typings: add shim typing for checkenv

src/server.ts

@@ -8,7 +8,6 @@ import modules from './commands/_';
 import triggers from './triggers/_';
 
 // Check for environmental variables.
-// eslint-disable-next-line
 import * as checkenv from 'checkenv';
 checkenv.setConfig(require('../env.json'));
 checkenv.check();

tsconfig.json

@@ -11,7 +11,11 @@
         "lib": [
             "es2018",
             "dom"
-        ]
+        ],
+        "typeRoots": [
+            "./typings",
+            "./node_modules/@types/"
+        ],
     },
     "include": [
         "src/**/*"

typings/checkenv/index.d.ts

@@ -0,0 +1,5 @@
+declare module 'checkenv';
+
+export function load(): string;
+export function check(): void;
+export function setConfig(config: any): void;