Repository: kiwicom/mobile (js)

Issue:
Improve translation component
Now if translation is passed a null or undefined value in passThrough prop, it will display the string null or the string undefined. It should rather return null than the string null. 

Pull request description:
Localization: have translation render null instead of string null when passThrough is undefined
closes #1311 

Patch:
diff --git a/packages/localization/src/Translation.js b/packages/localization/src/Translation.js
index ee889510..2605b183 100644
--- a/packages/localization/src/Translation.js
+++ b/packages/localization/src/Translation.js
@@ -71,6 +71,9 @@ export default class Translation extends React.Component<Props> {
     if (this.props.id === undefined) {
       // ID prop is missing so let's assume it's "pass through" translation
       // (property passThrough may be undefined)
+      if (this.props.passThrough == null) {
+        return null;
+      }
       return (
         <Text style={containerStyle}>
           {/* $FlowExpectedError: we do not allow to use 'string' in the 'Text' components but translations are exceptions. */}


Test patch:
diff --git a/packages/localization/src/__tests__/__snapshots__/Translation.test.js.snap b/packages/localization/src/__tests__/__snapshots__/Translation.test.js.snap
index c464a2b2..40c5e4df 100644
--- a/packages/localization/src/__tests__/__snapshots__/Translation.test.js.snap
+++ b/packages/localization/src/__tests__/__snapshots__/Translation.test.js.snap
@@ -1,10 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`works with optional pass through parameter 1`] = `
-<Text>
-  undefined
-</Text>
-`;
+exports[`works with optional pass through parameter 1`] = `null`;
 
 exports[`works with pass through translations 1`] = `
 <Text>