Function registerGoExternalUnionUnmarshalers

scripts/codegen/go.ts:1070–1119

(
    schema: JSONSchema7,
    ctx: GoCodegenCtx,
    externalSchemas?: Record<string, JSONSchema7>
)

}

function registerGoExternalUnionUnmarshalers(
    schema: JSONSchema7,
    ctx: GoCodegenCtx,
    externalSchemas?: Record<string, JSONSchema7>
): void {
    if (!externalSchemas) return;

    const externalRefs = collectExternalSchemaRefNames(schema);
    for (const [schemaFile, refNames] of externalRefs) {
        const externalSchema = externalSchemas[schemaFile];
        const externalImport = EXTERNAL_SCHEMA_GO_IMPORT[schemaFile];
        if (!externalSchema || !externalImport || externalImport.packageName !== ctx.packageName) continue;

        const externalDefinitions = collectDefinitionCollections(externalSchema as Record<string, unknown>);
        const definitions: Record<string, JSONSchema7> = {
            ...Object.fromEntries(
                Object.entries(externalDefinitions.$defs ?? {}).filter(([, value]) => typeof value === "object" && value !== null)
            ) as Record<string, JSONSchema7>,
            ...Object.fromEntries(
                Object.entries(externalDefinitions.definitions ?? {}).filter(([, value]) => typeof value === "object" && value !== null)
            ) as Record<string, JSONSchema7>,
        };
        const planningCtx: GoCodegenCtx = {
            structs: [],
            encoding: [],
            enums: [],
            enumsByName: new Map(),
            discriminatedUnions: new Map(),
            generatedNames: new Set(),
            definitions: externalDefinitions,
            wrapComments: ctx.wrapComments,
            discriminatedUnionRawVariantSuffix: ctx.discriminatedUnionRawVariantSuffix,
            packageName: ctx.packageName,
        };

        for (const refName of refNames) {
            const definition = definitions[refName];
            if (!definition) continue;

            const typeName = goDefinitionName(refName);
            const plan = planGoUnion(typeName, definition, planningCtx, true);
            if (!plan || plan.kind === "flattenedObject" || plan.kind === "wrapper") continue;

            ctx.discriminatedUnions.set(typeName, {
                typeName,
                unmarshalFuncName: goUnexportedFunctionName("unmarshal", typeName),
            });
        }
    }
}

function pushGoStructUnmarshalJSON(lines: string[], typeName: string, fields: GoStructField[], ctx: GoCodegenCtx): void {
    const unionFields = fields