javascript intellisense not handling nested jsdoc parameter type with array of defined type

Type: Bug

If I have a function that jsdoc, and a parameter on it is defined as an array of custom types, when you go to autocomplete/inspect the call, you only get hinting on the first element of the array.

VS Code version: Code - Insiders 1.137.0-insider (Universal) (af195aabe861b9d99fcb322904793322ae7f0952, 2026-09-03T08:01:42+02:00)
OS version: Darwin arm64 24.6.0
Modes:

System Info

|Item|Value|
|---|---|
|CPUs|Apple M3 Pro (12 x 2400)|
|GPU Status|2d_canvas: enabled
GPU0: VENDOR= 0x106b [Google Inc. (Apple)], DEVICE=0x0000 [ANGLE (Apple, ANGLE Metal Renderer: Apple M3 Pro, Version 15.7.9 (Build 24G830))], DRIVER_VENDOR=Apple, DRIVER_VERSION=15.7.9 *ACTIVE*
Machine model name: Mac
Machine model version: 15.7
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: enabled_on
trees_in_viz: disabled_off
video_decode: enabled
video_encode: enabled
webgl: enabled
webgpu: enabled
webnn: disabled_off|
|Load (avg)|2, 2, 3|
|Memory (System)|36.00GB (0.29GB free)|
|Process Argv|--crash-reporter-id e1738320-cefc-4c4f-8f67-a2b1e3258dd4|
|Screen Reader|no|
|VM|0%|
Extensions (50)

Name|Identifier|Author|Version
---|---|---|---
Better JSON5|blueglassblock.better-json5|BlueGlassBlock|1.7.0
Ruff|charliermarsh.ruff|charliermarsh|2026.76.0
ESLint|dbaeumer.vscode-eslint|dbaeumer|3.0.34
Docker DX|docker.docker|docker|0.18.0
GitLens — Git supercharged|eamodio.gitlens|eamodio|19.1.0
file-icons|file-icons.file-icons|file-icons|1.1.0
shell-format|foxundermoon.shell-format|foxundermoon|7.2.8
GitHub Pull Requests|github.vscode-pull-request-github|GitHub|0.164.0
Go|golang.go|golang|0.56.1
HashiCorp HCL|hashicorp.hcl|hashicorp|0.6.0
HashiCorp Terraform|hashicorp.terraform|hashicorp|2.40.0
Mise VSCode|hverlin.mise-vscode|hverlin|1.25.0
Jenkins Pipeline Linter Connector|janjoerke.jenkins-pipeline-linter-connector|janjoerke|1.2.0
Bash IDE|mads-hartmann.bash-ide-vscode|mads-hartmann|1.43.0
Container Tools|ms-azuretools.vscode-containers|ms-azuretools|2.5.0
Docker|ms-azuretools.vscode-docker|ms-azuretools|2.0.0
Kubernetes|ms-kubernetes-tools.vscode-kubernetes-tools|ms-kubernetes-tools|1.4.1
Playwright Test for VSCode|ms-playwright.playwright|ms-playwright|1.1.19
Black Formatter|ms-python.black-formatter|ms-python|2026.7.12461009
Python Debugger|ms-python.debugpy|ms-python|2026.7.12401009
isort|ms-python.isort|ms-python|2026.7.12461009
Python|ms-python.python|ms-python|2026.7.2026082601
Pylance|ms-python.vscode-pylance|ms-python|2026.3.1
Python Environments|ms-python.vscode-python-envs|ms-python|1.37.2026082701
Jupyter|ms-toolsai.jupyter|ms-toolsai|2026.6.2026071501
Jupyter Keymap|ms-toolsai.jupyter-keymap|ms-toolsai|1.1.2
Jupyter Notebook Renderers|ms-toolsai.jupyter-renderers|ms-toolsai|1.3.0
Jupyter Cell Tags|ms-toolsai.vscode-jupyter-cell-tags|ms-toolsai|0.1.9
Jupyter Slide Show|ms-toolsai.vscode-jupyter-slideshow|ms-toolsai|0.1.6
Dev Containers|ms-vscode-remote.remote-containers|ms-vscode-remote|0.468.0
Makefile Tools|ms-vscode.makefile-tools|ms-vscode|0.12.17
Flame Chart Visualizer for JavaScript Profiles|ms-vscode.vscode-js-profile-flame|ms-vscode|1.0.11
Love2D Support|pixelbyte-studios.pixelbyte-love2d|pixelbyte-studios|0.1.27
Ansible|redhat.ansible|redhat|26.8.2
Language Support for Java(TM) by Red Hat|redhat.java|redhat|1.55.0
Red Hat Commons|redhat.vscode-commons|redhat|0.0.6
YAML|redhat.vscode-yaml|redhat|1.24.0
Ruby LSP|shopify.ruby-lsp|Shopify|0.10.6
Lua|sumneko.lua|sumneko|3.19.1
Even Better TOML|tamasfe.even-better-toml|tamasfe|0.21.2
UV Toolkit|the0807.uv-toolkit|the0807|0.1.11
ShellCheck|timonwong.shellcheck|timonwong|0.39.5
Error Lens|usernamehw.errorlens|usernamehw|3.28.0
Gradle for Java|vscjava.vscode-gradle|vscjava|3.18.0
Debugger for Java|vscjava.vscode-java-debug|vscjava|0.59.0
Project Manager for Java|vscjava.vscode-java-dependency|vscjava|0.27.6
Extension Pack for Java|vscjava.vscode-java-pack|vscjava|0.31.1
Test Runner for Java|vscjava.vscode-java-test|vscjava|0.46.0
Maven for Java|vscjava.vscode-maven|vscjava|0.45.3
TODO Highlight|wayou.vscode-todo-highlight|wayou|1.0.5

