Function resolveSessionPropertyType

scripts/codegen/csharp.ts:1141–1246

(
    propSchema: JSONSchema7,
    parentClassName: string,
    propName: string,
    isRequired: boolean,
    knownTypes: Map<string, string>,
    nestedClasses: Map<string, string>,
    enumOutput: string[]
)

}

function resolveSessionPropertyType(
    propSchema: JSONSchema7,
    parentClassName: string,
    propName: string,
    isRequired: boolean,
    knownTypes: Map<string, string>,
    nestedClasses: Map<string, string>,
    enumOutput: string[]
): string {
    if (isOpaqueJson(propSchema)) {
        return isRequired ? "JsonElement" : "JsonElement?";
    }
    // Handle $ref by resolving against schema definitions
    if (propSchema.$ref) {
        const className = typeToClassName(refTypeName(propSchema.$ref, sessionDefinitions));
        const refSchema = resolveRef(propSchema.$ref, sessionDefinitions);
        if (!refSchema) {
            return isRequired ? className : `${className}?`;
        }

        if (refSchema.enum && Array.isArray(refSchema.enum)) {
            const enumName = getOrCreateEnum(className, "", refSchema.enum as string[], enumOutput, refSchema.description, getEnumValueDescriptions(refSchema), undefined, isSchemaDeprecated(refSchema), isSchemaExperimental(refSchema));
            return isRequired ? enumName : `${enumName}?`;
        }

        if (refSchema.type === "object" && refSchema.properties) {
            if (!nestedClasses.has(className)) {
                nestedClasses.set(className, generateNestedClass(className, refSchema, knownTypes, nestedClasses, enumOutput));
            }
            return isRequired ? className : `${className}?`;
        }

        return resolveSessionPropertyType(refSchema, parentClassName, propName, isRequired, knownTypes, nestedClasses, enumOutput);
    }
    if (propSchema.anyOf) {
        const simpleNullable = getNullableInner(propSchema);
        if (simpleNullable) {
            return resolveSessionPropertyType(simpleNullable, parentClassName, propName, false, knownTypes, nestedClasses, enumOutput);
        }
        // Discriminated union: anyOf with multiple object variants sharing a const discriminator
        const nonNull = propSchema.anyOf.filter((s) => typeof s === "object" && s !== null && (s as JSONSchema7).type !== "null");
        if (nonNull.length > 1) {
            // Resolve $ref variants to their actual schemas
            const variants = (nonNull as JSONSchema7[]).map((v) => {
                if (v.$ref) {
                    const resolved = resolveRef(v.$ref, sessionDefinitions);
                    return resolved ?? v;
                }
                return v;
            });
            const discriminatorInfo = findDiscriminator(variants);
            if (discriminatorInfo) {
                const hasNull = propSchema.anyOf.length > nonNull.length;
                const baseClassName = (propSchema.title as string) ?? `${parentClassName}${propName}`;
                const renamedBase = applyTypeRename(baseClassName);
                const polymorphicCode = generateDiscriminatedUnionClass(baseClassName, discriminatorInfo, variants, knownTypes, nestedClasses, enumOutput, propSchema.description, undefined, isSchemaExperimental(propSchema), { sealLeafTypes: true });
                nestedClasses.set(renamedBase, polymorphicCode);
                return isRequired && !hasNull ? renamedBase : `${renamedBase}?`;