.

// otherwise use toLowerCase as a canonical form.

return sys.useCaseSensitiveFileNames ? fileName : fileName.toLowerCase();

}

// returned by CScript sys environment

let unsupportedFileEncodingErrorCode = -2147024809;

function getSourceFile(fileName: string, languageVersion: ScriptTarget, onError?: (message: string) => void): SourceFile {

let text: string;

try {

let start = new Date().getTime();

text = sys.readFile(fileName, options.charset);

ioReadTime += new Date().getTime() - start;

}

catch (e) {

if (onError) {

onError(e.number === unsupportedFileEncodingErrorCode

? createCompilerDiagnostic(Diagnostics.Unsupported_file_encoding).messageText

: e.message);

}

text = "";

}

return text !== undefined ? createSourceFile(fileName, text, languageVersion, setParentNodes) : undefined;

}

function directoryExists(directoryPath: string): boolean {

if (hasProperty(existingDirectories, directoryPath)) {

return true;

}

if (sys.directoryExists(directoryPath)) {

existingDirectories[directoryPath] = true;

return true;

}

return false;

}

function ensureDirectoriesExist(directoryPath: string) {

if (directoryPath.length > getRootLength(directoryPath) && !directoryExists(directoryPath)) {

let parentDirectory = getDirectoryPath(directoryPath);

ensureDirectoriesExist(parentDirectory);

sys.createDirectory(directoryPath);

}

}

function writeFile(fileName: string, data: string, writeByteOrderMark: boolean, onError?: (message: string) => void) {

try {

var start = new Date().getTime();

ensureDirectoriesExist(getDirectoryPath(normalizePath(fileName)));

sys.writeFile(fileName, data, writeByteOrderMark);

ioWriteTime += new Date().getTime() - start;

}

catch (e) {

if (onError) {

onError(e.message);

}

}

}

const newLine = getNewLineCharacter(options);

return {

getSourceFile,

getDefaultLibFileName: options => combinePaths(getDirectoryPath(normalizePath(sys.getExecutingFilePath())), getDefaultLibFileName(options)),

writeFile,

getCurrentDirectory: () => currentDirectory || (currentDirectory = sys.getCurrentDirectory()),

useCaseSensitiveFileNames: () => sys.useCaseSensitiveFileNames,

getCanonicalFileName,

getNewLine: () => newLine

};

let diagnostics = program.getOptionsDiagnostics(cancellationToken).concat(

program.getSyntacticDiagnostics(sourceFile, cancellationToken),

program.getGlobalDiagnostics(cancellationToken),

program.getSemanticDiagnostics(sourceFile, cancellationToken));

if (program.getCompilerOptions().declaration) {

diagnostics.concat(program.getDeclarationDiagnostics(sourceFile, cancellationToken));

}

return sortAndDeduplicateDiagnostics(diagnostics);

if (typeof messageText === "string") {

return messageText;

}

else {

let diagnosticChain = messageText;

let result = "";

let indent = 0;

while (diagnosticChain) {

if (indent) {

result += newLine;

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

result += " ";

}

}

result += diagnosticChain.messageText;

indent++;

diagnosticChain = diagnosticChain.next;

}

return result;

}

let program: Program;

let files: SourceFile[] = [];

let diagnostics = createDiagnosticCollection();

let commonSourceDirectory: string;

let diagnosticsProducingTypeChecker: TypeChecker;

let noDiagnosticsTypeChecker: TypeChecker;

let classifiableNames: Map<string>;

let skipDefaultLib = options.noLib;

let start = new Date().getTime();

host = host || createCompilerHost(options);

let filesByName = createFileMap<SourceFile>(fileName => host.getCanonicalFileName(fileName));

forEach(rootNames, name => processRootFile(name, /*isDefaultLib:*/ false));

// Do not process the default library if:

// - The '--noLib' flag is used.

