feat(TextResources): add support for defaultValue in variables in tex…

schemas/json/text-resources/text-resources.schema.v1.json

@@ -88,6 +88,11 @@
             { "$ref": "#/definitions/dataSource-instanceContext" },
             { "$ref": "#/definitions/dataSource-applicationSettings" }
           ]
+        },
+        "defaultValue": {
+          "type": "string",
+          "title": "Default value of a variable",
+          "description": "The default value that you want to display if there is no value in the data model for the variable."
         }
       },
       "required": [

src/hooks/useLanguage.ts

@@ -295,6 +295,16 @@ function replaceVariables(text: string, variables: IVariable[], dataSources: Tex
       value = applicationSettings && variable.key in applicationSettings ? applicationSettings[variable.key] : value;
     }
 
+    if (value === variable.key) {
+      /*
+       By returning value if variable.defaultValue is null, we ensure
+       that we are returning the dataModel path string instead of blank
+       value. If app developers want to return blank value, they should
+       set defaultValue to a blank space.
+      */
+      value = variable.defaultValue || value;
+    }
+
     out = out.replaceAll(`{${idx}}`, value);
   }
 

src/types/shared.ts

@@ -240,6 +240,7 @@ export interface ITextResource {
 export interface IVariable {
   key: string;
   dataSource: string;
+  defaultValue?: string;
 }
 
 export interface IAttachmentGrouping {