let count = 0;

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

count += getLineStarts(file).length;

});

return count;

sys: System,

existing: DiagnosticReporter,

options: CompilerOptions | BuildOptions

): DiagnosticReporter {

return shouldBePretty(sys, options) ?

createDiagnosticReporter(sys, /*pretty*/ true) :

existing;

if (!options || typeof options.pretty === "undefined") {

return defaultIsPretty(sys);

}

return options.pretty;

while (s.length < length) {

s = " " + s;

}

return s;

while (s.length < length) {

s = s + " ";

}

return s;

// Sort our options by their names, (e.g. "--noImplicitAny" comes before "--watch")

return !!commandLine.options.all ?

sort(optionDeclarations, (a, b) => compareStringsCaseInsensitive(a.name, b.name)) :

filter(optionDeclarations.slice(), v => !!v.showInSimplifiedHelpView);

const output: string[] = [];

// We want to align our "syntax" and "examples" commands to a certain margin.

const syntaxLength = getDiagnosticText(Diagnostics.Syntax_Colon_0, "").length;

const examplesLength = getDiagnosticText(Diagnostics.Examples_Colon_0, "").length;

let marginLength = Math.max(syntaxLength, examplesLength);

// Build up the syntactic skeleton.

let syntax = makePadding(marginLength - syntaxLength);

syntax += `tsc ${syntaxPrefix}[${getDiagnosticText(Diagnostics.options)}] [${getDiagnosticText(Diagnostics.file)}...]`;

output.push(getDiagnosticText(Diagnostics.Syntax_Colon_0, syntax));

output.push(sys.newLine + sys.newLine);

// Build up the list of examples.

const padding = makePadding(marginLength);

output.push(getDiagnosticText(Diagnostics.Examples_Colon_0, makePadding(marginLength - examplesLength) + "tsc hello.ts") + sys.newLine);

output.push(padding + "tsc --outFile file.js file.ts" + sys.newLine);

output.push(padding + "tsc @args.txt" + sys.newLine);

output.push(padding + "tsc --build tsconfig.json" + sys.newLine);

output.push(sys.newLine);

output.push(getDiagnosticText(Diagnostics.Options_Colon) + sys.newLine);

// We want our descriptions to align at the same column in our output,

// so we keep track of the longest option usage string.

marginLength = 0;

const usageColumn: string[] = []; // Things like "-d, --declaration" go in here.

const descriptionColumn: string[] = [];

const optionsDescriptionMap = createMap<string[]>(); // Map between option.description and list of option.type if it is a kind

for (const option of optionsList) {

// If an option lacks a description,

// it is not officially supported.

if (!option.description) {

continue;

}

let usageText = " ";

if (option.shortName) {

usageText += "-" + option.shortName;

usageText += getParamType(option);

usageText += ", ";

}

usageText += "--" + option.name;

usageText += getParamType(option);

usageColumn.push(usageText);

let description: string;

if (option.name === "lib") {

description = getDiagnosticText(option.description);

const element = (<CommandLineOptionOfListType>option).element;

const typeMap = <Map<number | string>>element.type;

optionsDescriptionMap.set(description, arrayFrom(typeMap.keys()).map(key => `'${key}'`));

}

else {

description = getDiagnosticText(option.description);

}

descriptionColumn.push(description);

// Set the new margin for the description column if necessary.

marginLength = Math.max(usageText.length, marginLength);

}

// Special case that can't fit in the loop.

const usageText = " @<" + getDiagnosticText(Diagnostics.file) + ">";

usageColumn.push(usageText);

descriptionColumn.push(getDiagnosticText(Diagnostics.Insert_command_line_options_and_files_from_a_file));

marginLength = Math.max(usageText.length, marginLength);

// Print out each row, aligning all the descriptions on the same column.

for (let i = 0; i < usageColumn.length; i++) {

const usage = usageColumn[i];

const description = descriptionColumn[i];

const kindsList = optionsDescriptionMap.get(description);

output.push(usage + makePadding(marginLength - usage.length + 2) + description + sys.newLine);

if (kindsList) {

output.push(makePadding(marginLength + 4));

for (const kind of kindsList) {

output.push(kind + " ");

