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Each page in this section ships with a ",[622,623,624],"code",{},"::prompt"," block you can drop into Cursor \u002F Claude to scaffold the integration in your own app.",[627,628,630],"h2",{"id":629},"mental-model","Mental model",[632,633,639],"pre",{"className":634,"code":636,"language":637,"meta":638},[635],"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","",[622,640,636],{"__ignoreMap":638},[627,642,644],{"id":643},"three-ways-to-extend","Three ways to extend",[646,647,649],"h3",{"id":648},"observe-the-pipeline-no-mutation","Observe the pipeline (no mutation)",[605,651,652,653,656,657,660],{},"Subscribe to events without changing what gets emitted. The stream is the live feed, the fs reader is the historic log, the diagnostics channel lets a consumer subscribe by channel name alone, and consumer recipes show you how to wire any of them to a devtool, dashboard, CLI tail, or ",[622,654,655],{},"curl"," + ",[622,658,659],{},"jq",".",[662,663,664,677],"table",{},[665,666,667],"thead",{},[668,669,670,674],"tr",{},[671,672,673],"th",{},"You want to…",[671,675,676],{},"Use",[678,679,680,691,700,714],"tbody",{},[668,681,682,686],{},[683,684,685],"td",{},"Subscribe to live events (in-process or over SSE for browsers \u002F CLIs)",[683,687,688],{},[689,690,485],"a",{"href":486},[668,692,693,696],{},[683,694,695],{},"Replay or tail historic events from disk",[683,697,698],{},[689,699,499],{"href":500},[668,701,702,709],{},[683,703,704,705,656,707],{},"Build a small consumer panel, devtool, or pipe to ",[622,706,655],{},[622,708,659],{},[683,710,711],{},[689,712,713],{"href":504},"Consumer recipes",[668,715,716,719],{},[683,717,718],{},"Let a consumer subscribe without importing evlog, or reach a Cloudflare Tail Worker",[683,720,721],{},[689,722,495],{"href":496},[646,724,726],{"id":725},"plug-into-the-pipeline","Plug into the pipeline",[605,728,729,730,733],{},"Hook into the pipeline at one or more of its lifecycle stages. The four pages below cover the entire extension surface. Pick one when you have a single concern, pick ",[622,731,732],{},"definePlugin"," when you have several.",[662,735,736,744],{},[665,737,738],{},[668,739,740,742],{},[671,741,673],{},[671,743,676],{},[678,745,746,755,764,773],{},[668,747,748,751],{},[683,749,750],{},"React to lifecycle events from a single cohesive object (multiple hooks share state)",[683,752,753],{},[689,754,508],{"href":509},[668,756,757,760],{},[683,758,759],{},"Add a derived field on every event automatically",[683,761,762],{},[689,763,512],{"href":513},[668,765,766,769],{},[683,767,768],{},"Decide post-hoc whether to keep an event (status, duration, custom logic)",[683,770,771],{},[689,772,516],{"href":517},[668,774,775,786],{},[683,776,777,778,781,782,785],{},"Identify your evlog traffic on the receiver side (override ",[622,779,780],{},"User-Agent"," \u002F ",[622,783,784],{},"X-Evlog-Source",")",[683,787,788],{},[689,789,520],{"href":521},[646,791,793],{"id":792},"build-your-own-bricks","Build your own bricks",[605,795,796],{},"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.",[662,798,799,807],{},[665,800,801],{},[668,802,803,805],{},[671,804,673],{},[671,806,676],{},[678,808,809,818,827],{},[668,810,811,814],{},[683,812,813],{},"Ship events to a backend without a built-in adapter (HTTP or any other transport)",[683,815,816],{},[689,817,525],{"href":526},[668,819,820,823],{},[683,821,822],{},"Wrap any drain in batch + retry + fanout for production",[683,824,825],{},[689,826,530],{"href":531},[668,828,829,832],{},[683,830,831],{},"Support a framework that's not in the list, or a non-HTTP runtime",[683,833,834],{},[689,835,836],{"href":491},"Custom framework integration",[605,838,839,840,843],{},"Shipping a library or SDK that emits events, rather than a drain or an integration? ",[689,841,454],{"href":842},"\u002Fuse-cases\u002Flibraries"," covers the contract library authors follow: emit without owning the configuration, attribute your events, throw catalog errors.",[627,845,847],{"id":846},"what-works-where","What works where",[605,849,850,851,854,855,858,859,862],{},"Only the ",[689,852,853],{"href":486},"stream"," (in-process bus + SSE bridge) is ",[609,856,857],{},"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 ",[689,860,861],{"href":486},"stream page"," explains the constraint in detail.",[605,864,865,866,868,869,868,872,868,875,868,878,868,881,868,884,868,887,890],{},"Everything else, from ",[689,867,499],{"href":500},", ",[689,870,871],{"href":509},"plugins",[689,873,874],{"href":513},"custom enrichers",[689,876,877],{"href":517},"tail sampling",[689,879,880],{"href":521},"identity headers",[689,882,883],{"href":526},"custom drains",[689,885,886],{"href":531},"drain pipeline",[689,888,889],{"href":491},"custom framework integration",", runs everywhere evlog runs.",{"title":638,"searchDepth":892,"depth":892,"links":893},2,[894,895,901],{"id":629,"depth":892,"text":630},{"id":643,"depth":892,"text":644,"children":896},[897,899,900],{"id":648,"depth":898,"text":649},3,{"id":725,"depth":898,"text":726},{"id":792,"depth":898,"text":793},{"id":846,"depth":892,"text":847},"Observe what flows through the pipeline, plug into it, or build your own bricks. The map of every extension point evlog exposes.","md",[905,908,909],{"label":485,"icon":466,"to":486,"color":906,"variant":907},"neutral","subtle",{"label":508,"icon":483,"to":509,"color":906,"variant":907},{"label":910,"icon":528,"to":526,"color":906,"variant":907},"Custom Drains",{},{"title":41,"icon":483},{"title":600,"description":902},"Rqd_FvsmK5LkOp-EjjvZCOmxQ2u-yXAKru31l9SofK4",[916,918],{"title":471,"path":472,"stem":473,"description":917,"icon":474,"children":-1},"Test the events your package emits and the errors it throws: a collecting drain, the memory drain, and factory codes that fail on rename.",{"title":485,"path":486,"stem":487,"description":919,"icon":488,"children":-1},"Subscribe to wide events flowing through evlog — in-process with createStreamDrain, or over the network with the local SSE stream server.",1789076905026]