3.2 blog post (#15892)

Co-authored-by: Alexander Kachkaev <alexander@kachkaev.ru>
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SUZUKI SosukeandAlexander Kachkaev authored and GitHub committed 2024-01-13 01:28:32 +09:00
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---
author: "Sosuke Suzuki (@sosukesuzuki)"
authorURL: "https://github.com/sosukesuzuki"
title: "Prettier 3.2: Support JSONC and Angular’s ICU expression"
---
This release includes new features such as adding a JSONC parser, adding Angular’s ICU expressions, and many bug fixes.
We are still seeking feedback for the `--experimental-ternaries` option released in Prettier 3.1. Please read [A curious case of the ternaries](https://prettier.io/blog/2023/11/13/curious-ternaries) and respond via the Google Forms link provided.
Additionally, we recommend reading [Prettier's CLI: A Performance Deep Dive](https://prettier.io/blog/2023/11/30/cli-deep-dive) by [Fabio Spampinato](https://github.com/fabiospampinato). This faster CLI is slated to be released as version 4.0.
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If you appreciate Prettier and would like to support our work, please consider sponsoring us directly via [our OpenCollective](https://opencollective.com/prettier) or by sponsoring the projects we depend on, such as [typescript-eslint](https://opencollective.com/typescript-eslint), [remark](https://opencollective.com/unified), and [Babel](https://opencollective.com/babel). Thank you for your continued support!
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---
author: "Sosuke Suzuki (@sosukesuzuki)"
authorURL: "https://github.com/sosukesuzuki"
title: "Prettier 3.2: Support JSONC and Angular’s ICU expression"
---
This release includes new features such as adding a JSONC parser, adding Angular’s ICU expressions, and many bug fixes.
We are still seeking feedback for the `--experimental-ternaries` option released in Prettier 3.1. Please read [A curious case of the ternaries](https://prettier.io/blog/2023/11/13/curious-ternaries) and respond via the Google Forms link provided.
Additionally, we recommend reading [Prettier's CLI: A Performance Deep Dive](https://prettier.io/blog/2023/11/30/cli-deep-dive) by [Fabio Spampinato](https://github.com/fabiospampinato). This faster CLI is slated to be released as version 4.0.
<!-- truncate -->
If you appreciate Prettier and would like to support our work, please consider sponsoring us directly via [our OpenCollective](https://opencollective.com/prettier) or by sponsoring the projects we depend on, such as [typescript-eslint](https://opencollective.com/typescript-eslint), [remark](https://opencollective.com/unified), and [Babel](https://opencollective.com/babel). Thank you for your continued support!
## Highlights
### JSON
#### New `jsonc` parser added ([#15831](https://github.com/prettier/prettier/pull/15831) by [@fisker](https://github.com/fisker))
Previously, we infer the parser of `.jsonc` files to be `json`, but if we want keep the trailing comma, we'll have to use a hacky workaround config `{parser: "json5", quoteProps: "preserve", singleQuote: false}`.
The new added `jsonc` parser:
- Always quote the object keys.
- Wrap strings with double quotes.
- Of course, respect the [`trailingComma`](https://prettier.io/docs/en/options#trailing-commas) option.
### Angular
#### Support formatting for Angular ICU expression ([#15777](https://github.com/prettier/prettier/pull/15777) by [@sosukesuzuki](https://github.com/sosukesuzuki))
Support two kinds of Angular ICU expressions: [`plural`](https://angular.dev/guide/i18n/translation-files#translate-plurals) and [`select`](https://angular.dev/guide/i18n/translation-files#translate-alternate-expressions).
<!-- prettier-ignore -->
```html
<span i18n>
Updated:
{minutes, plural,
=0 {just now}
=1 {one minute ago}
other {{{minutes}} minutes ago}
}
</span>
<span i18n>
The author is {gender, select, male {male} female {female} other {other}}
</span>
```
## Other Changes
### JavaScript
#### Avoid introducing linebreaks in template interpolations ([#15209](https://github.com/prettier/prettier/pull/15209) by [@bakkot](https://github.com/bakkot))
In a template string like
<!-- prettier-ignore -->
```js
`this is a long message which contains an interpolation: ${format(data)} <- like this`;
```
avoid adding a linebreak when formatting the expression unless one is already present or it's unavoidable due to e.g. a nested function. Previously a linebreak could be introduced whenever some interpolation in the template was sufficiently "not simple":
<!-- prettier-ignore -->
```js
`this is a long message which contains an interpolation: ${format(
data,
)} <- like this`;
```
Now it will instead be left alone.
