Sometimes we need to transform the ast to make it easier to print, but it's currently done in the parser (markdown and yaml), which leads the output ast harder to use for external users (custom parser), adding `printer.preprocess` can solve this issue.
And also this way we could move the trailing newline for json from `ast-to-doc.js` to `language-js`.
* don't inline pipeline operator with leading ownline comment
* Add tests for comments surrounded with binary expressions
* Add babylon test for ownlinecomment with pipeline operator
If you have
```js
a = b
```
we used to do
```js
group[a = b]
```
which works most of the time but has the unfortunate side effect that if the left part breaks, we're going to break the `=` as well. So you get
```js
{
a
} = \n
b
```
What this PR does it to add a group
```js
group[a group[= b]]
```
so that if the right hand side fits in one line, it should stay that way.
Note that there's a change with a comment being move but I think that it's fine. If I remember correctly, this test was to make sure that we didn't print invalid code, not that it had to be respected (that comment position is not something we really want to support in the first place).
Fixes#4645
* Hande JSX whitespace separately from fbt whitespace
* Extra test cases
* Further tweak to JSX handling
* Possible improvement of single character text
* More tests
* Pull out separator code
* More tests for fbt
This pull request aims to fix the issue of excessive nesting brought up in the following comment: https://github.com/prettier/prettier/issues/737#issuecomment-392541493
This "fix" is very simple. It adds a new possible way to activate JSX mode for ternary operators. If the first non-conditional parent of the expression is a JSX expression container, then JSX mode gets activated.
This branch also contains a test case for said scenario.
* Add various tests for ts type annotated function properties.
* Improve format when passing ts arrow function with return type
* Add test for case from #2581.
Lucas Duailibe