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using System.Text;
using System.Text.RegularExpressions;
using static NpgsqlRest.NpgsqlRestOptions;
namespace NpgsqlRest.TsClient;
public partial class TsClient(TsClientOptions options) : IEndpointCreateHandler
{
private IApplicationBuilder _builder = default!;
private NpgsqlRestOptions? _npgsqlRestoptions;
private const string Enabled = "tsclient";
private const string Module = "tsclient_module";
private const string SseEvents = "tsclient_events";
private const string IncludeParseUrl = "tsclient_parse_url";
private const string IncludeParseRequest = "tsclient_parse_request";
private const string IncludeStatusCode = "tsclient_status_code";
private const string ExportUrl = "tsclient_export_url";
private const string UrlOnly = "tsclient_url_only";
private const string Hooks = "tsclient_hooks";
// Resolved in the constructor so a misconfigured ReactQuery section fails fast at startup,
// when the handler is built - not silently at generation time.
private readonly TsClientReactQueryOptions _reactQuery = ValidateReactQuery(options.ReactQuery);
private static TsClientReactQueryOptions ValidateReactQuery(TsClientReactQueryOptions reactQuery)
{
if (reactQuery.Enabled && reactQuery.FilePath is null)
{
throw new ArgumentException(
"TsClientOptions.ReactQuery.Enabled is true but ReactQuery.FilePath is not set. " +
"Set ReactQuery.FilePath to the hooks output path (use the {0} placeholder for the module or schema name in multi-file mode).");
}
if (reactQuery.Enabled && string.IsNullOrWhiteSpace(reactQuery.ImportFrom))
{
throw new ArgumentException(
"TsClientOptions.ReactQuery.ImportFrom cannot be null or empty. " +
"It must be a module specifier that re-exports useQuery, useMutation, UseQueryOptions and UseMutationOptions " +
"with TanStack Query v5 semantics (default \"@tanstack/react-query\").");
}
return reactQuery;
}
public void Setup(IApplicationBuilder builder, NpgsqlRestOptions npgsqlRestoptions)
{
_builder = builder;
_npgsqlRestoptions = npgsqlRestoptions;
}
private int _filesCreated;
public void Cleanup(RoutineEndpoint[] endpoints)
{
if (options.FilePath is null)
{
return;
}
_filesCreated = 0;
// Hooks output is TypeScript-only in v1: with SkipTypes (plain JS client) the run proceeds
// without hooks generation instead of erroring.
var hooksEnabled = _reactQuery.Enabled;
if (hooksEnabled && options.SkipTypes)
{
Logger?.LogWarning("TsClient: ReactQuery hooks generation is TypeScript-only and SkipTypes is true. Skipping hooks generation for this run.");
hooksEnabled = false;
}
var containsModuleParam = endpoints.Any(e => e.CustomParameters?.ContainsKey(Module) is true);
if (!options.BySchema && containsModuleParam)
{
Run(endpoints, options.FilePath, hooksEnabled ? _reactQuery.FilePath : null);
}
else
{
if (!options.FilePath.Contains("{0}"))
{
Logger?.LogError("TsClient Option FilePath doesn't contain {{0}} formatter and BySchema options is true. Some files may be overwritten! Existing...");
return;
}
// Mirror the FilePath {0} rule for the hooks path; a misconfigured hooks path only
// disables hooks generation, it does not stop the client generation.