If a linebreak is already present within the `${...}`, format as normal.
#### Fix non-idempotent formatting of method chain with empty line ([#15522](https://github.com/prettier/prettier/pull/15522) by [@seiyab](https://github.com/seiyab))
<!-- prettier-ignore -->
```js
// Input
Foo.a()
.b();
// Prettier 3.1 (first format)
Foo.a()
.b();
// Prettier 3.1 (second format)
Foo.a().b();
// Prettier 3.2
Foo.a()
.b();
```
#### Fix formatting of ternary in function call ([#15677](https://github.com/prettier/prettier/pull/15677) by [@fisker](https://github.com/fisker))
<!-- prettier-ignore -->
```jsx
// Input
stopDirectory = await (useCache
? memoizedFindProjectRoot
: findProjectRootWithoutCache)(path.dirname(path.resolve(filePath)));
// Prettier 3.1
stopDirectory = await (useCache
? memoizedFindProjectRoot
: findProjectRootWithoutCache)(path.dirname(path.resolve(filePath)));
// Prettier 3.2
stopDirectory = await (
useCache ? memoizedFindProjectRoot : findProjectRootWithoutCache
)(path.dirname(path.resolve(filePath)));
```
#### Fix inconsistencies for optional-chaining ([#15806](https://github.com/prettier/prettier/pull/15806) by [@fisker](https://github.com/fisker))
Only happens when using `typescript`, `meriyah` or other ESTree parsers except `babel`.
<!-- prettier-ignore -->
```js
// Input
function someFunctionName() {
return isEqual(a.map(([t, _]) => t?.id), b.map(([t, _]) => t?.id));
return isEqual(a?.map(([t, _]) => t?.id), b?.map(([t, _]) => t?.id));
}
theValue = Object.entries(someLongObjectName).filter(
([listingId]) => someListToCompareToHere.includes(listingId),
);
theValue = Object.entries(someLongObjectName).filter(
([listingId]) => someListToCompareToHere?.includes(listingId),
);
// Prettier 3.1
function someFunctionName() {
return isEqual(
a.map(([t, _]) => t?.id),
b.map(([t, _]) => t?.id),
);
return isEqual(a?.map(([t, _]) => t?.id), b?.map(([t, _]) => t?.id));
}
theValue = Object.entries(someLongObjectName).filter(([listingId]) =>
someListToCompareToHere.includes(listingId),
);
theValue = Object.entries(someLongObjectName).filter(
([listingId]) => someListToCompareToHere?.includes(listingId),
);
// Prettier 3.2
function someFunctionName() {
return isEqual(
a.map(([t, _]) => t?.id),
b.map(([t, _]) => t?.id),
);
return isEqual(
a?.map(([t, _]) => t?.id),
b?.map(([t, _]) => t?.id),
);
}
theValue = Object.entries(someLongObjectName).filter(([listingId]) =>
someListToCompareToHere.includes(listingId),
);
theValue = Object.entries(someLongObjectName).filter(([listingId]) =>
someListToCompareToHere?.includes(listingId),
);
```
#### Fix comments in `if` ([#15826](https://github.com/prettier/prettier/pull/15826) by [@fisker](https://github.com/fisker))
<!-- prettier-ignore -->
```js
// Input
if (foo) for (i = 2; i > 0; i--) console.log(i); // comment 1
else bar();
for (;;){
if (foo) continue; // comment 2
else bar();
}
// Prettier 3.1
Error: Comment "comment 2" was not printed. Please report this error!
// Prettier 3.2
if (foo)
for (i = 2; i > 0; i--) console.log(i); // comment 1
else bar();
for (;;) {
if (foo)
continue; // comment 2
else bar();
}
```
### TypeScript
#### Improve conditional type alias layout ([#15811](https://github.com/prettier/prettier/pull/15811) by [@seiyab](https://github.com/seiyab))
<!-- prettier-ignore -->
```ts
// Input
type FallbackFlags<F extends Flags | undefined> =
Equals<NonNullableFlag<F>["flags"], {}> extends true
? Dict<any>
: NonNullableFlag<F>["flags"];
// Prettier 3.1
type FallbackFlags<F extends Flags | undefined> = Equals<
NonNullableFlag<F>["flags"],
{}
> extends true
? Dict<any>
: NonNullableFlag<F>["flags"];
// Prettier 3.2
type FallbackFlags<F extends Flags | undefined> =
Equals<NonNullableFlag<F>["flags"], {}> extends true
? Dict<any>
: NonNullableFlag<F>["flags"];
```
### HTML
#### Fix formatting of prettier-ignored unclosed elements ([#15748](https://github.com/prettier/prettier/pull/15748) by [@fisker](https://github.com/fisker))
<!-- prettier-ignore -->
```html
<!-- Input -->
<!-- prettier-ignore -->
<h1>
Hello <span>world!
