bigint key in Map

[Reububble]

Description
Setting a key with type bigint in a Map makes the Map throw an error when viewed in the watch/variable pane, or when attempting to view it in the debug console. The error seen is:

Error processing variables: TypeError: Cannot read properties of undefined (reading 'length')
    at c:\Users\rwillson\AppData\Local\Programs\Microsoft VS Code\resources\app\extensions\ms-vscode.js-debug\src\extension.js:2:860531
    at h (c:\Users\rwillson\AppData\Local\Programs\Microsoft VS Code\resources\app\extensions\ms-vscode.js-debug\src\extension.js:2:860747)
    at d (c:\Users\rwillson\AppData\Local\Programs\Microsoft VS Code\resources\app\extensions\ms-vscode.js-debug\src\extension.js:2:858822)
    at Object.t.previewRemoteObject (c:\Users\rwillson\AppData\Local\Programs\Microsoft VS Code\resources\app\extensions\ms-vscode.js-debug\src\extension.js:2:863968)
    at U.toDap (c:\Users\rwillson\AppData\Local\Programs\Microsoft VS Code\resources\app\extensions\ms-vscode.js-debug\src\extension.js:2:959877)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at U.toDap (c:\Users\rwillson\AppData\Local\Programs\Microsoft VS Code\resources\app\extensions\ms-vscode.js-debug\src\extension.js:2:962103)
    at async Promise.all (index 5)
    at n.getVariables (c:\Users\rwillson\AppData\Local\Programs\Microsoft VS Code\resources\app\extensions\ms-vscode.js-debug\src\extension.js:2:967510)
    at j._onVariables (c:\Users\rwillson\AppData\Local\Programs\Microsoft VS Code\resources\app\extensions\ms-vscode.js-debug\src\extension.js:2:839447)
    at t.default._onMessage (c:\Users\rwillson\AppData\Local\Programs\Microsoft VS Code\resources\app\extensions\ms-vscode.js-debug\src\extension.js:2:1070672)

Although the debugger breaks in this way, the code still seems to function. i.e. The Map does contain the key value pair and retrieving it will return the correct result at runtime, even through the debug console.

To Reproduce
In a javascript file use the following code

const a = new Map();
a.set(1n, "value");
debugger; // break here

Run and debug using node. You will see that the variables tab shows the error. If you enter a into the debug console the same error appears there.

Log File
vscode-debugadapter-c1843209.json.gz

VS Code Version:
Version: 1.67.1 (user setup)
Commit: da15b6fd3ef856477bf6f4fb29ba1b7af717770d
Date: 2022-05-06T12:37:03.389Z
Electron: 17.4.1
Chromium: 98.0.4758.141
Node.js: 16.13.0
V8: 9.8.177.13-electron.0
OS: Windows_NT x64 10.0.18362

[Reububble]

It might also be relevant that console.log(a) will not log anything to console when a contains a bigint key either

[connor4312]

Good catch, thanks for the report