Fixed "Cannot read property ... of undefined"

Author: bsiever

absmouse.ts

@@ -7,10 +7,12 @@ namespace absmouse {
     //% shim=absmouse::startAbsoluteMouseService
     //% weight=50
     export function startAbsoluteMouseService() : void {
+        return
     }
 
     //% shim=absmouse::_send
     function _send(x: number, y: number, buttons: number) : void { 
+        return
     }
 
     //% blockId="move absolute mouse xy" block="move absolute mouse | x to $x| and y to $y"
@@ -55,6 +57,7 @@ namespace absmouse {
     //% shim=absmouse::setStatusChangeHandler 
     //% weight=20
     export function setStatusChangeHandler(a: Action) {
+        return
     }
 
     //% blockId="absolute mouse enabled" block="absolute mouse enabled" advanced=true

gamepad.ts

@@ -44,10 +44,12 @@ namespace gamepad {
     //% shim=gamepad::startGamepadService
     //% weight=50
     export function startGamepadService() : void {
+        return
     }
 
     //% shim=gamepad::_send
     function _send(buttons: number, xyzrx: number, dpad: number) : void { 
+        return
     }
 
 
@@ -95,6 +97,7 @@ namespace gamepad {
     //% shim=gamepad::setStatusChangeHandler 
     //% weight=20
     export function setStatusChangeHandler(a: Action) {
+        return
     }
 
     //% blockId="gamepad enabled" block="gamepad enabled" advanced=true

keyboard.ts

@@ -36,18 +36,21 @@ namespace keyboard {
     //% shim=keyboard::startKeyboardService
     //% weight=50
     export function startKeyboardService() : void {
+        return
     }
 
     //% blockId="send string" block="send keys | $keys" 
     //% shim=keyboard::sendString
     //% weight=40
     export function sendString(keys: string) : void {
+        return
     }
 
     //% blockID="keyboard on status change" block="on keyboard status change" advanced=true
     //% shim=keyboard::setStatusChangeHandler 
     //% weight=20
     export function setStatusChangeHandler(a: Action) {
+        return
     }
 
     //% blockId="keyboard enabled" block="keyboard enabled" advanced=true
@@ -152,11 +155,13 @@ namespace keyboard {
     //% shim=keyboard::sendSimultaneousKeys
     //% weight=50
     export function sendSimultaneousKeys(keys: string, hold: boolean) : void {
+        return
     }
 
     //% blockId="release keys" block="release keys" advanced=true
     //% shim=keyboard::releaseKeys
     //% weight=40
     export function releaseKeys() : void {
+        return
     }
 }

media.ts

@@ -20,19 +20,22 @@ namespace media {
     //% shim=media::startMediaService
     //% weight=50
     export function startMediaService() : void {
+        return
     }
 
     //% blockId="send code" block="send code | $code" 
     //% code.shadow="mediakey_conv"
     //% shim=media::sendCode
     //% weight=40
     export function sendCode(code: number) : void {
+        return
     }
 
     //% blockID="media on status change" block="on media status change" advanced=true
     //% shim=media::setStatusChangeHandler 
     //% weight=20
     export function setStatusChangeHandler(a: Action) {
+        return
     }
 
     //% blockId="media enabled" block="media enabled" advanced=true

mouse.ts

@@ -7,10 +7,12 @@ namespace mouse {
     //% shim=mouse::startMouseService
     //% weight=50
     export function startMouseService() : void {
+        return
     }
 
     //% shim=mouse::_send
     function _send(x: number, y: number, scroll: number, buttons: number) : void { 
+        return
     }
 
     //% blockId="move mouse xy" block="move mouse | x by $x| and y by $y"
@@ -59,6 +61,7 @@ namespace mouse {
     //% shim=mouse::setStatusChangeHandler 
     //% weight=20
     export function setStatusChangeHandler(a: Action) {
+        return
     }
 
     //% blockId="mouse enabled" block="mouse enabled" advanced=true

pxt.json

@@ -46,7 +46,7 @@
     ],
     "public": true,
     "targetVersions": {
-        "target": "4.0.16",
+        "target": "4.0.17",
         "targetId": "microbit"
     },
     "supportedTargets": [