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The ",[470,475,476],{},"evlog\u002Ffs"," module also ships ",[479,480,481],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[484,485,488,491,549],"prompt",{":actions":486,"description":487,"icon":325},"[\"copy\",\"cursor\",\"windsurf\"]","Read or tail evlog NDJSON logs from disk",[461,489,490],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[492,493,494,505,518,528,546],"ul",{},[495,496,497,498,500,501,504],"li",{},"Confirm the filesystem drain is wired up (",[470,499,476],{}," adapter writing to ",[470,502,503],{},".evlog\u002Flogs\u002F*.ndjson",")",[495,506,507,508,511,512,514,515],{},"For replay: import ",[470,509,510],{},"readFsLogs"," from ",[470,513,476],{}," and iterate ",[470,516,517],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[495,519,520,521,524,525],{},"For follow mode: import ",[470,522,523],{},"tailFsLogs"," and iterate the same way — it watches for new lines, handles rotation, and accepts an ",[470,526,527],{},"AbortSignal",[495,529,530,531,534,535,534,538,541,542,545],{},"Apply filters at read time (",[470,532,533],{},"level",", ",[470,536,537],{},"since",[470,539,540],{},"until",", custom ",[470,543,544],{},"filter"," predicate) instead of post-processing",[495,547,548],{},"Treat malformed lines as silently skipped (partial writes happen) — never crash the script on a bad line",[461,550,551,552],{},"Docs: ",[465,553,554],{"href":554,"rel":555},"https:\u002F\u002Fwww.evlog.dev\u002Fbuild-on-top\u002Ffs-reader",[556],"nofollow",[558,559,561],"h2",{"id":560},"replay-history","Replay history",[563,564,569],"pre",{"className":565,"code":566,"language":567,"meta":568,"style":568},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { readFsLogs } from 'evlog\u002Ffs'\n\nfor await (const event of readFsLogs({ since: '2026-03-01', level: 'error' })) {\n  console.log(event.timestamp, event.action ?? event.message)\n}\n","ts","",[470,570,571,603,610,679,724],{"__ignoreMap":568},[572,573,576,580,584,588,591,594,597,600],"span",{"class":574,"line":575},"line",1,[572,577,579],{"class":578},"s7zQu","import",[572,581,583],{"class":582},"sMK4o"," {",[572,585,587],{"class":586},"sTEyZ"," readFsLogs",[572,589,590],{"class":582}," }",[572,592,593],{"class":578}," from",[572,595,596],{"class":582}," '",[572,598,476],{"class":599},"sfazB",[572,601,602],{"class":582},"'\n",[572,604,606],{"class":574,"line":605},2,[572,607,609],{"emptyLinePlaceholder":608},true,"\n",[572,611,613,616,619,622,626,629,632,635,638,641,645,648,650,653,656,659,662,664,666,669,671,673,676],{"class":574,"line":612},3,[572,614,615],{"class":578},"for",[572,617,618],{"class":578}," await",[572,620,621],{"class":586}," (",[572,623,625],{"class":624},"spNyl","const",[572,627,628],{"class":586}," event ",[572,630,631],{"class":582},"of",[572,633,587],{"class":634},"s2Zo4",[572,636,637],{"class":586},"(",[572,639,640],{"class":582},"{",[572,642,644],{"class":643},"swJcz"," since",[572,646,647],{"class":582},":",[572,649,596],{"class":582},[572,651,652],{"class":599},"2026-03-01",[572,654,655],{"class":582},"'",[572,657,658],{"class":582},",",[572,660,661],{"class":643}," level",[572,663,647],{"class":582},[572,665,596],{"class":582},[572,667,668],{"class":599},"error",[572,670,655],{"class":582},[572,672,590],{"class":582},[572,674,675],{"class":586},")) ",[572,677,678],{"class":582},"{\n",[572,680,682,685,688,691,693,696,698,701,703,706,708,711,714,716,718,721],{"class":574,"line":681},4,[572,683,684],{"class":586},"  