Can't use custom themes that use ANSI colors

[jason0x43]

Description

Trying to load a theme that uses ANSI colors causes opencode to error.

TypeError: undefined is not an object (evaluating 'c3[mode2]')
    at resolveColor (src/cli/cmd/tui/context/theme.tsx:64:25)
    at <anonymous> (src/cli/cmd/tui/context/theme.tsx:67:18)
    at map (native:1:11)
    at resolveTheme (src/cli/cmd/tui/context/theme.tsx:66:57)
    at runComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:742:22)
    at updateComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:724:3)
    at readSignal (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:660:67)
    at get (src/cli/cmd/tui/context/theme.tsx:106:18)
    at <anonymous> (src/cli/cmd/tui/app.tsx:531:17)
    at runComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:742:22)...

OpenCode version

1.0.61

Steps to reproduce

1. Create a custom theme using the my-theme.json example
2. Change one of the color definitions to be a palette number, like "nord9": 9,.
3. Set the custom theme as the default in the opencode config
4. Start opencode and see error

Screenshot and/or share link

No response

Operating System

macOS 26.1

Terminal

kitty

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• Custom Themes Are Not Working in OpenTUI #4175: Both issues involve custom themes not working in OpenTUI after version 1.0+ upgrade. While Custom Themes Are Not Working in OpenTUI #4175 doesn't mention the specific TypeError, it could be the same underlying theme parsing issue with ANSI colors.

Feel free to ignore if none of these address your specific case.

[kommander]

This is not supported currently.

[jason0x43]

Drat. That was the reason I was excited about custom theme support being added back.

[kommander]

What are you trying to achieve? I may be supported at some point, but really can't tell when that would be. Maybe what you are trying to do can be done with what is available.

[jason0x43]

I have two main goals:

1. I want apps to react immediately to system appearance changes without me having to restart them.
2. I like apps to use my terminal palette so that I don't have to update a bunch of individual app themes if I ever change the palette.

I use a terminal theme named Selenized. One of its properties is that it swaps the white and black ends of the palette in light mode. If apps are configured properly, when my terminal switches from light to dark mode they'll handle the change transparently (they don't have to change themes or even be aware that anything happened).

I do use a truecolor theme in Neovim, but it's based on my terminal theme (at startup neovim dumps kitty's active colors and builds the theme from that), and it will dynamically react to system appearance changes.

[jason0x43]

Opencode's system theme does use the terminal palette (so it wouldn't be a huge extension to allow custom themes to do the same). However, the system theme makes some (reasonable) assumptions about the black and white palette slots that don't work well for me in light mode.

[kommander]

Yes, terminal palette is used and supported and we could expose that to the theme as well somehow. Automatic palette updates, if the terminal supports that, will be supported shortly as well.