chore: migrate src/USKeyboardLayout to typescript (#5695)

* chore: migrate `src/USKeyboardLayout` to typescript

Don't think we need to expose the interface type for the keycodes so
I've left it local for now.

* retry windows unit tests

.travis.yml

@@ -23,7 +23,7 @@ jobs:
       script:
         - ls .local-chromium .local-firefox
         - npm run tsc
-        - npm run unit
+        - travis_retry npm run unit
     - node_js: "10.19.0"
       dist: trusty
       env:

src/Input.js

@@ -15,10 +15,10 @@
  */
 
 const {assert} = require('./helper');
-const keyDefinitions = require('./USKeyboardLayout');
 // CDPSession is used only as a typedef
 // eslint-disable-next-line no-unused-vars
 const {CDPSession} = require('./Connection');
+const {keyDefinitions} = require('./USKeyboardLayout');
 
 /**
  * @typedef {Object} KeyDescription

src/USKeyboardLayout.ts

@@ -14,22 +14,18 @@
  * limitations under the License.
  */
 
-/**
- * @typedef {Object} KeyDefinition
- * @property {number=} keyCode
- * @property {number=} shiftKeyCode
- * @property {string=} key
- * @property {string=} shiftKey
- * @property {string=} code
- * @property {string=} text
- * @property {string=} shiftText
- * @property {number=} location
- */
+ interface KeyDefinition {
+   keyCode?: number;
+   shiftKeyCode?: number;
+   key?: string;
+   shiftKey?: string;
+   code?: string;
+   text?: string;
+   shiftText?: string;
+   location?: number;
+ }
 
-/**
- * @type {Object<string, KeyDefinition>}
- */
-module.exports = {
+export const keyDefinitions: Readonly<Record<string, KeyDefinition>> = {
   '0': {'keyCode': 48, 'key': '0', 'code': 'Digit0'},
   '1': {'keyCode': 49, 'key': '1', 'code': 'Digit1'},
   '2': {'keyCode': 50, 'key': '2', 'code': 'Digit2'},
@@ -285,4 +281,4 @@ module.exports = {
   'EndCall': {'keyCode': 95, 'key': 'EndCall', 'code': 'EndCall', 'location': 4},
   'VolumeDown': {'keyCode': 182, 'key': 'VolumeDown', 'code': 'VolumeDown', 'location': 4},
   'VolumeUp': {'keyCode': 183, 'key': 'VolumeUp', 'code': 'VolumeUp', 'location': 4},
-};
+};