Error handling (#104)

- Throw errors if you miss required parameters in getAuthToken.
- Add an escape hatch if a Transfer `error` response isn't a string, as expected.
- Upgrade react-scripts in the doc / playground.
- Replace react-app-rewired in documentation for something else. That means that there's no more styled-components babel support, unfortunately.

documentation/package.json

@@ -7,14 +7,14 @@
     "react": "^16.8.6",
     "react-dom": "^16.8.6",
     "react-markdown": "^4.0.8",
-    "react-scripts": "2.1.8",
+    "react-scripts": "^3.1.1",
     "react-syntax-highlighter": "^10.2.1",
     "styled-components": "^4.2.0"
   },
   "scripts": {
-    "start": "react-app-rewired start",
-    "build": "react-app-rewired build",
-    "test": "react-app-rewired test",
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
     "eject": "react-scripts eject"
   },
   "eslintConfig": {
@@ -28,7 +28,7 @@
   ],
   "devDependencies": {
     "raw-loader": "^2.0.0",
-    "react-app-rewire-styled-components": "^3.0.2",
-    "react-app-rewired": "^2.1.3"
+    "raw.macro": "^0.3.0",
+    "react-app-rewire-styled-components": "^3.0.2"
   }
 }

documentation/src/App.js

@@ -1,7 +1,6 @@
 import React, { useState } from "react";
 import styled from "styled-components";
-
-import README from "README.md";
+import raw from "raw.macro";
 
 import { DisplayItem } from "components/DisplayItem";
 import { Markdown } from "components/Markdown";
@@ -13,6 +12,8 @@ import { StateProvider } from "AppState";
 
 import docs from "./docs.json";
 
+const README = raw("../../README.md");
+
 const SIDEBAR_WIDTH = 300;
 
 const El = styled.div`
@@ -130,6 +131,11 @@ export const App = () => {
 
   const libraryExports = Object.keys(LIBRARY_EXPORTS).reduce((memo, name) => {
     const item = itemsByName[name];
+
+    if (!item) {
+      return memo;
+    }
+
     const kind = item.kindString;
 
     return {

playground/package.json

@@ -9,7 +9,7 @@
     "react-dom": "^16.8.5",
     "react-json-view": "^1.19.1",
     "react-router-dom": "^5.0.0",
-    "react-scripts": "2.1.8",
+    "react-scripts": "^3.1.1",
     "stellar-sdk": "^2.3.0"
   },
   "scripts": {