}

output.push(sys.newLine);

}

}

for (const line of output) {

sys.write(line);

}

return;

function getParamType(option: CommandLineOption) {

if (option.paramType !== undefined) {

return " " + getDiagnosticText(option.paramType);

}

return "";

}

function makePadding(paddingLength: number): string {

return Array(paddingLength + 1).join(" ");

}

sys: System,

cb: ExecuteCommandLineCallbacks,

commandLine: ParsedCommandLine,

maxNumberOfFilesToIterateForInvalidation: number | undefined

) {

let reportDiagnostic = createDiagnosticReporter(sys);

if (commandLine.options.build) {

reportDiagnostic(createCompilerDiagnostic(Diagnostics.Option_build_must_be_the_first_command_line_argument));

return sys.exit(ExitStatus.DiagnosticsPresent_OutputsSkipped);

}

// Configuration file name (if any)

let configFileName: string | undefined;

if (commandLine.options.locale) {

validateLocaleAndSetLanguage(commandLine.options.locale, sys, commandLine.errors);

}

// If there are any errors due to command line parsing and/or

// setting up localization, report them and quit.

if (commandLine.errors.length > 0) {

commandLine.errors.forEach(reportDiagnostic);

return sys.exit(ExitStatus.DiagnosticsPresent_OutputsSkipped);

}

if (commandLine.options.init) {

writeConfigFile(sys, reportDiagnostic, commandLine.options, commandLine.fileNames);

return sys.exit(ExitStatus.Success);

}

if (commandLine.options.version) {

printVersion(sys);

return sys.exit(ExitStatus.Success);

}

if (commandLine.options.help || commandLine.options.all) {

printVersion(sys);

printHelp(sys, getOptionsForHelp(commandLine));

return sys.exit(ExitStatus.Success);

}

if (commandLine.options.watch && commandLine.options.listFilesOnly) {

reportDiagnostic(createCompilerDiagnostic(Diagnostics.Options_0_and_1_cannot_be_combined, "watch", "listFilesOnly"));

return sys.exit(ExitStatus.DiagnosticsPresent_OutputsSkipped);

}

if (commandLine.options.project) {

if (commandLine.fileNames.length !== 0) {

reportDiagnostic(createCompilerDiagnostic(Diagnostics.Option_project_cannot_be_mixed_with_source_files_on_a_command_line));

return sys.exit(ExitStatus.DiagnosticsPresent_OutputsSkipped);

}

const fileOrDirectory = normalizePath(commandLine.options.project);

if (!fileOrDirectory /* current directory "." */ || sys.directoryExists(fileOrDirectory)) {

configFileName = combinePaths(fileOrDirectory, "tsconfig.json");

if (!sys.fileExists(configFileName)) {

reportDiagnostic(createCompilerDiagnostic(Diagnostics.Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0, commandLine.options.project));

return sys.exit(ExitStatus.DiagnosticsPresent_OutputsSkipped);

}

}

else {

configFileName = fileOrDirectory;

if (!sys.fileExists(configFileName)) {

reportDiagnostic(createCompilerDiagnostic(Diagnostics.The_specified_path_does_not_exist_Colon_0, commandLine.options.project));

return sys.exit(ExitStatus.DiagnosticsPresent_OutputsSkipped);

}

}

}

else if (commandLine.fileNames.length === 0) {

const searchPath = normalizePath(sys.getCurrentDirectory());

configFileName = findConfigFile(searchPath, fileName => sys.fileExists(fileName));

}

if (commandLine.fileNames.length === 0 && !configFileName) {

if (commandLine.options.showConfig) {

reportDiagnostic(createCompilerDiagnostic(Diagnostics.Cannot_find_a_tsconfig_json_file_at_the_current_directory_Colon_0, normalizePath(sys.getCurrentDirectory())));

return sys.exit(ExitStatus.DiagnosticsPresent_OutputsSkipped);

