Fix: no duplicates in Path type generated by Integration (#2251)

Found this one during my work on #2226

CHANGELOG.md

@@ -4,7 +4,9 @@
 
 ### v21.6.1
 
-- `node-mocks-http` version is `^1.16.2`.
+- `node-mocks-http` version is `^1.16.2`;
+- Fixed possible duplicates in the `Path` type generated by `Integration`:
+  - Duplicates used to be possible when using `DependsOnMethod` instance within specified `routing`.
 
 ### v21.6.0
 

src/integration.ts

@@ -107,7 +107,7 @@ export class Integration {
     ReturnType<typeof quoteProp>, // method+path
     Record<IOKind, string> & { isJson: boolean; tags: ReadonlyArray<string> }
   >();
-  protected paths: string[] = [];
+  protected paths = new Set<string>();
   protected aliases = new Map<z.ZodTypeAny, ts.TypeAliasDeclaration>();
   protected ids = {
     pathType: f.createIdentifier("Path"),
@@ -209,7 +209,7 @@ export class Integration {
         negativeResponse,
         genericResponse,
       );
-      this.paths.push(path);
+      this.paths.add(path);
       const isJson = endpoint
         .getResponses("positive")
         .some(({ mimeTypes }) => mimeTypes?.includes(contentTypes.json));
@@ -226,7 +226,9 @@ export class Integration {
     this.program.unshift(...this.aliases.values());
 
     // export type Path = "/v1/user/retrieve" | ___;
-    this.program.push(makePublicLiteralType(this.ids.pathType, this.paths));
+    this.program.push(
+      makePublicLiteralType(this.ids.pathType, Array.from(this.paths)),
+    );
 
     // export type Method = "get" | "post" | "put" | "delete" | "patch";
     this.program.push(makePublicLiteralType(this.ids.methodType, methods));