Install and use promise-polyfill

entrypoint.sh

@@ -4,5 +4,7 @@
 # container a lot heavier, but we don't spin up many instances, or often,
 # so it doesn't matter.
 
-npm run build
-serve -s build -l 8080
+#npm run build
+#serve -s build -l 8080
+
+npm start -- --port 8080

package.json

@@ -16,6 +16,7 @@
     "pcic-react-leaflet-components": "git+https://git@github.com/pacificclimate/pcic-react-leaflet-components.git",
     "proj4": "^2.5.0",
     "proj4leaflet": "^1.0.2",
+    "promise-polyfill": "8.1.3",
     "prop-types": "^15.6.2",
     "react": "^16.13.1",
     "react-bootstrap": "^1.0.1",

src/index.js

@@ -6,6 +6,7 @@ import ExternalText from './temporary/external-text';
 import ErrorBoundary from './components/misc/ErrorBoundary';
 import App from './components/app-root/App';
 import { makeYamlLoader } from './utils/external-text';
+import 'promise-polyfill/src/polyfill';
 
 
 const loadTexts = makeYamlLoader(

src/temporary/external-text.js

@@ -198,6 +198,7 @@ export function get(
       }
       return (<ReactMarkdown escapeHtml={false} source={source} {...props}/>);
     } catch (e) {
+      console.trace();
       return whenErrorResponse(
         as, whenError, `Error in external text '${path}': ${e.toString()}.`
       );