}

else {

printVersion(sys);

printHelp(sys, getOptionsForHelp(commandLine));

return sys.exit(ExitStatus.Success);

}

}

const currentDirectory = sys.getCurrentDirectory();

const commandLineOptions = convertToOptionsWithAbsolutePaths(

commandLine.options,

fileName => getNormalizedAbsolutePath(fileName, currentDirectory)

);

if (configFileName) {

const configParseResult = parseConfigFileWithSystem(configFileName, commandLineOptions, commandLine.watchOptions, sys, reportDiagnostic)!; // TODO: GH#18217

if (commandLineOptions.showConfig) {

if (configParseResult.errors.length !== 0) {

reportDiagnostic = updateReportDiagnostic(

sys,

reportDiagnostic,

configParseResult.options

);

configParseResult.errors.forEach(reportDiagnostic);

return sys.exit(ExitStatus.DiagnosticsPresent_OutputsSkipped);

}

// eslint-disable-next-line no-null/no-null

sys.write(JSON.stringify(convertToTSConfig(configParseResult, configFileName, sys), null, 4) + sys.newLine);

return sys.exit(ExitStatus.Success);

}

reportDiagnostic = updateReportDiagnostic(

sys,

reportDiagnostic,

configParseResult.options

);

if (isWatchSet(configParseResult.options)) {

if (reportWatchModeWithoutSysSupport(sys, reportDiagnostic)) return;

return createWatchOfConfigFile(

sys,

cb,

reportDiagnostic,

configParseResult,

commandLineOptions,

commandLine.watchOptions,

maxNumberOfFilesToIterateForInvalidation

);

}

else if (isIncrementalCompilation(configParseResult.options)) {

performIncrementalCompilation(

sys,

cb,

reportDiagnostic,

configParseResult

);

}

else {

performCompilation(

sys,

cb,

reportDiagnostic,

configParseResult

);

}

}

else {

if (commandLineOptions.showConfig) {

// eslint-disable-next-line no-null/no-null

sys.write(JSON.stringify(convertToTSConfig(commandLine, combinePaths(currentDirectory, "tsconfig.json"), sys), null, 4) + sys.newLine);

return sys.exit(ExitStatus.Success);

}

reportDiagnostic = updateReportDiagnostic(

sys,

reportDiagnostic,

commandLineOptions

);

if (isWatchSet(commandLineOptions)) {

if (reportWatchModeWithoutSysSupport(sys, reportDiagnostic)) return;

return createWatchOfFilesAndCompilerOptions(

sys,

cb,

reportDiagnostic,

commandLine.fileNames,

commandLineOptions,

commandLine.watchOptions,

maxNumberOfFilesToIterateForInvalidation

);

}

else if (isIncrementalCompilation(commandLineOptions)) {

performIncrementalCompilation(

sys,

cb,

reportDiagnostic,

{ ...commandLine, options: commandLineOptions }

);

}

else {

performCompilation(

sys,

cb,

reportDiagnostic,

{ ...commandLine, options: commandLineOptions }

);

}

}

if (commandLineArgs.length > 0 && commandLineArgs[0].charCodeAt(0) === CharacterCodes.minus) {

const firstOption = commandLineArgs[0].slice(commandLineArgs[0].charCodeAt(1) === CharacterCodes.minus ? 2 : 1).toLowerCase();

return firstOption === "build" || firstOption === "b";

}

return false;

system: System,

cb: ExecuteCommandLineCallbacks,

commandLineArgs: readonly string[],

maxNumberOfFilesToIterateForInvalidation?: number

) {

if (isBuild(commandLineArgs)) {

const { buildOptions, watchOptions, projects, errors } = parseBuildCommand(commandLineArgs.slice(1));

if (buildOptions.generateCpuProfile && system.enableCPUProfiler) {

system.enableCPUProfiler(buildOptions.generateCpuProfile, () => performBuild(

system,

cb,

buildOptions,

watchOptions,

projects,

errors

));

}

else {

return performBuild(

system,

cb,

buildOptions,

watchOptions,

projects,

errors

);