if (hooksEnabled && !_reactQuery.FilePath!.Contains("{0}"))
{
Logger?.LogError("TsClient Option ReactQuery.FilePath doesn't contain {{0}} formatter while generating multiple files (BySchema or module annotations). Skipping hooks generation for this run.");
hooksEnabled = false;
}
HashSet<string> processedModules = [];
if (containsModuleParam)
{
foreach (var group in endpoints.GroupBy(e => e.CustomParameters?.GetValueOrDefault(Module)))
{
if (group.Key is null)
{
continue;
}
if (!processedModules.Contains(group.Key))
{
processedModules.Add(group.Key);
}
var filename = string.Format(options.FilePath, group.Key);
if (options.SkipTypes && filename.EndsWith(".ts"))
{
filename = filename[..^3] + ".js";
}
Run([.. group], filename, hooksEnabled ? string.Format(_reactQuery.FilePath!, group.Key) : null);
}
}
foreach (var group in endpoints.GroupBy(e => e.Routine.Schema))
{
var filename = string.Format(options.FilePath, ConvertToCamelCase(group.Key));
if (options.SkipTypes && filename.EndsWith(".ts"))
{
filename = filename[..^3] + ".js";
}
RoutineEndpoint[] groupArray = [.. group.Where(g =>
(g.CustomParameters?.ContainsKey(Module) is false) ||
(g.CustomParameters?.GetValueOrDefault(Module) is null) ||
(!processedModules.Contains(g.CustomParameters?.GetValueOrDefault(Module) ?? ""))
)];
if (groupArray.Length == 0)
{
continue;
}
Run([.. groupArray], filename, hooksEnabled ? string.Format(_reactQuery.FilePath!, ConvertToCamelCase(group.Key)) : null);
}
}
if (_filesCreated > 0)
{
Logger?.LogDebug("TsClient: Created {count} {type} file(s)", _filesCreated, options.SkipTypes ? "JavaScript" : "TypeScript");
}
}
private void Run(RoutineEndpoint[] endpoints, string? fileName, string? hooksFileName = null)
{
if (fileName is null)
{
return;
}
// Internal-only endpoints have no public HTTP route (404), so a generated client function for one
// would be dead — e.g. a bare-`@mcp` MCP-only routine. Exclude them from the REST client.
RoutineEndpoint[] filtered = [.. endpoints.Where(e => e.InternalOnly is false && e.CustomParameters.ParameterEnabled(Enabled) is not false)];
// TanStack Query hooks entries collected while handling this module's endpoints:
// (generated function name, PascalCase name, GET = useQuery vs useMutation, takes a request object)
List<(string Camel, string Pascal, bool IsGet, bool HasRequest)> hookEntries = [];
Dictionary<string, string> modelsDict = [];
Dictionary<string, int> names = [];
// Track generated composite type interfaces to avoid duplicates
// Key: composite type identifier (schema.typename), Value: generated interface name
Dictionary<string, string> compositeTypeInterfaces = [];
StringBuilder contentHeader = new();
StringBuilder content = new();
StringBuilder interfaces = new();
StringBuilder compositeInterfaces = new();
bool needsStatusTypes = false;
// Plain `interface` (module-private inline / ambient in .d.ts) vs exported `export interface` (importable module).
var interfaceDecl = options.ExportTypes ? "export interface" : "interface";
foreach (var import in options.CustomImports)
{
contentHeader.AppendLine(import);
}
if (filtered.Where(e => e.RequestParamType == RequestParamType.QueryString).Any())
{
contentHeader.AppendLine(
options.ImportBaseUrlFrom is not null ?
string.Format("import {{ baseUrl }} from \"{0}\";", options.ImportBaseUrlFrom) :
string.Format("const baseUrl = \"{0}\";", GetHost()));
bool haveParseQuery = filtered
.Where(e => e.RequestParamType == RequestParamType.QueryString &&
e.Routine.ParamCount > 0 &&
e.Routine.ParamCount > (e.PathParameters?.Length ?? 0))
.Any();
if (haveParseQuery)
{
if (!options.SkipTypes)
{
contentHeader.AppendLine(options.ImportParseQueryFrom is not null ?
string.Format(
"import {{ parseQuery }} from \"{0}\";", options.ImportParseQueryFrom) :
"""
const parseQuery = (query: Record<any, any>) => "?" + Object.keys(query ? query : {})
.map(key => {
const value = (query[key] != null ? query[key] : "") as string;
if (Array.isArray(value)) {
return value.map((s: string) => s ? `${key}=${encodeURIComponent(s)}` : `${key}=`).join("&");
}
return `${key}=${encodeURIComponent(value)}`;
})
.join("&");
""");
}
else
{
contentHeader.AppendLine(options.ImportParseQueryFrom is not null ?
