Error: Duplicate parameter 'e' not allowed in function with default parameter values.

[rj-david]

We applied this (v5.1.2) in one of our projects and we started to get errors from safari browsers in production

Error: Duplicate parameter 'e' not allowed in function with default parameter values.

We are reverting back to v4 for now and will do investigations next week. We are still unsure if the error was from our code (incompatible) or the minifier itself.

[paulincai]

@zodern @rj-david got the same in Safari (Mac and IOS). Reverting to standard minifier fixes the problem.

[paulincai]

Might only be a problem for React projects.

• react-is.production.min.js
• Copyright (c) Facebook, Inc. and its affiliates.
• This source code is licensed under the MIT license found in the
• LICENSE file in the root directory of this source tree.
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eo,es,eu,ep,em,ey,ev,eC,ew,eS;er.export({Provider:()=>eo,ReactReduxContext:()=>eu,connect:()=>es,useDispatch:()=>ep,createDispatchHook:()=>em,useSelector:()=>ey,createSelectorHook:()=>ev,useStore:()=>eC,createStoreHook:()=>ew,shallowEqual:()=>eS}),er.link("./components/Provider",{default(et){eo=et}},0),er.link("./components/connect",{default(et){es=et}},1),er.link("./components/Context",{ReactReduxContext(et){eu=et}},2),er.link("./hooks/useDispatch",{useDispatch(et){ep=et},createDispatchHook(et){em=et}},3),er.link("./hooks/useSelector",{useSelector(et){ey=et},createSelectorHook(et){ev=et}},4),er.link("./hooks/useStore",{useStore(et){eC=et},createStoreHook(et){ew=et}},5),er.link("./utils/shallowEqual",{default(et){eS=et}},6),er.link("./types",{"":""},7)},"types.js":function et(){}},node_modules:{"react-is":{"package.json":function et(et,en,er){er.exports={name:"react-is",version:"18.2.0",main:"index.js"}},"index.js":function et(et,en,er){"use strict";er.exports=et("./cjs/react-is.production.min.js")},cjs:{"react-is.production.min.js":function et(et,en,er){/**

• @license React
• react-is.production.min.js
• Copyright (c) Facebook, Inc. and its affiliates.
• This source code is licensed under the MIT license found in the
• LICENSE file in the root directory of this source tree.

[alisnic]

We have the same problem, reverted for now

[zodern]

It seems to be happening in modules.js, which has the code from any files imported from node_modules. I've tried adding the npm packages shown in the code from @paulincai, but wasn't able to reproduce the issue. Would someone be willing to share the code from packages/modules.js from a development build (you can load the app in the browser, and use the /packages/modules.js file it loads)? As long as you don't have any private code in an npm package, there shouldn't be anything sensitive in it.

[paulincai]

Ok @zodern just to reconfirm you want this from a development project that runs with this package ( zodern:standard-minifier-js) or it doesn't matter?

[zodern]

It should be a project that encounters this bug, but whether the app currently uses the minifier doesn't really matter.

[namenotrequired]

I'm having exactly this bug in a project that only uses Blaze, not React. The error comes from the path http://localhost:11111/__cordova/476576cde343b948a68be242440e616ecdb06073.js?meteor_js_resource=true, I've sent it to you @zodern

For me it's not happening on Safari but it is happening in the cordova-based iOS app on the same device 🤔

[zodern]

Several people shared the modules.js, and I've been able to reproduce on LambdaTest with Safari 16.0.0. The issue doesn't happen on my computer with Safari 16.5.1.

[jdgjsag67251]

These feel related:

• variable name caused issue in mac safari and mobile safari mishoo/UglifyJS#5776
• Mangle function name duplicate with the parameter name swc-project/swc#6819
• Duplicated identifier used when mangle is enabled terser/terser#1155

[zodern]

I released version 5.2.0 which updates to the latest swc version. SWC has had many bug fixes in the minifier so it might have fixed this.

[paulincai]

Will give it a try and get back.

[paulincai]

I am able to render the web app in all browsers I tried (Chrome, Mac Safari, IOS, Mac Firefox. All seems ok.

[jdgjsag67251]

We have also updated but we still see the same error as before (on some iOS devices)

[paulincai]

We have also updated but we still see the same error as before (on some iOS devices)

"some" sounds a bit funny. Can you suggest IOS versions or so. We can try various versions in simulators.

[jdgjsag67251]

Sorry, yeah totally. I know it definitely goes wrong on an iPad running version 15.7.9 with Safari 15.6.6

[paulincai]

@jdgjsag67251 maybe related to this: meteor/meteor#12838

[jdgjsag67251]

@paulincai, hmm, maybe. But that has been an issue in Meteor for some time and this issue only started recently. But even if it is only the legacy bundle, It should still work when using this package, right?

[rpong]

We experienced the same error in 5.2.0.

There were several instances of the error, this is one of them:

``

[zodern]

This should be fixed in version 5.3.0. I'm no longer able to reproduce after enabling swc's compress.unused option.