There is an off by one error which made the algorithm not work all the time. In many cases, it actually is the opposite, so whenever you save, it adds/removes that line. I noticed it during the --debug-check run on our codebase but didn't investigate.
Fixes#723
This has come up many times in the past and while going through the fb codebase, there are a few instances where we group array elements logically using empty lines and it's a shame that they are gone.
I've started the discussion around it but I think that it was a mistake. It feels weird to add parenthesis on object values sometimes but not others. I think that it's best to let prettier do its work on staying under 80 columns based on the rules we added.
We inline function definitions but we shouldn't inline new expressions,
835befebf5 introduced both call expressions and new expressions. Call expressions have been removed but looks like new haven't.
This was surprisingly easy to write!
Technically, it doesn't ignore the next line but the next expression or block but I'm guessing that people are already used to `// eslint-disable-next-line` so it's going to be an easier learning curve.
Fixes#120
* Extend ReturnStatement case to better handle comments in argument 🎉.
* Update test.
* Add missing space between return and left parenthese.
* Fix current tests and add new tests.
* Do not break one-liner returns.
* Revert specific test.
* Patch from #683.
In #563 it looked odd that there was no space before `//`, it turns out that we don't automatically go to the new line for dangling comments. I think that we just should no matter what, so this is what this diff does.
Fixes#563
* Inject source text into printAstToDoc function.
* Add getNodeSource helper function.
* Fix Flow drawback with missing DeclareTypeAlias by checking the node source.
* Add new test.
* Fix getNodeSource helper function.
* Revert text injection.
* Refactor DeclareTypeAlias printing.
* Drop expensive getNodeSource helper function 🗑️.
* Refactor declareTypeAlias case in printer.
* Update tests.
* Implement the same logic for DeclareInterface.
* Update the tests.
* Fix missing semicolons and typo.
* Put Flow specific node detection code into own helper function 🚀.
* Refactor isFlowNodeStartingWithDeclare helper function.
* Simplify isFlowNodeStartingWithDeclare helper function.
* Rename test spec.
* Update tests.
When there is a comment right before the first `.`, we want to force break such that the comment is printed on its own line.
Note: this needs to be based on-top of #667 as it always indent the first `.`
Fixes#613
* Add prettier indentation for UnionTypeAnnotation in ObjectTypeAnnotation.
* Update tests accordingly.
* Fix indentation.
* Update a bunch of tests 🚀.
* Switch to a more consistent indentation.
* Fix tests to match new indentation 🚀.
The reason why trailing comments on a line work with commas is because of a special `lineSuffix` document that delays printing the content until a \n is printed. But `lineSuffix` only worked for pure string. By making it work with arbitrary documents we can fix trailing commas with trailing comments.
Fixes#538
Before, we would always concatenate the first `.call()` if the identifier started with a capital letter, but we do want to break if the content of the call doesn't fit in one line.
Fixes#639
Because the group was too high up, the comment would be taken into consideration to determine the size and it would break and add parenthesis. Adding a group where we actually want the ifBreak seems to be passing all the existing tests and fixes this edge case.
Fixes#655
We already preserve blank lines inside of classes but not objects. It's still very common to have objects that represent classes (React.createClass) and having the same behavior there seems like a good idea. It does make the snapshot tests look better!
Fixes#554
I've been trying to come up with a heuristic to stop putting small elements on a new line and I just realized that all the cases I found out only involved a single binary expression. If there's only a single operation, we can just put them on the same line (if it fits) and it's not going to look weird.
We do the same thing for MemberExpression where we only break if there are more than one ".".
Fixes#583Fixes#503
* Do not indent binary expressions inside of if
The reason why the indent has been added is to support the
```js
var x = a ||
b;
```
use case where we need a level of indentation. But inside of a `if` it just looks strange
```js
if (
a ||
b
) {
```
because the parent already indented the first line.
Fixes#567
* Tweak logic to make more explicit
We want to preserve an empty line before the last comment. It is added as a trailing comment of the node and adding the same logic to detect if the next line is empty is working.
Fixes#566
* Remove last trailing line for directives-only files
There are two hardlines that are added that do not need to.
- The first one is when there's an empty line afterwards, we want to remove it. The solution I opted for to fix this one is to trimRight the originalText so that globally it's never going to return yes for the isNextLineEmpty.
- The second one is at the end of Program, but we already printed it inside of the directive itself, so we can just add a condition to make sure it's only printed when there's a body or a comment, but not a directive.
Fixes#527
* Add comment
If you removed it before #561, it would trigger an exception in the globalPreceding branch. But now that we don't have this hack anymore, it works fine.
Fixes#543
Babylon has a two top level nodes: File and Program whereas flow just has Program. This causes two things two happen that prevents comments from being displayed:
1) Because there's a single node, none of following/preceding/enclosing exist. We ran into a TOOD case that we now need to fill. We just need to attach comments to the only node we have: the ast.
2) Both the raw comments and the computed comments are set on the `.comments` field of the object, however, it is being reset after calling `attach`, so we lose the computed comments :( The fix is to use a local variable and delete the comments before calling `attach`.
Since we don't print EmptyStatement, we don't want to attach comments to them. I've tried actually printing the EmptyStatement but it messes up a ton of other things.
I made sure that MemberExpressions where printed correctly but didn't do the same for CallExpression. Now it is! It is a bit less straightforward because the comments for the root CallExpression have already been printed, so we need to extract the first call out.
(This is the last place where we drop comments on the test suite, we can start enabling throwing when comments are dropped!)
* Add parentheses if node is StringLiteral surrounded by ExpressionStatement :tools:.
* Add new test.
* Update tests to run against Babylon, plus no regression case.
* Split actual test and no regression test in two files.
* Disable Flow till facebook/flow#3234 is merged.
The original motivation for this change is trying to fix#560 where the comment was attached to the JSXText node instead of the JSXExpressionContainer because it used the globalPrecedingNode. In general, I don't think that it is very safe to attach a comment to a random node just because it happened to be before.
I tried to delete the globalPrecedingNode codepath and I think that it actually improves the results. I'll add inline comments in the pull request to explain the various changes.
Fixes#560
Davy Duperron