[Flight] Allow passing DEV only startTime as an option (#34912)

When you use the `createFromFetch` API we assume that the start time of
the request is the same time as when you call `createFromFetch` but in
principle you could use it with a Promise that starts earlier and just
happens to resolve to a `Response`.
When you use `createFromReadableStream` that is almost definitely the
case. E.g. you might have started it way earlier and you don't call
`createFromReadableStream` until you get the headers back (the fetch
promise resolves).
This adds an option to pass in the start time for debug purposes if you
started the request before starting to parse it.

Author: sebmarkbage

packages/react-client/src/ReactFlightClient.js

@@ -2561,6 +2561,7 @@ function ResponseInstance(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ){
 constchunks: Map<number,SomeChunk<any>>=newMap();
@@ -2621,7 +2622,8 @@ function ResponseInstance(
 // Note: createFromFetch allows this to be marked at the start of the fetch
 // where as if you use createFromReadableStream from the body of the fetch
 // then the start time is when the headers resolved.
-this._debugStartTime=performance.now();
+this._debugStartTime=
+debugStartTime==null ? performance.now() : debugStartTime;
 this._debugIOStarted=false;
 // We consider everything before the first setTimeout task to be cached data
 // and is not considered I/O required to load the stream.
@@ -2669,6 +2671,7 @@ export function createResponse(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ): WeakResponse{
 returngetWeakResponse(
@@ -2684,6 +2687,7 @@ export function createResponse(
 findSourceMapURL,
 replayConsole,
 environmentName,
+debugStartTime,
 debugChannel,
 ),
 );

packages/react-markup/src/ReactMarkupServer.js

@@ -91,6 +91,9 @@ export function experimental_renderToHTML(
 undefined,
 undefined,
 false,
+undefined,
+undefined,
+undefined,
 );
 conststreamState=createFlightStreamState(flightResponse,null);
 constflightDestination={

packages/react-server-dom-esm/src/client/ReactFlightDOMClientBrowser.js

@@ -52,6 +52,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -103,6 +104,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-esm/src/client/ReactFlightDOMClientNode.js

@@ -57,6 +57,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -112,6 +113,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientBrowser.js

@@ -129,6 +129,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }
@@ -205,6 +208,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 exportfunctioncreateFromReadableStream<T>(

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -107,6 +108,9 @@ function createResponseFromOptions(options?: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientNode.js

@@ -52,6 +52,7 @@ export type Options = {
 encodeFormAction?: EncodeFormActionCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -103,6 +104,9 @@ export function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientBrowser.js

@@ -51,6 +51,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -102,6 +103,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -109,6 +110,9 @@ function createResponseFromOptions(options: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientNode.js

@@ -60,6 +60,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -114,6 +115,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-client/src/ReactFlightClient.js

@@ -2561,6 +2561,7 @@ function ResponseInstance(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ){
 constchunks: Map<number,SomeChunk<any>>=newMap();
@@ -2621,7 +2622,8 @@ function ResponseInstance(
 // Note: createFromFetch allows this to be marked at the start of the fetch
 // where as if you use createFromReadableStream from the body of the fetch
 // then the start time is when the headers resolved.
-this._debugStartTime=performance.now();
+this._debugStartTime=
+debugStartTime==null ? performance.now() : debugStartTime;
 this._debugIOStarted=false;
 // We consider everything before the first setTimeout task to be cached data
 // and is not considered I/O required to load the stream.
@@ -2669,6 +2671,7 @@ export function createResponse(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ): WeakResponse{
 returngetWeakResponse(
@@ -2684,6 +2687,7 @@ export function createResponse(
 findSourceMapURL,
 replayConsole,
 environmentName,
+debugStartTime,
 debugChannel,
 ),
 );

packages/react-markup/src/ReactMarkupServer.js

@@ -91,6 +91,9 @@ export function experimental_renderToHTML(
 undefined,
 undefined,
 false,
+undefined,
+undefined,
+undefined,
 );
 conststreamState=createFlightStreamState(flightResponse,null);
 constflightDestination={

packages/react-server-dom-esm/src/client/ReactFlightDOMClientBrowser.js

@@ -52,6 +52,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -103,6 +104,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-esm/src/client/ReactFlightDOMClientNode.js

@@ -57,6 +57,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -112,6 +113,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientBrowser.js

@@ -129,6 +129,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }
@@ -205,6 +208,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 exportfunctioncreateFromReadableStream<T>(

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -107,6 +108,9 @@ function createResponseFromOptions(options?: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientNode.js

@@ -52,6 +52,7 @@ export type Options = {
 encodeFormAction?: EncodeFormActionCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -103,6 +104,9 @@ export function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientBrowser.js

@@ -51,6 +51,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -102,6 +103,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -109,6 +110,9 @@ function createResponseFromOptions(options: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientNode.js

