gulpコンパイルエラー

前提・実現したいこと

gulpでコンパイルの設定をしているのですが、
ターミナルで「npx gulp」と打つと下記のエラーが発生しました。
原因のわかる方がいらっしゃいましたらご教示いただきたいです。

発生している問題・エラーメッセージ

Error: watching src/js/**/*.js: watch task has to be a function (optionally generated by using gulp.parallel or gulp.series)
    at Gulp.watch (/Users/mizu/mock/node_modules/gulp/index.js:31:11)
    at /Users/mizu/mock/gulpfile.js:89:10
    at taskWrapper (/Users/mizu/mock/node_modules/undertaker/lib/set-task.js:13:15)
    at bound (node:domain:421:15)
    at runBound (node:domain:432:12)
    at asyncRunner (/Users/mizu/mock/node_modules/async-done/index.js:55:18)
    at processTicksAndRejections (node:internal/process/task_queues:78:11)

該当のソースコード（gulpfile.js）

var gulp = require('gulp');
var browserSync = require('browser-sync').create();
var reload = browserSync.reload;
var plumber = require('gulp-plumber');
var rename = require('gulp-rename');
var sourcemaps = require('gulp-sourcemaps');
var sass = require('gulp-sass');
var csslint = require('gulp-csslint');
var autoPrefixer = require('gulp-autoprefixer');
//if node version is lower than v.0.1.2
require('es6-promise').polyfill();
var cssComb = require('gulp-csscomb');
var cmq = require('gulp-merge-media-queries');
var cleanCss = require('gulp-clean-css');
var uglify = require('gulp-uglify');
var ejs = require('gulp-ejs');
var imageMin = require('gulp-imagemin');
var cache = require('gulp-cache');
gulp.task('sass',function(){
    gulp.src(['src/scss/**/*.sass'])
        .pipe(plumber({
            handleError: function (err) {
                console.log(err);
                this.emit('end');
            }
        }))
        .pipe(sourcemaps.init())
        .pipe(sass({
            includePaths: require('node-neat').includePaths
        }))
        .pipe(autoPrefixer())
        .pipe(cssComb())
        .pipe(cmq({log:true}))
        .pipe(csslint())
        .pipe(csslint.formatter())
        .pipe(gulp.dest('dist/css'))
        .pipe(rename({
            suffix: '.min'
        }))
        .pipe(cleanCss())
        .pipe(sourcemaps.write())
        .pipe(gulp.dest('dist/css'))
        .pipe(reload({stream:true}))
});
gulp.task('js',function(){
    gulp.src(['src/js/**/*.js'])
        .pipe(plumber({
            handleError: function (err) {
                console.log(err);
                this.emit('end');
            }
        }))
        .pipe(gulp.dest('dist/js'))
        .pipe(rename({
            suffix: '.min'
        }))
        .pipe(uglify())
        .pipe(gulp.dest('dist/js'))
        .pipe(reload())
});
gulp.task('ejs',function(){
    gulp.src(['src/ejs/**/*.ejs'])
        .pipe(plumber({
            handleError: function (err) {
                console.log(err);
                this.emit('end');
            }
        }))
        .pipe(ejs())
        .pipe(gulp.dest('src'))
        .pipe(reload())
});
gulp.task('image',function(){
    gulp.src(['src/images/**/*'])
        .pipe(plumber({
            handleError: function (err) {
                console.log(err);
                this.emit('end');
            }
        }))
        .pipe(cache(imageMin()))
        .pipe(gulp.dest('dist/images'))
        .pipe(reload())
});
gulp.task('default',function(){
    browserSync.init({
        server: "./"
    });
    gulp.watch('src/js/**/*.js',['js']);
    gulp.watch('src/scss/**/*.sass',['sass']);
    gulp.watch('src/ejs/**/*.ejs',['ejs']);
    gulp.watch('src/images/**/*',['image']);
});

該当ファイル（paackage.json）

{
  "name": "rikokatsu_mock",
  "version": "1.0.0",
  "description": "",
  "main": "gulpfile.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "high5inc@high5inc.git.backlog.com:/RIKOKATU/rikokatsu_mock.git"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "gulp": "^4.0.2",
        "gulp-plumber": "^1.2.1",
        "gulp-rename": "^2.0.0",
        "gulp-sourcemaps": "^3.0.0",
        "gulp-sass": "^5.0.0",
        "node-neat": "^2.0.0-beta.0",
        "gulp-autoprefixer": "^8.0.0",
        "es6-promise": "^4.2.8",
        "gulp-csscomb": "^3.1.0",
        "gulp-merge-media-queries": "^0.2.1",
        "gulp-csslint": "^1.0.1",
        "gulp-clean-css": "^4.3.0",
        "gulp-uglify": "^3.0.2",
        "gulp-ejs": "^5.1.0",
        "gulp-imagemin": "^7.1.0",
        "gulp-cache": "^1.1.3",
        "browser-sync": "^2.27.7"
  }
}