Upgrade Electron from 36 to 40 by Copilot · Pull Request #416 · iTwin/viewer

Copilot · 2026-02-25T09:43:17Z

Update electron from ^36.0.0 to ^40.0.0 in packages/templates/desktop/package.json
Update electron devDependency to ^40.0.0 in packages/modules/desktop-viewer-react/package.json
Widen electron peerDependency in packages/modules/desktop-viewer-react/package.json to >=36.0.0 <41.0.0 (supports Electron 36–40)
Update electron from ^36.0.0 to ^40.0.0 in packages/apps/desktop-viewer-test/package.json
Add rush change file for @itwin/desktop-viewer-react (minor bump — "Added support for Electron 37, 38, 39, and 40")
Run rush update to refresh pnpm-lock.yaml
Fix build failure: update @itwin/electron-authorization to ^0.22.0 (supports Electron 40), update caniuse-lite to 1.0.30001774 (fixes stale browserslist warning), add caniuse-lite preferred version to common-versions.json

Original prompt

This section details on the original issue you should resolve

<issue_title>Upgrade desktop template to Electron 40</issue_title>
<issue_description>Desktop template still uses Electron 36 which is no longer supported by Electron team. We should upgrade to latest Electron version.</issue_description>

<agent_instructions>Make sure to check breaking changes and if any affect viewer</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes Upgrade desktop template to Electron 40 #415

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Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

GytisCepk · 2026-02-25T09:49:38Z

@copilot, changes in desktop-viewer-react are breaking. Can you explain why and fix it ?

GytisCepk · 2026-02-25T09:52:40Z

@copilot, changes in desktop-viewer-react are breaking. Can you explain why and fix it ?

@copilot hello ? Are you on the lunch break or something ?

Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot · 2026-02-25T09:54:46Z

@copilot, changes in desktop-viewer-react are breaking. Can you explain why and fix it ?

The change to peerDependencies.electron was breaking because desktop-viewer-react is a published library. In npm semver, ^36.0.0 means >=36.0.0 <37.0.0 and ^40.0.0 means >=40.0.0 <41.0.0 — so bumping the peer dep from 36 to 40 would cause peer dependency conflicts for any consumer still on Electron 36–39.

Fixed in 6fb9b5f: reverted peerDependencies.electron back to ^36.0.0. The devDependencies stays at ^40.0.0 since that only affects the library's own dev environment.

GytisCepk · 2026-02-25T10:53:02Z

@copilot , how can we have dev dependency which does not match peer dependency ?

Just make peer dependencies range from 36 to 40 and make sure there is no problems with breaking changes from Electron side. Also, list out all Electron breaking changes and explain how they affect package(s)

…0 <41.0.0 Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot · 2026-02-25T10:55:10Z

@copilot , how can we have dev dependency which does not match peer dependency ?

Just make peer dependencies range from 36 to 40 and make sure there is no problems with breaking c...

Fixed in df43a03. peerDependencies.electron is now >=36.0.0 <41.0.0, accepting any consumer on Electron 36–40. devDependencies stays at ^40.0.0 so the library itself is always developed against the latest Electron.

Electron breaking changes 37–40 and their impact on this package:

This package doesn't call any Electron APIs directly — it goes through @itwin/core-electron (ElectronApp.startup/shutdown) and @itwin/electron-authorization (ElectronRendererAuthorization). None of the changes below affect our code:

Version	Change	Impact
38	Removed `ELECTRON_OZONE_PLATFORM_HINT` env var	Not used anywhere
39	Deprecated `--host-rules` CLI switch → use `--host-resolver-rules`	Not used
39	`window.open` popups are always resizable	Not used
39	`NSAudioCaptureUsageDescription` required for `desktopCapturer` on macOS ≥14.2	Not used
39	Shared texture OSR `paint` event structure changed	Not used
40	`clipboard` API deprecated from renderer processes	Not used
40	macOS dSYM files now `.tar.xz` instead of `.zip`	Build artifact only, no code impact

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www.electronjs.org
- Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

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GytisCepk · 2026-02-25T11:02:17Z

@copilot , run rush change

…p update Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot · 2026-02-25T11:08:45Z

@copilot , run rush change

Done in 85e22f4. Added the rush change file at common/changes/@itwin/desktop-viewer-react/copilot-upgrade-desktop-template-electron-40-2026-02-25-10-53.json with a minor bump type, since widening the peer dependency range adds support for new Electron versions (37–40) in a backwards-compatible way.

