Function resolvePropertyTypes

src/typescript/objectish.ts:40–71

(
  program: ts.Program,
  type: ts.Type
)

}

export function resolvePropertyTypes(
  program: ts.Program,
  type: ts.Type
): { [key: string]: ts.Type } | null {
  if (type.isIntersection()) {
    return type.types.reduce<{ [key: string]: ts.Type }>(
      // TODO: Don't just override previous property type
      (reduced, subType) => ({
        ...reduced,
        ...resolvePropertyTypes(program, subType)
      }),
      {}
    )
  }

  if (!isObjectType(type)) return null

  const inheritedTypes: ts.BaseType[] =
    type.objectFlags & ts.ObjectFlags.Interface
      ? (type as ts.InterfaceType).getBaseTypes() || []
      : []

  const inheritedObjectTypes = inheritedTypes.filter(isObjectType) as ts.ObjectType[]

  return [...inheritedObjectTypes, type].reduce(
    (propertiesObject, someType) => ({
      ...propertiesObject,
      ...getObjectTypeProperties(program, someType)
    }),
    {}
  )
}

export function mapPropertyTypesToSchemaDescriptor(propTypes: {
  [key: string]: ts.Type