Related to 11ty/eleventy-plugin-rss#42. Maybe we can adopt a consistent prettier configuration across the 11ty repos?

eleventy-plugin-syntaxhighlight and eleventy-plugin-rss use this EditorConfig:

root = true

[*]
indent_style = space
indent_size = 2
end_of_line = lf
insert_final_newline = true
trim_trailing_whitespace = true
charset = utf-8

2 space indentation with final newline.

eleventy-base-blog uses the same config except for the indent_style (uses tabs):

root = true

[*]
indent_style = tab
indent_size = 2
end_of_line = lf
insert_final_newline = true
trim_trailing_whitespace = true
charset = utf-8

eleventy-img goes back to the eleventy-plugin-syntaxhighlight/eleventy-plugin-rss config (which uses spaces) except for this weird insert_final_newline rule:

root = true

[*]
indent_style = space
indent_size = 2
end_of_line = lf
insert_final_newline = false
trim_trailing_whitespace = true
charset = utf-8

[*.js]
insert_final_newline = true

eleventy uses a similar config to eleventy-img:

root = true

[*]
indent_style = space
indent_size = 2
end_of_line = lf
insert_final_newline = false
trim_trailing_whitespace = true
charset = utf-8

[*.js]
insert_final_newline = true

[/test/stubs*/**]
insert_final_newline = unset
trim_trailing_whitespace = false

and this website itself uses tabs + the weird newline rule:

root = true

[*]
indent_style = tab
indent_size = 2
end_of_line = lf
insert_final_newline = false
trim_trailing_whitespace = true
charset = utf-8

[*.js]
insert_final_newline = true
indent_style = tab

[*.json]
indent_style = tab

[*.css]
insert_final_newline = true
indent_style = tab

And the only actual prettier configuration is this, just specifying arrowParens and the printWidth:

{
  "arrowParens": "always",
  "printWidth": 100
}

Looks like we can't decide between tabs and spaces but the indent_size should be 2?

For the most part we can stick to using EditorConfig since prettier respects that (for rules like indent_style, indent_size/tab_width, the other basics) but we should think about these prettier-specific rules:

semi: use semicolons at the end of lines
trailingComma: add trailing commas "wherever possible in multi-line comma-separated syntactic structures" (better for diffs)
singleQuote: use single quotes instead of double quotes

Would love an update on this. Hoping to contribute but lacking this config makes it difficult!