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yarn add @symfony/webpack-encore --dev
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yarn add jquery --dev
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yarn add bootstrap@4.0.0-beta.2
Many of Bootstrap 4 components require the use of JavaScript to function. Specifically, they require jQuery, Popper.js, and Bootstrap own JavaScript plugins. jQuery must come first, then Popper.js, and then our JavaScript plugins.
So its necessary to require bootstrap.bundle.js instead of bootstrap.js in your main JS file due to Popper dependency.
require('bootstrap/dist/js/bootstrap.bundle.js');
See the example file