// - A 'no-default-lib' reference comment is encountered in

// processing the root files.

if (!skipDefaultLib) {

processRootFile(host.getDefaultLibFileName(options), /*isDefaultLib:*/ true);

}

verifyCompilerOptions();

programTime += new Date().getTime() - start;

program = {

getSourceFile: getSourceFile,

getSourceFiles: () => files,

getCompilerOptions: () => options,

getSyntacticDiagnostics,

getOptionsDiagnostics,

getGlobalDiagnostics,

getSemanticDiagnostics,

getDeclarationDiagnostics,

getTypeChecker,

getClassifiableNames,

getDiagnosticsProducingTypeChecker,

getCommonSourceDirectory: () => commonSourceDirectory,

emit,

getCurrentDirectory: () => host.getCurrentDirectory(),

getNodeCount: () => getDiagnosticsProducingTypeChecker().getNodeCount(),

getIdentifierCount: () => getDiagnosticsProducingTypeChecker().getIdentifierCount(),

getSymbolCount: () => getDiagnosticsProducingTypeChecker().getSymbolCount(),

getTypeCount: () => getDiagnosticsProducingTypeChecker().getTypeCount(),

};

return program;

function getClassifiableNames() {

if (!classifiableNames) {

// Initialize a checker so that all our files are bound.

getTypeChecker();

classifiableNames = {};

for (let sourceFile of files) {

copyMap(sourceFile.classifiableNames, classifiableNames);

}

}

return classifiableNames;

}

function getEmitHost(writeFileCallback?: WriteFileCallback): EmitHost {

return {

getCanonicalFileName: fileName => host.getCanonicalFileName(fileName),

getCommonSourceDirectory: program.getCommonSourceDirectory,

getCompilerOptions: program.getCompilerOptions,

getCurrentDirectory: () => host.getCurrentDirectory(),

getNewLine: () => host.getNewLine(),

getSourceFile: program.getSourceFile,

getSourceFiles: program.getSourceFiles,

writeFile: writeFileCallback || (

(fileName, data, writeByteOrderMark, onError) => host.writeFile(fileName, data, writeByteOrderMark, onError)),

};

}

function getDiagnosticsProducingTypeChecker() {

return diagnosticsProducingTypeChecker || (diagnosticsProducingTypeChecker = createTypeChecker(program, /*produceDiagnostics:*/ true));

}

function getTypeChecker() {

return noDiagnosticsTypeChecker || (noDiagnosticsTypeChecker = createTypeChecker(program, /*produceDiagnostics:*/ false));

}

function emit(sourceFile?: SourceFile, writeFileCallback?: WriteFileCallback, cancellationToken?: CancellationToken): EmitResult {

return runWithCancellationToken(() => emitWorker(this, sourceFile, writeFileCallback, cancellationToken));

}

function emitWorker(program: Program, sourceFile: SourceFile, writeFileCallback: WriteFileCallback, cancellationToken: CancellationToken): EmitResult {

// If the noEmitOnError flag is set, then check if we have any errors so far. If so,

// immediately bail out. Note that we pass 'undefined' for 'sourceFile' so that we

// get any preEmit diagnostics, not just the ones

if (options.noEmitOnError && getPreEmitDiagnostics(program, /*sourceFile:*/ undefined, cancellationToken).length > 0) {

return { diagnostics: [], sourceMaps: undefined, emitSkipped: true };

}

// Create the emit resolver outside of the "emitTime" tracking code below. That way

// any cost associated with it (like type checking) are appropriate associated with

// the type-checking counter.

//

// If the -out option is specified, we should not pass the source file to getEmitResolver.

// This is because in the -out scenario all files need to be emitted, and therefore all

// files need to be type checked. And the way to specify that all files need to be type

// checked is to not pass the file to getEmitResolver.

let emitResolver = getDiagnosticsProducingTypeChecker().getEmitResolver(options.out ? undefined : sourceFile);

let start = new Date().getTime();

let emitResult = emitFiles(

emitResolver,

getEmitHost(writeFileCallback),

sourceFile);

emitTime += new Date().getTime() - start;

return emitResult;

}

function getSourceFile(fileName: string) {

return filesByName.get(fileName);

}

function getDiagnosticsHelper(

sourceFile: SourceFile,

getDiagnostics: (sourceFile: SourceFile, cancellationToken: CancellationToken) => Diagnostic[],

cancellationToken: CancellationToken): Diagnostic[] {

if (sourceFile) {

return getDiagnostics(sourceFile, cancellationToken);

}

let allDiagnostics: Diagnostic[] = [];

forEach(program.getSourceFiles(), sourceFile => {

if (cancellationToken) {

cancellationToken.throwIfCancellationRequested();

}

addRange(allDiagnostics, getDiagnostics(sourceFile, cancellationToken));

});

return sortAndDeduplicateDiagnostics(allDiagnostics);

}

function getSyntacticDiagnostics(sourceFile: SourceFile, cancellationToken: CancellationToken): Diagnostic[] {

return getDiagnosticsHelper(sourceFile, getSyntacticDiagnosticsForFile, cancellationToken);

