Function findGoRequiredFieldDiscriminator

scripts/codegen/go.ts:682–719

(
    variants: JSONSchema7[],
    ctx: GoCodegenCtx,
    unionTypeName: string
)

}

function findGoRequiredFieldDiscriminator(
    variants: JSONSchema7[],
    ctx: GoCodegenCtx,
    unionTypeName: string
): GoRequiredFieldDiscriminatorInfo | null {
    if (variants.length === 0) return null;

    const objectVariants = variants.map((variantSource) => ({
        source: variantSource,
        schema: goObjectUnionMemberSchema(variantSource, ctx),
    }));
    if (objectVariants.some((variant) => variant.schema === undefined)) return null;

    const requiredSets = objectVariants.map((variant) => new Set(variant.schema!.required || []));
    const propertySets = objectVariants.map((variant) => new Set(Object.keys(variant.schema!.properties || {})));
    const unionVariants: GoDiscriminatedUnionVariant[] = [];
    const seenTypeNames = new Set<string>();
    for (const [index, variant] of objectVariants.entries()) {
        const required = requiredSets[index];
        if (required.size === 0) return null;

        const uniqueRequired = [...required]
            .filter((propName) => !propertySets.some((peerProperties, peerIndex) => peerIndex !== index && peerProperties.has(propName)))
            .sort(compareGoFieldNames);
        if (uniqueRequired.length === 0) return null;

        const typeName = goDiscriminatedUnionVariantTypeName(unionTypeName, uniqueRequired[0], variant.source, variant.schema!, ctx);
        if (seenTypeNames.has(typeName)) return null;
        seenTypeNames.add(typeName);
        unionVariants.push({
            schema: variant.schema!,
            typeName,
            discriminatorValues: uniqueRequired,
        });
    }

    return { variants: unionVariants };
}

/**
 * Get or create a Go enum type, deduplicating by type name (not by value set).