string.Format(
"import {{ parseQuery }} from \"{0}\";", options.ImportParseQueryFrom) :
"""
const parseQuery = query => "?" + Object.keys(query ? query : {})
.map(key => {
const value = query[key] != null ? query[key] : "";
if (Array.isArray(value)) {
return value.map(s => s ? `${key}=${encodeURIComponent(s)}` : `${key}=`).join("&");
}
return `${key}=${encodeURIComponent(value)}`;
})
.join("&");
""");
}
}
}
else
{
contentHeader.AppendLine(
options.ImportBaseUrlFrom is not null ?
string.Format("import {{ baseUrl }} from \"{0}\";", options.ImportBaseUrlFrom) :
string.Format("const baseUrl = \"{0}\";", GetHost()));
}
if (options.ExportUrls)
{
contentHeader.AppendLine();
}
bool handled = false;
var lastContentHeaderWasUrl = false;
foreach (var endpoint in filtered
.Where(e => e.Routine.Type == RoutineType.Table || e.Routine.Type == RoutineType.View)
.OrderBy(e => e.Routine.Schema)
.ThenBy(e => e.Routine.Type)
.ThenBy(e => e.Routine.Name))
{
if (Handle(endpoint) && !handled)
{
handled = true;
}
}
foreach (var endpoint in filtered
.Where(e => !(e.Routine.Type == RoutineType.Table || e.Routine.Type == RoutineType.View))
.OrderBy(e => e.Routine.Schema)
.ThenBy(e => e.Routine.Name))
{
if (Handle(endpoint) && !handled)
{
handled = true;
}
}
// Emit type aliases for error and result types when needed
if (needsStatusTypes && !options.SkipTypes)
{
var errorTypeBody = options.ErrorType.EndsWith(" | undefined")
? options.ErrorType[..^12]
: options.ErrorType;
contentHeader.AppendLine();
contentHeader.AppendLine($"type {options.ErrorTypeName} = {errorTypeBody};");
contentHeader.AppendLine($"type {options.ResultTypeName}<T> = {{status: number, response: T, error: {options.ErrorTypeName} | undefined}};");
}
if (!handled)
{
if (filtered.Length == 0 && options.FileOverwrite)
{
if (File.Exists(fileName))
{
try
{
File.Delete(fileName);
Logger?.LogTrace("Deleted file: {fileName}", fileName);
}
catch (Exception ex)
{
Logger?.LogError(ex, "Failed to delete file: {fileName}", fileName);
try
{
File.WriteAllText(fileName, "// No endpoints found.");
}
catch (Exception ex2)
{
Logger?.LogError(ex2, "Failed to empty file: {fileName}", fileName);
}
}
}
}
return;
}
if (!options.FileOverwrite && File.Exists(fileName))
{
return;
}
var dir = Path.GetDirectoryName(fileName);
if (dir is not null && !Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
// Insert composite type interfaces at the beginning of interfaces
if (compositeInterfaces.Length > 0)
{
interfaces.Insert(0, compositeInterfaces.ToString());
}
if (!options.CreateSeparateTypeFile)
{
if (!options.SkipTypes)
{
interfaces.AppendLine(content.ToString());
if (contentHeader.Length > 0)
{
contentHeader.AppendLine();
interfaces.Insert(0, contentHeader.ToString());
}
AddHeader(interfaces);
File.WriteAllText(fileName, interfaces.ToString());
_filesCreated++;
Logger?.LogTrace("Created Typescript file: {fileName}", fileName);
}
else
{
if (contentHeader.Length > 0)
{
content.Insert(0, contentHeader.ToString());
}
AddHeader(content);
File.WriteAllText(fileName, content.ToString());
_filesCreated++;
Logger?.LogTrace("Created Javascript file: {fileName}", fileName);
}
}
else
{
if (!options.SkipTypes)
{
// ExportTypes turns the separate file into an importable module (`{name}Types.ts` with `export interface`);
// otherwise it stays an ambient global declaration file (`{name}Types.d.ts`) referenced without an import.
