Support Prettier v3

[timdp]

Prettier v3.0.0 was released this week. I tried to run prettier-eslint against it, and ran into:

TypeError: Expected `input` to be a `string`, got `object`
    at module.exports (node_modules/@prettier/eslint/node_modules/indent-string/index.js:11:9)
    at prettify (node_modules/@prettier/eslint/dist/index.js:133:37)
    at format (node_modules/@prettier/eslint/dist/index.js:113:20)
    at async node_modules/prettier-eslint-cli/dist/format-files.js:255:26

The indentation happens merely in a logging statement, but commenting it out just propagates the unexpected input to another function. The underlying issue is that prettier.format(), called from prettify(), is now async. Hence, the mysterious object is actually a Promise.

As a quick fix for that particular API change, it's sufficient to treat prettify as async and add an await. It's also called in two other places, but those are a return from an async function, so adding an await would be redundant. (I personally prefer to do it for clarity, but the linter rules won't let me.)

This is only a fix for this particular incompatibility. It does not:

• upgrade prettier to v3.0.0: I tried, but then, the tests crash;
• take into account other API changes: no idea if there are any.

However, it makes formatting work in my projects, and it's backwards compatible with v2, because you can safely await a string. Hence, it should at least be a step in the right direction.

(Incidentally, only calling indentString if the logger is actually enabled would probably provide a nice performance boost.)

[changeset-bot]

🦋 Changeset detected

Latest commit: 6780f52

The changes in this PR will be included in the next version bump.

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[Kreeg]

When this will be merged?

[timdp]

For those wanting to experiment with this, I've published:

• @timdp/prettier-eslint-cli@7.1.1-alpha.1
• @timdp/prettier-eslint@^15.0.2-alpha.1

I was able to use the former as a drop-in replacement for the real prettier-eslint-cli while depending on prettier@3.0.0, but YMMV.

[JounQin]

upgrade prettier to v3.0.0: I tried, but then, the tests crash;

It seems this PR can not be merged as-is?

[timdp]

It seems this PR can not be merged as-is?

In the original PR, the logger was crashing. I didn't notice because I'd commented it out locally. I added an extra await and force-pushed 718e5f0. That one works for me; it's also the version I published under my npm scope.

[JounQin]

@timdp

prettier-eslint/package.json

Line 32 in 1c0bdbf

"prettier": "^2.5.1",

But the prettier version in package.json does not change at all?

[timdp]

But the prettier version in package.json does not change at all?

My project depends on prettier@3.0.0 directly, and this package contains complex logic that makes it prefer that over its own version.

As I mentioned in the issue description, upgrading the dependency makes the tests crash for an unknown reason:

node:internal/process/promises:289
            triggerUncaughtException(err, true /* fromPromise */);
            ^

TypeError: A dynamic import callback was not specified.
    at new NodeError (node:internal/errors:405:5)
    at importModuleDynamicallyCallback (node:internal/modules/esm/utils:91:9)
    at Object.<anonymous> (/Users/timdp/Code/prettier-eslint/node_modules/prettier/index.cjs:600:23)
    at Runtime._execModule (/Users/timdp/Code/prettier-eslint/node_modules/jest-runtime/build/index.js:1205:24)
    at Runtime._loadModule (/Users/timdp/Code/prettier-eslint/node_modules/jest-runtime/build/index.js:805:12)
    at Runtime.requireModule (/Users/timdp/Code/prettier-eslint/node_modules/jest-runtime/build/index.js:662:10)
    at Runtime.requireActual (/Users/timdp/Code/prettier-eslint/node_modules/jest-runtime/build/index.js:683:17)
    at Object.<anonymous> (/Users/timdp/Code/prettier-eslint/src/__mocks__/prettier.js:1:23)
    at Runtime._execModule (/Users/timdp/Code/prettier-eslint/node_modules/jest-runtime/build/index.js:1205:24)
    at Runtime._loadModule (/Users/timdp/Code/prettier-eslint/node_modules/jest-runtime/build/index.js:805:12) {
  code: 'ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING'
}

Node.js v20.5.0

Jest gives me nightmares but I can do some more digging if the error doesn't ring a bell.

[seanCodes]

@timdp @JounQin I've submitted a PR to Tim’s prettier-3 branch (timdp#1) that fixes the tests and includes the prettier 3 bump. Once it’s merged this PR should be good to go.

On a side note, it might be good to make prettier a peer dependency rather than a direct dependency. The prettier-eslint code actually supports prettier 2 and 3, so it could be nice for consumers to have the option to choose.

[seanCodes]

@JounQin This change should now be ready for review 🙂

[mbergkvist]

Any ideas when this will merged and released?

[seanCodes]

@JounQin @danielwerg Bumping this. This issue makes the eslint-prettier plugin for VSCode useless with Prettier v3, so it's impacting productivity quite a bit. Is anything else blocking release?

[mrmarbury]

Please merge this

[monarchwadia]

Just wanted to ask... When will this be merged?
Thank you for the great work you're doing for the community.

[JounQin]

Sorry for the delay, v16 has just been released! Before prettier-eslint-cli upgrade, you can install prettier-eslint@v16 manually with prettier-eslint-cli together, because prettier-eslint is an optional peer dependency for prettier-eslint-cli.

[JounQin]

prettier-eslint-cli@8.0.0 has just been released!