phetsims/chipper

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Tools for developing and building PhET interactive simulations.

Stars: 17
Forks: 20
Open beginner issues: 0
Indexed issues: 180

Dominant language: TypeScript
License: MIT
Last GitHub push: Jul 7, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

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180 open issues indexed

Identify further updates to A11y View to make it clear public-facing document for show casing available description (Interactive, Core, Some) Open

a11y:wcag-aa design:general priority:5-deferred

phetsims/chipper#1682 · 2 comments · 3 assignees · Opened Jun 24, 2026
npm ci fails on Windows when dev-server is running Open

status:ready-for-review

phetsims/chipper#1672 · 18 comments · 1 assignee · Opened Apr 23, 2026
Factoring out intermediate/partial strings fails the build Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

phetsims/chipper#1661 · 9 comments · Opened Feb 13, 2026
Update to TypeScript 7 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

phetsims/chipper#1651 · 22 comments · Opened Dec 3, 2025
For the yaml select syntax, cascaded variables should have the same possibilities Open

phetsims/chipper#1646 · 1 comment · 1 assignee · Opened Nov 10, 2025
Should fluent support string keys that start with an _underscore? Open

status:ready-for-review

phetsims/chipper#1643 · 3 comments · 1 assignee · Opened Nov 8, 2025
Support fluent fragments in yaml in the IDE with language injection Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

phetsims/chipper#1641 · 1 comment · Opened Nov 5, 2025
Move all modulify functionality into `grunt dev-server` and builds (eliminate machine generated files) Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

phetsims/chipper#1638 · Opened Oct 22, 2025
Consider LTR embedding marks for display in the a11y view. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

phetsims/chipper#1634 · 1 comment · Opened Oct 2, 2025
Safety for Fluent string dependencies Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

phetsims/chipper#1626 · 9 comments · Opened Aug 28, 2025
CT AssertionError [ERR_ASSERTION]: unused deprecated strings exist on main. let's remove them Open

type:automated-testing

phetsims/chipper#1615 · 1 assignee · Opened Aug 1, 2025
Support DynamicStringTest with Fluent patterns Open

dev:description dev:help-wanted

Difficulty 3/5 1-2 days Newbie friendliness 42/100

phetsims/chipper#1610 · 5 comments · Opened Jul 10, 2025
Sabotaging a key does not fail `grunt modulify --targets=strings` Open

status:ready-for-review

phetsims/chipper#1603 · 1 comment · 1 assignee · Opened Jun 24, 2025
tsc -b (with composite:true) is failing due to cached tsc outDir. Open

phetsims/chipper#1596 · 1 comment · 2 assignees · Opened Jun 4, 2025
Should we create a new /generated directory for machine written files? Open

dev:help-wanted

Difficulty 5/5 Over a week Newbie friendliness 30/100

phetsims/chipper#1595 · 3 comments · Opened May 30, 2025
Query Parameters for Voicing and Interactive Highlights Open

a11y:wcag-a a11y:wcag-aa

phetsims/chipper#1591 · 2 comments · 1 assignee · Opened May 20, 2025
Add direct support for YAML, or add a banner that JSON was auto-generated from it Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

phetsims/chipper#1589 · 3 comments · Opened May 12, 2025
Browser and Platform Dependent Memory Leak Open

type:bug type:performance

phetsims/chipper#1586 · 29 comments · 2 assignees · Opened May 2, 2025
Remove Ready-For-Review Triage Project Board Open

phetsims/chipper#1585 · 2 comments · 1 assignee · Opened May 1, 2025
`grunt dev-server` fails when checking out different chipper and running `npm prune` Open

priority:2-high type:bug

phetsims/chipper#1577 · 3 comments · 1 assignee · Opened Apr 18, 2025
Best way to point to `grunt dev-server-runnable` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

phetsims/chipper#1574 · 4 comments · Opened Mar 28, 2025
use bun in grunt dev-server Open

priority:5-deferred

Difficulty 4/5 3-5 days Newbie friendliness 35/100

phetsims/chipper#1573 · 5 comments · Opened Mar 28, 2025
Rename string json key "metadata" to "phetioMetadata" Open

status:ready-for-review

phetsims/chipper#1563 · 2 comments · 1 assignee · Opened Feb 27, 2025
Potential Circular Dependency Issues Open

