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feat(rome_js_formatter): Heuristic for fill arrays #3126
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This was referenced Aug 29, 2022
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Parser conformance results on ubuntu-latestjs/262
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crates/rome_js_formatter/src/js/expressions/array_expression.rs
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| "TG", "TH", "TJ", "TK", "TL", "TM", "TN", "TO", "TR", "TT", "TV", "TW", | ||
| "TZ", "UA", "UG", "US", "UY", "UZ", "VA", "VC", "VE", "VG", "VN", "VU", | ||
| "WF", "WS", "XK", "YE", "YT", "ZA", "ZM", "ZW", "ZZ", | ||
| "AC", |
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Personal thought: isn't it weird arrays of numbers fill the array, while the array of string literals does not? I suppose prettier has their reasons for doing so
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I considered keeping that special handling for string arrays as it isn't too hard for us to do it but then decided against it, simply to optimize for compatibility for now. I think this is something that we can consider adding again in the future.
Align Rome's heuristic with Prettier's of when use `fill` vs a group. There's one difference that I intend not to fix because I believe it is a bug in Prettier. Rome's printer automatically inserts a `group` around `fill` elements so that `fits` returns `false` if it encounters any hard line break. Prettier doesn't do so and any hard line break will result in `fits` return true. This difference is meaningful for ```javascript [ // comment2 -380014, -253951682 ] ``` where the first element contains hard line breaks because of the `//comment`. Prettier assumes that the content fits and, thus, prints `-253...` on the same line. Rome does not and istead, prints a line break after `-3800..`. I can demonstrate that this leads to issues where Prettier incorrectly exceeds the line widths: [example](https://prettier.io/playground/#N4Igxg9gdgLgprEAuEBtAOlA9FgBJAWwIRgCZMBaAZgA4AGOgRgBYq32POvufe-+ANJVIBWKgE4RjAGw1yUXLgC6mEAJAQADjACW0AM7JQAQwBOpiAHcACmYSGUxgDaXjAT0PqARqeNgA1nAwAMrGxAAyOlBwyABmzvpw3r4BQcGaflEA5sgwpgCuSSBwBF5wACblFeHGUFn5xllwAGIQpgTGMLp1yCDG+TAQaiAAFjAETgDqIzrw+hlgcMH2szoAbrNuvWD6niBRiaYw1r5ZHXEJRQBW+gAewdlOcACK+RDwF06J6hmmh70wNyaOD6MCmHTaYaacGwSY6cowEbIeg-CyJSa+TS9aEguCmNYxdQARze8BOWgcIBxhwJw1McBJOnpJ0a5yQ8S+RUSBB0uQKXMeL1JMXZl3UMGMXjhCKRSFI4t8Oic2QAwhAiMZes4nMN8okACqShwc74gNaFACSUCqsGCYIhMAAgtbgoCnp9EgBfT1AA) ```javascript [ // comment2 -380014333333333333333333333333333333333333333333333333333333333333333333, -253951682 ] ```
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Co-authored-by: Emanuele Stoppa <my.burning@gmail.com>
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feat(rome_js_formatter): Heuristic for flat arrays
Align Rome's heuristic with Prettier's of when use
fillvs a group.There's one difference that I intend not to fix because I believe it is a bug in Prettier.
Rome's printer automatically inserts a
grouparoundfillelements so thatfitsreturnsfalseif it encounters any hard line break.Prettier doesn't do so and any hard line break will result in
fitsreturn true.This difference is meaningful for
where the first element contains hard line breaks because of the
//comment. Prettier assumes that the content fits and, thus, prints-253...on the same line. Rome does not and istead, prints a line break after-3800...I can demonstrate that this leads to issues where Prettier incorrectly exceeds the line width: example
Tests
Average compatibility: 83.70 -> 84.00
Compatible lines: 80.79 -> 81.75