How to "merge" a bunch of js files into one?

Question

JavaScript

Hello. The number of js libraries exceeded the sane number and began to really slow down the loading of the site. I tried to combine it with my hands, but nothing good comes of it - errors come up.
How is it done correctly?

Answer 1

Google Closure Compiler

Answer 2

cat 1.js 2.js 3.js > all.js
or in Makefile:

src/all.js: $(wildcard src/*.js)
    cat $^ > [email protected]

you can also clamp it with uglifyjs:

UGLIFY = uglifyjs
...
src/all.js: $(wildcard src/*.js)
    cat $^ | $(UGLIFY) -cmo [email protected]

Answer 3

UglifyJS .
-c = compress, compression
-m = mangle, "mangle" names of variables and functions.
-o = output file name

uglifyjs jquery.js bootstrap.js mylib.js myapp.js -c -m -o compiled.js