}

}

const commandLine = parseCommandLine(commandLineArgs, path => system.readFile(path));

if (commandLine.options.generateCpuProfile && system.enableCPUProfiler) {

system.enableCPUProfiler(commandLine.options.generateCpuProfile, () => executeCommandLineWorker(

system,

cb,

commandLine,

maxNumberOfFilesToIterateForInvalidation

));

}

else {

return executeCommandLineWorker(system, cb, commandLine, maxNumberOfFilesToIterateForInvalidation);

}

if (!sys.watchFile || !sys.watchDirectory) {

reportDiagnostic(createCompilerDiagnostic(Diagnostics.The_current_host_does_not_support_the_0_option, "--watch"));

sys.exit(ExitStatus.DiagnosticsPresent_OutputsSkipped);

return true;

}

return false;

sys: System,

cb: ExecuteCommandLineCallbacks,

buildOptions: BuildOptions,

watchOptions: WatchOptions | undefined,

projects: string[],

errors: Diagnostic[]

) {

// Update to pretty if host supports it

const reportDiagnostic = updateReportDiagnostic(

sys,

createDiagnosticReporter(sys),

buildOptions

);

if (buildOptions.locale) {

validateLocaleAndSetLanguage(buildOptions.locale, sys, errors);

}

if (errors.length > 0) {

errors.forEach(reportDiagnostic);

return sys.exit(ExitStatus.DiagnosticsPresent_OutputsSkipped);

}

if (buildOptions.help) {

printVersion(sys);

printHelp(sys, buildOpts, "--build ");

return sys.exit(ExitStatus.Success);

}

if (projects.length === 0) {

printVersion(sys);

printHelp(sys, buildOpts, "--build ");

return sys.exit(ExitStatus.Success);

}

if (!sys.getModifiedTime || !sys.setModifiedTime || (buildOptions.clean && !sys.deleteFile)) {

reportDiagnostic(createCompilerDiagnostic(Diagnostics.The_current_host_does_not_support_the_0_option, "--build"));

return sys.exit(ExitStatus.DiagnosticsPresent_OutputsSkipped);

}

if (buildOptions.watch) {

if (reportWatchModeWithoutSysSupport(sys, reportDiagnostic)) return;

const buildHost = createSolutionBuilderWithWatchHost(

sys,

/*createProgram*/ undefined,

reportDiagnostic,

createBuilderStatusReporter(sys, shouldBePretty(sys, buildOptions)),

createWatchStatusReporter(sys, buildOptions)

);

updateSolutionBuilderHost(sys, cb, buildHost);

const builder = createSolutionBuilderWithWatch(buildHost, projects, buildOptions, watchOptions);

builder.build();

return builder;

}

const buildHost = createSolutionBuilderHost(

sys,

/*createProgram*/ undefined,

reportDiagnostic,

createBuilderStatusReporter(sys, shouldBePretty(sys, buildOptions)),

createReportErrorSummary(sys, buildOptions)

);

updateSolutionBuilderHost(sys, cb, buildHost);

const builder = createSolutionBuilder(buildHost, projects, buildOptions);

const exitStatus = buildOptions.clean ? builder.clean() : builder.build();

return sys.exit(exitStatus);

return shouldBePretty(sys, options) ?

errorCount => sys.write(getErrorSummaryText(errorCount, sys.newLine)) :

undefined;

sys: System,

cb: ExecuteCommandLineCallbacks,

reportDiagnostic: DiagnosticReporter,

config: ParsedCommandLine

) {

const { fileNames, options, projectReferences } = config;

const host = createCompilerHostWorker(options, /*setParentPos*/ undefined, sys);

const currentDirectory = host.getCurrentDirectory();

const getCanonicalFileName = createGetCanonicalFileName(host.useCaseSensitiveFileNames());

changeCompilerHostLikeToUseCache(host, fileName => toPath(fileName, currentDirectory, getCanonicalFileName));

enableStatistics(sys, options);

const programOptions: CreateProgramOptions = {

rootNames: fileNames,

options,

projectReferences,

host,

configFileParsingDiagnostics: getConfigFileParsingDiagnostics(config)

