Cannot read property 'add' of undefined #974

mblout · 2020-01-17T21:41:52Z

seeing " Cannot read property 'add' of undefined" with the latest

sample code, junk.js

const y = () => {};
function x(foo = y) {}

command: npx babel junk.js --presets=minify

package.json

{
  "name": "babelbug",
  "version": "1.0.0",
  "description": "",
  "devDependencies": {
    "@babel/core": "^7.7.0",
    "@babel/preset-env": "^7.7.0",
    "@babel/cli": "^7.7.0",
    "babel-preset-minify": "~0.5.0"
  }
}

stack

{ TypeError: C:\babelbug\junk.js: Cannot read property 'add' of undefined
    at ScopeTracker.addReference (C:\babelbug\node_modules\babel-plugin-minify-mangle-names\lib\scope-tracker.js:47:34)
    at ReferencedIdentifier (C:\babelbug\node_modules\babel-plugin-minify-mangle-names\lib\index.js:196:26)
    at newFn (C:\babelbug\node_modules\@babel\traverse\lib\visitors.js:220:17)
    at bfsTraverse (C:\babelbug\node_modules\babel-plugin-minify-mangle-names\lib\bfs-traverse.js:32:43)
    at Mangler.collect (C:\babelbug\node_modules\babel-plugin-minify-mangle-names\lib\index.js:229:7)
    at Mangler.run (C:\babelbug\node_modules\babel-plugin-minify-mangle-names\lib\index.js:54:12)
    at PluginPass.exit (C:\babelbug\node_modules\babel-plugin-minify-mangle-names\lib\index.js:558:19)
    at newFn (C:\babelbug\node_modules\@babel\traverse\lib\visitors.js:179:21)
    at NodePath._call (C:\babelbug\node_modules\@babel\traverse\lib\path\context.js:55:20)
    at NodePath.call (C:\babelbug\node_modules\@babel\traverse\lib\path\context.js:42:17) code: 'BABEL_TRANSFORM_ERROR' }

The text was updated successfully, but these errors were encountered:

anthony-quiros · 2020-01-20T11:40:53Z

I have the same error with this code:

  const defaultLib = require('./default-lib');

  foo(lib = defaultLib) {
    this.lib = lib;
  }

mjakobis · 2020-01-21T14:57:37Z

The issue seems to be with default functional parameters set to a constant.

arantes555 · 2020-02-05T14:48:33Z

Seeing the same problem here... setting mangle: false in the options seems to work-around the problem.

arantes555 · 2020-02-05T16:50:19Z

Also, seems there is a similar old issue : #556

somewhatabstract · 2020-02-17T23:16:13Z

I see the same issue when using rollup-babel-minify. Dependabot tried to update to latest babel and couldn't due to this issue.

TypeError: unknown: Cannot read property 'add' of undefined
    at ScopeTracker.addReference (/Users/jeffyates/git/checksync/node_modules/babel-plugin-minify-mangle-names/lib/scope-tracker.js:47:34)
    at ReferencedIdentifier (/Users/jeffyates/git/checksync/node_modules/babel-plugin-minify-mangle-names/lib/index.js:196:26)
    at newFn (/Users/jeffyates/git/checksync/node_modules/@babel/traverse/lib/visitors.js:220:17)
    at bfsTraverse (/Users/jeffyates/git/checksync/node_modules/babel-plugin-minify-mangle-names/lib/bfs-traverse.js:32:43)
    at Mangler.collect (/Users/jeffyates/git/checksync/node_modules/babel-plugin-minify-mangle-names/lib/index.js:229:7)
    at Mangler.run (/Users/jeffyates/git/checksync/node_modules/babel-plugin-minify-mangle-names/lib/index.js:54:12)
    at PluginPass.exit (/Users/jeffyates/git/checksync/node_modules/babel-plugin-minify-mangle-names/lib/index.js:558:19)
    at newFn (/Users/jeffyates/git/checksync/node_modules/@babel/traverse/lib/visitors.js:179:21)
    at NodePath._call (/Users/jeffyates/git/checksync/node_modules/@babel/traverse/lib/path/context.js:55:20)
    at NodePath.call (/Users/jeffyates/git/checksync/node_modules/@babel/traverse/lib/path/context.js:42:17)

