Resolving top-level $ref fails with TypeError: Converting circular structure to JSON #382
Description
When using $ref on the top-level to reference a defined type in $defs it wrongly results in a TypeError: Converting circular structure to JSON which is not a circular reference.
According to the JSON Schema Core Specification Draft 2020-12 (see 7.5. Applicators) it is valid to use $ref on the top-level.
Here's a example schema:
{ "$schema": "https://json-schema.org/draft/2020-12/schema", "$ref": "#/$defs/TopLevelType", "$defs": { "PropType": { "title": "Property", "type": "string" }, "TopLevelType": { "properties": { "prop1": { "$ref": "#/$defs/PropType" } }, "title": "Top Level Type", "type": "object" } } }Trying to resolve this issue using the following test program:
import $RefParser from "@apidevtools/json-schema-ref-parser"; import mySchema from "./bundler-demo-non-working.json" with { type: "json" }; try { await $RefParser.dereference(mySchema); const clonedSchema = await $RefParser.dereference(mySchema, { mutateInputSchema: false }); console.log(clonedSchema); } catch (err) { console.error(err); }Results in the following error:
node test.js TypeError: Converting circular structure to JSON --> starting at object with constructor 'Object' | property 'TopLevelType' -> object with constructor 'Object' | property 'properties' -> object with constructor 'Object' | property 'prop1' -> object with constructor 'Object' --- property '$defs' closes the circle at JSON.stringify (<anonymous>) at normalizeArgs (node_modules/@apidevtools/json-schema-ref-parser/dist/lib/normalize-args.js:46:34) at $RefParser.dereference (node_modules/@apidevtools/json-schema-ref-parser/dist/lib/index.js:193:54) at Object.dereference (node_modules/@apidevtools/json-schema-ref-parser/dist/lib/index.js:190:37) at file://test.js:6:41It has been reproduced with version 12.0.1 of @apidevtools/json-schema-ref-parser.
The resolution of this issue is required for skriptfabrik/json-schema-bundler#28.