topic Re: Typescript error TS2349 on view.goTo in ArcGIS JavaScript Maps SDK Questions

Typescript error TS2349 on view.goTo

mingleidi — Mon, 18 Dec 2017 22:41:04 GMT

The goto function working fine, just this tslint error breaks the build.

Does anyone have similar issues? below is my code:

if(matchedGraphic != null) {

let point = matchedGraphic.geometry as Point;

this.view.goTo({

center: [point.longitude, point.latitude],

zoom: 8

}, {

speedFactor: 6,

easing: "linear"

});

this.view.popup.open({

features: [matchedGraphic], // array of graphics

featureMenuOpen: true, // selected features initially display in a list

location: matchedGraphic.geometry

});

}

The typing file is:

Just don't understand why tslint give this error, can someone shed some lights?

Thanks!

Re: Typescript error TS2349 on view.goTo

mingleidi — Tue, 19 Dec 2017 21:11:12 GMT

After spent some time on google, seems it's because view.goto() uses union types which typescript doesn't like, one solution is to change source code to use method overload, which is not an option for me. Are there any other ways to resolve it?

Re: Typescript error TS2349 on view.goTo

KellyHutchins — Tue, 19 Dec 2017 23:14:02 GMT

I just ran a quick test using the latest version of the API (4.6) and the typings from here and when I didn't get any errors when transpiling. Here's the code I used.

import Map = require("esri/Map");

import MapView = require("esri/views/MapView");

import Basemap = require("esri/Basemap");

const map = new Map({

basemap: Basemap.fromId("streets")

});

const view = new MapView({

map: map,

container: "viewDiv",

center: [-118.244, 34.052] as any,

zoom: 12

});

view.when(() => {

view.goTo({

center: [32.71, -117.16],

zoom: 8

})

});

Re: Typescript error TS2349 on view.goTo

mingleidi — Wed, 20 Dec 2017 18:35:04 GMT

Thanks Kelly, I downloaded the new type file and still get same error, could it because npm packages I used are different? here're what I used:

"typescript": "^2.6.2",

"ts-loader": "^3.2.0",

"tslint": "^5.8.0",

Could you upload your sample project?

Thanks!

Re: Typescript error TS2349 on view.goTo

KellyHutchins — Wed, 20 Dec 2017 18:50:31 GMT

It could be a version thing. I am using Visual Studio Code and the version I'm using has TypeScript 2.6.1. and TSLint from here: GitHub - Microsoft/vscode-tslint: A tslint integration for vscode

I've attached my test app.

Re: Typescript error TS2349 on view.goTo

mingleidi — Thu, 21 Dec 2017 18:34:38 GMT

Thanks Kelly, after compared your project with mine, I found the cause is that my view is declared as union type:

view: MapView | SceneView;

even if these two views has same goTo functions, typescript still doesn't like it, after manually cast my view to specific type, the error is gone, the error message is kind of misleading.

Thanks again for your help. much appreciated!