# HG changeset patch
# User Lucas Thompson <dev@lucas.im>
# Date 1500643742 -3600
# Node ID 3c962af5342c153259f18fb14563c1e1557f79e1
# Parent  33b4106af9dd4ee8e3ab88e76df0cf7d8701f04f
Work-around for causing a compile error for non-exhaustive switch on discriminated union.

diff -r 33b4106af9dd -r 3c962af5342c src/app/visualisations/FeatureUtilities.ts
--- a/src/app/visualisations/FeatureUtilities.ts	Fri Jul 21 14:21:26 2017 +0100
+++ b/src/app/visualisations/FeatureUtilities.ts	Fri Jul 21 14:29:02 2017 +0100
@@ -109,7 +109,10 @@
   return ['vector', 'matrix', 'tracks'].includes(shape);
 }
 
-const throwShapeError = () => { throw new Error('No shape could be deduced'); };
+function throwShapeError(compileAssertion?: never) {
+  throw new Error('No shape could be deduced');
+}
+
 function deduceHigherLevelFeatureShape(response: SimpleResponse)
 : HigherLevelFeatureShape {
   const collection = response.features;
@@ -180,7 +183,7 @@
         }))
       };
   }
-  throwShapeError();
+  throwShapeError(deducedShape);
 }
 
 export interface PlotDataPoint {