fix(transformers): expose transformerNotationMap

Author: antfu

packages/transformers/src/index.ts

@@ -6,6 +6,7 @@ export * from './transformers/notation-error-level'
 export * from './transformers/notation-focus'
 export * from './transformers/notation-highlight'
 export * from './transformers/notation-highlight-word'
+export * from './transformers/notation-map'
 export * from './transformers/remove-line-breaks'
 export * from './transformers/remove-notation-escape'
 export * from './transformers/render-whitespace'