Adding type to OptionDescriptor for rewrite-javascript and changing the @Option annotation to use the interface without said field for simplifying usage.

rewrite-javascript/rewrite/package.json

@@ -36,6 +36,7 @@
     "diff": "^7.0.0",
     "immer": "^10.1.1",
     "picomatch": "^4.0.3",
+    "reflect-metadata": "^0.2.2",
     "tmp-promise": "^3.0.3",
     "typescript": "^5.8.3",
     "vscode-jsonrpc": "^8.2.1"

rewrite-javascript/rewrite/src/recipe.ts

@@ -18,6 +18,7 @@ import {Cursor, SourceFile, Tree} from "./tree";
 import {ExecutionContext} from "./execution";
 import {DataTableDescriptor} from "./data-table";
 import {mapAsync} from "./util";
+import "reflect-metadata";
 
 const OPTIONS_KEY = "__recipe_options__";
 
@@ -88,7 +89,7 @@ export abstract class Recipe {
     }
 
     async descriptor(): Promise<RecipeDescriptor> {
-        const optionsRecord: Record<string, OptionDescriptor> = (this as any).constructor[OPTIONS_KEY] || {}
+        const optionsRecord: Record<string, OptionAnnotationDescriptor> = (this as any).constructor[OPTIONS_KEY] || {}
         return {
             name: this.name,
             displayName: this.displayName,
@@ -97,12 +98,39 @@ export abstract class Recipe {
             tags: this.tags,
             estimatedEffortPerOccurrence: this.estimatedEffortPerOccurrence,
             recipeList: await mapAsync(await this.recipeList(), async r => r.descriptor()),
-            options: Object.entries(optionsRecord).map(([key, descriptor]) => ({
-                name: key,
-                value: (this as any)[key],
-                required: descriptor.required ?? true,
-                ...descriptor
-            }))
+            options: Object.entries(optionsRecord).map(([key, descriptor]) => {
+                var t = Reflect.getMetadata("design:type", this, key);
+                var simplifiedType = t?.name ?? "string";
+                switch(t.name) {
+                    case "String": {
+                        simplifiedType = "string";
+                        break;
+                    }
+                    case "Boolean": {
+                        simplifiedType = "boolean";
+                        break;
+                    }
+                    case "Number": {
+                        simplifiedType = "number";
+                        break;
+                    }
+                    case "Symbol": {
+                        simplifiedType = "symbol";
+                        break;
+                    }
+                    case "Object": {
+                        simplifiedType = "object";
+                        break;
+                    }
+                }
+                return {
+                    name: key,
+                    value: (this as any)[key],
+                    required: descriptor.required ?? true,
+                    type: simplifiedType,
+                    ...descriptor
+                };
+            })
         }
     }
 
@@ -138,14 +166,18 @@ export interface RecipeDescriptor {
     readonly options: ({ name: string, value?: any } & OptionDescriptor)[]
 }
 
-export interface OptionDescriptor {
+export interface OptionAnnotationDescriptor {
     readonly displayName: string
     readonly description: string
     readonly required?: boolean
     readonly example?: string
     readonly valid?: string[]
 }
 
+export interface OptionDescriptor extends OptionAnnotationDescriptor {
+    readonly type: string;
+}
+
 export abstract class ScanningRecipe<P> extends Recipe {
     private readonly recipeAccMessage = Symbol("org.openrewrite.recipe.acc");
 
@@ -217,7 +249,7 @@ export class RecipeRegistry {
     }
 }
 
-export function Option(descriptor: OptionDescriptor) {
+export function Option(descriptor: OptionAnnotationDescriptor) {
     return function (target: any, propertyKey: string) {
         // Ensure the constructor has options storage.
         if (!target.constructor.hasOwnProperty(OPTIONS_KEY)) {

rewrite-javascript/rewrite/test/recipe.test.ts

@@ -40,7 +40,8 @@ describe("recipes", () => {
                     displayName: "Text",
                     name: "text",
                     required: true,
-                    value: undefined
+                    value: undefined,
+                    type: "string"
                 }
             ],
             recipeList: [],

rewrite-javascript/rewrite/tsconfig.json

@@ -13,7 +13,8 @@
     "skipLibCheck": true,
     "rootDir": ".",
     "outDir": "./dist",
-    "experimentalDecorators": true
+    "experimentalDecorators": true,
+    "emitDecoratorMetadata": true
   },
   "include": [
     "src/**/*",