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{"version":3,"file":"app-ssr-stream.js","names":[],"sources":["../../src/server/app-ssr-stream.ts"],"sourcesContent":["import { createInlineScriptTag, safeJsonStringify } from \"./html.js\";\n\ntype RscEmbedTransform = {\n flush(): string;\n finalize(): Promise<string>;\n /** Resolves when all raw bytes from the embed stream have been read. */\n getRawBuffer(): Promise<ArrayBuffer>;\n};\n\ntype HtmlInsertion = string | (() => string);\n\n/**\n * Fix invalid preload \"as\" values in RSC Flight hint lines before they reach\n * the client. React Flight emits HL hints with as=\"stylesheet\" for CSS, but\n * the HTML spec requires as=\"style\" for <link rel=\"preload\">.\n */\nexport function fixFlightHints(text: string): string {\n return text.replace(/(\\d*:HL\\[.*?),\"stylesheet\"(\\]|,)/g, '$1,\"style\"$2');\n}\n\n/**\n * Create a helper that progressively embeds RSC chunks as inline <script> tags.\n * The browser entry turns the embedded text chunks back into Uint8Array data.\n */\nexport function createRscEmbedTransform(\n embedStream: ReadableStream<Uint8Array>,\n scriptNonce?: string,\n): RscEmbedTransform {\n const reader = embedStream.getReader();\n const decoder = new TextDecoder();\n let pendingChunks: string[] = [];\n const rawChunks: Uint8Array[] = [];\n let reading = false;\n\n async function pumpReader(): Promise<void> {\n if (reading) return;\n reading = true;\n try {\n while (true) {\n const result = await reader.read();\n if (result.done) break;\n // Accumulate raw bytes BEFORE fixFlightHints so the cache stores\n // unmodified RSC data. The embed script path below applies fixes.\n rawChunks.push(result.value);\n const text = decoder.decode(result.value, { stream: true });\n // The RSC entry already fixes HL hints at the source. Keep this second\n // pass as defense in depth for any embed stream that bypasses that\n // wrapper; the rewrite is idempotent, so double-application is safe.\n pendingChunks.push(fixFlightHints(text));\n }\n } catch (error) {\n if (process.env.NODE_ENV !== \"production\") {\n console.warn(\"[vinext] RSC embed stream read error:\", error);\n }\n throw error;\n } finally {\n reading = false;\n }\n }\n\n const pumpPromise = pumpReader();\n\n return {\n flush(): string {\n if (pendingChunks.length === 0) return \"\";\n\n const chunks = pendingChunks;\n pendingChunks = [];\n\n let scripts = \"\";\n for (const chunk of chunks) {\n scripts += createInlineScriptTag(\n \"self.__VINEXT_RSC_CHUNKS__=self.__VINEXT_RSC_CHUNKS__||[];self.__VINEXT_RSC_CHUNKS__.push(\" +\n safeJsonStringify(chunk) +\n \")\",\n scriptNonce,\n );\n }\n return scripts;\n },\n\n async finalize(): Promise<string> {\n await pumpPromise;\n let scripts = this.flush();\n scripts += createInlineScriptTag(\"self.