May you create a minimal app, demonstrating the issue?

Easiest way to replicate the issue is to create a new app in the folder with space (in this case test with space), add shakapacker, and execute shakapacker:install task, which will fail:

➜  test with space pwd
/Users/kukicola/Desktop/test with space
➜  test with space rails new . --skip-javascript
       exist  
      create  README.md
      create  Rakefile
      create  .ruby-version
      create  config.ru
      ...

➜  test with space git:(main) ✗ bundle add shakapacker --strict
Fetching gem metadata from https://rubygems.org/..........
Resolving dependencies...
Fetching gem metadata from https://rubygems.org/..........
...

➜  test with space git:(main) ✗ ./bin/rails shakapacker:install
/Users/kukicola/Desktop/test: --> /Users/kukicola/Desktop/test
syntax error, unexpected integer literal, expecting end-of-input

Do you really need to have your app in a directory with such name? This is not considered a good practice to name files or directories with spaces.

@ahangarha please test this and I'll ship 7.0.3 with this. Please update the changelog.

@kukicola
Please rebase your branch on the latest changes on our master branch.

@justin808
Except for Changelog, this PR looks good to me.

@kukicola I don't think you did it in the right way.
If you don't mind, I will bring your commits and create a new PR and fix the changelog.

@justin808 do you have any other consideration?

@ahangarha I merged. You can add another commit and I can release a new version.