in gulpfile.js [13:25]
function build() {
const tsProject = ts.createProject('tsconfig.lib.json');
const tsResult = tsProject.src()
.pipe(tsProject());
return merge([
tsResult.dts
.pipe(gulp.dest(tsProject.config.compilerOptions.outDir)),
tsResult.js
.pipe(gulp.dest(tsProject.config.compilerOptions.outDir))
]);
}