@@ -60,6 +60,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -114,6 +115,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-client/src/ReactFlightClient.js

@@ -2561,6 +2561,7 @@ function ResponseInstance(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ){
 constchunks: Map<number,SomeChunk<any>>=newMap();
@@ -2621,7 +2622,8 @@ function ResponseInstance(
 // Note: createFromFetch allows this to be marked at the start of the fetch
 // where as if you use createFromReadableStream from the body of the fetch
 // then the start time is when the headers resolved.
-this._debugStartTime=performance.now();
+this._debugStartTime=
+debugStartTime==null ? performance.now() : debugStartTime;
 this._debugIOStarted=false;
 // We consider everything before the first setTimeout task to be cached data
 // and is not considered I/O required to load the stream.
@@ -2669,6 +2671,7 @@ export function createResponse(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ): WeakResponse{
 returngetWeakResponse(
@@ -2684,6 +2687,7 @@ export function createResponse(
 findSourceMapURL,
 replayConsole,
 environmentName,
+debugStartTime,
 debugChannel,
 ),
 );

packages/react-markup/src/ReactMarkupServer.js

@@ -91,6 +91,9 @@ export function experimental_renderToHTML(
 undefined,
 undefined,
 false,
+undefined,
+undefined,
+undefined,
 );
 conststreamState=createFlightStreamState(flightResponse,null);
 constflightDestination={

packages/react-server-dom-esm/src/client/ReactFlightDOMClientBrowser.js

@@ -52,6 +52,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -103,6 +104,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-esm/src/client/ReactFlightDOMClientNode.js

@@ -57,6 +57,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -112,6 +113,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientBrowser.js

@@ -129,6 +129,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }
@@ -205,6 +208,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 exportfunctioncreateFromReadableStream<T>(

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -107,6 +108,9 @@ function createResponseFromOptions(options?: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientNode.js

@@ -52,6 +52,7 @@ export type Options = {
 encodeFormAction?: EncodeFormActionCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -103,6 +104,9 @@ export function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientBrowser.js

@@ -51,6 +51,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -102,6 +103,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -109,6 +110,9 @@ function createResponseFromOptions(options: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientNode.js

@@ -60,6 +60,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -114,6 +115,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-client/src/ReactFlightClient.js

@@ -2561,6 +2561,7 @@ function ResponseInstance(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ){
 constchunks: Map<number,SomeChunk<any>>=newMap();
@@ -2621,7 +2622,8 @@ function ResponseInstance(
 // Note: createFromFetch allows this to be marked at the start of the fetch
 // where as if you use createFromReadableStream from the body of the fetch
 // then the start time is when the headers resolved.
-this._debugStartTime=performance.now();
+this._debugStartTime=
+debugStartTime==null ? performance.now() : debugStartTime;
 this._debugIOStarted=false;
 // We consider everything before the first setTimeout task to be cached data
 // and is not considered I/O required to load the stream.
@@ -2669,6 +2671,7 @@ export function createResponse(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ): WeakResponse{
 returngetWeakResponse(
@@ -2684,6 +2687,7 @@ export function createResponse(
 findSourceMapURL,
 replayConsole,
 environmentName,
+debugStartTime,
 debugChannel,
 ),
 );

packages/react-markup/src/ReactMarkupServer.js

@@ -91,6 +91,9 @@ export function experimental_renderToHTML(
 undefined,
 undefined,
 false,
+undefined,
+undefined,
+undefined,
 );
 conststreamState=createFlightStreamState(flightResponse,null);
 constflightDestination={

packages/react-server-dom-esm/src/client/ReactFlightDOMClientBrowser.js

@@ -52,6 +52,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -103,6 +104,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-esm/src/client/ReactFlightDOMClientNode.js

@@ -57,6 +57,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -112,6 +113,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientBrowser.js

@@ -129,6 +129,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }
@@ -205,6 +208,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 exportfunctioncreateFromReadableStream<T>(

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -107,6 +108,9 @@ function createResponseFromOptions(options?: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientNode.js

@@ -52,6 +52,7 @@ export type Options = {
 encodeFormAction?: EncodeFormActionCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -103,6 +104,9 @@ export function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientBrowser.js

@@ -51,6 +51,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -102,6 +103,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -109,6 +110,9 @@ function createResponseFromOptions(options: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientNode.js

@@ -60,6 +60,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -114,6 +115,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-client/src/ReactFlightClient.js