console",[572,686,687],{"class":582},".",[572,689,690],{"class":634},"log",[572,692,637],{"class":643},[572,694,695],{"class":586},"event",[572,697,687],{"class":582},[572,699,700],{"class":586},"timestamp",[572,702,658],{"class":582},[572,704,705],{"class":586}," event",[572,707,687],{"class":582},[572,709,710],{"class":586},"action",[572,712,713],{"class":582}," ??",[572,715,705],{"class":586},[572,717,687],{"class":582},[572,719,720],{"class":586},"message",[572,722,723],{"class":643},")\n",[572,725,727],{"class":574,"line":726},5,[572,728,729],{"class":582},"}\n",[461,731,732,735],{},[470,733,734],{},"readFsLogs(options)"," walks the NDJSON files in chronological order, parses them line by line, and yields events that pass all filters. 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Default: ",[470,779,780],{},".evlog\u002Flogs",[747,782,783,787,792],{},[765,784,785],{},[470,786,537],{},[765,788,789],{},[470,790,791],{},"Date | string",[765,793,794,795,687],{},"Yield events with ",[470,796,797],{},"timestamp >= since",[747,799,800,804,808],{},[765,801,802],{},[470,803,540],{},[765,805,806],{},[470,807,791],{},[765,809,794,810,687],{},[470,811,812],{},"timestamp \u003C= until",[747,814,815,819,824],{},[765,816,817],{},[470,818,533],{},[765,820,821],{},[470,822,823],{},"LogLevel | LogLevel[]",[765,825,826],{},"Filter by event level.",[747,828,829,833,838],{},[765,830,831],{},[470,832,544],{},[765,834,835],{},[470,836,837],{},"(event) => boolean",[765,839,840],{},"Custom predicate.",[461,842,843],{},"Malformed lines (partial writes, manual edits) are silently skipped — your script never crashes on a bad line.",[558,845,847],{"id":846},"live-tail","Live tail",[563,849,851],{"className":565,"code":850,"language":567,"meta":568,"style":568},"import { tailFsLogs } from 'evlog\u002Ffs'\n\nconst ac = new AbortController()\nprocess.on('SIGINT', () => ac.abort())\n\nfor await (const event of tailFsLogs({ signal: ac.signal })) {\n  console.log('live:', event.action ?? event.message)\n}\n",[470,852,853,872,876,895,933,937,977,1013],{"__ignoreMap":568},[572,854,855,857,859,862,864,866,868,870],{"class":574,"line":575},[572,856,579],{"class":578},[572,858,583],{"class":582},[572,860,861],{"class":586}," tailFsLogs",[572,863,590],{"class":582},[572,865,593],{"class":578},[572,867,596],{"class":582},[572,869,476],{"class":599},[572,871,602],{"class":582},[572,873,874],{"class":574,"line":605},[572,875,609],{"emptyLinePlaceholder":608},[572,877,878,880,883,886,889,892],{"class":574,"line":612},[572,879,625],{"class":624},[572,881,882],{"class":586}," ac ",[572,884,885],{"class":582},"=",[572,887,888],{"class":582}," new",[572,890,891],{"class":634}," AbortController",[572,893,894],{"class":586},"()\n",[572,896,897,900,902,905,907,909,912,914,916,919,922,925,927,930],{"class":574,"line":681},[572,898,899],{"class":586},"process",[572,901,687],{"class":582},[572,903,904],{"class":634},"on",[572,906,637],{"class":586},[572,908,655],{"class":582},[572,910,911],{"class":599},"SIGINT",[572,913,655],{"class":582},[572,915,658],{"class":582},[572,917,918],{"class":582}," ()",[572,920,921],{"class":624}," =>",[572,923,924],{"class":586}," ac",[572,926,687],{"class":582},[572,928,929],{"class":634},"abort",[572,931,932],{"class":586},"())\n",[572,934,935],{"class":574,"line":726},[572,936,609],{"emptyLinePlaceholder":608},[572,938,940,942,944,946,948,950,952,954,956,958,961,963,965,967,970,973,975],{"class":574,"line":939},6,[572,941,615],{"class":578},[572,943,618],{"class":578},[572,945,621],{"class":586},[572,947,625],{"class":624},[572,949,628],{"class":586},[572,951,631],{"class":582},[572,953,861],{"class":634},[572,955,637],{"class":586},[572,957,640],{"class":582},[572,959,960],{"class":643}," signal",[572,962,647],{"class":582},[572,964,924],{"class":586},[572,966,687],{"class":582},[572,968,969],{"class":586},"signal ",[572,971,972],{"class":582},"}",[572,974,675],{"class":586},[572,976,678],{"class":582},[572,978,980,982,984,986,988,990,993,995,997,999,1001,1003,1005,1007,1009,1011],{"class":574,"line":979},7,[572,981,684],{"class":586},[572,983,687],{"class":582},[572,985,690],{"class":634},[572,987,637],{"class":643},[572,989,655],{"class":582},[572,991,992],{"class":599},"live:",[572,994,655],{"class":582},[572,996,658],{"class":582},[572,998,705],{"class":586},[572,1000,687],{"class":582},[572,1002,710],{"class":586},[572,1004,713],{"class":582},[572,1006,705],{"class":586},[572,1008,687],{"class":582},[572,1010,720],{"class":586},[572,1012,723],{"class":643},[572,1014,1016],{"class":574,"line":1015},8,[572,1017,729],{"class":582},[461,1019,1020,1023,1024,1027],{},[470,1021,1022],{},"tailFsLogs(options)"," first yields existing events (unless ",[470,1025,1026],{},"fromEnd: true","), then keeps yielding new ones as they're appended — including events written into newly created daily files. Partial writes split across polls are recombined transparently.",[737,1029,1031],{"id":1030},"tail-specific-options","Tail-specific options",[741,1033,1034,1044],{},[744,1035,1036],{},[747,1037,1038,1040,1042],{},[750,1039,752],{},[750,1041,755],{},[750,1043,758],{},[760,1045,1046,1061,1076],{},[747,1047,1048,1053,1058],{},[765,1049,1050],{},[470,1051,1052],{},"pollIntervalMs",[765,1054,1055],{},[470,1056,1057],{},"number",[765,1059,1060],{},"Polling interval. Default: 500ms (minimum 50ms).",[747,1062,1063,1068,1073],{},[765,1064,1065],{},[470,1066,1067],{},"fromEnd",[765,1069,1070],{},[470,1071,1072],{},"boolean",[765,1074,1075],{},"Skip existing events; only yield future ones. Default: false.",[747,1077,1078,1083,1087],{},[765,1079,1080],{},[470,1081,1082],{},"signal",[765,1084,1085],{},[470,1086,527],{},[765,1088,1089],{},"Stop tailing when aborted.",[461,1091,1092,1093,1098],{},"All ",[465,1094,1096],{"href":1095},"#options",[470,1097,510],{}," options also apply.",[558,1100,1102],{"id":1101},"use-cases","Use cases",[492,1104,1105,1111,1114,1124],{},[495,1106,1107,1108,1110],{},"A local Electron \u002F Tauri dashboard reading ",[470,1109,472],{}," from a target project directory.",[495,1112,1113],{},"A CI report aggregator that scans logs after a test run.",[495,1115,1116,1117,1120,1121,687],{},"A ",[470,1118,1119],{},"grep","-style CLI that pipes filtered events into ",[470,1122,1123],{},"jq",[495,1125,1126,1127,687],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[465,1128,1130],{"href":1129},"\u002Fbuild-on-top\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1132,1133,1134],"style",{},"html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}",{"title":568,"searchDepth":605,"depth":605,"links":1136},[1137,1140,1143],{"id":560,"depth":605,"text":561,"children":1138},[1139],{"id":739,"depth":612,"text":85},{"id":846,"depth":605,"text":847,"children":1141},[1142],{"id":1030,"depth":612,"text":1031},{"id":1101,"depth":605,"text":1102},"Replay and tail the local NDJSON drain with readFsLogs and tailFsLogs — works in-process or from any external Node tool.","md",null,{},{"title":322,"icon":325},{"title":456,"description":1144},"KsviPstPI1rl-nUA0USf9GvTShBENSxQHP99Iejo5N4",[1152,1154],{"title":317,"path":318,"stem":319,"description":1153,"icon":320,"children":-1},"A local HTTP mini-server on its own port that exposes the in-process stream over Server-Sent Events. Strict opt-in, framework-agnostic, no app route to wire.",{"title":156,"path":327,"stem":328,"description":1155,"icon":329,"children":-1},"Concrete copy-paste recipes — build your own minimal devtool, pipe to curl + jq, replay history then go live, and aggregate on the consumer side.",1778340943049]