Need help deciphering older version config code

[dbraun-ascendium]

Hi, I'm trying to learn from someone's repo, and they have the .eleventy.js config like this:
module.exports = function (eleventyConfig) { return { dir: { input: "src", output: "dist", }, templateFormats: ["html", "md", "njk"], passthroughFileCopy: true, }; };
It would seem like this is old code and the equivalent would be changing props on the eleventyConfig argument. But what isn't obvious to me is why passthoughFileCopy is being set to true. Would would be the update to this, and what does "true" do?

[pdehaan]

That's kind of interesting...

I've never used that config, but I did find mentions of passthroughFileCopy in older versions of the docs; see https://v0-12-1.11ty.dev/docs/copy/#disabling-passthrough-file-copy. It seems to have been added in Jan 16, 2018 via 9042341:
https://github.com/11ty/eleventy/search?q=passthroughFileCopy&type=commits

Configuration Option Key	Default Option	Valid Options	Command Line Override	Description
passthroughFileCopy	true	true or false	N/A	Files found (that aren’t templates) from white-listed file extensions will pass-through to the output directory. Read more about Pass-through Copy.

The passthroughFileCopy:true seems to be the default value in the older, pre-1.0 configs, like https://github.com/11ty/eleventy/blob/v0.11.x/src/defaultConfig.js#L39; and was initially false briefly but changed to true in 90c43df.

So I'm not sure why you'd need to set it explicitly to true since I assume in most/all cases that would have been default/unnecessary.
And the latest version of the passthrough docs is https://www.11ty.dev/docs/copy/ which shows the latest and greatest way to handle passthrough copying.