feat: export built-in transformations

Author: haoqunjiang

src/index.ts

@@ -3,3 +3,5 @@
 export { default as VueTransformation } from './VueTransformation'
 
 export { default as runTransformation } from './run-transformation'
+
+export { default as transformations } from '../transformations'

transformations/index.ts

@@ -1,5 +1,12 @@
+import type { Transform, Parser } from 'jscodeshift'
+
+type JSTransformationModule = {
+  default: Transform
+  parser?: string | Parser
+}
+
 const transformationMap: {
-  [name: string]: Function
+  [name: string]: JSTransformationModule
 } = {
   'new-global-api': require('./new-global-api'),
   'vue-router-v4': require('./vue-router-v4'),