}

function getSemanticDiagnostics(sourceFile: SourceFile, cancellationToken: CancellationToken): Diagnostic[] {

return getDiagnosticsHelper(sourceFile, getSemanticDiagnosticsForFile, cancellationToken);

}

function getDeclarationDiagnostics(sourceFile: SourceFile, cancellationToken: CancellationToken): Diagnostic[] {

return getDiagnosticsHelper(sourceFile, getDeclarationDiagnosticsForFile, cancellationToken);

}

function getSyntacticDiagnosticsForFile(sourceFile: SourceFile, cancellationToken: CancellationToken): Diagnostic[] {

return sourceFile.parseDiagnostics;

}

function runWithCancellationToken<T>(func: () => T): T {

try {

return func();

}

catch (e) {

if (e instanceof OperationCanceledException) {

// We were canceled while performing the operation. Because our type checker

// might be a bad state, we need to throw it away.

//

// Note: we are overly agressive here. We do not actually *have* to throw away

// the "noDiagnosticsTypeChecker". However, for simplicity, i'd like to keep

// the lifetimes of these two TypeCheckers the same. Also, we generally only

// cancel when the user has made a change anyways. And, in that case, we (the

// program instance) will get thrown away anyways. So trying to keep one of

// these type checkers alive doesn't serve much purpose.

noDiagnosticsTypeChecker = undefined;

diagnosticsProducingTypeChecker = undefined;

}

throw e;

}

}

function getSemanticDiagnosticsForFile(sourceFile: SourceFile, cancellationToken: CancellationToken): Diagnostic[] {

return runWithCancellationToken(() => {

let typeChecker = getDiagnosticsProducingTypeChecker();

Debug.assert(!!sourceFile.bindDiagnostics);

let bindDiagnostics = sourceFile.bindDiagnostics;

let checkDiagnostics = typeChecker.getDiagnostics(sourceFile, cancellationToken);

let programDiagnostics = diagnostics.getDiagnostics(sourceFile.fileName);

return bindDiagnostics.concat(checkDiagnostics).concat(programDiagnostics);

});

}

function getDeclarationDiagnosticsForFile(sourceFile: SourceFile, cancellationToken: CancellationToken): Diagnostic[] {

return runWithCancellationToken(() => {

if (!isDeclarationFile(sourceFile)) {

let resolver = getDiagnosticsProducingTypeChecker().getEmitResolver(sourceFile, cancellationToken);

// Don't actually write any files since we're just getting diagnostics.

var writeFile: WriteFileCallback = () => { };

return ts.getDeclarationDiagnostics(getEmitHost(writeFile), resolver, sourceFile);

}

});

}

function getOptionsDiagnostics(): Diagnostic[] {

let allDiagnostics: Diagnostic[] = [];

addRange(allDiagnostics, diagnostics.getGlobalDiagnostics());

return sortAndDeduplicateDiagnostics(allDiagnostics);

}

function getGlobalDiagnostics(): Diagnostic[] {

let allDiagnostics: Diagnostic[] = [];

addRange(allDiagnostics, getDiagnosticsProducingTypeChecker().getGlobalDiagnostics());

return sortAndDeduplicateDiagnostics(allDiagnostics);

}

function hasExtension(fileName: string): boolean {

return getBaseFileName(fileName).indexOf(".") >= 0;

}

function processRootFile(fileName: string, isDefaultLib: boolean) {

processSourceFile(normalizePath(fileName), isDefaultLib);

}

function processSourceFile(fileName: string, isDefaultLib: boolean, refFile?: SourceFile, refPos?: number, refEnd?: number) {

let start: number;

let length: number;

let diagnosticArgument: string[];

if (refEnd !== undefined && refPos !== undefined) {

start = refPos;

length = refEnd - refPos;

}

let diagnostic: DiagnosticMessage;

if (hasExtension(fileName)) {

if (!options.allowNonTsExtensions && !forEach(supportedExtensions, extension => fileExtensionIs(host.getCanonicalFileName(fileName), extension))) {

diagnostic = Diagnostics.File_0_has_unsupported_extension_The_only_supported_extensions_are_1;

diagnosticArgument = [fileName, "'" + supportedExtensions.join("', '") + "'"];

}

else if (!findSourceFile(fileName, isDefaultLib, refFile, refPos, refEnd)) {

diagnostic = Diagnostics.File_0_not_found;

diagnosticArgument = [fileName];