@@ -2561,6 +2561,7 @@ function ResponseInstance(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ){
 constchunks: Map<number,SomeChunk<any>>=newMap();
@@ -2621,7 +2622,8 @@ function ResponseInstance(
 // Note: createFromFetch allows this to be marked at the start of the fetch
 // where as if you use createFromReadableStream from the body of the fetch
 // then the start time is when the headers resolved.
-this._debugStartTime=performance.now();
+this._debugStartTime=
+debugStartTime==null ? performance.now() : debugStartTime;
 this._debugIOStarted=false;
 // We consider everything before the first setTimeout task to be cached data
 // and is not considered I/O required to load the stream.
@@ -2669,6 +2671,7 @@ export function createResponse(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ): WeakResponse{
 returngetWeakResponse(
@@ -2684,6 +2687,7 @@ export function createResponse(
 findSourceMapURL,
 replayConsole,
 environmentName,
+debugStartTime,
 debugChannel,
 ),
 );

packages/react-markup/src/ReactMarkupServer.js

@@ -91,6 +91,9 @@ export function experimental_renderToHTML(
 undefined,
 undefined,
 false,
+undefined,
+undefined,
+undefined,
 );
 conststreamState=createFlightStreamState(flightResponse,null);
 constflightDestination={

packages/react-server-dom-esm/src/client/ReactFlightDOMClientBrowser.js

@@ -52,6 +52,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -103,6 +104,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-esm/src/client/ReactFlightDOMClientNode.js

@@ -57,6 +57,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -112,6 +113,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientBrowser.js

@@ -129,6 +129,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }
@@ -205,6 +208,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 exportfunctioncreateFromReadableStream<T>(

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -107,6 +108,9 @@ function createResponseFromOptions(options?: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientNode.js

@@ -52,6 +52,7 @@ export type Options = {
 encodeFormAction?: EncodeFormActionCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -103,6 +104,9 @@ export function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientBrowser.js

@@ -51,6 +51,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -102,6 +103,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -109,6 +110,9 @@ function createResponseFromOptions(options: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientNode.js

@@ -60,6 +60,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -114,6 +115,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-client/src/ReactFlightClient.js

@@ -2561,6 +2561,7 @@ function ResponseInstance(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ){
 constchunks: Map<number,SomeChunk<any>>=newMap();
@@ -2621,7 +2622,8 @@ function ResponseInstance(
 // Note: createFromFetch allows this to be marked at the start of the fetch
 // where as if you use createFromReadableStream from the body of the fetch
 // then the start time is when the headers resolved.
-this._debugStartTime=performance.now();
+this._debugStartTime=
+debugStartTime==null ? performance.now() : debugStartTime;
 this._debugIOStarted=false;
 // We consider everything before the first setTimeout task to be cached data
 // and is not considered I/O required to load the stream.
@@ -2669,6 +2671,7 @@ export function createResponse(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ): WeakResponse{
 returngetWeakResponse(
@@ -2684,6 +2687,7 @@ export function createResponse(
 findSourceMapURL,
 replayConsole,
 environmentName,
+debugStartTime,
 debugChannel,
 ),
 );

packages/react-markup/src/ReactMarkupServer.js

@@ -91,6 +91,9 @@ export function experimental_renderToHTML(
 undefined,
 undefined,
 false,
+undefined,
+undefined,
+undefined,
 );
 conststreamState=createFlightStreamState(flightResponse,null);
 constflightDestination={

packages/react-server-dom-esm/src/client/ReactFlightDOMClientBrowser.js

@@ -52,6 +52,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -103,6 +104,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-esm/src/client/ReactFlightDOMClientNode.js

@@ -57,6 +57,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -112,6 +113,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientBrowser.js

@@ -129,6 +129,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }
@@ -205,6 +208,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 exportfunctioncreateFromReadableStream<T>(

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -107,6 +108,9 @@ function createResponseFromOptions(options?: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientNode.js

@@ -52,6 +52,7 @@ export type Options = {
 encodeFormAction?: EncodeFormActionCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -103,6 +104,9 @@ export function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientBrowser.js

@@ -51,6 +51,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -102,6 +103,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -109,6 +110,9 @@ function createResponseFromOptions(options: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientNode.js

@@ -60,6 +60,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -114,6 +115,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-client/src/ReactFlightClient.js

@@ -2561,6 +2561,7 @@ function ResponseInstance(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ){
 constchunks: Map<number,SomeChunk<any>>=newMap();
@@ -2621,7 +2622,8 @@ function ResponseInstance(
 // Note: createFromFetch allows this to be marked at the start of the fetch
 // where as if you use createFromReadableStream from the body of the fetch
 // then the start time is when the headers resolved.
-this._debugStartTime=performance.now();
+this._debugStartTime=
+debugStartTime==null ? performance.now() : debugStartTime;
 this._debugIOStarted=false;
 // We consider everything before the first setTimeout task to be cached data
 // and is not considered I/O required to load the stream.
@@ -2669,6 +2671,7 @@ export function createResponse(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ): WeakResponse{
 returngetWeakResponse(
@@ -2684,6 +2687,7 @@ export function createResponse(
 findSourceMapURL,
 replayConsole,
 environmentName,
+debugStartTime,
 debugChannel,
 ),
 );

packages/react-markup/src/ReactMarkupServer.js

@@ -91,6 +91,9 @@ export function experimental_renderToHTML(
 undefined,
 undefined,
 false,
+undefined,
+undefined,
+undefined,
 );
 conststreamState=createFlightStreamState(flightResponse,null);
 constflightDestination={

packages/react-server-dom-esm/src/client/ReactFlightDOMClientBrowser.js

@@ -52,6 +52,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -103,6 +104,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-esm/src/client/ReactFlightDOMClientNode.js

