Cannot read properties of undefined (reading 'importKey')

16 Aug 2022

I encounter error like picture when click button which used to connect wallet extension in AWS ubuntu environment : This error appears if open web by using http not https. Establish SSL connection and become https, problem solved !

Slither Error Source "@openzeppelin/contracts/access/Ownable.sol" not found

13 Aug 2022

Run slither command then encounter error like :

Error: Source "@openzeppelin/contracts/access/Ownable.sol" not found: File not found. Searched the following locations: "".

Solution : add some flag behind original command ex.

slither contracts/YOUR_CONTRACT.sol  --solc-remaps @openzeppelin/=$(pwd)/node_modules/@openzeppelin/

Hydration failed because the initial UI does not match what was rendered on the server.

13 Aug 2022

Error: Hydration failed because the initial UI does not match what was rendered on the server.

I encounter this problem after modify my folder location, and I solve this by cleaning the browser cache & to delete .next folder .

RegExp.test returns false, even though it should return true

11 Aug 2022

For example, this is my regular expression :
^\d{4}\/(0?[1-9]|1[012])\/(0?[1-9]|[12][0-9]|3[01])$
It used to check if string is in YYYY-MM-DD form.
I used code as below at first, and found that regexp.test always return false, even thouth it should return true.

  const regexp = new RegExp('^\d{4}\/(0?[1-9]|1[012])\/(0?[1-9]|[12][0-9]|3[01])$')
  console.log(regexp.test(date))

The solution is :

  const regexp = new RegExp(/^\d{4}\/(0?[1-9]|1[012])\/(0?[1-9]|[12][0-9]|3[01])$/)
  return(regexp.test(date))

To replace single quotations(‘) to slash(/) ! Check this website to get more information.

Next.js favison.icon not work