fix(typegen): preserve non-identifier keys in generated types

[nkgentile]

Summary

TypeGen now preserves non-identifier property keys by quoting them instead of transforming them to camelCase.

Before: "my-field" in GROQ → myField in generated types (didn't match runtime)
After: "my-field" in GROQ → "my-field" in generated types (matches runtime)

Valid JavaScript identifiers remain unquoted:

{
  _id: string;           // valid identifier - unquoted
  "my-field": string;    // invalid identifier - quoted
}

Property keys that aren't valid JS identifiers (kebab-case, spaces, leading digits, etc.) are now quoted instead of transformed to camelCase. Generated types now match runtime data.

Users accessing kebab-cased keys via camelCase will get type errors:

// Before: types didn't match runtime
result.myField  // TS valid, undefined at runtime

// After: types match runtime  
result["my-field"]  // both TS and runtime agree

Test plan

• Added comprehensive test covering valid identifiers (unquoted) and invalid identifiers (quoted)
• Updated existing test snapshots
• All 100 tests pass

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Project	Deployment	Review	Updated (UTC)
page-building-studio	Ready	Preview, Comment	Jan 8, 2026 9:44am
test-studio	Ready	Preview, Comment	Jan 8, 2026 9:44am

2 Skipped Deployments

Project	Deployment	Review	Updated (UTC)
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[github-actions]

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[github-actions]

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[sgulseth]

nice!

[github-actions]

⚡️ Editor Performance Report

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	44.51%	64324 / 144504
🔵	Statements	44.51%	64324 / 144504
🔵	Functions	48.02%	3375 / 7027
🔵	Branches	79.66%	13003 / 16323

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/@sanity/codegen/src/typescript/helpers.ts	96.92%	94.44%	100%	96.92%	76-77
packages/@sanity/codegen/src/typescript/schemaTypeGenerator.ts	96.89%	97.89%	100%	96.89%	104-110, 194-195

Generated in workflow #49519 for commit 730afd9 by the Vitest Coverage Report Action

[kbrabrand]

👏