var typeFile = fileName.Replace(".ts", options.ExportTypes ? "Types.ts" : "Types.d.ts");
if (options.ExportTypes)
{
var typeNames = ExtractExportedTypeNames(interfaces.ToString());
if (typeNames.Count > 0)
{
var moduleName = Path.GetFileNameWithoutExtension(typeFile);
contentHeader.Insert(0, $"import type {{ {string.Join(", ", typeNames)} }} from \"./{moduleName}\";{Environment.NewLine}");
}
}
AddHeader(interfaces);
File.WriteAllText(typeFile, interfaces.ToString());
Logger?.LogTrace("Created Typescript type file: {typeFile}", typeFile);
}
if (contentHeader.Length > 0)
{
content.Insert(0, contentHeader.ToString());
}
AddHeader(content);
File.WriteAllText(fileName, content.ToString());
if (!options.SkipTypes)
{
_filesCreated++;
Logger?.LogTrace("Created Typescript file: {fileName}", fileName);
}
else
{
_filesCreated++;
Logger?.LogTrace("Created Javascript file: {fileName}", fileName);
}
}
WriteHooks(hooksFileName, fileName, hookEntries);
return;
void AddHeader(StringBuilder sb)
{
if (options.HeaderLines.Count == 0)
{
return;
}
var now = DateTime.Now.ToString("O");
sb.Insert(0, string.Concat(string.Join(
Environment.NewLine,
options.HeaderLines.Select(l => string.Format(l, now).Trim())), Environment.NewLine)
);
}
bool Handle(RoutineEndpoint endpoint)
{
Routine routine = endpoint.Routine;
var eventsStreamingEnabled = endpoint.SseEventsPath is not null;
if (endpoint.CustomParameters.ParameterEnabled(SseEvents) is false)
{
eventsStreamingEnabled = false;
}
var includeParseUrlParam = endpoint.CustomParameters.ParameterEnabled(IncludeParseUrl) ?? options.IncludeParseUrlParam;
var includeParseRequestParam = endpoint.CustomParameters.ParameterEnabled(IncludeParseRequest) ?? options.IncludeParseRequestParam;
var includeStatusCode = endpoint.CustomParameters.ParameterEnabled(IncludeStatusCode) ?? options.IncludeStatusCode;
if (includeStatusCode)
{
needsStatusTypes = true;
}
var exportUrl = endpoint.CustomParameters.ParameterEnabled(ExportUrl) ?? options.ExportUrls;
var urlOnly = endpoint.CustomParameters.ParameterEnabled(UrlOnly) is true;
if (urlOnly)
{
exportUrl = true;
}
if (options.SkipRoutineNames.Contains(routine.Name))
{
return false;
}
if (options.SkipSchemas.Contains(routine.Schema))
{
return false;
}
if (options.SkipPaths.Contains(endpoint.Path))
{
return false;
}
string? name;
try
{
if (options.UseRoutineNameInsteadOfEndpoint)
{
name = options.IncludeSchemaInNames ? string.Concat(routine.Schema, "/", routine.Name) : routine.Name;
}
else
{
string pathName;
if (string.IsNullOrEmpty(_npgsqlRestoptions?.UrlPathPrefix) || _npgsqlRestoptions.UrlPathPrefix.Length > endpoint.Path.Length)
{
pathName = endpoint.Path;
}
else
{
pathName = endpoint.Path[_npgsqlRestoptions.UrlPathPrefix.Length..];
}
name = options.IncludeSchemaInNames ? string.Concat(routine.Schema, "/", pathName) : pathName;
}
}
catch
{
name = options.IncludeSchemaInNames ? string.Concat(routine.Schema, "/", routine.Name) : routine.Name;
}
if (name.Length < 3)
{
name = options.IncludeSchemaInNames ? string.Concat(routine.Schema, "/", routine.Name) : routine.Name;
}
var routineType = routine.Type;
var paramCount = routine.ParamCount;
//var paramTypeDescriptors = routine.ParamTypeDescriptor;
var isVoid = routine.IsVoid;
var returnsSet = routine.ReturnsSet;
var columnCount = routine.ColumnCount;
var returnsRecordType = routine.ReturnsRecordType;
var columnsTypeDescriptor = routine.ColumnsTypeDescriptor;
var returnsUnnamedSet = routine.ReturnsUnnamedSet;
if (endpoint.Login)
{
isVoid = false;
returnsSet = false;
columnCount = 1;
returnsRecordType = false;
columnsTypeDescriptor = [new TypeDescriptor("text")];
}
if (endpoint.Logout)
{
isVoid = true;
}
if (routineType == RoutineType.Table || routineType == RoutineType.View)
{
name = string.Concat(name, "-", endpoint.Method.ToString().ToLowerInvariant());
}
if (names.TryGetValue(name, out var count))
{
names[name] = count + 1;
name = string.Concat(name, "-", count);
}
else
{
names.Add(name, 1);
}
name = SanitizeJavaScriptVariableName(name);
var pascal = ConvertToPascalCase(name);
var camel = ConvertToCamelCase(name);
if (options.SkipFunctionNames.Contains(camel))
{
return false;
}
content.AppendLine();
string? requestName = null;
string[] paramNames = new string[paramCount];
// Parameters that are filled server-side and cannot be set by the client are omitted from the
// generated request shape when OmitAutomaticParameters is enabled (interface, query, body).
