tsconfig: TypeScript version

closes #126
refs microsoft/TypeScript#2133

Author: basarat

docs/tsconfig.md

@@ -4,6 +4,7 @@ A unified project format for TypeScript ([see merged PR on Microsoft/TypeScript]
 * [`compilerOptions`](https://github.com/TypeStrong/atom-typescript/blob/e2fa67c4715189b71430f766ed9a92d9fb3255f9/lib/main/tsconfig/tsconfig.ts#L8-L33) similar to what you would pass on the commandline to `tsc`.
 * [`filesGlob`](https://github.com/TypeStrong/atom-typescript/blob/master/docs/tsconfig.md#filesglob): To make it easier for you to just add / remove files in your project we add `filesGlob` which accepts an array of `glob / minimatch / RegExp` patterns (similar to grunt) to specify source files.
 * [`format`](https://github.com/TypeStrong/atom-typescript/blob/master/docs/tsconfig.md#format) : Code formatting options
+* [`version`](https://github.com/TypeStrong/atom-typescript/blob/master/docs/tsconfig.md#version): The TypeScript version
 
 
 ## Examples
@@ -57,3 +58,6 @@ We pass these to the TypeScript language service as code formatting options.
     }
 }
 ```
+
+### version
+This exists simply to make it easier for the future you to know which TypeScript version was used when this project file was created. You can read more here [Microsoft/TypeScript#2113](https://github.com/Microsoft/TypeScript/issues/2133)

lib/main/tsconfig/tsconfig.js

@@ -18,6 +18,7 @@ var ts = require('typescript');
 var formatting = require('./formatting');
 var projectFileName = 'tsconfig.json';
 var defaultFilesGlob = ["./**/*.ts", "!./node_modules/**/*.ts"];
+var typeScriptVersion = '1.4.1';
 exports.defaults = {
     target: ts.ScriptTarget.ES5,
     module: ts.ModuleKind.CommonJS,
@@ -191,6 +192,7 @@ function createProjectRootSync(srcFile, defaultOptions) {
     if (fs.existsSync(projectFilePath))
         throw new Error(exports.errors.CREATE_PROJECT_ALREADY_EXISTS);
     var projectSpec = {};
+    projectSpec.version = typeScriptVersion;
     projectSpec.compilerOptions = tsToRawCompilerOptions(defaultOptions || exports.defaults);
     projectSpec.filesGlob = defaultFilesGlob;
     fs.writeFileSync(projectFilePath, prettyJSON(projectSpec));

lib/main/tsconfig/tsconfig.ts

@@ -35,6 +35,7 @@ interface CompilerOptions {
 }
 
 interface TypeScriptProjectRawSpecification {
+    version?: string;
     compilerOptions?: CompilerOptions;
     files?: string[];                                   // optional: paths to files
     filesGlob?: string[];                               // optional: An array of 'glob / minimatch / RegExp' patterns to specify source files
@@ -82,8 +83,8 @@ import os = require('os');
 import formatting = require('./formatting');
 
 var projectFileName = 'tsconfig.json';
-
 var defaultFilesGlob = ["./**/*.ts", "!./node_modules/**/*.ts"];
+var typeScriptVersion = '1.4.1';
 
 export var defaults: ts.CompilerOptions = {
     target: ts.ScriptTarget.ES5,
@@ -310,6 +311,7 @@ export function createProjectRootSync(srcFile: string, defaultOptions?: ts.Compi
 
     // We need to write the raw spec
     var projectSpec: TypeScriptProjectRawSpecification = {};
+    projectSpec.version = typeScriptVersion;
     projectSpec.compilerOptions = tsToRawCompilerOptions(defaultOptions || defaults);
     projectSpec.filesGlob = defaultFilesGlob;