SalvatorePreviti · 2020-02-20T11:32:25Z

Same issue here.

mnosuk · 2020-02-26T10:29:59Z

same issue here :(

DiegoRBaquero · 2020-04-01T21:05:05Z

Same issue here to build webtorrent

kpierro914 · 2020-05-19T14:16:02Z

I'm having the same issue when I'm assigning a default value to a parameter. As soon as I remove the default value, the issue is gone.

monokee · 2020-06-16T10:57:07Z

Same issue

arantes555 · 2020-06-16T12:47:04Z

I have noticed a weird behaviour :

I have @babel/core@7.5.5, and I do not hit this issue
If I update @babel/core to any superior version, I start hitting the issue
If I then rollback @babel/core to 7.5.5, I still hit the issue.

I think this means the issue is caused by one of @babel/core's dependencies. Not sure how to pinpoint which one :/

DeividVeloso · 2020-08-25T21:02:38Z

Same issue here.

alfokaha-taima · 2020-11-10T14:44:05Z

same issue :(

meduzen · 2020-11-14T21:47:54Z

The issue seems to be with default functional parameters set to a constant.

Same for me on both babel-preset-minify 0.4.3 and 0.5.1.

This doesn’t compile:

import { doc } from '../utils/Document';

const DEFAULT_DEBOUNCE_DELAY = 100

let resizeTimer = null

export default function debounceResize(callback, delay = DEFAULT_DEBOUNCE_DELAY) {
  clearTimeout(resizeTimer)
  doc.classList.add('resizing')

  resizeTimer = setTimeout(() => {
    doc.classList.remove('resizing')
    callback()
  }, delay)
}

Stack trace:

Module build failed (from ./node_modules/babel-loader/lib/index.js):
    TypeError: /resources/js/events/resize.js: Cannot read property 'add' of undefined
        at ScopeTracker.addReference (/node_modules/babel-plugin-minify-mangle-names/lib/scope-tracker.js:47:34)
        at ReferencedIdentifier (/node_modules/babel-plugin-minify-mangle-names/lib/index.js:196:26)
        at newFn (/node_modules/@babel/traverse/lib/visitors.js:216:17)
        at bfsTraverse (/node_modules/babel-plugin-minify-mangle-names/lib/bfs-traverse.js:32:43)
        at Mangler.collect (/node_modules/babel-plugin-minify-mangle-names/lib/index.js:229:7)
        at Mangler.run (/node_modules/babel-plugin-minify-mangle-names/lib/index.js:54:12)
        at PluginPass.exit (/node_modules/babel-plugin-minify-mangle-names/lib/index.js:526:19)
        at newFn (/node_modules/@babel/traverse/lib/visitors.js:175:21)
        at NodePath._call (/node_modules/@babel/traverse/lib/path/context.js:55:20)
        at NodePath.call (/node_modules/@babel/traverse/lib/path/context.js:42:17)
        at NodePath.visit (/node_modules/@babel/traverse/lib/path/context.js:101:8)
        at TraversalContext.visitQueue (/node_modules/@babel/traverse/lib/context.js:112:16)
        at TraversalContext.visitSingle (/node_modules/@babel/traverse/lib/context.js:84:19)
        at TraversalContext.visit (/node_modules/@babel/traverse/lib/context.js:140:19)
        at Function.traverse.node (/node_modules/@babel/traverse/lib/index.js:82:17)
        at traverse (/node_modules/@babel/traverse/lib/index.js:64:12)
        at transformFile (/node_modules/@babel/core/lib/transformation/index.js:107:29)
        at transformFile.next (<anonymous>)
        at run (/node_modules/@babel/core/lib/transformation/index.js:35:12)
        at run.next (<anonymous>)
        at Function.transform (/node_modules/@babel/core/lib/transform.js:27:41)
        at transform.next (<anonymous>)
        at step (/node_modules/gensync/index.js:254:32)
        at /node_modules/gensync/index.js:266:13
        at async.call.result.err.err (/node_modules/gensync/index.js:216:11)
     @ ./resources/js/events/index.js 1:89-126 1:217-231
     @ ./resources/js/app.js