}

else if (refFile && host.getCanonicalFileName(fileName) === host.getCanonicalFileName(refFile.fileName)) {

diagnostic = Diagnostics.A_file_cannot_have_a_reference_to_itself;

diagnosticArgument = [fileName];

}

}

else {

var nonTsFile: SourceFile = options.allowNonTsExtensions && findSourceFile(fileName, isDefaultLib, refFile, refPos, refEnd);

if (!nonTsFile) {

if (options.allowNonTsExtensions) {

diagnostic = Diagnostics.File_0_not_found;

diagnosticArgument = [fileName];

}

else if (!forEach(supportedExtensions, extension => findSourceFile(fileName + extension, isDefaultLib, refFile, refPos, refEnd))) {

diagnostic = Diagnostics.File_0_not_found;

fileName += ".ts";

diagnosticArgument = [fileName];

}

}

}

if (diagnostic) {

if (refFile) {

diagnostics.add(createFileDiagnostic(refFile, start, length, diagnostic, ...diagnosticArgument));

}

else {

diagnostics.add(createCompilerDiagnostic(diagnostic, ...diagnosticArgument));

}

}

}

// Get source file from normalized fileName

function findSourceFile(fileName: string, isDefaultLib: boolean, refFile?: SourceFile, refStart?: number, refLength?: number): SourceFile {

let canonicalName = host.getCanonicalFileName(normalizeSlashes(fileName));

if (filesByName.contains(canonicalName)) {

// We've already looked for this file, use cached result

return getSourceFileFromCache(fileName, canonicalName, /*useAbsolutePath*/ false);

}

else {

let normalizedAbsolutePath = getNormalizedAbsolutePath(fileName, host.getCurrentDirectory());

let canonicalAbsolutePath = host.getCanonicalFileName(normalizedAbsolutePath);

if (filesByName.contains(canonicalAbsolutePath)) {

return getSourceFileFromCache(normalizedAbsolutePath, canonicalAbsolutePath, /*useAbsolutePath*/ true);

}

// We haven't looked for this file, do so now and cache result

let file = host.getSourceFile(fileName, options.target, hostErrorMessage => {

if (refFile) {

diagnostics.add(createFileDiagnostic(refFile, refStart, refLength,

Diagnostics.Cannot_read_file_0_Colon_1, fileName, hostErrorMessage));

}

else {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Cannot_read_file_0_Colon_1, fileName, hostErrorMessage));

}

});

filesByName.set(canonicalName, file);

if (file) {

skipDefaultLib = skipDefaultLib || file.hasNoDefaultLib;

// Set the source file for normalized absolute path

filesByName.set(canonicalAbsolutePath, file);

if (!options.noResolve) {

let basePath = getDirectoryPath(fileName);

processReferencedFiles(file, basePath);

processImportedModules(file, basePath);

}

if (isDefaultLib) {

file.isDefaultLib = true;

files.unshift(file);

}

else {

files.push(file);

}

}

return file;

}

function getSourceFileFromCache(fileName: string, canonicalName: string, useAbsolutePath: boolean): SourceFile {

let file = filesByName.get(canonicalName);

if (file && host.useCaseSensitiveFileNames()) {

let sourceFileName = useAbsolutePath ? getNormalizedAbsolutePath(file.fileName, host.getCurrentDirectory()) : file.fileName;

if (canonicalName !== sourceFileName) {

diagnostics.add(createFileDiagnostic(refFile, refStart, refLength,

Diagnostics.File_name_0_differs_from_already_included_file_name_1_only_in_casing, fileName, sourceFileName));

}

}

return file;

}

}

function processReferencedFiles(file: SourceFile, basePath: string) {

forEach(file.referencedFiles, ref => {

let referencedFileName = isRootedDiskPath(ref.fileName) ? ref.fileName : combinePaths(basePath, ref.fileName);

processSourceFile(normalizePath(referencedFileName), /* isDefaultLib */ false, file, ref.pos, ref.end);

});

}

function processImportedModules(file: SourceFile, basePath: string) {

forEach(file.statements, node => {

if (node.kind === SyntaxKind.ImportDeclaration || node.kind === SyntaxKind.ImportEqualsDeclaration || node.kind === SyntaxKind.ExportDeclaration) {

let moduleNameExpr = getExternalModuleName(node);

if (moduleNameExpr && moduleNameExpr.kind === SyntaxKind.StringLiteral) {

let moduleNameText = (<LiteralExpression>moduleNameExpr).text;

if (moduleNameText) {

let searchPath = basePath;

let searchName: string;

while (true) {

searchName = normalizePath(combinePaths(searchPath, moduleNameText));

if (forEach(supportedExtensions, extension => findModuleSourceFile(searchName + extension, moduleNameExpr))) {

break;

