code: function requestPosts( siteId, query = {} ) {
  	return dispatch => {
  		dispatch( {
  			type: POSTS_REQUEST,
  			siteId,
  			query,
  		} );
  
  		const source = siteId ? wpcom.site( siteId ) : wpcom.me();
  
  		return source
  			.postsList( { ...query } )
  			.then( ( { found, posts } ) => {
  				dispatch( receivePosts( posts ) );
  				dispatch( {
  					type: POSTS_REQUEST_SUCCESS,
  					siteId,
  					query,
  					found,
  					posts,
  				} );
  			} )
  			.catch( error => {
  				dispatch( {
  					type: POSTS_REQUEST_FAILURE,
  					siteId,
  					query,
  					error,
  				} );
  			} );
  	};
  }
docs: Triggers a network request to fetch posts for the specified site and query.
  
  @param  {?Number}  siteId Site ID
  @param  {String}   query  Post query
  @return {Function}        Action thunk