status:ready-for-review type:open-source-ecosystem

phetsims/chipper#1550 · 4 comments · 1 assignee · Opened Dec 18, 2024
grunt transpile --live fails to pick up file changes Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

phetsims/chipper#1542 · 1 comment · Opened Dec 7, 2024
Odd Webstorm behavior when linting with nested eslint.config.mjs files Open

priority:5-deferred

Difficulty 4/5 3-5 days Newbie friendliness 20/100

phetsims/chipper#1541 · 5 comments · Opened Dec 4, 2024
Use type LocaleData at sites that load localeData.json Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

phetsims/chipper#1539 · Opened Dec 3, 2024
Add better types for LicenseEntry Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

phetsims/chipper#1538 · Opened Dec 3, 2024
Improve names/types in ChipperStringUtils Open

dev:typescript

Difficulty 3/5 1-2 days Newbie friendliness 35/100

phetsims/chipper#1537 · Opened Dec 3, 2024
branch: fluent Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

phetsims/chipper#1532 · Opened Nov 22, 2024
commits for https://github.com/phetsims/chipper/issues/1521 Open

Difficulty 5/5 Over a week Newbie friendliness 10/100

phetsims/chipper#1528 · Opened Nov 20, 2024
Generalize the a11y view to work in other contexts Open

dev:description type:open-source-ecosystem

phetsims/chipper#1512 · 11 comments · 2 assignees · Opened Nov 1, 2024
Improve formatting of A11y View. Open

design:description dev:description

phetsims/chipper#1510 · 21 comments · 1 assignee · Opened Oct 29, 2024
Revisit query parameters and package.json entries related to supported and designed features. Open

dev:alt-input dev:description

Difficulty 5/5 Over a week Newbie friendliness 25/100

phetsims/chipper#1503 · 4 comments · Opened Oct 20, 2024
Attempt to modularize `tsconfig/buildjson/` Open

priority:5-deferred

phetsims/chipper#1488 · 1 comment · 1 assignee · Opened Oct 11, 2024
Evaluate new options from tsc --init Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

phetsims/chipper#1486 · 1 comment · Opened Oct 11, 2024
Get rid of the need to put devDependencies: grunt in all sim repos Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

phetsims/chipper#1476 · Opened Sep 26, 2024
Always build the allHTML Open

status:ready-for-review

phetsims/chipper#1454 · 1 comment · 1 assignee · Opened Aug 22, 2024
NPM errors affecting MR deployments Open

type:bug

phetsims/chipper#1449 · 4 comments · 1 assignee · Opened Jul 18, 2024
Generating API files causes unexpected babel work in unrelated repos Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

phetsims/chipper#1439 · 7 comments · Opened Apr 22, 2024
"Abandon" grunt Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

phetsims/chipper#1436 · 6 comments · Opened Apr 11, 2024
Audit deprecated eslint rules Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

phetsims/chipper#1434 · Opened Apr 8, 2024
Use new "flat eslint.config.js" files Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

phetsims/chipper#1433 · Opened Apr 8, 2024
`screens/initialScreen` are not validated sometimes Open

dev:maintenance-release status:ready-for-review type:bug

phetsims/chipper#1423 · 6 comments · 2 assignees · Opened Mar 15, 2024
Add tooling to help with public/protected/private access modifiers Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

phetsims/chipper#1421 · 1 comment · Opened Mar 4, 2024
Detect SVG exported without width/height in modulify Open

phetsims/chipper#1420 · 1 assignee · Opened Feb 22, 2024
xhtml version doesn't load Open

priority:2-high status:ready-to-cherry-pick type:bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

phetsims/chipper#1413 · 15 comments · Opened Dec 14, 2023
Add required "asset" field to images/license.json Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

phetsims/chipper#1411 · 4 comments · 1 reaction · Opened Dec 8, 2023
Write a script that checks if any published sim uses a common code string key that doesn't exist on main Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

phetsims/chipper#1407 · 4 comments · Opened Sep 28, 2023
convert phetioCompareAPIs to typescript Open

dev:typescript

Difficulty 3/5 1-2 days Newbie friendliness 35/100

phetsims/chipper#1406 · 1 comment · Opened Sep 27, 2023

phetsims/chipper

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