[Gdm0714]

Summary

• Extract the key case-conversion mapping types from the toCamelCaseKeys / toConstantCaseKeys / toKebabCaseKeys / toPascalCaseKeys / toSnakeCaseKeys implementations into standalone public types under src/types/:
  • ToCamelCaseKeys
  • ToConstantCaseKeys
  • ToKebabCaseKeys
  • ToPascalCaseKeys
  • ToSnakeCaseKeys
• Re-export all five types from src/types/index.ts so they can be imported from es-toolkit
• Extract the shared NonPlainObject helper into src/_internal/NonPlainObject.ts to deduplicate it across the five implementations
• Add type tests (src/types/*.spec.ts) for each exported type
• Add reference docs for each type in all 4 languages (en/ko/ja/zh_hans) and list them in the types intro pages

Motivation

Users currently have to use ReturnType<typeof toCamelCaseKeys> to reference these types, which is verbose and fragile. Exporting them directly allows clean usage:

import type { ToCamelCaseKeys, ToSnakeCaseKeys } from 'es-toolkit';

Closes #1624

Test plan

• Existing object tests pass — runtime behavior is unchanged (types were only moved, not modified)
• New type tests for all five exported types pass

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Project	Deployment	Actions	Updated (UTC)
es-toolkit	Ready	Preview	Aug 16, 2026 6:59am

[Copilot]

Pull request overview

Exports previously-internal key-transform utility types so consumers can reference the resulting shapes directly (instead of using ReturnType<typeof ...>), aligning the public API with user needs raised in #1624.

Changes:

• Export ToCamelCaseKeys from src/object/toCamelCaseKeys.ts.
• Re-export ToCamelCaseKeys and ToSnakeCaseKeys from src/object/index.ts for top-level package access.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/object/toCamelCaseKeys.ts	Makes ToCamelCaseKeys a public exported type.
src/object/index.ts	Re-exports ToCamelCaseKeys / ToSnakeCaseKeys types from the object module entrypoint.

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