Add codemod for async (#7)

.changeset/cyan-candles-float.md

@@ -0,0 +1,5 @@
+---
+"@effect/codemod": patch
+---
+
+Add codemod to turn async<a,b,c>() into async<c,b,a>() considering never as default

public/codemods/swap-type-params.ts

@@ -15,6 +15,17 @@ export default function transformer(file: cs.FileInfo, api: cs.API) {
     swapSchema(ast, j)
   })
 
+  root.find(j.CallExpression).forEach(ast => {
+    if (
+      ast.value.typeParameters?.params.length === 3
+      && expressionHasName(ast.value.callee, "async")
+    ) {
+      ast.value.typeParameters.params.reverse()
+      popNever(ast.value.typeParameters.params)
+      popNever(ast.value.typeParameters.params)
+    }
+  })
+
   return root.toSource()
 }
 
@@ -62,6 +73,20 @@ const popNever = (params: Array<k.TSTypeKind>) => {
   }
 }
 
+const expressionHasName = (ast: k.ExpressionKind, name: string): boolean => {
+  switch (ast.type) {
+    case "Identifier": {
+      return ast.name === name
+    }
+    case "MemberExpression": {
+      return expressionHasName(ast.property, name)
+    }
+    default: {
+      return false
+    }
+  }
+}
+
 const hasName = (reference: cs.ASTPath<cs.TSTypeReference>, name: string) => {
   const initial = reference.value.typeName
   const loop = (node: typeof initial): boolean => {