Files inside the routes/ folder can export middlewares that run before any rendering happens. They are expected to be available as a named export called handler. This rule checks for when the export was incorrectly named handlers instead of handler.

Invalid:

export const handlers = {
  GET() {},
  POST() {},
};
export function handlers() {}
export async function handlers() {}

Valid:

export const handler = {
  GET() {},
  POST() {},
};
export function handler() {}
export async function handler() {}