fix: quote slice IDs in generated slice index files when necessary

[angeloashmore]

Resolves:

Description

The generated slice index file writes slice IDs as bare object keys. An ID that is not a valid JavaScript identifier (e.g. my-slice) makes the whole file invalid JavaScript. The API accepts such IDs, so a prismic pull can deliver them and break a project's build.

Checklist

• A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

A generated index file with a normal ID (hero) and an ID that is not a valid identifier (legacy-hero):

// Code generated by Prismic. DO NOT EDIT.

import Hero from "./Hero";
import LegacyHero from "./LegacyHero";

export const components = {
	hero: Hero,
	"legacy-hero": LegacyHero
};

Before this PR, the legacy-hero entry was written as legacy-hero: LegacyHero, which is a syntax error.

How to QA ¹

1. Run prismic slice create MySlice --id my-slice.
2. Open the slice index file. Make sure that the entry is "my-slice": MySlice and that the file is valid JavaScript.
3. Create a slice with a normal snake_case ID. Make sure that its key has no quotes.

🤖 Generated with Claude Code

---

Note

Low Risk
Scoped to CLI code generation and tests; valid identifier IDs behave as before with no runtime auth or data-path changes.

Overview
Generated slice library index files now emit valid JavaScript object keys for slice IDs that are not legal identifiers (e.g. hyphenated IDs like legacy-hero).

A shared formatObjectKey helper leaves normal identifiers unquoted and uses JSON.stringify for everything else. Next.js, Nuxt, and SvelteKit adapters use it when building the components map in createSliceIndexFile.

Test support was updated so slice-index assertions accept quoted keys, and a slice create test checks that non-identifier IDs appear quoted in slices/index.js.

^{Reviewed by Cursor Bugbot for commit 18330d7. Bugbot is set up for automated code reviews on this repo. Configure here.}

Footnotes

1. Please use these labels when submitting a review:
   ❓ #ask: Ask a question.
   💡 #idea: Suggest an idea.
   ⚠️ #issue: Strongly suggest a change.
   🎉 #nice: Share a compliment. ↩

[lihbr]

Very minor suggestion, looks good otherwise :)

[lihbr]

✨ #suggestion: I find it a bit hard to link here that the slice ID coming from buildSlice has to be quoted. Essentially, this test breaks if we change buildSlice's ID to sliceS${id} (hypen removed)