Import source-map-support package

Changed also some wrong return undefined statements based on the TypeScript definitions of the package.

app/src/lib/source-map-support.ts

@@ -1,7 +1,7 @@
 import * as Path from 'path'
 import * as Fs from 'fs'
 import fileUriToPath from 'file-uri-to-path'
-const sourceMapSupport = require('source-map-support')
+import sourceMapSupport from 'source-map-support'
 
 /**
  * This array tells the source map logic which files that we can expect to
@@ -38,9 +38,9 @@ function retrieveSourceMap(source: string) {
         return { url: Path.basename(path), map: xhr.responseText }
       }
     } catch (error) {
-      return
+      return null
     }
-    return
+    return null
   }
 
   // We don't have an option here, see
@@ -49,7 +49,7 @@ function retrieveSourceMap(source: string) {
   // property on an error object and has to be synchronous :/
   // eslint-disable-next-line no-sync
   if (!Fs.existsSync(path)) {
-    return
+    return null
   }
 
   try {
@@ -57,7 +57,7 @@ function retrieveSourceMap(source: string) {
     const map = Fs.readFileSync(path, 'utf8')
     return { url: Path.basename(path), map }
   } catch (error) {
-    return
+    return null
   }
 }
 

package.json

@@ -152,6 +152,7 @@
     "@types/react-virtualized": "^9.7.12",
     "@types/request": "^2.0.9",
     "@types/semver": "^5.5.0",
+    "@types/source-map-support": "^0.5.2",
     "@types/strip-ansi": "^3.0.0",
     "@types/temp": "^0.8.29",
     "@types/textarea-caret": "^3.0.0",

yarn.lock

@@ -584,6 +584,14 @@
     "@types/express-serve-static-core" "*"
     "@types/mime" "*"
 
+"@types/source-map-support@^0.5.2":
+  version "0.5.2"
+  resolved "https://registry.yarnpkg.com/@types/source-map-support/-/source-map-support-0.5.2.tgz#35e7446d470e63ec3fff4d7eceee0bc40efad239"
+  integrity sha512-krvWmwQ2Pzr+Yp8tKjhKC9UguRNg1ev9mNdlVVpVJvU9iynulYZsx3ydf1SPzNNxzhmbWAOAIw5hMWhAMDc2NA==
+  dependencies:
+    "@types/node" "*"
+    source-map "^0.6.0"
+
 "@types/source-map@*":
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/@types/source-map/-/source-map-0.5.1.tgz#7e74db5d06ab373a712356eebfaea2fad0ea2367"