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(fix) Bug when extending styles (#218) #220

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7 changes: 4 additions & 3 deletions src/core/hash.js
Original file line number Diff line number Diff line change
Expand Up @@ -29,11 +29,11 @@ let stringify = (data) => {
* @param {String|Object} compiled
* @param {Object} sheet StyleSheet target
* @param {Object} global Global flag
* @param {Boolean} append Append or not
* @param {Boolean} before To insert style before an other style
* @param {Boolean} keyframes Keyframes mode. The input is the keyframes body that needs to be wrapped.
* @returns {String}
*/
export let hash = (compiled, sheet, global, append, keyframes) => {
export let hash = (compiled, sheet, global, before, keyframes) => {
// Get a string representation of the object or the value that is called 'compiled'
let stringifiedCompiled = typeof compiled == 'object' ? stringify(compiled) : compiled;

Expand All @@ -55,7 +55,8 @@ export let hash = (compiled, sheet, global, append, keyframes) => {
}

// add or update
update(cache[className], sheet, append);
//"/*" + className + "*/" is a marker to insert styles before .className
update('/*' + className + '*/' + cache[className], sheet, before);

// return hash
return className;
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7 changes: 5 additions & 2 deletions src/core/update.js
Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,9 @@ export let extractCss = (target) => {
* @param {Object} sheet
* @param {Boolean} append
*/
export let update = (css, sheet, append) => {
sheet.data.indexOf(css) == -1 && (sheet.data = append ? css + sheet.data : sheet.data + css);
export let update = (css, sheet, before) => {
sheet.data.indexOf(css) == -1 &&
(sheet.data = before
? sheet.data.replace('/*' + before[0] + '*/', css + '/*' + before[0] + '*/')
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Alrighty, couldn't find time to look into it properly, but now I did. You did an excellent job in here! 😄 really love it!

Do you think we could actually use the bellow instead of adding a comment? 🤔

Suggested change
? sheet.data.replace('/*' + before[0] + '*/', css + '/*' + before[0] + '*/')
? sheet.data.replace('.' + before[0], css + '.' + before[0])

If we do the above, the changes to hash.js are not needed, and that makes the size hit around +10B which is really awesome to fix this bug! 🎉

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Thanks for taking a look at this.
Well in some cases (like media queries) I think there might be some issues with your suggestion.
Like in this case

const RedBase = styled('div')`
  @media (max-width: 1245px) {
    color: #FF2222;
  }
  @media (max-width: 800px) {
    color: #FF4444;
  }
`;

In that case if you try to use sheet.data.replace('.' + before[0], css + '.' + before[0]) it would be a problem:

@media (max-width: 12450px) {
    /* THE NEW STYLE WOULD BE INSERTED HERE CAUSING A BUG */
    .go2087537148{color:#FF2222;}
}
@media (max-width: 800px) {
    .go2087537148{color:#FF2222;}
}

But adding comments before every style definitely feels hacky...
There's probably a better solution, it might be interesting to look at how styled-components or emotion handle this problem.

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Oh did not thought about media queries. Can you make me understand why that would bug out?

Tried it with the changes in this codesandbox https://codesandbox.io/s/vanilla-forked-wprg1?file=/src/index.js:247-390 and to my untrained eye, looks fine? 🤔

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@atersolis atersolis Jan 9, 2021

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oh indeed my example did not work

I forked your codesandbox : https://codesandbox.io/s/vanilla-forked-h06f6?file=/src/index.js
You can see here that RedBase is black instead of red, because the class for red is inserted inside the first media-query for the orange style.

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@cristianbote cristianbote Jan 12, 2021

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Uh oh! Indeed!

So, that's happening because there are no other styles outside the media queries. Do you see this as an established pattern? To have a component solely based on media queries? 🤔

This works with the above

const Orange = styled(RedBase)`
  font-weight: normal;

  @media (min-width: 20000px) {
    color: orange;
  }
  @media (min-width: 2px) {
    color: orange;
  }
`;

: sheet.data + css);
};
2 changes: 1 addition & 1 deletion src/styled.js
Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ function styled(tag, forwardRef) {
// Set a flag if the current components had a previous className
// similar to goober. This is the append/prepend flag
// The _empty_ space compresses better than `\s`
_ctx.o = / *go\d+/g.test(_previousClassName);
_ctx.o = (_previousClassName || '').match(/ *go\d+/g);
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This one adds +0B 😄


_props.className =
// Define the new className
Expand Down