Unify API into a normalized presentation with all reference resolved, allOf combiners merged and other aspects unified.

Supports OpenAPI and GraphQL specifications processing.

Modified version of udamir/allof-merge

• Added cycles support during combiners resolve
• Added origins support- it is now possible for any value in the unified JSO to track its origins in the source specification
• Store original ref for the object if the object was resolved from ref
• Gathered various API unification adapters from different libraries in the stack to a single place
• Support data structure hash calculation
• Process different phases sequentially (reference resolving, allOf merge, unification)
• Support synthetic any and nothing type for OAS
• Added deprecated items calculation
• Support new graphapi format
• Feature flags added to control behavior during processing
• Added a large number of tests
• Debug tooling for cycled JSO

• Safe merging of schemas combined with allOf in whole document
• Fastest implementation - up to x3 times faster then other popular libraries
• Merged schema does not validate more or less than the original schema
• Removes almost all logical impossibilities
• Correctly merge additionalProperties, patternProperties and properties taking into account common validations
• Correctly merge items and additionalItems taking into account common validations
• Supports custom rules to merge other document types and JsonSchema versions
• Supports input with circular references (javaScript references)
• Supports $refs and circular $refs either (internal references only)
• Correctly merge of $refs with sibling content (optionally)
• Correctly merge of combiners (anyOf, oneOf) with sibling content (optionally)
• Typescript syntax support out of the box
• No dependencies (except json-crawl), can be used in NodeJS or browser

• JsonSchema
• OpenApi 3.x
• GraphApi
• Swagger 2.x (roadmap)
• AsyncApi 2.x (roadmap)
• AsyncApi 3.x (roadmap)

There are some libraries that can merge schemas combined with allOf. One of the most popular is mokkabonna/json-schema-merge-allof, but it has some limitatons: Does not support circular $refs and no Typescript syntax out of the box.

If schema contains an external $ref, you should bundle it via api-ref-bundler first.