}

let parentPath = getDirectoryPath(searchPath);

if (parentPath === searchPath) {

break;

}

searchPath = parentPath;

}

}

}

}

else if (node.kind === SyntaxKind.ModuleDeclaration && (<ModuleDeclaration>node).name.kind === SyntaxKind.StringLiteral && (node.flags & NodeFlags.Ambient || isDeclarationFile(file))) {

// TypeScript 1.0 spec (April 2014): 12.1.6

// An AmbientExternalModuleDeclaration declares an external module.

// This type of declaration is permitted only in the global module.

// The StringLiteral must specify a top - level external module name.

// Relative external module names are not permitted

forEachChild((<ModuleDeclaration>node).body, node => {

if (isExternalModuleImportEqualsDeclaration(node) &&

getExternalModuleImportEqualsDeclarationExpression(node).kind === SyntaxKind.StringLiteral) {

let nameLiteral = <LiteralExpression>getExternalModuleImportEqualsDeclarationExpression(node);

let moduleName = nameLiteral.text;

if (moduleName) {

// TypeScript 1.0 spec (April 2014): 12.1.6

// An ExternalImportDeclaration in anAmbientExternalModuleDeclaration may reference other external modules

// only through top - level external module names. Relative external module names are not permitted.

let searchName = normalizePath(combinePaths(basePath, moduleName));

forEach(supportedExtensions, extension => findModuleSourceFile(searchName + extension, nameLiteral));

}

}

});

}

});

function findModuleSourceFile(fileName: string, nameLiteral: Expression) {

return findSourceFile(fileName, /* isDefaultLib */ false, file, nameLiteral.pos, nameLiteral.end - nameLiteral.pos);

}

}

function computeCommonSourceDirectory(sourceFiles: SourceFile[]): string {

let commonPathComponents: string[];

let currentDirectory = host.getCurrentDirectory();

forEach(files, sourceFile => {

// Each file contributes into common source file path

if (isDeclarationFile(sourceFile)) {

return;

}

let sourcePathComponents = getNormalizedPathComponents(sourceFile.fileName, currentDirectory);

sourcePathComponents.pop(); // The base file name is not part of the common directory path

if (!commonPathComponents) {

// first file

commonPathComponents = sourcePathComponents;

return;

}

for (let i = 0, n = Math.min(commonPathComponents.length, sourcePathComponents.length); i < n; i++) {

if (commonPathComponents[i] !== sourcePathComponents[i]) {

if (i === 0) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Cannot_find_the_common_subdirectory_path_for_the_input_files));

return;

}

// New common path found that is 0 -> i-1

commonPathComponents.length = i;

break;

}

}

// If the sourcePathComponents was shorter than the commonPathComponents, truncate to the sourcePathComponents

if (sourcePathComponents.length < commonPathComponents.length) {

commonPathComponents.length = sourcePathComponents.length;

}

});

return getNormalizedPathFromPathComponents(commonPathComponents);

}

function checkSourceFilesBelongToPath(sourceFiles: SourceFile[], rootDirectory: string): boolean {

let allFilesBelongToPath = true;

if (sourceFiles) {

let currentDirectory = host.getCurrentDirectory();

let absoluteRootDirectoryPath = host.getCanonicalFileName(getNormalizedAbsolutePath(rootDirectory, currentDirectory));

for (var sourceFile of sourceFiles) {

if (!isDeclarationFile(sourceFile)) {

let absoluteSourceFilePath = host.getCanonicalFileName(getNormalizedAbsolutePath(sourceFile.fileName, currentDirectory));

if (absoluteSourceFilePath.indexOf(absoluteRootDirectoryPath) !== 0) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.File_0_is_not_under_rootDir_1_rootDir_is_expected_to_contain_all_source_files, sourceFile.fileName, options.rootDir));

allFilesBelongToPath = false;

}

}

}

}

return allFilesBelongToPath;

}

function verifyCompilerOptions() {

if (options.isolatedModules) {

if (options.sourceMap) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_sourceMap_cannot_be_specified_with_option_isolatedModules));

}

if (options.declaration) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_declaration_cannot_be_specified_with_option_isolatedModules));

}

if (options.noEmitOnError) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_noEmitOnError_cannot_be_specified_with_option_isolatedModules));

}

if (options.out) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_out_cannot_be_specified_with_option_isolatedModules));

