Bug 306868 – REGRESSION (306223@main): Remote Web Inspector broken

• Status: RESOLVED
• Resolution: FIXED
• Component: Web Inspector

[Pablo Saavedra]

... in WPEWebKit , al least,  after replacing `getOrInitialize` with `getOrInsert`

After the following upstream commit was merged:

```
commit dd0d4ef9add2b1027a94058301a6714dee05c813
Author: Devin Rousso <[e-mail]>
Date:   Mon Jan 26 10:48:31 2026 -0800

    Web Inspector: remove `Map.prototype.getOrInitialize` in favor of `Map.prototype.getOrInsert`
    https://bugs.webkit.org/show_bug.cgi?id=306234
```

the **Remote Web Inspector** no longer works.

**Steps to Reproduce:**

1. Build WPE WebKit at or after commit `dd0d4ef9add2b1027a94058301a6714dee05c813`.  
2. Launch a WebKit‑based application (e.g. `MiniBrowser` or a remote web process) with the Web Inspector enabled.  
3. Connect via the remote inspector 
4. Observe that the inspector fails to initialize or crashes.

**Observed Result:**  
Inspector UI does not load.


```
  Uncaught TypeError:​ this._contentViewsForTarget.getOrInsert is not a function (at ScriptClusterTimelineView.js:​171:​56)​
    ?​ @ TypeError:​ this._contentViewsForTarget.getOrInsert is not a function
    ?​ @ ScriptClusterTimelineView.js:​171:​56)​
    ?​ @ ScriptClusterTimelineView.js:​64:​14)​
    ?​ @ ContentView.js:​87:​24)​
    ?​ @ TimelineRecordingContentView.js:​685:​60)​
    ?​ @ TimelineRecordingContentView.js:​121:​18)​
    ?​ @ ContentView.js:​76:​20)​
    ?​ @ ContentView.js:​220:​45)​
    ?​ @ ContentViewContainer.js:​68:​31)​
    ?​ @ ContentBrowser.js:​162:​43)​
    ?​ @ TimelineTabContentView.js:​651:​58)​

**Expected Result:**  

- Remote Web Inspector should load and function normally.

**Notes:**  

- Possible workaround: revert `dd0d4ef9` or manually re‑introduce shim for `Map.prototype.getOrInitialize`.

[Devin Rousso]

Pull request: https://github.com/WebKit/WebKit/pull/57783

[Pablo Saavedra]

https://github.com/WebKit/WebKit/pull/57783 fixes this issue.

[EWS]

Committed 306724@main (18398035e7a4): <https://commits.webkit.org/306724@main>

Reviewed commits have been landed. Closing PR #57783 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/169546674>