Added gulp buildscript

Author: marcus-alsterfjord-visma

gulpfile.js

@@ -0,0 +1,37 @@
+var gulp = require('gulp');
+var uglify = require('gulp-uglify');
+var pump = require('pump');
+var rename = require('gulp-rename');
+var del = require('del');
+var bump = require('gulp-bump');
+
+gulp.task('clean', function () {
+    return del([
+        'dist/',
+    ]);
+});
+
+gulp.task('compress', function (cb) {
+    pump([
+            gulp.src('src/*.js'),
+            uglify(),
+            rename('chartjs-plugin-trendline.min.js'),
+            gulp.dest('dist/')
+        ],
+        cb
+        );
+});
+
+gulp.task('bump-minor', function(){
+    return gulp.src(['./package.json', './src/chartjs-plugin-trendline.js'], {base: './'})
+    .pipe(bump({type:'minor'}))
+    .pipe(gulp.dest('./'));
+});
+
+gulp.task('bump-patch', function(){
+    return gulp.src(['./package.json', './src/chartjs-plugin-trendline.js'], {base: './'})
+    .pipe(bump({type:'patch'}))
+    .pipe(gulp.dest('./'));
+});
+
+gulp.task('default', gulp.series('clean', 'compress'));

package.json

@@ -4,7 +4,7 @@
   "description": "Trendline for Chart.js",
   "main": "src/chartjs-plugin-trendline.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "build": "gulp"
   },
   "repository": {
     "type": "git",
@@ -15,5 +15,13 @@
   "bugs": {
     "url": "https://github.com/Makanz/chartjs-plugin-trendline/issues"
   },
-  "homepage": "https://github.com/Makanz/chartjs-plugin-trendline#readme"
+  "homepage": "https://github.com/Makanz/chartjs-plugin-trendline#readme",
+  "devDependencies": {
+    "del": "^3.0.0",
+    "gulp": "^4.0.0",
+    "gulp-bump": "^3.1.3",
+    "gulp-rename": "^1.4.0",
+    "gulp-uglify": "^3.0.1",
+    "pump": "^3.0.0"
+  }
 }