This compiles properly:

import { doc } from '../utils/Document';

let resizeTimer = null

export default function debounceResize(callback, delay = 100) {
  clearTimeout(resizeTimer)
  doc.classList.add('resizing')

  resizeTimer = setTimeout(() => {
    doc.classList.remove('resizing')
    callback()
  }, delay)
}

arantes555 · 2021-01-28T11:50:09Z

I'm still stuck on @babel/core@7.5.5 because of this. Any way we can help fix this ?

s100 · 2021-02-11T14:03:55Z

I was able to work around this problem by using @babel/plugin-transform-parameters to transpile away the default parameters syntax prior to minification. I would still be interested to see the bug fixed though.

Babel has this bug which appeared after trying to update to the latest version, and remained even after rolling back to an older version. Extremely annoying. babel/minify#974 Add grunt-terser. Remove babel, core-js, lodash, which was used just once in build-popup.js, and react-virtualized, which wasn't used at all. Remove package-lock.json from .gitignore and commit it, to make it easier to track exact package changes.

fwextensions · 2021-03-29T00:43:58Z

I was seeing the same thing as @arantes555, where upgrading to the latest package started causing the issue, but rolling back to the previously working version still produced the bug, even after wiping and reinstalling node_modules. I eventually gave up and switched to terser, which has been working fine.

arantes555 · 2021-03-29T08:56:02Z

@fwextensions I ended up switching to terser too...

For those who, for some reason, cannot switch, the trick in this case is to wipe node_modules, and roll-back both your package.json and pacakge-lock.json, then re-installing.

ruymaster · 2021-04-18T09:24:27Z

I got same error.

Fix #57. Squashed commit of the following: commit d10eca3 Author: John Dunning <fw@johndunning.com> Date: Tue May 4 15:54:50 2021 -0700 Update version to 1.6.1 Update README.md, releases/index.md and the store descriptions to include the new keyboard shortcuts. commit 1852914 Author: John Dunning <fw@johndunning.com> Date: Thu Apr 29 12:39:39 2021 -0700 Add IsLinux constant Use ctrl-alt-W on Linux/ChromeOS for closing a tab in the menu, since ctrl-W is intercepted by the browser. commit 12809d5 Author: John Dunning <fw@johndunning.com> Date: Tue Mar 30 12:09:29 2021 -0700 Update dependencies to the latest commit ce05780 Author: John Dunning <fw@johndunning.com> Date: Mon Mar 29 11:29:26 2021 -0700 Add ctrl-P/N and ctrl-K/J shortcuts for moving up/down Fix error in error-handler.js. :| Let newer key bindings override older ones with the same shortcuts. commit 03a044f Author: John Dunning <fw@johndunning.com> Date: Sun Mar 28 17:27:40 2021 -0700 Switch to using terser instead of babel Babel has this bug which appeared after trying to update to the latest version, and remained even after rolling back to an older version. Extremely annoying. babel/minify#974 Add grunt-terser. Remove babel, core-js, lodash, which was used just once in build-popup.js, and react-virtualized, which wasn't used at all. Remove package-lock.json from .gitignore and commit it, to make it easier to track exact package changes. commit e6efa20 Author: John Dunning <fw@johndunning.com> Date: Sat Mar 27 18:06:55 2021 -0700 Fix build-popup.js Change npm build to run grunt build.

dhlolo · 2022-07-25T07:39:16Z

Any update? Seem there is an PR checked but not merged.

