use default variant value

Author: arsalan0c

src/reducers/states.ts

@@ -237,9 +237,9 @@ export const languageURLNames: Map<string, ISourceLanguage> = new Map([
   ['3_Non_Det', { chapter: 3, variant: 'non-det' }]
 ]);
 
-export const styliseChapter = (chap: number, variant?: Variant) => {
+export const styliseChapter = (chap: number, variant: Variant = 'default') => {
   let res = `Source \xa7${chap}`;
-  if (variant && variantDisplay.has(variant)) {
+  if (variantDisplay.has(variant)) {
     res += ' ' + variantDisplay.get(variant);
   }
   return res;

src/utils/slangHelper.ts

@@ -127,13 +127,9 @@ export function createContext<T>(
   chapter: number,
   externals: string[],
   externalContext: T,
-  variant?: Variant
+  variant: Variant = 'default'
 ) {
-  if (variant === undefined) {
-    return createSlangContext<T>(chapter, 'default', externals, externalContext, externalBuiltIns);
-  } else {
-    return createSlangContext<T>(chapter, variant, externals, externalContext, externalBuiltIns);
-  }
+  return createSlangContext<T>(chapter, variant, externals, externalContext, externalBuiltIns);
 }
 
 // Assumes that the grader doesn't need additional external libraries apart from the standard