JavaScript question. This code should log FAIL 1 in the first part, but is it true that the second part is host-defined?

await deleteFileIfExists("./mod.js");

try {
  await import("./mod.js");
  console.log("OK 1");
} catch {
  console.log("FAIL 1");
}

await createFile("./mod.js", "export const x = 1");

try {
  await import("./mod.js");
  console.log("OK 2");
} catch {
  console.log("FAIL 2");
}

do Node, Deno and Firefox module systems support query params as a way to force a fresh module?

import(`./mod.js?n=${i++}`);