fix(tslint) enable type-checking

package.json

@@ -27,7 +27,7 @@
     "lint": "npm run check-node-version && npm run eslint && npm run tslint",
     "nycava": "WECHATY_HEAD=chrome nyc ava --serial --fail-fast --verbose --timeout=3m \"dist/{src,test}/**/*.spec.js\"",
     "eslint": "eslint \"{bin,example,src,test}/**/*.js\" --ignore-pattern=\"test/fixture/**\"",
-    "tslint": "tslint \"{bin,example,src,test}/**/*.ts\" --exclude=\"test/fixture/**\" --exclude=\"dist/\" && npm run clean && tsc --noEmit",
+    "tslint": "tslint --project tsconfig.json --type-check \"{bin,example,src,test}/**/*.ts\" --exclude=\"test/fixture/**\" --exclude=\"dist/\" && npm run clean && tsc --noEmit",
     "shlint": "bash -n bin/*.sh",
     "pretest": "npm run clean && npm run lint && npm run dist",
     "sloc": "sloc bin example src test index.ts --details --format cli-table --keys total,source,comment && sloc bin example src test index.ts",

src/message.ts

@@ -573,6 +573,7 @@ export class Message implements Sayable {
   public say(mediaMessage: MediaMessage, replyTo?: Contact | Contact[]): Promise<any>
 
   public say(textOrMedia: string | MediaMessage, replyTo?: Contact|Contact[]): Promise<any> {
+    /* tslint:disable:no-use-before-declare */
     const content = textOrMedia instanceof MediaMessage ? textOrMedia.filename() : textOrMedia
     log.verbose('Message', 'say(%s, %s)', content, replyTo)
     let m
@@ -598,6 +599,7 @@ export class Message implements Sayable {
         }
         m.content(mentionList + ' ' + textOrMedia)
       }
+    /* tslint:disable:no-use-before-declare */
     } else if (textOrMedia instanceof MediaMessage) {
       m = textOrMedia
       const room = this.room()

tslint.json

@@ -12,7 +12,7 @@
     "jsdoc-require": [
       false
     ],
-   "ban": false,
+    "ban": false,
     "class-name": true,
     "comment-format": [
       true,
@@ -62,6 +62,7 @@
     "no-switch-case-fall-through": true,
     "no-trailing-whitespace": true,
     "no-unused-expression": true,
+    "no-unused-variable": true,
     "no-use-before-declare": true,
     "no-var-keyword": true,
     "no-var-requires": false,