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Michał Zagojski

TypeError: Cannot read properties of undefined (reading 'utils')

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Hi,

I have recently downloaded a ZIP file containing bonus plugins, and installed it according to your installation guide. I put gsap-bonus.tgz file into the main folder and ran npm install --save-dev ./gsap-bonus.tgz. I import gsap and necessary plugins and register them in my Scroll.ts file, which is responsible for scrolling effects. When I compile the code, I get the error: image.png.9a12b31dc16eb3a84001ddf5183ba0cb.pngimage.png.5557e61f5d852b40aad87608d31c24dc.png

I logged the gsap object in Observer.js and it turned out to be undefined. What am I doing wrong?

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Hi @Michał Zagojski

 

If gsap is undefined you're not importing it correctly. It's impossible to say what the issue from a screenshot.

 

And how did you get the bonus plugins? I don't see a membership attached to your name? If you just to test drive the plugins, you can use gsap-trial.

https://www.npmjs.com/package/gsap-trial

 

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  • 1 month later...

Hello,

 

I had the same issue and looking for a solution i found this thread.

 

I found a work around that worked for the project, this might not work for everyone, the issue for me was that i was trying to initialize ScrollSmoother before the 'load' event which makes me think you need to initialized it after or in an event handler for the 'load' event.

 

See the Pen VwQqgqx by d0tb0x (@d0tb0x) on CodePen

 

Fixed

See the Pen qBxLvYQ by d0tb0x (@d0tb0x) on CodePen

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1 hour ago, dotmot said:

I found a work around that worked for the project, this might not work for everyone, the issue for me was that i was trying to initialize ScrollSmoother before the 'load' event which makes me think you need to initialized it after or in an event handler for the 'load' event.

It actually doesn't need to wait for the "load" event - the problem in your demo was that you put your <script> in the <head> and you were running it immediately, BEFORE the <body> was parsed by the browser at all. So you were trying to reference the "#smooth-content" and "#smooth-wrapper" elements before they even existed. You should never try to reference things (like animate them or apply smooth scrolling) before they exist. 

 

So the solutions would be (choose any):

  1. Just move your <script> to the bottom of the <body> so that by the time it parses and executes that code, the elements it references exist. 
  2. -OR- wrap your code in a "load" or "DOMContentLoaded" event handler so that it waits until things are parsed. 

(or both) :)

 

Thanks for posting about what worked for you. I just wanted to offer some clarity. 

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13 hours ago, GreenSock said:

It actually doesn't need to wait for the "load" event - the problem in your demo was that you put your <script> in the <head> and you were running it immediately, BEFORE the <body> was parsed by the browser at all. So you were trying to reference the "#smooth-content" and "#smooth-wrapper" elements before they even existed. You should never try to reference things (like animate them or apply smooth scrolling) before they exist. 

 

So the solutions would be (choose any):

  1. Just move your <script> to the bottom of the <body> so that by the time it parses and executes that code, the elements it references exist. 
  2. -OR- wrap your code in a "load" or "DOMContentLoaded" event handler so that it waits until things are parsed. 

(or both) :)

 

Thanks for posting about what worked for you. I just wanted to offer some clarity. 

 

 

Thanks for the clarity,
Was looking for this answer when came up with this thread and since there was none before...

having this response in the thread is helpful. thanks.

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