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Each page in this section ships with a ",[553,554,555],"code",{},"::prompt"," block you can drop into Cursor \u002F Claude to scaffold the integration in your own app.",[558,559,561],"h2",{"id":560},"mental-model","Mental model",[563,564,570],"pre",{"className":565,"code":567,"language":568,"meta":569},[566],"language-text","your app code\n     │\n     │  emit\n     ▼\n┌──────────────────────────────────────────────────────────────────┐\n│   evlog pipeline                                                 │\n│                                                                  │\n│   request lifecycle  →  enrich  →  tail sample  →  drain         │\n│                                                                  │\n└──────────────────────────────────────────────────────────────────┘\n     │                                                  │\n     │  observe (no mutation)                           │  ship\n     ▼                                                  ▼\n┌─────────────────────────────────────────┐    ┌─────────────────────┐\n│   stream (in-process + SSE bridge)      │    │   custom drains     │\n│   fs reader (NDJSON history)            │    │   drain pipeline    │\n│   diagnostics channel (evlog.event)     │    │   (batch + fanout)  │\n│   consumer recipes (devtools, dashboards)│    │                     │\n└─────────────────────────────────────────┘    └─────────────────────┘\n","text","",[553,571,567],{"__ignoreMap":569},[558,573,575],{"id":574},"three-ways-to-extend","Three ways to extend",[577,578,580],"h3",{"id":579},"observe-the-pipeline-no-mutation","Observe the pipeline (no mutation)",[536,582,583,584,587,588,591],{},"Subscribe to events without changing what gets emitted. 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The four pages below cover the entire extension surface. Pick one when you have a single concern, pick ",[553,662,663],{},"definePlugin"," when you have several.",[593,666,667,675],{},[596,668,669],{},[599,670,671,673],{},[602,672,604],{},[602,674,607],{},[609,676,677,686,695,704],{},[599,678,679,682],{},[614,680,681],{},"React to lifecycle events from a single cohesive object (multiple hooks share state)",[614,683,684],{},[620,685,469],{"href":470},[599,687,688,691],{},[614,689,690],{},"Add a derived field on every event automatically",[614,692,693],{},[620,694,473],{"href":474},[599,696,697,700],{},[614,698,699],{},"Decide post-hoc whether to keep an event (status, duration, custom logic)",[614,701,702],{},[620,703,477],{"href":478},[599,705,706,717],{},[614,707,708,709,712,713,716],{},"Identify your evlog traffic on the receiver side (override ",[553,710,711],{},"User-Agent"," \u002F ",[553,714,715],{},"X-Evlog-Source",")",[614,718,719],{},[620,720,482],{"href":483},[577,722,724],{"id":723},"build-your-own-bricks","Build your own bricks",[536,726,727],{},"When the built-in adapters or framework integrations don't cover what you need, the toolkit lets you build your own with the same shape and ergonomics.",[593,729,730,738],{},[596,731,732],{},[599,733,734,736],{},[602,735,604],{},[602,737,607],{},[609,739,740,749,759],{},[599,741,742,745],{},[614,743,744],{},"Ship events to a backend without a built-in adapter (HTTP or any other transport)",[614,746,747],{},[620,748,487],{"href":488},[599,750,751,754],{},[614,752,753],{},"Wrap any drain in batch + retry + fanout for production",[614,755,756],{},[620,757,758],{"href":493},"Drain pipeline",[599,760,761,764],{},[614,762,763],{},"Support a framework that's not in the list, or a non-HTTP runtime",[614,765,766],{},[620,767,768],{"href":452},"Custom framework integration",[558,770,772],{"id":771},"what-works-where","What works where",[536,774,775,776,779,780,783,784,787],{},"Only the ",[620,777,778],{"href":447},"stream"," (in-process bus + SSE bridge) is ",[540,781,782],{},"local-only",": it lives inside one Node \u002F Bun \u002F Deno process and does not work on serverless platforms (Vercel Functions, Cloudflare Workers, AWS Lambda). The ",[620,785,786],{"href":447},"stream page"," explains the constraint in detail.",[536,789,790,791,793,794,793,797,793,800,793,803,793,806,793,809,793,812,815],{},"Everything else, from ",[620,792,460],{"href":461},", ",[620,795,796],{"href":470},"plugins",[620,798,799],{"href":474},"custom enrichers",[620,801,802],{"href":478},"tail sampling",[620,804,805],{"href":483},"identity headers",[620,807,808],{"href":488},"custom drains",[620,810,811],{"href":493},"drain pipeline",[620,813,814],{"href":452},"custom framework integration",", runs everywhere evlog runs.",{"title":569,"searchDepth":817,"depth":817,"links":818},2,[819,820,826],{"id":560,"depth":817,"text":561},{"id":574,"depth":817,"text":575,"children":821},[822,824,825],{"id":579,"depth":823,"text":580},3,{"id":656,"depth":823,"text":657},{"id":723,"depth":823,"text":724},{"id":771,"depth":817,"text":772},"Observe what flows through the pipeline, plug into it, or build your own bricks. The map of every extension point evlog exposes.","md",[830,834,835],{"label":446,"icon":831,"to":447,"color":832,"variant":833},"i-lucide-radio","neutral","subtle",{"label":469,"icon":444,"to":470,"color":832,"variant":833},{"label":836,"icon":490,"to":488,"color":832,"variant":833},"Custom Drains",{},{"title":128,"icon":444},{"title":531,"description":827},"V_xDrKj8z8Ae6zV4vG6-iM5Kremy5pcLHNHZIqRw0Ss",[842,844],{"title":433,"path":434,"stem":435,"description":843,"children":-1},"[object Object]",{"title":446,"path":447,"stem":448,"description":845,"icon":449,"children":-1},"Subscribe to wide events flowing through evlog — in-process with createStreamDrain, or over the network with the local SSE stream server.",1786799154516]