@@ -57,6 +57,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -112,6 +113,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientBrowser.js

@@ -129,6 +129,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }
@@ -205,6 +208,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 exportfunctioncreateFromReadableStream<T>(

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -107,6 +108,9 @@ function createResponseFromOptions(options?: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientNode.js

@@ -52,6 +52,7 @@ export type Options = {
 encodeFormAction?: EncodeFormActionCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -103,6 +104,9 @@ export function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientBrowser.js

@@ -51,6 +51,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -102,6 +103,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -109,6 +110,9 @@ function createResponseFromOptions(options: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientNode.js

@@ -60,6 +60,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -114,6 +115,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-client/src/ReactFlightClient.js

@@ -2561,6 +2561,7 @@ function ResponseInstance(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ){
 constchunks: Map<number,SomeChunk<any>>=newMap();
@@ -2621,7 +2622,8 @@ function ResponseInstance(
 // Note: createFromFetch allows this to be marked at the start of the fetch
 // where as if you use createFromReadableStream from the body of the fetch
 // then the start time is when the headers resolved.
-this._debugStartTime=performance.now();
+this._debugStartTime=
+debugStartTime==null ? performance.now() : debugStartTime;
 this._debugIOStarted=false;
 // We consider everything before the first setTimeout task to be cached data
 // and is not considered I/O required to load the stream.
@@ -2669,6 +2671,7 @@ export function createResponse(
 findSourceMapURL: void|FindSourceMapURLCallback,// DEV-only
 replayConsole: boolean,// DEV-only
 environmentName: void|string,// DEV-only
+debugStartTime: void|number,// DEV-only
 debugChannel: void|DebugChannel,// DEV-only
 ): WeakResponse{
 returngetWeakResponse(
@@ -2684,6 +2687,7 @@ export function createResponse(
 findSourceMapURL,
 replayConsole,
 environmentName,
+debugStartTime,
 debugChannel,
 ),
 );

packages/react-markup/src/ReactMarkupServer.js

@@ -91,6 +91,9 @@ export function experimental_renderToHTML(
 undefined,
 undefined,
 false,
+undefined,
+undefined,
+undefined,
 );
 conststreamState=createFlightStreamState(flightResponse,null);
 constflightDestination={

packages/react-server-dom-esm/src/client/ReactFlightDOMClientBrowser.js

@@ -52,6 +52,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -103,6 +104,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-esm/src/client/ReactFlightDOMClientNode.js

@@ -57,6 +57,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -112,6 +113,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientBrowser.js

@@ -129,6 +129,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }
@@ -205,6 +208,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 exportfunctioncreateFromReadableStream<T>(

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 temporaryReferences?: TemporaryReferenceSet,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -107,6 +108,9 @@ function createResponseFromOptions(options?: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-parcel/src/client/ReactFlightDOMClientNode.js

@@ -52,6 +52,7 @@ export type Options = {
 encodeFormAction?: EncodeFormActionCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -103,6 +104,9 @@ export function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientBrowser.js

@@ -51,6 +51,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 };
 
 functioncreateDebugCallbackFromWritableStream(
@@ -102,6 +103,9 @@ function createResponseFromOptions(options: void | Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientEdge.js

@@ -79,6 +79,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Edge client we only support a single-direction debug channel.
 debugChannel?: {readable?: ReadableStream, ...},
 };
@@ -109,6 +110,9 @@ function createResponseFromOptions(options: Options) {
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );
 }

packages/react-server-dom-turbopack/src/client/ReactFlightDOMClientNode.js

@@ -60,6 +60,7 @@ export type Options = {
 findSourceMapURL?: FindSourceMapURLCallback,
 replayConsoleLogs?: boolean,
 environmentName?: string,
+startTime?: number,
 // For the Node.js client we only support a single-direction debug channel.
 debugChannel?: Readable,
 };
@@ -114,6 +115,9 @@ function createFromNodeStream<T>(
 __DEV__&&options&&options.environmentName
  ? options.environmentName
  : undefined,
+__DEV__&&options&&options.startTime!=null
+ ? options.startTime
+ : undefined,
 debugChannel,
 );