bool[] omitParam = new bool[paramCount];
int requestParamCount = 0;
string? bodyParameterName = null;
for (var i = 0; i < paramCount; i++)
{
var parameter = routine.Parameters[i];
var descriptor = parameter.TypeDescriptor;//paramTypeDescriptors[i];
if (options.OmitAutomaticParameters && endpoint.OmitParameterFromGeneratedRequest(parameter))
{
omitParam[i] = true;
continue;
}
requestParamCount++;
var nameSuffix = (descriptor.HasDefault || descriptor.CustomType is not null) ? "?" : "";
paramNames[i] = QuoteJavaScriptVariableName($"{parameter.ConvertedName}{nameSuffix}");
if (endpoint.IsBodyParameter(parameter))
{
// Use the bare converted name for emission — NOT paramNames[i], which carries the TS
// optional "?" suffix (e.g. "responseBody?"). That suffix is only for the interface
// property declaration; it must not leak into the runtime property name used for the
// body expression (request.responseBody) or the query-exclusion key (["responseBody"]).
bodyParameterName = parameter.ConvertedName;
}
}
string requestDesc = "";
if (requestParamCount > 0)
{
StringBuilder req = new();
requestName = $"I{pascal}Request";
requestDesc = string.Concat(requestDesc, "{");
var seenParamNames = new HashSet<string>(StringComparer.Ordinal);
for (var i = 0; i < paramCount; i++)
{
// Skip omitted (server-filled) parameters — their name was not assigned.
if (omitParam[i])
{
continue;
}
// Skip duplicate parameter names (e.g., when multiple HTTP custom types share field names)
if (!seenParamNames.Add(paramNames[i]))
{
continue;
}
var descriptor = routine.Parameters[i].TypeDescriptor;
var type = GetTsType(descriptor, false);
req.AppendLine($" {paramNames[i]}: {type} | null;");
requestDesc = string.Concat(requestDesc, $"{paramNames[i]}: {type} | null;");
}
requestDesc = string.Concat(requestDesc, "}");
if (modelsDict.TryGetValue(req.ToString(), out var newName))
{
requestName = newName;
}
else
{
if (!options.SkipTypes)
{
if (options.UniqueModels)
{
modelsDict.Add(req.ToString(), requestName);
}
req.Insert(0, $"{interfaceDecl} {requestName} {{{Environment.NewLine}");
req.AppendLine("}");
req.AppendLine();
interfaces.Append(req);
}
}
}
string responseName = "void";
bool json = false;
string? returnExp = null;
string GetReturnExp(string responseExp)
{
if (includeStatusCode)
{
var errorCast = options.SkipTypes
? options.ErrorExpression
: $"{options.ErrorExpression} as {options.ErrorTypeName}";
return string.Concat(
"return {",
Environment.NewLine,
" status: response.status,",
Environment.NewLine,
" response: ",
(responseExp == "await response.text()" ?
"response.ok ? " + responseExp + " : undefined!" :
string.Concat("response.ok ? ", responseExp, " : undefined!")),
",",
Environment.NewLine,
$" error: !response.ok && response.headers.get(\"content-length\") !== \"0\" ? {errorCast} : undefined",
Environment.NewLine,
" };");
}
return string.Concat("return ", responseExp, ";");
}
// proxy_out: always returns raw upstream response (function runs first, then proxies to upstream).
// proxy pass-through: when the routine is void, returns raw upstream response.
