Function emitGoUntaggedUnionInterface

scripts/codegen/go.ts:2711–2763

(typeName: string, schema: JSONSchema7, ctx: GoCodegenCtx, variants?: GoUntaggedUnionVariant[])

}

function emitGoUntaggedUnionInterface(typeName: string, schema: JSONSchema7, ctx: GoCodegenCtx, variants?: GoUntaggedUnionVariant[]): boolean {
    if (ctx.generatedNames.has(typeName)) return true;
    variants ??= goUntaggedUnionVariants(typeName, schema, ctx);
    if (!variants) return false;

    ctx.generatedNames.add(typeName);
    const unmarshalFuncName = goUnexportedFunctionName("unmarshal", typeName);
    const markerName = toGoUnexportedIdentifier(typeName);
    ctx.discriminatedUnions.set(typeName, { typeName, unmarshalFuncName });

    const lines: string[] = [];
    if (schema.description) {
        pushGoCommentForContext(lines, schema.description, ctx);
    }
    if (isSchemaExperimental(schema)) {
        pushGoExperimentalTypeComment(lines, typeName, ctx);
    }
    if (isSchemaDeprecated(schema)) {
        pushGoCommentForContext(lines, `Deprecated: ${typeName} is deprecated and will be removed in a future version.`, ctx);
    }
    lines.push(`type ${typeName} interface {`);
    lines.push(`\t${markerName}()`);
    lines.push(`}`);

    for (const variant of [...variants].sort((left, right) => compareGoTypeNames(left.typeName, right.typeName))) {
        lines.push(``);
        if (variant.typeDefinition) {
            lines.push(variant.typeDefinition);
            lines.push(``);
        }
        lines.push(`func (${variant.typeName}) ${markerName}() {}`);
    }

    const unmarshalLines: string[] = [];
    unmarshalLines.push(`func ${unmarshalFuncName}(data []byte) (${typeName}, error) {`);
    unmarshalLines.push(`\tif string(data) == "null" {`);
    unmarshalLines.push(`\t\treturn nil, nil`);
    unmarshalLines.push(`\t}`);
    for (const variant of variants) {
        unmarshalLines.push(`\t{`);
        unmarshalLines.push(`\t\tvar value ${variant.goType}`);
        unmarshalLines.push(`\t\tif err := json.Unmarshal(data, &value); err == nil {`);
        unmarshalLines.push(`\t\t\treturn ${variant.returnExpr}, nil`);
        unmarshalLines.push(`\t\t}`);
        unmarshalLines.push(`\t}`);
    }
    unmarshalLines.push(`\treturn nil, errors.New("data did not match any union variant for ${typeName}")`);
    unmarshalLines.push(`}`);
    pushGoEncodingBlock(unmarshalLines, ctx);

    ctx.structs.push(lines.join("\n"));
    return true;
}

function planGoUnion(typeName: string, schema: JSONSchema7, ctx: GoCodegenCtx, includeWrapper: boolean = false): GoUnionPlan | undefined {
    const members = goNonNullUnionMembers(schema);