How to fix problem when uglifyjs and jsasync libs in js output

1

Hi,

I use for minifying js https://lib.haxe.org/p/uglifyjs/ which is pretty good until I used in my JS app https://lib.haxe.org/p/jsasync/ library.

At minifying my js output i got this error:

Parse error at ../project/main.js:146,34
AsyncAwait.fetchURLAsText = async function(url,data) {
                                  ^
ERROR: Unexpected token: keyword «function», expected: punc «;»
    at JS_Parse_Error.get (eval at <anonymous> (/usr/local/lib/node_modules/uglify-js/tools/node.js:18:1), <anonymous>:71:23)
    at fatal (/usr/local/lib/node_modules/uglify-js/bin/uglifyjs:394:27)
    at run (/usr/local/lib/node_modules/uglify-js/bin/uglifyjs:343:9)
    at Object.<anonymous> (/usr/local/lib/node_modules/uglify-js/bin/uglifyjs:259:5)
    at Module._compile (node:internal/modules/cjs/loader:1119:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1173:10)
    at Module.load (node:internal/modules/cjs/loader:997:32)
    at Module._load (node:internal/modules/cjs/loader:838:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:18:47

Code works fine without minifying.

Did you already meet with the same problem and what do you recommend to fix it, please?

2

UglifyJS used to be pretty popular in the JS ecosystem, but a lot of new JS syntax (such as async) is not supported by it. In the JS ecosystem, UglifyJS was forked and became Terser.

There isn’t a Haxe library specifically for Terser. However, looking at the README for hx-uglifyjs, I see a section titled Using Terser as alternative of Uglify. You should read through that and give it a try. I’m guessing that you’ll have better luck using hx-uglifyjs with Terser.

2 Likes
3

Thank you for it. I will check it.