three.js/src/core/Uniform.d.ts

export class Uniform {
  constructor(value: any);
  /**
   * @deprecated
   */
  constructor(type: string, value: any);
  /**
   * @deprecated
   */
  type: string;
  value: any;
  /**
   * @deprecated Use {@link Object3D#onBeforeRender object.onBeforeRender()} instead.
   */
  dynamic: boolean;
  onUpdateCallback: Function;

  /**
   * @deprecated Use {@link Object3D#onBeforeRender object.onBeforeRender()} instead.
   */
  onUpdate(callback: Function): Uniform;
}