function getDiagnosticsForOneOfSchema()

in src/validation/utils/getDiagnosticsForNode.ts [54:103]
40 lines of code
8 McCabe index (conditional complexity)

function getDiagnosticsForOneOfSchema(
    rootNode: ObjectASTNode,
    document: TextDocument,
    schemaPart: SchemaObject,
    oneOfSchema: string,
) {
    const mutuallyExclusiveProperties: unknown = referenceTypes[oneOfSchema]
    const mutuallyExclusivePropertiesPresent: { propNode: PropertyASTNode, schemaValue: unknown }[] = []
    let diagnostics: Diagnostic[] = []

    rootNode.properties.forEach(prop => {
        if (!isObject(mutuallyExclusiveProperties)) {
            return
        }

        const propName = prop.keyNode.value
        const propertySchema = mutuallyExclusiveProperties[propName]

        // If the property is one of mutually exclusive properties
        if (propertySchema) {
            mutuallyExclusivePropertiesPresent.push({ propNode: prop, schemaValue: propertySchema})
        // If the property is neither in the set nor in the schema props
        } else if (!schemaPart[propName]) {
            diagnostics.push(
                getPropertyNodeDiagnostic(prop, document, MESSAGES.INVALID_PROPERTY_NAME)
            )
        }
    })

    // if there is more than one item mark them all as invalid
    if (mutuallyExclusivePropertiesPresent.length > 1) {
        mutuallyExclusivePropertiesPresent.forEach(oneOfProp => {
            diagnostics.push(
                getPropertyNodeDiagnostic(oneOfProp.propNode, document, MESSAGES.MUTUALLY_EXCLUSIVE_CHOICE_PROPERTIES)
            )
        })
    // if there is only one item and it is an object
    // recursively continue on with validation
    } else if (mutuallyExclusivePropertiesPresent.length) {
        const { schemaValue, propNode } = mutuallyExclusivePropertiesPresent[0]
        const { valueNode } = propNode
        if (valueNode && isObject(schemaValue)) {
            diagnostics = diagnostics.concat(
                getDiagnosticsForNode(valueNode, document, schemaValue as SchemaObject)
            )
        }
    }

    return diagnostics
}