fix: handle property names with percent signs in JSON Pointers

[chatman-media]

Changes

Fixes #2251.

A schema property name containing a literal percent sign (e.g. "25%") crashes codegen with URIError: URI malformed whenever that property resolves to an object:

components:
  schemas:
    response:
      type: object
      properties:
        "25%":
          type: object
          properties:
            color:
              type: string

Root cause

createRef builds JSON Pointer paths by escaping each segment with Redocly's escapePointer, which escapes ~ and / but does not percent-encode. When a nested object is transformed, the accumulated path (e.g. #/components/schemas/response/25%) is fed back into parseRef, whose unescapePointer runs decodeURIComponent on each segment. decodeURIComponent("25%") throws URIError: URI malformed, crashing the whole run.

The same parseRef round-trip is used in several places (createRef, oapiRef, enum-name generation, discriminator property inference), so any of them could hit this with a %-containing key.

Fix

Add a small resilient parseRef wrapper (in src/lib/ts.ts) that delegates to Redocly's parseRef, but on failure falls back to parsing the pointer without decodeURIComponent — and per segment, only decodes when it can, otherwise returns the raw segment. This mirrors the asymmetry of escapePointer (which never percent-encodes), so:

• Literal % segments (e.g. 25%) pass through unchanged instead of throwing.
• Legitimately percent-encoded segments (e.g. %7Bid%7D -> {id}) still decode correctly.

All internal parseRef call sites now use this wrapper.

How to Review

• The behavioral regression test is in test/transform/schema-object/object.test.ts ("property name with percent sign (nested object)"). It throws URIError: URI malformed on main and passes with this change.
• Unit tests for the wrapper are in test/lib/ts.test.ts (describe("parseRef")): confirms normal parsing, percent-decoding, and no-throw on a bare %.
• pnpm test passes for the openapi-typescript package.

Checklist

• Unit tests updated
• docs/ updated (if necessary) — n/a
• pnpm run update:examples run — n/a (no example schema output changes)
• Changeset added (.changeset/percent-sign-property-name.md)

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