GytisCepk · 2026-02-25T11:14:57Z

@copilot , change changelog message to be closer to something like "Added support for Electron ..."

… and 40" Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot · 2026-02-25T11:15:54Z

@copilot , change changelog message to be closer to something like "Added support for Electron ..."

Updated in 3f0848a — the changelog message is now "Added support for Electron 37, 38, 39, and 40".

GytisCepk · 2026-02-25T11:17:24Z

@copilot , run rush update

Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot · 2026-02-25T11:20:10Z

@copilot , run rush update

Done in 76e75d5. pnpm-lock.yaml has been updated to reflect the new electron 40 dependency versions.

Copilot

Pull request overview

Upgrades the desktop viewer template and related workspace packages to Electron 40, and updates the monorepo lockfile + change tracking to reflect the new supported Electron range.

Changes:

Bump Electron dependency to ^40.0.0 in the desktop template, desktop-viewer test app, and @itwin/desktop-viewer-react devDependencies.
Widen @itwin/desktop-viewer-react Electron peerDependency to support Electron 36–40.
Refresh pnpm-lock.yaml and add a Rush change file for @itwin/desktop-viewer-react.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
packages/templates/desktop/package.json	Updates template Electron dependency to v40.
packages/modules/desktop-viewer-react/package.json	Updates Electron devDependency and widens Electron peerDependency range.
packages/apps/desktop-viewer-test/package.json	Updates test app Electron dependency to v40.
common/config/rush/pnpm-lock.yaml	Updates resolved Electron version and refreshes transitive dependency graph.
common/changes/@itwin/desktop-viewer-react/copilot-upgrade-desktop-template-electron-40-2026-02-25-10-53.json	Adds Rush change entry for the module release notes/version bump.

Files not reviewed (1)

common/config/rush/pnpm-lock.yaml: Language not supported

Comments suppressed due to low confidence (1)

common/config/rush/pnpm-lock.yaml:3609

@itwin/electron-authorization@0.21.1 declares a peerDependency of electron ">=35.0.0 <37.0.0", but the lockfile resolves electron 40.6.1 here. This is a hard incompatibility on paper; to support Electron 40 you'll likely need a newer @itwin/electron-authorization version (and possibly other iTwin Electron packages) that widens this range.

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Copilot · 2026-02-25T11:33:05Z

packages/apps/desktop-viewer-test/package.json

    "@itwin/unified-selection-react": "^1.0.0",
    "dotenv-flow": "^3.2.0",
-    "electron": "^36.0.0",
+    "electron": "^40.0.0",


Electron is updated to v40 here, but @itwin/core-electron and @itwin/electron-authorization currently in the dependency graph still constrain Electron to <37 / ^36 (per pnpm-lock.yaml). This likely results in peer dependency conflicts and may indicate Electron 40 isn't actually supported without upgrading those iTwin Electron packages.

Suggested change

"electron": "^40.0.0",

"electron": "^36.0.0",

Copilot · 2026-02-25T11:33:05Z

packages/modules/desktop-viewer-react/package.json

    "@itwin/electron-authorization": "^0.21.0",
    "@itwin/presentation-frontend": "^5.0.0",
-    "electron": "^36.0.0",
+    "electron": ">=36.0.0 <41.0.0",


The peerDependency is widened to include Electron 37–40, but the dependent iTwin Electron packages in this repo (notably @itwin/core-electron@5.0.4 and @itwin/electron-authorization@0.21.1) currently declare Electron peer ranges that only cover ~35–36 (see pnpm-lock.yaml). Either bump those packages to versions that support Electron 40, or tighten this peerDependency to match what the underlying stack supports so consumers don't end up with an unsupported combination.

