message: Clarify where resolve error comes from in dynamic import plugin.
diff: @@ -97,7 +97,9 @@ const maybeResolve = (
  // Don't warn if the specifier was already a path, even though we do
  // resolve paths, because maybe the user is serving it some other
  // way.
  - console.warn(`Could not resolve module specifier "${specifier}"`);
  + console.warn(
  + `Could not resolve module specifier "${specifier}" ` +
  + `in file "${filePath}".`);
  }
  return specifier;
  }
  