object-constructor.d.ts

declare interface ObjectConstructor {
  entries<T>(o: { [s: string]: T } | ArrayLike<T>): [string, T][];
  entries(o: {}): [string, any][];
}

propDiff.ts

interface IProps {
  [index: string]: {};
 }
 
public componentWillReceiveProps(nextProps: IProps) {
  propDiff(this.props, nextProps);
}

type PropTuple = [string, Object];
const propDiff = (currentProps: IProps, nextProps: IProps): void {
  const existingProps: Array<PropTuple> = Object.entries(currentProps);
  const added = existingProps.filter(([propName, props]: PropTuple) => {
    if (nextProps[propName] === undefined) { return true; }
    if (nextProps[propName] !== props) {
      // tslint:disable-next-line:no-console
      console.log(`${propName}
        - ${JSON.stringify(props)}
        + ${JSON.stringify(nextProps[propName])}`);
    }
    return false;
  });
  // tslint:disable-next-line:no-console
  added.forEach(([propName, props]: PropTuple) => console.log(`${propName}
      + ${JSON.stringify(props)}`));
}