};

const program = createProgram(programOptions);

const exitStatus = emitFilesAndReportErrorsAndGetExitStatus(

program,

reportDiagnostic,

s => sys.write(s + sys.newLine),

createReportErrorSummary(sys, options)

);

reportStatistics(sys, program);

cb(program);

return sys.exit(exitStatus);

sys: System,

cb: ExecuteCommandLineCallbacks,

reportDiagnostic: DiagnosticReporter,

config: ParsedCommandLine

) {

const { options, fileNames, projectReferences } = config;

enableStatistics(sys, options);

const host = createIncrementalCompilerHost(options, sys);

const exitStatus = ts.performIncrementalCompilation({

host,

system: sys,

rootNames: fileNames,

options,

configFileParsingDiagnostics: getConfigFileParsingDiagnostics(config),

projectReferences,

reportDiagnostic,

reportErrorSummary: createReportErrorSummary(sys, options),

afterProgramEmitAndDiagnostics: builderProgram => {

reportStatistics(sys, builderProgram.getProgram());

cb(builderProgram);

}

});

return sys.exit(exitStatus);

sys: System,

cb: ExecuteCommandLineCallbacks,

buildHost: SolutionBuilderHostBase<EmitAndSemanticDiagnosticsBuilderProgram>

) {

updateCreateProgram(sys, buildHost);

buildHost.afterProgramEmitAndDiagnostics = program => {

reportStatistics(sys, program.getProgram());

cb(program);

};

buildHost.afterEmitBundle = cb;

const compileUsingBuilder = host.createProgram;

host.createProgram = (rootNames, options, host, oldProgram, configFileParsingDiagnostics, projectReferences) => {

Debug.assert(rootNames !== undefined || (options === undefined && !!oldProgram));

if (options !== undefined) {

enableStatistics(sys, options);

}

return compileUsingBuilder(rootNames, options, host, oldProgram, configFileParsingDiagnostics, projectReferences);

};

sys: System,

cb: ExecuteCommandLineCallbacks,

watchCompilerHost: WatchCompilerHost<EmitAndSemanticDiagnosticsBuilderProgram>,

maxNumberOfFilesToIterateForInvalidation: number | undefined

) {

updateCreateProgram(sys, watchCompilerHost);

watchCompilerHost.maxNumberOfFilesToIterateForInvalidation = maxNumberOfFilesToIterateForInvalidation;

const emitFilesUsingBuilder = watchCompilerHost.afterProgramCreate!; // TODO: GH#18217

watchCompilerHost.afterProgramCreate = builderProgram => {

emitFilesUsingBuilder(builderProgram);

reportStatistics(sys, builderProgram.getProgram());

cb(builderProgram);

};

sys: System,

cb: ExecuteCommandLineCallbacks,

reportDiagnostic: DiagnosticReporter,

configParseResult: ParsedCommandLine,

optionsToExtend: CompilerOptions,

watchOptionsToExtend: WatchOptions | undefined,

maxNumberOfFilesToIterateForInvalidation: number | undefined

) {

const watchCompilerHost = createWatchCompilerHostOfConfigFile(

configParseResult.options.configFilePath!,

optionsToExtend,

watchOptionsToExtend,

sys,

/*createProgram*/ undefined,

reportDiagnostic,

createWatchStatusReporter(sys, configParseResult.options)

); // TODO: GH#18217

updateWatchCompilationHost(sys, cb, watchCompilerHost, maxNumberOfFilesToIterateForInvalidation);

watchCompilerHost.configFileParsingResult = configParseResult;

return createWatchProgram(watchCompilerHost);

sys: System,

cb: ExecuteCommandLineCallbacks,

reportDiagnostic: DiagnosticReporter,

rootFiles: string[],

options: CompilerOptions,

watchOptions: WatchOptions | undefined,

maxNumberOfFilesToIterateForInvalidation: number | undefined

) {

const watchCompilerHost = createWatchCompilerHostOfFilesAndCompilerOptions(

rootFiles,

options,

watchOptions,

sys,

/*createProgram*/ undefined,

reportDiagnostic,

createWatchStatusReporter(sys, options)