Suggested change

"electron": ">=36.0.0 <41.0.0",

"electron": ">=35.0.0 <37.0.0",

Copilot · 2026-02-25T11:33:05Z

common/config/rush/pnpm-lock.yaml

+  /@itwin/core-bentley/5.6.1:
+    resolution: {integrity: sha512-eBVe6EvHXI06e9MOHVHGF5QCkwJlZzv6MXrNDzS+N5BvQatNMabPwk2jYbU/R8wFn/ow4ArlQZsRcOVhqfWGgg==}
+    dev: false
+


The lockfile now includes @itwin/core-bentley 5.6.1 alongside 5.0.4, which will lead to multiple versions of core packages in the install graph. iTwin packages are often sensitive to version skew; if possible, align @itwin/core-* (and related) versions to a single minor version to avoid duplicate copies and subtle runtime/type issues.

Suggested change

/@itwin/core-bentley/5.6.1:

resolution: {integrity: sha512-eBVe6EvHXI06e9MOHVHGF5QCkwJlZzv6MXrNDzS+N5BvQatNMabPwk2jYbU/R8wFn/ow4ArlQZsRcOVhqfWGgg==}

dev: false

Copilot · 2026-02-25T11:33:06Z

common/config/rush/pnpm-lock.yaml

      '@itwin/core-frontend': 5.0.4_f6igwkv6kow3vvn4d3fcwhbsaq
      '@openid/appauth': 1.3.2
-      electron: 36.7.3
+      electron: 40.6.1


This lockfile now resolves electron 40.6.1 under @itwin/core-electron@5.0.4, but @itwin/core-electron@5.0.4 declares an Electron peer range limited to ^35 || ^36 (see its peerDependencies a few lines above). To avoid an unsupported combination, upgrade @itwin/core-electron to a version that supports Electron 40 (and align related @itwin/core-* packages), or keep Electron within the supported peer range.

Suggested change

electron: 40.6.1

electron: 36.0.0

Copilot · 2026-02-25T11:33:06Z

common/config/rush/pnpm-lock.yaml

    peerDependencies:
-      '@itwin/appui-abstract': ^5.0.0
+      '@itwin/appui-abstract': ^5.1.0
      '@itwin/appui-react': ^5.6.0
      '@itwin/components-react': ^5.6.0
-      '@itwin/core-bentley': ^5.0.0
-      '@itwin/core-common': ^5.0.0
-      '@itwin/core-frontend': ^5.0.0
-      '@itwin/core-geometry': ^5.0.0
-      '@itwin/core-quantity': ^5.0.0
+      '@itwin/core-bentley': ^5.1.0
+      '@itwin/core-common': ^5.1.0


@itwin/measure-tools-react@0.32.0 declares peerDependencies on @itwin/core-bentley/core-common/etc. ^5.1.0+, but this repo is still resolving the 5.0.4 iTwin stack in multiple importers. Either pin measure-tools-react to a version compatible with 5.0.4, or upgrade the relevant @itwin/* dependencies so the declared peer ranges are satisfied.

Copilot · 2026-02-25T11:33:06Z

packages/templates/desktop/package.json

    "cross-env": "^7.0.3",
    "dotenv-flow": "^3.2.0",
-    "electron": "^36.0.0",
+    "electron": "^40.0.0",


This bumps Electron to v40, but the current iTwin Electron integration dependencies in this template (e.g., @itwin/core-electron and @itwin/electron-authorization) still declare Electron peer ranges that only cover ~35–36 (see pnpm-lock.yaml entries). As-is, this creates a peer-dependency incompatibility and may break the template unless those packages are upgraded to versions that support Electron 40 (or Electron is kept within the supported range).

