docs: add transformIgnorePatterns option

with default value.

Allows easier customisation when exceptions have to be added.

Author: LinusBorg

packages/@vue/cli-plugin-unit-jest/generator/index.js

@@ -23,6 +23,7 @@ module.exports = (api, _, __, invoking) => {
         '^.+\\.vue$': 'vue-jest',
         '.+\\.(css|styl|less|sass|scss|svg|png|jpg|ttf|woff|woff2)$': 'jest-transform-stub'
       },
+      tranformIgnorePatterns: ['/node_modules/'],
       // support the same @ -> src alias mapping in source code
       'moduleNameMapper': {
         '^@/(.*)$': '<rootDir>/src/$1'