TiagoSilvaPereira · 2023-01-17T20:37:25Z

I was able to work around this problem by using @babel/plugin-transform-parameters to transpile away the default parameters syntax prior to minification. I would still be interested to see the bug fixed though.

Confirming it works with @babel/plugin-transform-parameters Thank you very much @s100

ochodek · 2023-03-10T09:33:45Z

Any update? I found that it started to fail after a change in @babel/types@7.8.0 - babel/babel#10917
Hopefuly #1024 will be merged soon.

jamonholmgren · 2023-12-17T01:41:06Z

@ochodek I used Yarn's built-in yarn patch feature to apply #1024's changes (if you're not using Yarn 3+, you can use patch-package instead). It fixed the issue for me.

draeder mentioned this issue Feb 20, 2021

Opts.torrent chr15m/bugout#39

Merged

sam-gc mentioned this issue Dec 13, 2021

Babel minification impossible: Cannot read property 'add' of undefined firebase/firebase-js-sdk#5814

Closed

This was referenced Mar 15, 2022

minify-mangle-names fail when default parameters are assigned to a variable #1023

Open

fix: mangling variables in default parameters #1024

Open

AutisticShark mentioned this issue Jul 4, 2024

Help with an error nizarmah/auto-minify#28

Open

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Cannot read property 'add' of undefined #974

Cannot read property 'add' of undefined #974

mblout commented Jan 17, 2020 •

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anthony-quiros commented Jan 20, 2020

mjakobis commented Jan 21, 2020

arantes555 commented Feb 5, 2020

arantes555 commented Feb 5, 2020

somewhatabstract commented Feb 17, 2020

SalvatorePreviti commented Feb 20, 2020

mnosuk commented Feb 26, 2020

DiegoRBaquero commented Apr 1, 2020

kpierro914 commented May 19, 2020

monokee commented Jun 16, 2020

arantes555 commented Jun 16, 2020

DeividVeloso commented Aug 25, 2020

alfokaha-taima commented Nov 10, 2020

meduzen commented Nov 14, 2020

arantes555 commented Jan 28, 2021

s100 commented Feb 11, 2021

fwextensions commented Mar 29, 2021

arantes555 commented Mar 29, 2021

ruymaster commented Apr 18, 2021

dhlolo commented Jul 25, 2022

TiagoSilvaPereira commented Jan 17, 2023 •

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ochodek commented Mar 10, 2023 •

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jamonholmgren commented Dec 17, 2023

Cannot read property 'add' of undefined #974

Cannot read property 'add' of undefined #974

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mblout commented Jan 17, 2020 • edited Loading

anthony-quiros commented Jan 20, 2020

mjakobis commented Jan 21, 2020

arantes555 commented Feb 5, 2020

arantes555 commented Feb 5, 2020

somewhatabstract commented Feb 17, 2020

SalvatorePreviti commented Feb 20, 2020

mnosuk commented Feb 26, 2020

DiegoRBaquero commented Apr 1, 2020

kpierro914 commented May 19, 2020

monokee commented Jun 16, 2020

arantes555 commented Jun 16, 2020

DeividVeloso commented Aug 25, 2020

alfokaha-taima commented Nov 10, 2020

meduzen commented Nov 14, 2020

arantes555 commented Jan 28, 2021

s100 commented Feb 11, 2021

fwextensions commented Mar 29, 2021

arantes555 commented Mar 29, 2021

ruymaster commented Apr 18, 2021

dhlolo commented Jul 25, 2022

TiagoSilvaPereira commented Jan 17, 2023 • edited Loading

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jamonholmgren commented Dec 17, 2023

mblout commented Jan 17, 2020 •

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ochodek commented Mar 10, 2023 •

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