Upgrade to TypeScript 7 (tsgo)

[ask-bonk]

Here's a summary of the TypeScript 7 upgrade:

Changes Made

package.json

• Added @typescript/native-preview: "beta" -- installs TypeScript 7.0 (tsgo) native compiler (v7.0.0-dev.20260421.2)
• Changed typescript to npm:@typescript/typescript6@^6.0.0 -- aliases the typescript package to TS6 compatibility package, so tooling that depends on the typescript programmatic API (vitest, wrangler, etc.) continues to work. This follows the recommended side-by-side approach from the TS7 blog post.
• Added "tsc": "tsgo" script -- maps bun run tsc to tsgo, so all existing CI commands (bun run tsc --noEmit) transparently invoke the TS7 native compiler without needing workflow file changes.

tsconfig.json

• Removed allowSyntheticDefaultImports: true -- in TS7, esModuleInterop is always assumed true and allowSyntheticDefaultImports cannot be set to false, making this setting redundant.
• Changed module from "es2022" to "esnext" -- aligns with TS7's new default. The es2022 value still works but esnext is the recommended default going forward.

Results

• Type checking: tsgo --noEmit passes with zero errors
• Tests: All 118 tests pass (2 test files)
• Lint: Clean (1 pre-existing warning unrelated to this change)

Workflow files -- no changes needed

The "tsc": "tsgo" script alias in package.json means both .github/workflows/test.yml (line 23: bun run tsc --noEmit) and .github/workflows/deps-update.yml (line 39: prompt referencing bun run tsc --noEmit) will automatically use tsgo without any modifications. This also avoids the workflows permission issue that blocked the previous attempt.

Closes #166

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	ask-bonk	e6e6cd8	Apr 22 2026, 10:57 AM