core/src/plugin/decorators/dependency.ts

export function DependencyLoad(dep: string): (...args: any[]) => void {
  return (
    target: any,
    propertyKey: string,
    descriptor: PropertyDescriptor,
  ) => {
    const originalMethod = descriptor.value;
    descriptor.value = function(...args: any[]): void {
      const self = this as any;
      self.stream.on(self.name, 'pluginLoaded', (plugin: any) => {
        if (typeof plugin === 'string') {
          return;
        }
        const nameof = plugin.manifest.name;
        if (nameof !== dep) {
          return;
        }
        originalMethod.call(self, plugin);
      });
    };
    // Set the function to be autoexecuted when the plugin is initialized.
    descriptor.value.prototype.__autoexec = 1;
    return descriptor;
  };
}

export function DependencyUnload(dep: string): (...args: any[]) => void {
  return (
    target: any,
    propertyKey: string,
    descriptor: PropertyDescriptor,
  ) => {
    const originalMethod = descriptor.value;
    descriptor.value = function(...args: any[]): void {
      const self = this as any;
      self.stream.on(self.name, 'pluginUnloaded', (plugin: any) => {
        let nameof = plugin;
        if (typeof plugin !== 'string') {
          nameof = plugin.manifest.name;
        }
        if (nameof !== dep) {
          return;
        }
        originalMethod.call(self, plugin);
      });
    };
    descriptor.value.prototype.__autoexec = 1;
    return descriptor;
  };
}