nextjs - 💡(How to fix) Fix Layouts for paths that start with underscore (%5F) produces error for dev types of LayoutRoutes

.next/dev/types/validator.ts:24:44 - error TS2344: Type 'Route' does not satisfy the constraint 'LayoutRoutes'.
  Type 'import("/path/to/my-app-16.2.6/.next/dev/types/routes").LayoutRoutes' is not assignable to type 'import("/path/to/my-app-16.2.6/.next/types/routes").LayoutRoutes'.
    Type '"/%5Ffoo"' is not assignable to type 'LayoutRoutes'.

24   default: React.ComponentType<LayoutProps<Route>> | ((props: LayoutProps<Route>) => React.ReactNode | Promise<React.ReactNode> | never | void | Promise<void>)
                                              ~~~~~

.next/dev/types/validator.ts:24:75 - error TS2344: Type 'Route' does not satisfy the constraint 'LayoutRoutes'.
  Type 'import("/path/to/my-app-16.2.6/.next/dev/types/routes").LayoutRoutes' is not assignable to type 'import("/path/to/my-app-16.2.6/.next/types/routes").LayoutRoutes'.
    Type '"/%5Ffoo"' is not assignable to type 'LayoutRoutes'.

24   default: React.ComponentType<LayoutProps<Route>> | ((props: LayoutProps<Route>) => React.ReactNode | Promise<React.ReactNode> | never | void | Promise<void>)
                                                                             ~~~~~

.next/dev/types/validator.ts:67:31 - error TS2344: Type 'typeof import("/path/to/my-app-16.2.6/app/%5Ffoo/layout")' does not satisfy the constraint 'LayoutConfig<"/%5Ffoo">'.
  Types of property 'default' are incompatible.
    Type '({ children }: LayoutProps<"/_foo">) => Element' is not assignable to type 'ComponentType<LayoutProps<"/%5Ffoo">> | ((props: LayoutProps<"/%5Ffoo">) => void | ReactNode | Promise<ReactNode> | Promise<...>)'.
      Type '({ children }: LayoutProps<"/_foo">) => Element' is not assignable to type 'FunctionComponent<LayoutProps<"/%5Ffoo">>'.
        Types of parameters '__0' and 'props' are incompatible.
          Type 'LayoutProps<"/%5Ffoo">' is not assignable to type 'LayoutProps<"/_foo">'.
            Type 'LayoutProps<"/%5Ffoo">' is not assignable to type '{ params: Promise<{}>; children: ReactNode; }'.
              Types of property 'params' are incompatible.
                Type 'Promise<unknown>' is not assignable to type 'Promise<{}>'.
                  Type 'unknown' is not assignable to type '{}'.

67   type __Check = __IsExpected<typeof handler>
                                 ~~~~~~~~~~~~~~


Found 3 errors in the same file, starting at: .next/dev/types/validator.ts:24

---

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.6.0: Wed Nov  5 21:32:34 PST 2025; root:xnu-11417.140.69.705.2~1/RELEASE_ARM64_T6020
  Available memory (MB): 16384
  Available CPU cores: 10
Binaries:
  Node: 24.11.1
  npm: 11.6.2
  Yarn: N/A
  pnpm: 10.28.0
Relevant Packages:
  next: 16.2.6 // Latest available version is detected (16.2.6).
  eslint-config-next: N/A
  react: 19.2.4
  react-dom: 19.2.4
  typescript: 5.9.3
Next.js Config:
  output: N/A