// Transform proxies (non-void @proxy routines) return processed data — fall through to normal handling.
if ((endpoint.IsProxyOut || (endpoint.IsProxy && routine.IsVoid)) && !urlOnly)
{
responseName = "Response";
returnExp = "return response;";
}
else if (routine.IsMultiCommand && routine.MultiCommandInfo is not null && !urlOnly)
{
// Multi-command SQL file: generate response interface with one property per command result
responseName = $"I{pascal}Response";
StringBuilder mcResp = new();
mcResp.AppendLine($"{interfaceDecl} {responseName} {{");
foreach (var cmdInfo in routine.MultiCommandInfo)
{
if (cmdInfo.IsSkipped) continue;
if (cmdInfo.ColumnCount == 0)
{
// Void command → rows affected count
mcResp.AppendLine($" {cmdInfo.Name}: number;");
}
else if (cmdInfo.ColumnCount == 1 && cmdInfo.ReturnsUnnamedSet)
{
// Single column with UnnamedSingleColumnSet — flat array or scalar with @single
var tsType = GetTsType(cmdInfo.ColumnTypeDescriptors[0], true);
var arraySuffix = cmdInfo.IsSingle ? "" : "[]";
mcResp.AppendLine($" {cmdInfo.Name}: {tsType}{arraySuffix};");
}
else if (cmdInfo.ColumnCount == 1)
{
// Single column — object array or object with @single
var tsType = GetTsType(cmdInfo.ColumnTypeDescriptors[0], true);
var arraySuffix = cmdInfo.IsSingle ? "" : "[]";
mcResp.AppendLine($" {cmdInfo.Name}: {{ {cmdInfo.ColumnNames[0]}: {tsType} }}{arraySuffix};");
}
else
{
// Multiple columns — inline object type array or object with @single
var fields = new StringBuilder();
for (int ci = 0; ci < cmdInfo.ColumnCount; ci++)
{
if (ci > 0) fields.Append(", ");
fields.Append(cmdInfo.ColumnNames[ci]);
fields.Append(": ");
fields.Append(GetTsType(cmdInfo.ColumnTypeDescriptors[ci], true));
}
var arraySuffix = cmdInfo.IsSingle ? "" : "[]";
mcResp.AppendLine($" {cmdInfo.Name}: {{ {fields} }}{arraySuffix};");
}
}
mcResp.AppendLine("}");
mcResp.AppendLine();
if (!options.SkipTypes)
{
interfaces.Append(mcResp);
}
returnExp = GetReturnExp($"await response.json() as {responseName}");
}
else if (!isVoid && !urlOnly)
{
if (endpoint.Upload)
{
responseName = $"I{pascal}Response";
StringBuilder resp = new();
resp.AppendLine($"{interfaceDecl} {responseName} {{");
resp.AppendLine(" type: string;");
resp.AppendLine(" fileName: string;");
resp.AppendLine(" contentType: string;");
resp.AppendLine(" size: number;");
resp.AppendLine(" success: boolean;");
resp.AppendLine(" status: string;");
resp.AppendLine(" [key: string]: string | number | boolean;");
resp.AppendLine("}");
resp.AppendLine();
interfaces.Append(resp);
responseName = string.Concat(responseName, "[]");
// Note: Don't set json = true here because upload endpoints use FormData,
// and the Content-Type header should be set automatically by the browser
if (!options.SkipTypes)
{
returnExp = GetReturnExp($"await response.json() as {responseName}");
}
else
{
returnExp = GetReturnExp("await response.json()");
}
}
else if (returnsSet == false && columnCount == 1 && !returnsRecordType)
{
var descriptor = columnsTypeDescriptor[0];
responseName = descriptor.IsJson ? "any" : GetTsType(descriptor, true);
if (descriptor.IsArray)
{
json = true;
//if (options.SkipTypes is false)
//{
// returnExp = GetReturnExp($"await response.json() as {responseName}[]");
//}
//else
//{
// returnExp = GetReturnExp("await response.json()");
//}
returnExp = GetReturnExp("await response.json()");
}
else
{
if (descriptor.IsDate || descriptor.IsDateTime)
{
returnExp = GetReturnExp("new Date(await response.text())");
}
else if (descriptor.IsNumeric)
{
returnExp = GetReturnExp("Number(await response.text())");
}
else if (descriptor.IsBoolean)
{
returnExp = GetReturnExp("await response.text() == \"t\"");
}
else if (descriptor.IsJson)
