[Bug]: Crash: theme.style.keysHelpTip is not a function

[jacksonwelsh]

Describe the bug

tsp init crashes with the following error message:

TypeError: theme.style.keysHelpTip is not a function
    at file:///usr/local/lib/node_modules/@typespec/compiler/node_modules/@inquirer/checkbox/dist/index.js:176:34
    at file:///usr/local/lib/node_modules/@typespec/compiler/node_modules/@inquirer/core/dist/lib/create-prompt.js:81:38
    at store.handleChange (file:///usr/local/lib/node_modules/@typespec/compiler/node_modules/@inquirer/core/dist/lib/hook-engine.js:23:17)
    at cycle (file:///usr/local/lib/node_modules/@typespec/compiler/node_modules/@inquirer/core/dist/lib/hook-engine.js:25:19)
    at file:///usr/local/lib/node_modules/@typespec/compiler/node_modules/@inquirer/core/dist/lib/create-prompt.js:79:13
    at file:///usr/local/lib/node_modules/@typespec/compiler/node_modules/@inquirer/core/dist/lib/hook-engine.js:27:16
    at AsyncLocalStorage.run (node:internal/async_local_storage/async_context_frame:63:14)
    at withHooks (file:///usr/local/lib/node_modules/@typespec/compiler/node_modules/@inquirer/core/dist/lib/hook-engine.js:19:24)
    at prompt (file:///usr/local/lib/node_modules/@typespec/compiler/node_modules/@inquirer/core/dist/lib/create-prompt.js:72:16)
    at checkbox (file:///usr/local/lib/node_modules/@typespec/compiler/dist/src/init/prompts.js:4:12)

Reproduction

Freshly-installed @typespec/compiler, using node v24.11.1 on macOS Tahoe 26.1. No other typespec-related dependencies are installed on this system.

1. Run tsp init
2. select Generic REST API
3. Provide an application name
4. 💥

Checklist

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.

[jacksonwelsh]

Further details:

• Same crash happens when using the default application name
• Crash does not happen when selecting TypeSpec Emitter as the project template.

[timotheeguerin]

Seems to be a regression in 1.7.0.

You can use that as a workaround right now

npx -p @typespec/compiler@1.6.0 tsp init

[timotheeguerin]

1.7.1 was released with a fix!