Suggested change

"electron": "^40.0.0",

"electron": "^36.0.0",

GytisCepk · 2026-02-25T11:36:26Z

@copilot, fix build failure

Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot · 2026-02-25T11:51:57Z

@copilot, fix build failure

Fixed in a5a8afb. Two root causes:

Stale caniuse-lite — caniuse-lite@1.0.30001727 (July 2025, ~8 months old) was causing @itwin/web-viewer-test's vite build to print a browserslist warning to stderr, which Rush treats as "success with warnings" and exits with code 1. Updated to 1.0.30001774 (released Feb 23, 2026) via preferredVersions in common-versions.json.
@itwin/electron-authorization peer conflict — 0.21.1 only accepted electron@">=35.0.0 <37.0.0", conflicting with our Electron 40 install. Updated to ^0.22.0 which resolves to 0.22.1 and accepts electron@">=35.0.0 <41.0.0".

Note: @itwin/core-electron@5.x stable still only declares peer support up to Electron 39 — no stable release supporting Electron 40 exists yet. The build succeeds despite this advisory warning.

GytisCepk · 2026-02-25T15:00:39Z

Postponing this PR till 5.7 is out

Initial plan

31c76de

Copilot AI assigned Copilot and GytisCepk Feb 25, 2026

Copilot started work on behalf of GytisCepk February 25, 2026 09:43 View session

Upgrade Electron from 36 to 40 in desktop packages

a66898d

Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Upgrade desktop template to Electron 40~~ Upgrade Electron from 36 to 40 Feb 25, 2026

Copilot finished work on behalf of GytisCepk February 25, 2026 09:46

Copilot started work on behalf of GytisCepk February 25, 2026 09:52 View session

Revert desktop-viewer-react peerDependencies electron to ^36.0.0

6fb9b5f

Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot finished work on behalf of GytisCepk February 25, 2026 09:55

Copilot started work on behalf of GytisCepk February 25, 2026 10:53 View session

Widen desktop-viewer-react peerDependencies electron range to >=36.0.…

df43a03

…0 <41.0.0 Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot finished work on behalf of GytisCepk February 25, 2026 10:55

Copilot started work on behalf of GytisCepk February 25, 2026 11:02 View session

Add rush change file for @itwin/desktop-viewer-react electron peer de…

85e22f4

…p update Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot finished work on behalf of GytisCepk February 25, 2026 11:09

Copilot started work on behalf of GytisCepk February 25, 2026 11:15 View session

Update rush change comment to "Added support for Electron 37, 38, 39,…

3f0848a

… and 40" Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot finished work on behalf of GytisCepk February 25, 2026 11:16

Copilot started work on behalf of GytisCepk February 25, 2026 11:17 View session

Run rush update to refresh pnpm lockfile for electron 40 upgrade

76e75d5

Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot finished work on behalf of GytisCepk February 25, 2026 11:20

GytisCepk requested a review from Copilot February 25, 2026 11:26

Copilot started reviewing on behalf of GytisCepk February 25, 2026 11:26 View session

Copilot AI reviewed Feb 25, 2026

View reviewed changes

Copilot started work on behalf of GytisCepk February 25, 2026 11:36 View session

Fix build failure: update caniuse-lite and @itwin/electron-authorization

a5a8afb

Co-authored-by: GytisCepk <98940208+GytisCepk@users.noreply.github.com>

Copilot finished work on behalf of GytisCepk February 25, 2026 11:52

	"electron": ">=36.0.0 <41.0.0",
	"electron": ">=35.0.0 <37.0.0",

	/@itwin/core-bentley/5.6.1:
	resolution: {integrity: sha512-eBVe6EvHXI06e9MOHVHGF5QCkwJlZzv6MXrNDzS+N5BvQatNMabPwk2jYbU/R8wFn/ow4ArlQZsRcOVhqfWGgg==}
	dev: false

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