How to use the @embroider/core.warn function in @embroider/core

dependenciesOf(moduleName: string): ResolvedDep[] {
    let flatDeps: Map = new Map();
    let deps = this.dependencies.get(moduleName);
    if (deps) {
      for (let dep of deps) {
        if (dep.type === 'error') {
          if (dep.hardFail) {
            throw new Error(dep.message);
          } else {
            warn(dep.message);
          }
        } else {
          for (let entry of dep.modules) {
            let { runtimeName } = entry;
            flatDeps.set(runtimeName, entry);
          }
        }
      }
    }
    return [...flatDeps.values()];
  }