Fix empty string enum members with --enum

[cyphercodes]

Changes

Fixes #2807.

When --enum encounters an empty string enum value, the enum member name is now emitted as a string-literal member ("" = "") instead of an empty identifier.

Added regression coverage for both the low-level tsEnum helper and a schema transform matching the reported query-parameter enum case.

How to Review

Check tsEnumMember() handling for empty member names and the new enum transform regression. The generated enum should be valid TypeScript:

export enum PathsTestGetParametersQueryType {
    "" = "",
    foo = "foo",
    bar = "bar"
}

Checklist

• Unit tests updated
• docs/ updated (not necessary)
• pnpm run update:examples run (not applicable; no example snapshots changed)

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🦋 Changeset detected

Latest commit: ad21cb2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
openapi-typescript	Patch

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