{
returnExp = GetReturnExp("await response.json()");
}
else
{
returnExp = GetReturnExp("await response.text()");
}
}
}
else
{
json = true;
if (returnsUnnamedSet)
{
if (columnCount > 0)
{
responseName = GetTsType(columnsTypeDescriptor[0], false);
}
else
{
responseName = "string[]";
}
}
else
{
StringBuilder resp = new();
responseName = $"I{pascal}Response";
// Check if nested JSON for composite types is enabled
// When false (default), composite fields are flattened in the JSON response
// When true, composite fields are nested under their column name
var useNestedCompositeTypes = endpoint.NestedJsonForCompositeTypes == true;
// Collect column indices to skip (expanded composite columns) - only when using nested types
HashSet<int> skipIndices = [];
if (useNestedCompositeTypes && routine.CompositeColumnInfo is not null)
{
foreach (var kvp in routine.CompositeColumnInfo)
{
// Skip all expanded column indices except the first one (which becomes the composite property)
foreach (var idx in kvp.Value.ExpandedColumnIndices.Skip(1))
{
skipIndices.Add(idx);
}
}
}
for (var i = 0; i < columnCount; i++)
{
// Skip expanded composite columns (only when nested types are enabled)
if (skipIndices.Contains(i))
{
continue;
}
// Check if this is a nested composite column - only generate nested interface when NestedJsonForCompositeTypes is true
if (useNestedCompositeTypes &&
routine.CompositeColumnInfo is not null &&
routine.CompositeColumnInfo.TryGetValue(i, out var compositeInfo))
{
// Generate interface for this composite type if not already done
var compositeInterfaceName = GetOrCreateCompositeInterface(
compositeInfo.FieldNames,
compositeInfo.FieldDescriptors,
compositeInfo.ConvertedColumnName,
compositeTypeInterfaces,
compositeInterfaces);
resp.AppendLine($" {compositeInfo.ConvertedColumnName}: {compositeInterfaceName} | null;");
continue;
}
// Check if this is an array of composite types
if (routine.ArrayCompositeColumnInfo is not null &&
routine.ArrayCompositeColumnInfo.TryGetValue(i, out var arrayCompositeInfo))
{
// Generate interface for this composite type if not already done
var compositeInterfaceName = GetOrCreateCompositeInterface(
arrayCompositeInfo.FieldNames,
arrayCompositeInfo.FieldDescriptors,
routine.ColumnNames[i],
compositeTypeInterfaces,
compositeInterfaces);
resp.AppendLine($" {routine.ColumnNames[i]}: {compositeInterfaceName}[] | null;");
continue;
}
var descriptor = columnsTypeDescriptor[i];
// SQL file composite type column: expand fields to match actual JSON response
if (descriptor.IsCompositeType &&
descriptor.CompositeFieldNames is not null &&
descriptor.CompositeFieldDescriptors is not null)
{
if (useNestedCompositeTypes)
{
// Nested mode: generate nested interface under column name
var compositeInterfaceName = GetOrCreateCompositeInterface(
descriptor.CompositeFieldNames,
descriptor.CompositeFieldDescriptors,
routine.ColumnNames[i],
compositeTypeInterfaces,
compositeInterfaces);
resp.AppendLine($" {routine.ColumnNames[i]}: {compositeInterfaceName} | null;");
}
else
{
// Flat mode: inline each composite field as a separate property
for (var fi = 0; fi < descriptor.CompositeFieldNames.Length; fi++)
{
var fieldName = ConvertToCamelCase(descriptor.CompositeFieldNames[fi]);
var fieldDescriptor = descriptor.CompositeFieldDescriptors[fi];
// Handle nested composite fields
if (fieldDescriptor.CompositeFieldNames is not null &&
fieldDescriptor.CompositeFieldDescriptors is not null)
{
var nestedInterfaceName = GetOrCreateCompositeInterface(
fieldDescriptor.CompositeFieldNames,
fieldDescriptor.CompositeFieldDescriptors,
fieldName,
compositeTypeInterfaces,
compositeInterfaces);
