IntelliSense keyword completion doesn't work in Foundry projects and extension tries to load removed hardhat/register from Hardhat 3

[billalxcode]

Environment

• VS Code: 1.130.0
• Extension: Solidity by Nomic Foundation v0.8.29
• OS: macOS (Apple Silicon)
• Node.js: v24.10.0
• Foundry: 1.7.1
• Hardhat: 3.11.1

Description

I'm using a standard Foundry project.

Import completion works correctly, for example:

import "@openzeppelin/contracts/access/Ownable.sol";

However, basic Solidity keyword/type completion does not work at all.

Examples that don't appear in completion:

• contract
• interface
• library
• struct
• enum
• address
• uint256
• mapping
• event
• modifier

Pressing Ctrl+Space also shows no language-server suggestions for these keywords.

Other language features continue to work:

• ✅ Import path completion
• ✅ Go to Definition
• ✅ Workspace indexing
• ❌ Keyword/type completion

---

Reproduction

forge init test-lsp
cd test-lsp

forge install OpenZeppelin/openzeppelin-contracts

code .

Install:

• Solidity by Nomic Foundation v0.8.29

Open src/Counter.sol.

Type:

con

Expected:

contract

Actual:

No completion is shown.

---

Language Server Output

[indexing] Found projects:
- Type: Foundry
  Base path: .../test-lsp

- Type: Hardhat
  Base path: .../test-lsp/lib/openzeppelin-contracts
  Config file: .../lib/openzeppelin-contracts/hardhat.config.js

[openzeppelin-contracts] Error loading HRE:
Cannot find module '/.../node_modules/hardhat/register.js'

[indexing] Scan complete, 486 sol files found
[indexing] Analyzing 1 solidity files
[indexing] Finished analyzing

---

Additional Information

The extension appears to detect lib/openzeppelin-contracts as a Hardhat project because the dependency contains a hardhat.config.js.

However, the extension then attempts to load:

hardhat/register

Hardhat 3 no longer exports this entrypoint.

Verification:

node -p "require.resolve('hardhat/register')"

returns

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]:
Package subpath './register' is not defined by "exports"

while

node -p "require.resolve('hardhat')"

correctly returns

.../node_modules/hardhat/dist/src/index.js

Hardhat version:

3.11.1

Its package exports do not include ./register.

---

Notes

I'm not sure whether the missing keyword completion is directly caused by the failed Hardhat initialization, but the two issues consistently occur together in a clean Foundry project.

The project itself is otherwise functional:

• Forge builds successfully.
• Import completion works.
• Go to Definition works.
• Only keyword/type IntelliSense appears to be missing.