Make sure TSLint picks up the correct version of TypeScript

Fixes #24

**Bug**
TSLint does `require('typescript')` to import typescript instead of taking typescript as value at runtime. Due to how node's module resolution works, this can cause TSLint to import a different typescript version than the version being used by the TS Server

This version mismatch can cause weird behavior as the ast and apis may not be compatible

**Fix**
Mock out `require('typescript')` to make sure we always return the typescript version from the server

package.json

@@ -18,12 +18,14 @@
   },
   "dependencies": {
     "minimatch": "^3.0.4",
+    "mock-require": "^3.0.2",
     "vscode-languageserver": "^5.1.0"
   },
   "devDependencies": {
     "@types/chai": "^4.1.6",
     "@types/minimatch": "^3.0.3",
     "@types/mocha": "^5.2.5",
+    "@types/mock-require": "^2.0.0",
     "@types/node": "^7.0.8",
     "chai": "^4.2.0",
     "mocha": "^5.2.0",

src/index.ts

@@ -2,10 +2,15 @@ import { TSLintPlugin } from './plugin';
 import * as ts_module from 'typescript/lib/tsserverlibrary';
 import { Logger } from './logger';
 import { ConfigurationManager } from './settings';
+import * as mockRequire from 'mock-require';
 
 export = function init({ typescript }: { typescript: typeof ts_module }) {
     const configManager = new ConfigurationManager(typescript);
     let logger: Logger | undefined;
+
+    // Make sure TS Lint imports the correct version of TS
+    mockRequire('typescript', typescript);
+
     return {
         create(info: ts.server.PluginCreateInfo) {
             logger = Logger.forPlugin(info);