nuxt/dist/pages/runtime/composables.js

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import { getCurrentInstance } from "vue";
import { useRoute } from "vue-router";
const warnRuntimeUsage = (method) => console.warn(
  `${method}() is a compiler-hint helper that is only usable inside the script block of a single file component which is also a page. Its arguments should be compiled away and passing it at runtime has no effect.`
);
export const definePageMeta = (meta) => {
  if (process.dev) {
    const component = getCurrentInstance()?.type;
    try {
      const isRouteComponent = component && useRoute().matched.some((p) => Object.values(p.components || {}).includes(component));
      if (isRouteComponent) {
        return;
      }
    } catch {
    }
    warnRuntimeUsage("definePageMeta");
  }
};