feat: add preprocessor plugin, exclude from gitignore

.gitignore

@@ -16,3 +16,6 @@ yarn-error.log*
 # Mac OSX Finder files.
 **/.DS_Store
 .DS_Store
+
+# Exclude Cypress Plugin JS files
+!src/schematics/cypress/files/cypress/plugins/*.js

src/schematics/cypress/files/cypress/plugins/cy-ts-preprocessor.js

@@ -0,0 +1,26 @@
+const wp = require("@cypress/webpack-preprocessor");
+
+const webpackOptions = {
+  resolve: {
+    extensions: [".ts", ".js"]
+  },
+  module: {
+    rules: [
+      {
+        test: /\.ts$/,
+        exclude: [/node_modules/],
+        use: [
+          {
+            loader: "ts-loader"
+          }
+        ]
+      }
+    ]
+  }
+};
+
+const options = {
+  webpackOptions
+};
+
+module.exports = wp(options);

src/schematics/cypress/files/cypress/plugins/index.js

@@ -0,0 +1,5 @@
+const cypressTypeScriptPreprocessor = require("./cy-ts-preprocessor");
+
+module.exports = on => {
+  on("file:preprocessor", cypressTypeScriptPreprocessor);
+};