v10.0.0

10.0.0 (2026-07-31)

• feat!: v10 — modernised toolchain, React 19 support, long-standing fixes (5647fab)

BREAKING CHANGES

• named export only (no default), /polyfilled entrypoint
  removed, zero runtime dependencies (@juggle/resize-observer dropped), react-dom
  no longer a peer, React >=18.2, ES2020 output (no IE11), and only the package
  root is importable. Full list with rationale in MIGRATION.md.

Toolchain (rebuilt end to end)

• Build: rollup + babel → tsdown (ESM + CJS + type declarations).
• Tests: jest + karma → Vitest in real browsers (Playwright), plus a
  WebdriverIO / BrowserStack suite on real desktop & mobile devices.
• Lint / format: eslint + prettier → oxlint + oxfmt.
• Package manager: yarn → pnpm; CI on Node 24 with OIDC trusted publishing.

Library

• React 19 support (18 kept); open-ended peer range so future majors work
  without a release here.
• onResize payload now carries the raw ResizeObserverEntry (every box size,
  entry.target), cross-window / iframe observation, and a measured 0 reports
  as 0 rather than undefined.

v10.0.0-alpha.3

10.0.0-alpha.3 (2026-07-31)

Bug Fixes

• don't call onResize after the component unmounts (cffac3a)

v10.0.0-alpha.2

10.0.0-alpha.2 (2026-07-31)

Features

• expose the raw ResizeObserverEntry in the onResize callback (148a985), closes #102

v10.0.0-alpha.1

10.0.0-alpha.1 (2026-07-30)

• feat!: v10 — docs, npm provenance, Dependabot (aced5cc)

Bug Fixes

• cross-window observation + report measured 0 (not undefined) (0b3bcb7), closes #100 #109 #113 #103

BREAKING CHANGES

• The default export has been removed. Use the named export instead:
  import { useResizeObserver } from "use-resize-observer";
  The "use-resize-observer/polyfilled" entrypoint has been removed, along with the
  @juggle/resize-observer dependency. The package now has zero runtime dependencies.
  React 16.8 - 17 are no longer supported; the peer range is now ^18.2 || ^19.
  react-dom is no longer a peer dependency.
  Output now targets ES2020; IE 11 is no longer supported.

Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com

v9.1.0

9.1.0 (2022-11-22)

Bug Fixes

• trigger release (da154e1)

Features

• Exported some TS types (3895bdf), closes #98

v9.1.0-alpha.1

9.1.0-alpha.1 (2022-11-21)

Features

• Exported some TS types (e056e19), closes #98

v9.0.2

9.0.2 (2022-06-13)

Bug Fixes

• Made element resolution compatbile with concurrent mode (c9c6689)
• Small changes and chores (0cb6800)

v9.0.0

9.0.0 (2022-05-15)

Bug Fixes

• Added some fixes for React 18. (852d976), closes #90 #91 #92

BREAKING CHANGES

• The lib now takes "Element", not only "HTMLElement", to
  be consistent with ResizeObserver.

v8.0.0

8.0.0 (2021-08-28)

Bug Fixes

• The onResize callback is no longer incorrectly called with the same values. (bd0f3c8)

Features

• Added the box option (0ca6c23), closes #31 #57
• Added the round option. (aa38199), closes #55 #46 #61

BREAKING CHANGES

• Removed resize-observer-polyfill in favour of @juggle/resize-observer. (8afc8f6)

v7.1.0 (Accidental Release)

This was an accidental release, and an equivalent of V8.

The breaking change is the replacement of resize-observer-polyfill by @juggle/resize-observer for the polyfillled module.

See the v8 release notes.