<!-- Prettier 3.1 -->
<!-- prettier-ignore -->
<h1>
<!-- Prettier 3.2 -->
<!-- prettier-ignore -->
<h1>
Hello <span>world!
```
### Angular
#### Fix `prettier-ignore`d angular control flow block ([#15827](https://github.com/prettier/prettier/pull/15827) by [@fisker](https://github.com/fisker))
<!-- prettier-ignore -->
```html
<!-- Input -->
<!-- prettier-ignore -->
@if (condition) {
Foo
} @else {
Other
}
<!-- Prettier 3.1 -->
<!-- prettier-ignore -->
@if (condition) {
Foo
}
} @else {
Other
}
<!-- Prettier 3.2 -->
<!-- prettier-ignore -->
@if (condition) {
Foo
}
@else {
Other
}
```
#### Avoid adding colon for `track` in 3rd expression of `for` blocks ([#15887](https://github.com/prettier/prettier/pull/15887) by [@sosukesuzuki](https://github.com/sosukesuzuki))
<!-- prettier-ignore -->
```html
<!-- Input -->
@for (item of items; let i = $index; track block) {}
<!-- Prettier 3.1 -->
@for (item of items; let i = $index; track: block) {}
<!-- Prettier 3.2 -->
@for (item of items; let i = $index; track block) {}
```
### Ember / Handlebars
#### Preserve path literal segments ([#15605](https://github.com/prettier/prettier/pull/15605) by [@maxpowa](https://github.com/maxpowa))
Fixes scenarios where an input handlebars file containing literal segments would be reformatted to unwrap the literal segments, causing syntax errors in the resulting output.
<!-- prettier-ignore -->
```hbs
<!-- Input -->
{{input.[funky<api!response]}}
{{input.[this one has spaces]}}
{{input.[anotherone].[0]}}
<!-- Prettier 3.1 -->
{{input.funky<api!response}}
{{input.this one has spaces}}
{{input.anotherone.0}}
<!-- Prettier 3.2 -->
{{input.[funky<api!response]}}
{{input.[this one has spaces]}}
{{input.anotherone.[0]}}
```
### GraphQL
#### Improve GraphQL union types formatting ([#15870](https://github.com/prettier/prettier/pull/15870) by [@ArchitGajjar](https://github.com/ArchitGajjar))
<!-- prettier-ignore -->
```gql
# Input
union SearchResult = Conference| Festival | Concert | Venue | Conference| Festival | Concert | Venue
# Prettier 3.1
union SearchResult =
Conference
| Festival
| Concert
| Venue
| Conference
| Festival
| Concert
| Venue
# Prettier 3.2
union SearchResult =
| Conference
| Festival
| Concert
| Venue
| Conference
| Festival
| Concert
| Venue
```
### API
#### Support absolute path as plugin in config file ([#15666](https://github.com/prettier/prettier/pull/15666) by [@fisker](https://github.com/fisker))
```js
// prettier.config.cjs
module.exports = {
plugins: [
// posix style
"/path/to/plugin.js",
// Windows style
"D:\\\\path\\to\\plugin.js",
// Use `require.resolve`
require.resolve("my-awesome-prettier-plugin"),
],
};
```
#### Fix `getFileInfo` and `getSupportInfo` type definitions ([#15854](https://github.com/prettier/prettier/pull/15854) by [@auvred](https://github.com/auvred))
```ts
const plugin: Plugin = {};
prettier.getFileInfo("./file.ext", {
plugins: [plugin],
});
prettier.getSupportInfo({ plugins: [plugin], showDeprecated: true });
```
### Miscellaneous
#### Fix false claim in docs that cursorOffset is incompatible with rangeStart/rangeEnd ([#15750](https://github.com/prettier/prettier/pull/15750) by [@ExplodingCabbage](https://github.com/ExplodingCabbage))
The cursorOffset option has in fact been compatible with rangeStart/rangeEnd for over 5 years, thanks to work by @ds300. However, Prettier's documentation (including the CLI `--help` text) continued to claim otherwise, falsely. The documentation is now fixed.