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Bootstrap JS folder is located in the directory like this. You will use @import statement to use it on your scss file.
bootstrap/
βββ dist/
βββ scss/
βββ js/
βββ bootstrap.bundle.js
βββ bootstrap.bundle.js.map
βββ bootstrap.bundle.min.js
βββ bootstrap.bundle.min.js.map
βββ bootstrap.js
βββ bootstrap.js.map
βββ bootstrap.min.js
βββ bootstrap.min.js.map
Also, make sure you install jQuery and Popper too as these are peer dependencies.
npm install --save jquery popper.js.
Source:stackexchange.com