typescript - Ionic + Jasmine + Tslint - Property 'and' does not exist on type -

everybody. building ionic app on boilerplate. right now, building tests specific page , using jasmine mock providers , set expected behavior methods. that's how beforeeach() method looks looks like:

    beforeeach(() => {           mockloadingcontroller = jasmine.createspyobj('modalcontroller', ['create', 'present', 'dismiss']);           mockloadingcontroller.create.and.returnvalue(mockloadingcontroller);            mockmodalcontroller =  jasmine.createspyobj('loadingcontroller', ['create', 'present',             'ondiddismiss', 'dismiss']);           mockmodalcontroller.create.and.returnvalue(mockmodalcontroller);            mockgeolocation =  jasmine.createspyobj('geolocation', ['getcurrentposition']);            mockgeolocation.getcurrentposition.and.callfake(( ) => {             return {then: ( ) => { }};           });           mockevents = jasmine.createspyobj('events', ['publish', 'subscribe']);           testbed.configuretestingmodule({             schemas: [custom_elements_schema],             providers: [               { provide: navcontroller, usevalue: mocknavcontroller },               { provide: loadingcontroller, usevalue: mockloadingcontroller },               { provide: modalcontroller, usevalue: mockmodalcontroller },               { provide: geolocation, usevalue: mockgeolocation },               { provide: events, usevalue: mockevents },               locationpage,             ],           },     ); } ); 

the problem starts when define promise return getcurrentposition method:

    mockgeolocation.getcurrentposition.and.callfake(( ) => {             return {then: ( ) => { }};     }); 

i using tslint while testing and, gives me following error

error in [at-loader] ./src/pages/location/location.page.spec.ts:24:40      ts2339: property 'and' not exist on type '(options?: geolocationoptions) => promise<geoposition>'. 

the question is: how can overcame matter tslint not complain code anymore?

problem solved! forgot detail way declaring variables:

describe('location page', () => {   let mockloadingcontroller: any;   let mockmodalcontroller: any;   let mockgeolocation: geolocation;   let mockevents: events;   beforeeach(() => {   //rest of code here 

as can see, defined type mockgeolocation variable , did set others any. setting variables works jasmine , not generate error in tslint.

so correct code works this:

describe('location page', () => {   let mockloadingcontroller: any;   let mockmodalcontroller: any;   let mockgeolocation: any;   let mockevents: any;   beforeeach(() => {