test: enable no-fallthrough lint rule

The `no-fallthrough` rule is now enabled and all failures
have been addressed within the code.

Author: clydin

.eslintrc.json

@@ -101,7 +101,6 @@
 
     /* TODO: evaluate usage of these rules and fix issues as needed */
     "no-case-declarations": "off",
-    "no-fallthrough": "off",
     "no-underscore-dangle": "off",
     "@typescript-eslint/ban-types": "off",
     "@typescript-eslint/no-implied-eval": "off",

packages/angular/build/src/builders/extract-i18n/options.ts

@@ -42,8 +42,8 @@ export async function normalizeOptions(
   // Normalize xliff format extensions
   let format = options.format;
   switch (format) {
-    case undefined:
     // Default format is xliff1
+    case undefined:
     case Format.Xlf:
     case Format.Xlif:
     case Format.Xliff:

packages/angular_devkit/build_angular/src/builders/extract-i18n/options.ts

@@ -42,8 +42,8 @@ export async function normalizeOptions(
   // Normalize xliff format extensions
   let format = options.format;
   switch (format) {
-    case undefined:
     // Default format is xliff1
+    case undefined:
     case Format.Xlf:
     case Format.Xlif:
     case Format.Xliff:

packages/angular_devkit/build_angular/src/tools/babel/webpack-loader.ts

@@ -200,8 +200,7 @@ export default custom<ApplicationPresetOptions>(() => {
                   case 'error':
                     this.emitError(message);
                     break;
-                  case 'info':
-                  // Webpack does not currently have an informational diagnostic
+                  case 'info': // Webpack does not currently have an informational diagnostic
                   case 'warning':
                     this.emitWarning(message);
                     break;