// @module: commonjs

// @includebuiltfile: typescript_standalone.d.ts

// @noImplicitAny:true

// @strictNullChecks:true

/*

* Note: This test is a public API sample. The sample sources can be found

at: https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#incremental-build-support-using-the-language-services

* Please log a "breaking change" issue for any API breaking change affecting this issue

*/

declare var process: any;

declare var console: any;

declare var fs: {

existsSync(path: string): boolean;

readdirSync(path: string): string[];

readFileSync(filename: string, encoding?: string): string;

writeFileSync(filename: string, data: any, options?: { encoding?: string; mode?: number; flag?: string; } | string): void;

watchFile(filename: string, options: { persistent?: boolean; interval?: number; }, listener: (curr: { mtime: Date }, prev: { mtime: Date }) => void): void;

};

declare var path: any;

import * as ts from "typescript";

function watch(rootFileNames: string[], options: ts.CompilerOptions) {

const files: ts.MapLike<{ version: number }> = {};

// initialize the list of files

rootFileNames.forEach(fileName => {

files[fileName] = { version: 0 };

});

// Create the language service host to allow the LS to communicate with the host

const servicesHost: ts.LanguageServiceHost = {

getScriptFileNames: () => rootFileNames,

getScriptVersion: (fileName) => files[fileName] && files[fileName].version.toString(),

getScriptSnapshot: (fileName) => {

if (!fs.existsSync(fileName)) {

return undefined;

}

return ts.ScriptSnapshot.fromString(fs.readFileSync(fileName).toString());

},

getCurrentDirectory: () => process.cwd(),

getCompilationSettings: () => options,

getDefaultLibFileName: (options) => ts.getDefaultLibFilePath(options),

};

// Create the language service files

const services = ts.createLanguageService(servicesHost, ts.createDocumentRegistry())

// Now let's watch the files

rootFileNames.forEach(fileName => {

// First time around, emit all files

emitFile(fileName);

// Add a watch on the file to handle next change

fs.watchFile(fileName,

{ persistent: true, interval: 250 },

(curr, prev) => {

// Check timestamp

if (+curr.mtime <= +prev.mtime) {

return;

}

// Update the version to signal a change in the file

files[fileName].version++;

// write the changes to disk

emitFile(fileName);

});

});

function emitFile(fileName: string) {

let output = services.getEmitOutput(fileName);

if (!output.emitSkipped) {

console.log(`Emitting ${fileName}`);

}

else {

console.log(`Emitting ${fileName} failed`);

logErrors(fileName);

}

output.outputFiles.forEach(o => {

fs.writeFileSync(o.name, o.text, "utf8");

});

}

function logErrors(fileName: string) {

let allDiagnostics = services.getCompilerOptionsDiagnostics()

.concat(services.getSyntacticDiagnostics(fileName))

.concat(services.getSemanticDiagnostics(fileName));

allDiagnostics.forEach(diagnostic => {

let message = ts.flattenDiagnosticMessageText(diagnostic.messageText, "\n");

if (diagnostic.file) {

let { line, character } = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start!);

console.log(` Error ${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message}`);

}

else {

console.log(` Error: ${message}`);

}

});

}

}

// Initialize files constituting the program as all .ts files in the current directory

const currentDirectoryFiles = fs.readdirSync(process.cwd()).

filter(fileName=> fileName.length >= 3 && fileName.substr(fileName.length - 3, 3) === ".ts");

// Start the watcher

watch(currentDirectoryFiles, { module: ts.ModuleKind.CommonJS });