feat(config): add isCLI helper function (#60)

Author: johnsoncodehk

packages/cli/index.ts

@@ -8,6 +8,8 @@ import fs = require('fs');
 import os = require('os');
 import languagePlugins = require('./lib/languagePlugins.js');
 
+process.env.TSSLINT_CLI = '1';
+
 const _reset = '\x1b[0m';
 const purple = (s: string) => '\x1b[35m' + s + _reset;
 const cyan = (s: string) => '\x1b[36m' + s + _reset;

packages/config/index.ts

@@ -14,3 +14,7 @@ export function definePlugin(plugin: Plugin) {
 export function defineConfig(config: Config | Config[]) {
 	return config;
 }
+
+export function isCLI() {
+	return !!process.env.TSSLINT_CLI;
+}