chore: bring back jest.js

Author: antfu

jest.js

@@ -0,0 +1,10 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+const { transform } = require('./dist/index')
+
+module.exports = {
+  process(source, filename, ...args) {
+    const transformed = transform(source, filename)
+    const code = transformed ? transformed.code : source
+    return require('vue-jest').process.call(this, code, filename, ...args)
+  },
+}