fix(cli): guard importAlias type before string operations

[okxint]

What

Fixes a TypeError crash when --import-alias is passed without a value in CI mode (--CI).

Root cause

--import-alias is declared as [alias] (optional value) in Commander. When passed bare with --CI, Commander coerces it to the boolean true instead of a string. The CI path skips the interactive prompt, so importAlias stays as true. Downstream:

• index.ts compares importAlias !== "~/" — true !== "~/" passes, so the invalid value flows through
• setImportAlias.ts calls .replace() on it → TypeError: Cannot read properties of undefined

Fix

Two defensive guards:

// cli/src/index.ts
- if (importAlias !== "~/") {
+ if (typeof importAlias === "string" && importAlias !== "~/") {

// cli/src/helpers/setImportAlias.ts
  export const setImportAlias = (projectDir: string, importAlias: string) => {
+   if (typeof importAlias !== "string") return;

Fixes #2215

[changeset-bot]

⚠️ No Changeset found

Latest commit: 6971f61

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
create-t3-app	Ready	Preview, Comment	Jul 4, 2026 5:31am