Gulp-terser not minfying in order

I'm using gulp-terser to minify js files. I have a jquery file and a custom js file. When I try to run the task, the custom js code is at the beginning of the jquery file. I've tried using gulp-order with it, but still no luck. Here's the code i'm using:

gulp.task('build-js', function () {
    return gulp.src(["src/js/jquery.min.js","src/js/zinv.js"])
        .pipe(concat('inv.min.js'))
        .pipe(terser())
        .pipe(gulp.dest('./js'));
});

thanks in advance.

I think you need to switch the position of .pipe(terser()) and .pipe(concat('inv.min.js')) and call the require().

Try this :

var gulp = require('gulp');
var terser = require('gulp-terser');
var concat = require('gulp-concat');

gulp.task('js', function () {
    return gulp.src(["src/js/jquery.min.js","src/js/zinv.js"])
        .pipe(terser())
        .pipe(concat('inv.min.js'))
        .pipe(gulp.dest('js'));
});

gulp.task('default', gulp.series('js'));

And then on your terminal, navigate to the directory where your gulpfile.js is saved and type gulp or gulp js