https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/using-map-components-how-to-set/m-p/1659559#M87741 <P>To fix this issue, update to v4.34.x of map-components. A new property has been added to ArcgisMap that allows you to lock the spatial reference. Line 41 of the code in the original post should read:</P><LI-CODE lang="javascript">this.arcgisMap.spatialReferenceLocked = true;</LI-CODE> Wed, 22 Oct 2025 10:13:08 GMT AJasper 2025-10-22T10:13:08Z https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/using-map-components-how-to-set/m-p/1647362#M87574 <P>I'm using arcgis/map-components in my app and I'm having a bit of a problem setting the&nbsp;spatialReferenceLocked of the map view. See code below (TypeScript/Angular).</P><LI-CODE lang="javascript"> const sr = new SpatialReference({ wkid: 27700, }); this.arcgisMap = this.mapViewElement?.nativeElement as ArcgisMap; let baseLayer: Layer; if (environment.baseLayerType === 'VectorTileLayer') { baseLayer = new VectorTileLayer({ url: environment.baseMapUrl, title: 'Great Britain', }); } else { baseLayer = new TileLayer({ url: environment.baseMapUrl, title: 'Great Britain', }); } const extent = new Extent({ xmin: -100000, ymin: -30000, xmax: 710000, ymax: 1250000, spatialReference: sr.clone(), }); const map = new Map({ basemap: new Basemap({ baseLayers: [baseLayer], spatialReference: sr.clone(), }), }); this.arcgisMap.extent = extent; this.arcgisMap.constraints.maxScale = 0; this.arcgisMap.constraints.lods = TileInfo.create({ spatialReference: extent.spatialReference.clone(), }).lods; this.arcgisMap.view.spatialReferenceLocked = true; this.arcgisMap.map = map;</LI-CODE><P>&nbsp;On line 41 where the spatialReferenceLocked property is being set to true (filters out basemaps as using basemap gallery) it errors with the error&nbsp;</P><LI-CODE lang="javascript">[esri.core.Accessor] cannot assign to construct-only property 'spatialReferenceLocked'</LI-CODE><P>I cannot figure out how I set this property, any help would be greatly appreaciated.</P><P>Thanks,</P><P>Adam</P> Tue, 02 Sep 2025 15:37:22 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/using-map-components-how-to-set/m-p/1647362#M87574 AJasper 2025-09-02T15:37:22Z https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/using-map-components-how-to-set/m-p/1659559#M87741 <P>To fix this issue, update to v4.34.x of map-components. A new property has been added to ArcgisMap that allows you to lock the spatial reference. Line 41 of the code in the original post should read:</P><LI-CODE lang="javascript">this.arcgisMap.spatialReferenceLocked = true;</LI-CODE> Wed, 22 Oct 2025 10:13:08 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/using-map-components-how-to-set/m-p/1659559#M87741 AJasper 2025-10-22T10:13:08Z