Install Fails with Syntax Error on WSL

[C-Ross]

Description

sudo npm i -g opencode-ai@latest
npm ERR! code 1
npm ERR! path /usr/local/lib/node_modules/opencode-ai
npm ERR! command failed
npm ERR! command sh -c node ./postinstall.mjs
npm ERR! file:///usr/local/lib/node_modules/opencode-ai/postinstall.mjs:25
npm ERR! const platform = platformMap[os.platform()] ?? os.platform()
npm ERR! ^
npm ERR!
npm ERR! SyntaxError: Unexpected token '?'
npm ERR! at Loader.moduleStrategy (internal/modules/esm/translators.js:133:18)
npm ERR! at async link (internal/modules/esm/module_job.js:42:21)

npm ERR! A complete log of this run can be found in:
npm ERR! /root/.npm/_logs/2026-05-25T12_30_15_575Z-debug-0.log

Plugins

No response

OpenCode version

1.15.10 (opencode-ai@latest)

Steps to reproduce

sudo npm i -g opencode-ai@latest

npm --version
8.5.1

node --version
v12.22.9

Screenshot and/or share link

No response

Operating System

Ubuntu 22.04.5 LTS (GNU/Linux 6.6.114.1-microsoft-standard-WSL2 x86_64)

Terminal

Windows Terminal

[github-actions]

This issue might be a duplicate of or related to an existing issue. Please check:

• [Bug] Global installation with npm fails due to SyntaxError in postinstall.js #119: Similar SyntaxError in postinstall script due to an outdated Node.js version (closed, but describes the same root cause — Node.js is too old to support modern JavaScript syntax used in the postinstall script)

Your Node.js version (v12.22.9) does not support the nullish coalescing operator (??) introduced in Node.js 14. Upgrading Node.js to v14 or later should resolve the installation error.

[C-Ross]

1.14.* worked.

sudo npm i -g opencode-ai@1.14.*

added 5 packages, and audited 6 packages in 15s

found 0 vulnerabilities

[FurryWolfX]

postinstall.mjs uses syntax not supported by Node v12.22.9. You need to update Node.

[C-Ross]

Looks like node is the latest for my LTS version, so I will accept 1.14.* for now, thanks.