__VINEXT_RSC_DONE__=true\", scriptNonce);\n return scripts;\n },\n\n async getRawBuffer(): Promise<ArrayBuffer> {\n await pumpPromise;\n let totalLength = 0;\n for (const chunk of rawChunks) {\n totalLength += chunk.byteLength;\n }\n const buffer = new Uint8Array(totalLength);\n let offset = 0;\n for (const chunk of rawChunks) {\n buffer.set(chunk, offset);\n offset += chunk.byteLength;\n }\n rawChunks.length = 0;\n return buffer.buffer;\n },\n };\n}\n\n/**\n * Fix invalid preload \"as\" values in server-rendered HTML.\n * React Fizz emits <link rel=\"preload\" as=\"stylesheet\"> for CSS, but the\n * HTML spec requires as=\"style\" for <link rel=\"preload\">.\n */\nexport function fixPreloadAs(html: string): string {\n return html.replace(/<link(?=[^>]*\\srel=\"preload\")[^>]*>/g, (tag) =>\n tag.replace(' as=\"stylesheet\"', ' as=\"style\"'),\n );\n}\n\n/**\n * Create the tick-buffered HTML transform that injects RSC scripts between\n * React Fizz flush cycles without corrupting split HTML chunks.\n */\nexport function createTickBufferedTransform(\n rscEmbed: RscEmbedTransform,\n injectHTML: HtmlInsertion = \"\",\n): TransformStream<Uint8Array, Uint8Array> {\n const decoder = new TextDecoder();\n const encoder = new TextEncoder();\n const insertsPerFlush = typeof injectHTML === \"function\";\n let injected = false;\n let buffered: string[] = [];\n let timeoutId: ReturnType<typeof setTimeout> | null = null;\n const readInsertion = (): string =>\n typeof injectHTML === \"function\" ? injectHTML() : injectHTML;\n const emitInsertion = (controller: TransformStreamDefaultController<Uint8Array>): void => {\n const insertion = readInsertion();\n if (insertion) {\n controller.enqueue(encoder.encode(insertion));\n }\n };\n\n const flushBuffered = (controller: TransformStreamDefaultController<Uint8Array>): void => {\n if (buffered.length === 0) return;\n\n if (injected && insertsPerFlush) {\n // Emit newly collected server-inserted HTML before the next Fizz HTML\n // batch so CSS-in-JS styles precede the elements they style.\n emitInsertion(controller);\n }\n\n for (const chunk of buffered) {\n if (!injected) {\n const headEnd = chunk.indexOf(\"</head>\");\n if (headEnd !== -1) {\n const before = chunk.slice(0, headEnd);\n const after = chunk.slice(headEnd);\n controller.enqueue(encoder.encode(before + readInsertion() + after));\n injected = true;\n continue;\n }\n }\n controller.enqueue(encoder.encode(chunk));\n }\n buffered = [];\n };\n\n return new TransformStream<Uint8Array, Uint8Array>({\n transform(chunk, controller) {\n buffered.push(fixPreloadAs(decoder.decode(chunk, { stream: true })));\n\n if (timeoutId !== null) return;\n\n timeoutId = setTimeout(() => {\n try {\n flushBuffered(controller);\n\n const rscScripts = rscEmbed.flush();\n if (rscScripts) {\n controller.enqueue(encoder.encode(rscScripts));\n }\n } catch {\n // Stream was cancelled between when the timeout was registered and\n // when it fired (e.g. client disconnected, health-check cancelled\n // the response body). Ignore — the stream is already closed.