Could not find a declaration file for module 'gulp'. 'c:/project/node_modules/gulp/index.js' implicitly has an 'any' type

I do not know what's wrong.

*gulpfile.js >> gulp and gulp-util and run-sequence error

consle error message Could not find a declaration file for module 'gulp'. 'c:/project/node_modules/gulp/index.js' implicitly has an 'any' type.

import * as gulp from 'gulp';
import * as util from 'gulp-util';
import * as runSequence from 'run-sequence';

via skj