# Apache Arrow JS v21.0.0-rc1 — Apache Arrow JS 21.0.0 RC1

- Product: Apache Arrow JS (https://whatsnew.fyi/product/apache-arrow-js)
- Vendor: Apache
- Date: 2025-07-01
- Version: v21.0.0-rc1
- Original notes: https://github.com/apache/arrow-js/releases/tag/v21.0.0-rc1
- Permalink: https://whatsnew.fyi/product/apache-arrow-js/releases/v21.0.0-rc1
- Labels: Pre-release

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Add LICENSE.txt and NOTICE.txt
- **added** — Add .github/ISSUE_TEMPLATE
- **added** — Add pull request template
- **added** — Add CODE_OF_CONDUCT.md
- **added** — Add CONTRIBUTING.md
- **added** — Add shfmt and shellcheck linters
- **changed** — Enable CI
- **changed** — Use the PR title and description by default for squash and merge
- **changed** — Move config.yaml to config.yml
- **changed** — Enable Dependabot
- **changed** — Enable integration tests
- **changed** — Migrate ESLint 8 to 9
- **changed** — Run Release Audit Tool in CI
- **changed** — Update repository URLs
- **changed** — Use Node.js 20
- **changed** — Publish docs
- **removed** — Remove lerna from package.json
- **removed** — Remove create:testdata/clean:testdata from package.json
- **removed** — Remove xml2js dependency

##### What's Changed
* Add LICENSE.txt and NOTICE.txt by @kou in https://github.com/apache/arrow-js/pull/12
* Enable CI by @kou in https://github.com/apache/arrow-js/pull/18
* GH-7: Add .github/ISSUE_TEMPLATE by @raulcd in https://github.com/apache/arrow-js/pull/16
* Use the PR title and description by default for squash and merge by @kou in https://github.com/apache/arrow-js/pull/20
* Move config.yaml.to config.yml by @raulcd in https://github.com/apache/arrow-js/pull/21
* Enable Dependabot by @kou in https://github.com/apache/arrow-js/pull/22
* chore: bump memfs from 4.17.0 to 4.17.2 by @dependabot in https://github.com/apache/arrow-js/pull/24
* chore: bump flatbuffers from 25.1.24 to 25.2.10 by @dependabot in https://github.com/apache/arrow-js/pull/25
* chore: bump @types/node from 20.14.9 to 22.15.21 by @dependabot in https://github.com/apache/arrow-js/pull/28
* chore: bump typedoc from 0.27.9 to 0.28.4 by @dependabot in https://github.com/apache/arrow-js/pull/29
* chore: bump gulp-esbuild from 0.13.0 to 0.14.0 by @dependabot in https://github.com/apache/arrow-js/pull/32
* chore: bump rollup from 4.24.3 to 4.41.0 by @dependabot in https://github.com/apache/arrow-js/pull/31
* chore: Add pull request template by @kou in https://github.com/apache/arrow-js/pull/33
* chore: Enable integration tests by @kou in https://github.com/apache/arrow-js/pull/34
* chore: bump typedoc from 0.28.4 to 0.28.5 by @dependabot in https://github.com/apache/arrow-js/pull/37
* chore: bump @swc/core from 1.6.6 to 1.11.29 by @dependabot in https://github.com/apache/arrow-js/pull/38
* chore: bump webpack from 5.96.1 to 5.99.9 by @dependabot in https://github.com/apache/arrow-js/pull/40
* chore: bump actions/setup-python from 5.3.0 to 5.6.0 by @dependabot in https://github.com/apache/arrow-js/pull/43
* chore: bump @rollup/plugin-node-resolve from 16.0.0 to 16.0.1 by @dependabot in https://github.com/apache/arrow-js/pull/39
* chore: bump @types/jest from 29.5.12 to 29.5.14 by @dependabot in https://github.com/apache/arrow-js/pull/42
* chore: Migrate ESLint 8 to 9 by @kou in https://github.com/apache/arrow-js/pull/128
* chore: Run Release Audit Tool in CI by @kou in https://github.com/apache/arrow-js/pull/129
* chore: bump @swc/helpers from 0.5.15 to 0.5.17 by @dependabot in https://github.com/apache/arrow-js/pull/131
* chore: bump typescript-eslint from 8.32.1 to 8.33.1 by @dependabot in https://github.com/apache/arrow-js/pull/132
* chore: bump esbuild from 0.25.0 to 0.25.5 by @dependabot in https://github.com/apache/arrow-js/pull/134
* chore: Add CODE_OF_CONDUCT.md by @kou in https://github.com/apache/arrow-js/pull/141
* chore: bump rollup from 4.41.0 to 4.42.0 by @dependabot in https://github.com/apache/arrow-js/pull/150
* chore: bump eslint from 9.27.0 to 9.28.0 by @dependabot in https://github.com/apache/arrow-js/pull/151
* chore: bump @swc/core from 1.11.29 to 1.11.31 by @dependabot in https://github.com/apache/arrow-js/pull/152
* Prepare release scripts by @kou in https://github.com/apache/arrow-js/pull/137
* chore: Update repository URLs by @kou in https://github.com/apache/arrow-js/pull/146
* chore: Add CONTRIBUTING.md by @kou in https://github.com/apache/arrow-js/pull/142
* chore: Remove `lerna` from `package.json` by @kou in https://github.com/apache/arrow-js/pull/144
* chore: Remove `create:testdata`/`clean:testdata` in `package.json` by @kou in https://github.com/apache/arrow-js/pull/148
* chore: bump google-closure-compiler from 20240317.0.0 to 20250603.0.0 by @dependabot in https://github.com/apache/arrow-js/pull/149
* chore: Remove xml2js dependency by @kou in https://github.com/apache/arrow-js/pull/155
* chore: bump eslint from 9.28.0 to 9.29.0 by @dependabot in https://github.com/apache/arrow-js/pull/160
* chore: bump @types/node from 22.15.21 to 24.0.3 by @dependabot in https://github.com/apache/arrow-js/pull/161
* chore: Add shfmt and shellcheck linters by @kou in https://github.com/apache/arrow-js/pull/158
* chore: bump google-closur

_[Truncated at 4000 characters — full notes: https://github.com/apache/arrow-js/releases/tag/v21.0.0-rc1]_