A/B Experiments

```
vsliv368cf:30146710
pythonvspyt551cf:31249598
nativeloc1:31118317
dwcopilot:31158714
dwoutputs:31242946
copilot_t_ci:31333650
g012b348:31231168
pythonrdcb7:31268811
pythonpcpt1:31399616
6518g693:31302842
envsactivate1:31349248
editstats-enabled:31346256
cloudbuttont:31366566
3efgi100_wstrepl:31403338
cp_cls_t_966_ss:31526232
4je02754:31565972
8hhj4413:31478653
cp_cls_c_1081:31454833
conptydll_true:31485575
e9c30283:31453065
46204921:31447328
ei9d7968:31462942
hhf17803:31462392
h08i8180_copy:31475366
ddid_t:31478204
hmra_i5g22:31518061
bjc72774_agent_sandbox:31538428
7df3h592:31491241
cp_cls_t_1082:31535311
logging_enabled_new:31490725
jb_cp_cls_t_632:31543129
32d76977:31503652
ha629193:31508444
a1ije391_t:31533808
jbcp_cls_pctr_t:31531130
cp_intellij_t_nes:31548657
jf4hg949:31526829
hide-eh-duplicates:31543293
replace-eh-with-ah:31545853
ihg5j128:31534457
sandbox-ui-on-2:31543161
enable_editor_pane_layout:31551200
52258b4d:31547953
36h42362:31560305
c7c27ce7:31551212
1h923230:31564177
0dg73464:31554309
treatment-23-1:31555779
unuse_dynamic_mcp:31555281
0c1h4866:31562347
cch_brk_fls:31570145
5b8j3302:31564600
mangle-name-treatment:31568054
allow-signed-out:31574470
codex-agent-enabled:31566739
64a8d082:31573709
issue8950-e3349a92:31574958
39a5d156:31574988
ae8b2313:-9
2bfb8b39:31576696
permission_prompt_control:1332567
ccr_pr_nudge_adoption:1319471
vsc_wsm_t:1324223
eh853263:1370294
auto_mode_treatment:1367907
ce50c479:1367875

```

1. Create a new directory
2. Ensure it has at least a blank `jsconfig.json`
3. Trust the directory
4. Add a file with the contents:

```js
/**
* @typedef Inner
* @property {string} s the string
* @property {number} n the number
*/

/**
* @typedef Outer
* @property {[Inner]} inners
*/

/**
* @param {Outer} o
*/
function f(o) {

}

f({inners: [{n: 1, s: 'a'}, {n: 0}]})
```

Hover over the first `n`, see that it knows that it's a property and pulls in the description from the Inner typedef. Do the same with the second `n`, and see that it doesn't use the defined type.

This also affects autocomplete. Completions in the first element work fine, not in any others.