Don't format contents of `javascript_tag` method.

[olbrich]

In normal usage of javascript_tag, the contents of the block are javascript, and not HTML. erb-formatter attempts to format these contents, which can mangle whitespace and make inline scripts hard to read. Something like...

<%= javascript_tag(nonce: true) do %>
// We're setting this directly here to help prevent Flash of Unstyled Content (FOUC).
class Showcase {
  static start() {
    const preference = window.matchMedia("(prefers-color-scheme: dark)").matches
      ? "dark"
      : "light";
    this.colorScheme = localStorage.colorScheme || preference;
  }

  static set colorScheme(value) {
    localStorage.colorScheme = value;
    document.documentElement.classList.toggle("sc-dark", value === "dark");
  }
}

Showcase.start();
<% end %>

becomes

<%= javascript_tag(nonce: true) do %>
// We're setting this directly here to help prevent Flash of Unstyled Content
(FOUC). class Showcase { static start() { const preference =
window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
this.colorScheme = localStorage.colorScheme || preference; } static set
colorScheme(value) { localStorage.colorScheme = value;
document.documentElement.classList.toggle("sc-dark", value === "dark"); } }
Showcase.start();
<% end %>

Note that it mangles the comment and results in malformed code in addition to making it difficult to read.

To complicate things, it is valid to include erb tags within the block. Ideally those tags should still be formatted.

This may apply to other helpers as well.

[elia]

Oh good call, I guess we should have some generic way to tell it to ignore the contents of a block or tag 🤔