chore: add pettier #949

theVedanta · 2025-12-24T23:38:30Z

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domoritz

At the moment, we don't use prettier.

To add this we would need to

make prettier a dev dependency
add prettier support to eslint
ignore schema files

We should make sure that there are no degredations after we add prettier.

domoritz · 2026-01-07T02:24:06Z

.prettierrc.json

+{
+  "singleQuote": true,
+  "tabWidth": 2,
+  "trailingComma": "none"


I think we want a print width of 120

theVedanta · 2026-01-07T02:51:09Z

At the moment, we don't use prettier.

To add this we would need to

make prettier a dev dependency

add prettier support to eslint

ignore schema files

We should make sure that there are no degredations after we add prettier.

Addressed these. Hope I added all the necessary schema files in prettierignore

Also added printWidth

domoritz · 2026-01-07T03:01:54Z

Do we need a prettierignore? Doesn't eslint do that? Or is that for editors with auto formatter?

theVedanta · 2026-01-07T03:08:12Z

I think we might need prettierignore for running it in the terminal, or for the editor's format_on_save, I couldn't find an eslint config option for the same. Sorry if I'm missing something (?)

domoritz · 2026-01-07T03:16:32Z

Makes sense. Eslint will also support format on save.

domoritz · 2026-01-07T03:17:12Z

Ci is failing btw. We probably need to reformat as well.

theVedanta · 2026-01-07T03:18:23Z

yep, lemme check it out

domoritz · 2026-01-07T20:09:49Z

eslint.config.js

 import js from '@eslint/js';
 import tseslint from 'typescript-eslint';
 import globals from 'globals';
+import prettier from 'eslint-config-prettier';


shouldn't this be import eslintConfigPrettier from "eslint-config-prettier/flat";? That's what https://www.npmjs.com/package/eslint-config-prettier says.

sorry I forgot tseslint returns the flat config array. Fixed now!

derekperkins · 2026-01-07T23:38:59Z

Should we add a command to package.json to write the changes?

domoritz · 2026-01-08T15:29:40Z

Yes

theVedanta · 2026-01-08T15:49:29Z

I added the script and formatted the files in two separate commits; I don't know if the change is too drastic to review, if it is we can undo this format command and leave it up to the developers to use later (?)

domoritz · 2026-01-08T16:41:51Z

package.json

    "clean": "lerna run clean",
    "lint": "lerna run lint",
    "test": "tsc --build && lerna run schema && vitest run",
+    "write": "prettier --write '**/*.{js,ts,json,yaml}'",


No, please add format or lint:fix and let ESLint fix things.

theVedanta · 2026-01-09T21:51:08Z

I added both format and lint:fix; not sure if we want individual package scripts for this in the packages and let lerna execute

domoritz

Overall looks reasonable with a few comments below. Thanks for your help here!

domoritz · 2026-01-09T22:13:14Z

docs/public/contours.yaml

 params:
  bandwidth: 50
  thresholds: 10
 plot:


Isn't this generated? Then we should not reformat.

what other files would this go for? just making sure I know what else is generated here

I think the yaml and esm example are all generated. Try building the library and website without formatting and see whether anything gets reset.

domoritz · 2026-01-09T22:13:34Z

package.json

    "test": "tsc --build && lerna run schema && vitest run",
+    "format": "prettier --write '**/*.{js,ts,tsx,json,css,md}'",
+    "lint:fix": "eslint '**/*.{js,ts,tsx}' --fix",
+    "format:check": "prettier --check '**/*.{js,ts,tsx,json,css,md}'",


That should be in lint already.

what should be in lint? Sorry I don't understand?

Lint should be a superset of format check

domoritz · 2026-01-09T22:13:49Z

package.json

    "clean": "lerna run clean",
    "lint": "lerna run lint",
    "test": "tsc --build && lerna run schema && vitest run",
+    "format": "prettier --write '**/*.{js,ts,tsx,json,css,md}'",


Lint fix and format should be the same

would having prettier-format not address more of files that eslint cannot go over though?

Maybe. But then we should still have them in one command. I am also less worried about files other than ts.

That makes sense. would you like me to make a combined command for them or just get rid of the prettier --write entirely?

How much do we benefit from combined vs remove?

