message: Re-enable bare module specifier warning for actually unknown specifiers.
diff: @@ -93,8 +93,16 @@ const maybeResolve = (
  }
  return resolve(specifier, filePath, componentInfo);
  } catch (e) {
  - if (!isPathSpecifier(specifier)) {
  - // We should warn here if there's a helpful way to do that.
  + // `require` and `meta` are fake imports that our other build tooling
  + // injects, so we should not warn for them.
  + if (!isPathSpecifier(specifier) && specifier !== 'require' &&
  + specifier !== 'meta') {
  + // 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 "${specifier}" ` +
  + `in file "${filePath}".`);
  }
  return specifier;
  }
  