resp.AppendLine($" {fieldName}: {nestedInterfaceName} | null;");
}
else if (fieldDescriptor.ArrayCompositeFieldNames is not null &&
fieldDescriptor.ArrayCompositeFieldDescriptors is not null)
{
var nestedInterfaceName = GetOrCreateCompositeInterface(
fieldDescriptor.ArrayCompositeFieldNames,
fieldDescriptor.ArrayCompositeFieldDescriptors,
fieldName,
compositeTypeInterfaces,
compositeInterfaces);
resp.AppendLine($" {fieldName}: {nestedInterfaceName}[] | null;");
}
else
{
var fieldType = GetTsType(fieldDescriptor, false);
resp.AppendLine($" {fieldName}: {fieldType} | null;");
}
}
}
continue;
}
var type = GetTsType(descriptor, false);
if (descriptor.IsJson)
{
resp.AppendLine($" {routine.ColumnNames[i]}: any; // JSON");
}
else
{
resp.AppendLine($" {routine.ColumnNames[i]}: {type} | null;");
}
}
if (modelsDict.TryGetValue(resp.ToString(), out var newName))
{
responseName = newName;
}
else
{
if (!options.SkipTypes)
{
if (options.UniqueModels)
{
modelsDict.Add(resp.ToString(), responseName);
}
resp.Insert(0, $"{interfaceDecl} {responseName} {{{Environment.NewLine}");
resp.AppendLine("}");
resp.AppendLine();
interfaces.Append(resp);
}
}
}
if (returnsSet && !endpoint.ReturnSingleRecord)
{
responseName = string.Concat(responseName, "[]");
}
if (!options.SkipTypes)
{
returnExp = GetReturnExp($"await response.json() as {responseName}");
}
else
{
returnExp = GetReturnExp("await response.json()");
}
}
}
else
{
if (includeStatusCode)
{
var errorCast = options.SkipTypes
? options.ErrorExpression
: $"{options.ErrorExpression} as {options.ErrorTypeName}";
returnExp = string.Concat(
"return {",
Environment.NewLine,
" status: response.status,",
Environment.NewLine,
$" error: !response.ok && response.headers.get(\"content-length\") !== \"0\" ? {errorCast} : undefined",
Environment.NewLine,
" };");
}
}
string NewLine(string? input, int ident) =>
input is null ? "" : string.Concat(Environment.NewLine, string.Concat(Enumerable.Repeat(" ", ident)), input);
Dictionary<string, string> headersDict = [];
if (json)
{
headersDict.Add("Content-Type", "\"application/json\"");
}
if (eventsStreamingEnabled && _npgsqlRestoptions?.ExecutionIdHeaderName is not null)
{
headersDict.Add(_npgsqlRestoptions.ExecutionIdHeaderName, "executionId");
}
if (options.CustomHeaders.Count > 0)
{
foreach (var header in options.CustomHeaders)
{
if (string.IsNullOrEmpty(header.Value))
{
headersDict.Remove(header.Key);
}
else
{
headersDict[header.Key] = header.Value;
}
}
}
var body = endpoint.RequestParamType == RequestParamType.BodyJson && requestName is not null ?
@"body: JSON.stringify(request)" : null;
// For path parameters, we need to exclude them from the query string and from the body
var hasPathParams = endpoint.HasPathParameters;
var pathParamCount = endpoint.PathParameters?.Length ?? 0;
var bodyParamCount = bodyParameterName is not null ? 1 : 0;
// requestParamCount already excludes omitted (server-filled) parameters; path parameters are
// never omitted, so subtracting them and the body parameter yields the query parameter count.
var queryParamCount = requestParamCount - pathParamCount - bodyParamCount;
string qs;
if (endpoint.RequestParamType == RequestParamType.QueryString && requestName is not null && queryParamCount > 0)
{
if (hasPathParams || bodyParameterName is not null)
{
// Exclude path parameters and body parameter from query string
var exclusion = CreatePathParamExclusionExpression(
endpoint.PathParameters ?? [],
bodyParameterName);
qs = $" + parseQuery(({exclusion})";
}
else
{
qs = " + parseQuery(request)";
}
}
else
{
qs = "";
}
string? parameters = null;
List<(string name, string type, string desc)> paramComments = new();
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