\n }\n\n timeoutId = null;\n }, 0);\n },\n\n async flush(controller) {\n if (timeoutId !== null) {\n clearTimeout(timeoutId);\n timeoutId = null;\n }\n\n flushBuffered(controller);\n\n if (!injected) {\n emitInsertion(controller);\n injected = true;\n } else if (insertsPerFlush) {\n emitInsertion(controller);\n }\n\n const finalScripts = await rscEmbed.finalize();\n if (finalScripts) {\n controller.enqueue(encoder.encode(finalScripts));\n }\n },\n });\n}\n"],"mappings":";;;;;;;AAgBA,SAAgB,eAAe,MAAsB;CACnD,OAAO,KAAK,QAAQ,qCAAqC,iBAAe;;;;;;AAO1E,SAAgB,wBACd,aACA,aACmB;CACnB,MAAM,SAAS,YAAY,WAAW;CACtC,MAAM,UAAU,IAAI,aAAa;CACjC,IAAI,gBAA0B,EAAE;CAChC,MAAM,YAA0B,EAAE;CAClC,IAAI,UAAU;CAEd,eAAe,aAA4B;EACzC,IAAI,SAAS;EACb,UAAU;EACV,IAAI;GACF,OAAO,MAAM;IACX,MAAM,SAAS,MAAM,OAAO,MAAM;IAClC,IAAI,OAAO,MAAM;IAGjB,UAAU,KAAK,OAAO,MAAM;IAC5B,MAAM,OAAO,QAAQ,OAAO,OAAO,OAAO,EAAE,QAAQ,MAAM,CAAC;IAI3D,cAAc,KAAK,eAAe,KAAK,CAAC;;WAEnC,OAAO;GACd,IAAI,QAAQ,IAAI,aAAa,cAC3B,QAAQ,KAAK,yCAAyC,MAAM;GAE9D,MAAM;YACE;GACR,UAAU;;;CAId,MAAM,cAAc,YAAY;CAEhC,OAAO;EACL,QAAgB;GACd,IAAI,cAAc,WAAW,GAAG,OAAO;GAEvC,MAAM,SAAS;GACf,gBAAgB,EAAE;GAElB,IAAI,UAAU;GACd,KAAK,MAAM,SAAS,QAClB,WAAW,sBACT,+FACE,kBAAkB,MAAM,GACxB,KACF,YACD;GAEH,OAAO;;EAGT,MAAM,WAA4B;GAChC,MAAM;GACN,IAAI,UAAU,KAAK,OAAO;GAC1B,WAAW,sBAAsB,iCAAiC,YAAY;GAC9E,OAAO;;EAGT,MAAM,eAAqC;GACzC,MAAM;GACN,IAAI,cAAc;GAClB,KAAK,MAAM,SAAS,WAClB,eAAe,MAAM;GAEvB,MAAM,SAAS,IAAI,WAAW,YAAY;GAC1C,IAAI,SAAS;GACb,KAAK,MAAM,SAAS,WAAW;IAC7B,OAAO,IAAI,OAAO,OAAO;IACzB,UAAU,MAAM;;GAElB,UAAU,SAAS;GACnB,OAAO,OAAO;;EAEjB;;;;;;;AAQH,SAAgB,aAAa,MAAsB;CACjD,OAAO,KAAK,QAAQ,yCAAyC,QAC3D,IAAI,QAAQ,sBAAoB,gBAAc,CAC/C;;;;;;AAOH,SAAgB,4BACd,UACA,aAA4B,IACa;CACzC,MAAM,UAAU,IAAI,aAAa;CACjC,MAAM,UAAU,IAAI,aAAa;CACjC,MAAM,kBAAkB,OAAO,eAAe;CAC9C,IAAI,WAAW;CACf,IAAI,WAAqB,EAAE;CAC3B,IAAI,YAAkD;CACtD,MAAM,sBACJ,OAAO,eAAe,aAAa,YAAY,GAAG;CACpD,MAAM,iBAAiB,eAAmE;EACxF,MAAM,YAAY,eAAe;EACjC,IAAI,WACF,WAAW,QAAQ,QAAQ,OAAO,UAAU,CAAC;;CAIjD,MAAM,iBAAiB,eAAmE;EACxF,IAAI,SAAS,WAAW,GAAG;EAE3B,IAAI,YAAY,iBAGd,cAAc,WAAW;EAG3B,KAAK,MAAM,SAAS,UAAU;GAC5B,IAAI,CAAC,UAAU;IACb,MAAM,UAAU,MAAM,QAAQ,UAAU;IACxC,IAAI,YAAY,IAAI;KAClB,MAAM,SAAS,MAAM,MAAM,GAAG,QAAQ;KACtC,MAAM,QAAQ,MAAM,MAAM,QAAQ;KAClC,WAAW,QAAQ,QAAQ,OAAO,SAAS,eAAe,GAAG,MAAM,CAAC;KACpE,WAAW;KACX;;;GAGJ,WAAW,QAAQ,QAAQ,OAAO,MAAM,CAAC;;EAE3C,WAAW,EAAE;;CAGf,OAAO,IAAI,gBAAwC;EACjD,UAAU,OAAO,YAAY;GAC3B,SAAS,KAAK,aAAa,QAAQ,OAAO,OAAO,EAAE,QAAQ,MAAM,CAAC,CAAC,CAAC;GAEpE,IAAI,cAAc,MAAM;GAExB,YAAY,iBAAiB;IAC3B,IAAI;KACF,cAAc,WAAW;KAEzB,MAAM,aAAa,SAAS,OAAO;KACnC,IAAI,YACF,WAAW,QAAQ,QAAQ,OAAO,WAAW,CAAC;YAE1C;IAMR,YAAY;MACX,EAAE;;EAGP,MAAM,MAAM,YAAY;GACtB,IAAI,cAAc,MAAM;IACtB,aAAa,UAAU;IACvB,YAAY;;GAGd,cAAc,WAAW;GAEzB,IAAI,CAAC,UAAU;IACb,cAAc,WAAW;IACzB,WAAW;UACN,IAAI,iBACT,cAAc,WAAW;GAG3B,MAAM,eAAe,MAAM,SAAS,UAAU;GAC9C,IAAI,cACF,WAAW,QAAQ,QAAQ,OAAO,aAAa,CAAC;;EAGrD,CAAC"}