);

updateWatchCompilationHost(sys, cb, watchCompilerHost, maxNumberOfFilesToIterateForInvalidation);

return createWatchProgram(watchCompilerHost);

if (canReportDiagnostics(sys, compilerOptions)) {

performance.enable();

}

let statistics: Statistic[];

const compilerOptions = program.getCompilerOptions();

if (canReportDiagnostics(sys, compilerOptions)) {

statistics = [];

const memoryUsed = sys.getMemoryUsage ? sys.getMemoryUsage() : -1;

reportCountStatistic("Files", program.getSourceFiles().length);

reportCountStatistic("Lines", countLines(program));

reportCountStatistic("Nodes", program.getNodeCount());

reportCountStatistic("Identifiers", program.getIdentifierCount());

reportCountStatistic("Symbols", program.getSymbolCount());

reportCountStatistic("Types", program.getTypeCount());

if (memoryUsed >= 0) {

reportStatisticalValue("Memory used", Math.round(memoryUsed / 1000) + "K");

}

const programTime = performance.getDuration("Program");

const bindTime = performance.getDuration("Bind");

const checkTime = performance.getDuration("Check");

const emitTime = performance.getDuration("Emit");

if (compilerOptions.extendedDiagnostics) {

const caches = program.getRelationCacheSizes();

reportCountStatistic("Assignability cache size", caches.assignable);

reportCountStatistic("Identity cache size", caches.identity);

reportCountStatistic("Subtype cache size", caches.subtype);

reportCountStatistic("Strict subtype cache size", caches.strictSubtype);

performance.forEachMeasure((name, duration) => reportTimeStatistic(`${name} time`, duration));

}

else {

// Individual component times.

// Note: To match the behavior of previous versions of the compiler, the reported parse time includes

// I/O read time and processing time for triple-slash references and module imports, and the reported

// emit time includes I/O write time. We preserve this behavior so we can accurately compare times.

reportTimeStatistic("I/O read", performance.getDuration("I/O Read"));

reportTimeStatistic("I/O write", performance.getDuration("I/O Write"));

reportTimeStatistic("Parse time", programTime);

reportTimeStatistic("Bind time", bindTime);

reportTimeStatistic("Check time", checkTime);

reportTimeStatistic("Emit time", emitTime);

}

reportTimeStatistic("Total time", programTime + bindTime + checkTime + emitTime);

reportStatistics();

performance.disable();

}

function reportStatistics() {

let nameSize = 0;

let valueSize = 0;

for (const { name, value } of statistics) {

if (name.length > nameSize) {

nameSize = name.length;

}

if (value.length > valueSize) {

valueSize = value.length;

}

}

for (const { name, value } of statistics) {

sys.write(padRight(name + ":", nameSize + 2) + padLeft(value.toString(), valueSize) + sys.newLine);

}

}

function reportStatisticalValue(name: string, value: string) {

statistics.push({ name, value });

}

function reportCountStatistic(name: string, count: number) {

reportStatisticalValue(name, "" + count);

}

function reportTimeStatistic(name: string, time: number) {

reportStatisticalValue(name, (time / 1000).toFixed(2) + "s");

}

sys: System,

reportDiagnostic: DiagnosticReporter,

options: CompilerOptions,

fileNames: string[]

) {

const currentDirectory = sys.getCurrentDirectory();

const file = normalizePath(combinePaths(currentDirectory, "tsconfig.json"));

if (sys.fileExists(file)) {

reportDiagnostic(createCompilerDiagnostic(Diagnostics.A_tsconfig_json_file_is_already_defined_at_Colon_0, file));

}

else {

sys.writeFile(file, generateTSConfig(options, fileNames, sys.newLine));

reportDiagnostic(createCompilerDiagnostic(Diagnostics.Successfully_created_a_tsconfig_json_file));

}

return;