}

}

if (options.inlineSourceMap) {

if (options.sourceMap) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_sourceMap_cannot_be_specified_with_option_inlineSourceMap));

}

if (options.mapRoot) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_mapRoot_cannot_be_specified_with_option_inlineSourceMap));

}

if (options.sourceRoot) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_sourceRoot_cannot_be_specified_with_option_inlineSourceMap));

}

}

if (options.inlineSources) {

if (!options.sourceMap && !options.inlineSourceMap) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_inlineSources_can_only_be_used_when_either_option_inlineSourceMap_or_option_sourceMap_is_provided));

}

}

if (!options.sourceMap && (options.mapRoot || options.sourceRoot)) {

// Error to specify --mapRoot or --sourceRoot without mapSourceFiles

if (options.mapRoot) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_mapRoot_cannot_be_specified_without_specifying_sourceMap_option));

}

if (options.sourceRoot) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_sourceRoot_cannot_be_specified_without_specifying_sourceMap_option));

}

return;

}

let languageVersion = options.target || ScriptTarget.ES3;

let firstExternalModuleSourceFile = forEach(files, f => isExternalModule(f) ? f : undefined);

if (options.isolatedModules) {

if (!options.module && languageVersion < ScriptTarget.ES6) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_isolatedModules_can_only_be_used_when_either_option_module_is_provided_or_option_target_is_ES6_or_higher));

}

let firstNonExternalModuleSourceFile = forEach(files, f => !isExternalModule(f) && !isDeclarationFile(f) ? f : undefined);

if (firstNonExternalModuleSourceFile) {

let span = getErrorSpanForNode(firstNonExternalModuleSourceFile, firstNonExternalModuleSourceFile);

diagnostics.add(createFileDiagnostic(firstNonExternalModuleSourceFile, span.start, span.length, Diagnostics.Cannot_compile_namespaces_when_the_isolatedModules_flag_is_provided));

}

}

else if (firstExternalModuleSourceFile && languageVersion < ScriptTarget.ES6 && !options.module) {

// We cannot use createDiagnosticFromNode because nodes do not have parents yet

let span = getErrorSpanForNode(firstExternalModuleSourceFile, firstExternalModuleSourceFile.externalModuleIndicator);

diagnostics.add(createFileDiagnostic(firstExternalModuleSourceFile, span.start, span.length, Diagnostics.Cannot_compile_modules_unless_the_module_flag_is_provided));

}

// Cannot specify module gen target when in es6 or above

if (options.module && languageVersion >= ScriptTarget.ES6) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Cannot_compile_modules_into_commonjs_amd_system_or_umd_when_targeting_ES6_or_higher));

}

// there has to be common source directory if user specified --outdir || --sourceRoot

// if user specified --mapRoot, there needs to be common source directory if there would be multiple files being emitted

if (options.outDir || // there is --outDir specified

options.sourceRoot || // there is --sourceRoot specified

(options.mapRoot && // there is --mapRoot specified and there would be multiple js files generated

(!options.out || firstExternalModuleSourceFile !== undefined))) {

if (options.rootDir && checkSourceFilesBelongToPath(files, options.rootDir)) {

// If a rootDir is specified and is valid use it as the commonSourceDirectory

commonSourceDirectory = getNormalizedAbsolutePath(options.rootDir, host.getCurrentDirectory());

}

else {

// Compute the commonSourceDirectory from the input files

commonSourceDirectory = computeCommonSourceDirectory(files);

}

if (commonSourceDirectory && commonSourceDirectory[commonSourceDirectory.length - 1] !== directorySeparator) {

// Make sure directory path ends with directory separator so this string can directly

// used to replace with "" to get the relative path of the source file and the relative path doesn't

// start with / making it rooted path

commonSourceDirectory += directorySeparator;

}

}

if (options.noEmit) {

if (options.out || options.outDir) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_noEmit_cannot_be_specified_with_option_out_or_outDir));

}

if (options.declaration) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_noEmit_cannot_be_specified_with_option_declaration));

}

}

if (options.emitDecoratorMetadata &&

!options.experimentalDecorators) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_experimentalDecorators_must_also_be_specified_when_option_emitDecoratorMetadata_is_specified));

}

if (options.experimentalAsyncFunctions &&

options.target !== ScriptTarget.ES6) {

diagnostics.add(createCompilerDiagnostic(Diagnostics.Option_experimentalAsyncFunctions_cannot_be_specified_when_targeting_ES5_or_lower));

}

}