Cannot find name 'sensors'.

[anilkunchalaece]

Hi,
I tried the demo code for ionic 3 but i got "Cannot find name 'sensors " error.

This is my ionic info

   @ionic/cli-utils  : 1.19.0
    ionic (Ionic CLI) : 3.19.0

global packages:

    cordova (Cordova CLI) : 7.1.0 

local packages:

    @ionic/app-scripts : 3.1.8
    Cordova Platforms  : android 6.3.0
    Ionic Framework    : ionic-angular 3.9.2

System:

    Node : v6.11.2
    npm  : 3.10.10 
    OS   : Linux 4.8

and the error is

[23:34:29]  typescript: src/pages/sensor/sensor.ts, line: 30 
            Cannot find name 'sensors'. 

      L29:  console.log('get data')
      L30:  sensors.enableSensor("PROXIMITY")
      L31:  sensors.getState((values) => {

[23:34:29]  typescript: src/pages/sensor/sensor.ts, line: 31 
            Cannot find name 'sensors'. 

      L30:  sensors.enableSensor("PROXIMITY")
      L31:  sensors.getState((values) => {
      L32:    console.log(JSON.stringify(values))

Error: Failed to transpile program
    at BuildError.Error (native)