How about we do:

"lint:fix": "eslint '**/*.{js,ts,tsx}' --fix && prettier --write '**/*.{js,ts,tsx,json,css,md}'",

and then have a format:write command separately for the --write? Best of both worlds imo

I don't suppose it's any harm removing the format command though; if we dont care about the files other than ts

domoritz · 2026-01-09T22:14:31Z

packages/examples/vanilla-example/src/main.js

+document
+  .getElementById('plot')
+  .replaceChildren(
+    vg.plot(vg.lineY(vg.from('aapl'), { x: 'Date', y: 'Close', tip: true }), vg.width(680), vg.height(200))


This is worse in terms of readability. Any ideas how we can improve?

umm.. I would say

printWidth should be shorter like 80 or so (I tested 80 and works okay for me)

es5 for the trailing commas

Doing that now...

Let's try different line widths and see what gives us good results and fewer changes.

Why would trailing commas help?

Maybe 100 is good

Yeah 100 works well for me too :)
We dont wanna use "all" for it since trailing commas are not seen in the project, so to keep things close to the previous version and reduce changes, I thought "es5" would be a good idea

domoritz · 2026-01-09T22:15:15Z

packages/examples/vega-example/src/main.js

+  .querySelector('#plots')
+  .replaceChildren(
+    vg.vconcat(
+      vg.hconcat(vg.hspace('2em'), vg.menu({ from: 'weather', column: 'weather', label: 'Weather', as: selection })),


This also looks worse. But maybe okay as a trade off.

packages/mosaic/core/src/Coordinator.ts

domoritz · 2026-01-09T22:16:50Z

packages/mosaic/core/src/MosaicClient.ts

   * @returns this
   */
-  queryError(error: Error): this { // eslint-disable-line @typescript-eslint/no-unused-vars
+  queryError(error: Error): this {


Why is this in a new line?

good catch! This is interesting because the printwidth will wrap it to the next line. We have the option to:

Move all these comments above the functions manually with eslint-disable-next-line (time-taking)

Rename all unused args to start with _ perhaps? and then ignore them in global eslint config with something like "@typescript-eslint/no-unused-vars": ["error", { "argsIgnorePattern": "^_" }]

1 seems cleaner. Even better might be to disable the check and use typescript with @ts-expect-error. The advantage of that is that this will error when the variable is actually used.

Pardon me, but why would you say that is an advantage?

domoritz · 2026-01-09T22:17:36Z

packages/mosaic/core/src/QueryConsolidator.ts

  const sql = `${query}`;
  if (isSelectQuery(query) && !cache.get(sql)) {
    if (
-      query._where.length || query._qualify.length || query._having.length ||


Was there a reason for the grouping? Maybe use comments.

domoritz · 2026-01-09T22:19:45Z

packages/mosaic/core/src/preagg/sufficient-statistics.ts

-      sub(y, avg(y as ColumnRefNode))
-    )
-  );
+  const sxy = sum(mul(sub(x, avg(x as ColumnRefNode)), sub(y, avg(y as ColumnRefNode))));


Harder to read

…use /flat & arrowParens

domoritz · 2026-01-13T16:44:24Z

.prettierrc.json

  "singleQuote": true,
  "tabWidth": 2,
-  "trailingComma": "none",
-  "printWidth": 120,


I think I prefer 100.

Gotcha, will set it to 100

prettier

3be879a

theVedanta marked this pull request as ready for review December 24, 2025 23:38

theVedanta requested review from domoritz and jheer as code owners December 24, 2025 23:38

domoritz requested changes Jan 7, 2026

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.prettierrc.json Outdated

{

"singleQuote": true,

"tabWidth": 2,

"trailingComma": "none"

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I think we want a print width of 120

eslint + dev dep + printwidth + ignore schema-files

11c5578

domoritz changed the title ~~Prettierrc added~~ chore: add pettier Jan 7, 2026

theVedanta added 3 commits January 6, 2026 21:24

test ci

0f1bc65

lock

3880433

Merge branch 'main' into prettierrc

c6ee681

domoritz reviewed Jan 7, 2026

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eslint-flat

6c8e7eb

deps

3018b44

write script

c5e4f42

theVedanta requested a review from derekperkins as a code owner January 8, 2026 15:45

domoritz requested changes Jan 8, 2026

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domoritz reviewed Jan 9, 2026

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theVedanta added 2 commits January 9, 2026 17:19

format, lint:fix, format:check & Bumped up eslint-config-prettier to …

680a8db

…use /flat & arrowParens

printwidth improve + es5 trailing comma

f96c15d

theVedanta force-pushed the prettierrc branch from de5e797 to f96c15d Compare January 9, 2026 23:24

lock

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domoritz reviewed Jan 13, 2026

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chore: add pettier #949

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chore: add pettier #949

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derekperkins commented Jan 7, 2026 •

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