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The ",[591,608,609],{},"evlog\u002Ffs"," module also ships ",[612,613,614],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[617,618],"ndjson-tail",{},[620,621,624,627,685],"prompt",{":actions":622,"description":623,"icon":480},"[\"copy\",\"cursor\",\"claude\"]","Read or tail evlog NDJSON logs from disk",[582,625,626],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[628,629,630,641,654,664,682],"ul",{},[631,632,633,634,636,637,640],"li",{},"Confirm the filesystem drain is wired up (",[591,635,609],{}," adapter writing NDJSON to ",[591,638,639],{},".evlog\u002Flogs\u002F*.jsonl",")",[631,642,643,644,647,648,650,651],{},"For replay: import ",[591,645,646],{},"readFsLogs"," from ",[591,649,609],{}," and iterate ",[591,652,653],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[631,655,656,657,660,661],{},"For follow mode: import ",[591,658,659],{},"tailFsLogs"," and iterate the same way. It watches for new lines, handles rotation, and accepts an ",[591,662,663],{},"AbortSignal",[631,665,666,667,670,671,670,674,677,678,681],{},"Apply filters at read time (",[591,668,669],{},"level",", ",[591,672,673],{},"since",[591,675,676],{},"until",", custom ",[591,679,680],{},"filter"," predicate) instead of post-processing",[631,683,684],{},"Treat malformed lines as silently skipped (partial writes happen), and never crash the script on a bad line",[582,686,687,688],{},"Docs: ",[586,689,690],{"href":690,"rel":691},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[692],"nofollow",[694,695,697],"h2",{"id":696},"replay-history","Replay history",[699,700,705],"pre",{"className":701,"code":702,"language":703,"meta":704,"style":704},"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","",[591,706,707,739,746,815,860],{"__ignoreMap":704},[708,709,712,716,720,724,727,730,733,736],"span",{"class":710,"line":711},"line",1,[708,713,715],{"class":714},"s7zQu","import",[708,717,719],{"class":718},"sMK4o"," {",[708,721,723],{"class":722},"sTEyZ"," readFsLogs",[708,725,726],{"class":718}," }",[708,728,729],{"class":714}," from",[708,731,732],{"class":718}," '",[708,734,609],{"class":735},"sfazB",[708,737,738],{"class":718},"'\n",[708,740,742],{"class":710,"line":741},2,[708,743,745],{"emptyLinePlaceholder":744},true,"\n",[708,747,749,752,755,758,762,765,768,771,774,777,781,784,786,789,792,795,798,800,802,805,807,809,812],{"class":710,"line":748},3,[708,750,751],{"class":714},"for",[708,753,754],{"class":714}," await",[708,756,757],{"class":722}," (",[708,759,761],{"class":760},"spNyl","const",[708,763,764],{"class":722}," event ",[708,766,767],{"class":718},"of",[708,769,723],{"class":770},"s2Zo4",[708,772,773],{"class":722},"(",[708,775,776],{"class":718},"{",[708,778,780],{"class":779},"swJcz"," since",[708,782,783],{"class":718},":",[708,785,732],{"class":718},[708,787,788],{"class":735},"2026-03-01",[708,790,791],{"class":718},"'",[708,793,794],{"class":718},",",[708,796,797],{"class":779}," level",[708,799,783],{"class":718},[708,801,732],{"class":718},[708,803,804],{"class":735},"error",[708,806,791],{"class":718},[708,808,726],{"class":718},[708,810,811],{"class":722},")) ",[708,813,814],{"class":718},"{\n",[708,816,818,821,824,827,829,832,834,837,839,842,844,847,850,852,854,857],{"class":710,"line":817},4,[708,819,820],{"class":722},"  console",[708,822,823],{"class":718},".",[708,825,826],{"class":770},"log",[708,828,773],{"class":779},[708,830,831],{"class":722},"event",[708,833,823],{"class":718},[708,835,836],{"class":722},"timestamp",[708,838,794],{"class":718},[708,840,841],{"class":722}," event",[708,843,823],{"class":718},[708,845,846],{"class":722},"action",[708,848,849],{"class":718}," ??",[708,851,841],{"class":722},[708,853,823],{"class":718},[708,855,856],{"class":722},"message",[708,858,859],{"class":779},")\n",[708,861,863],{"class":710,"line":862},5,[708,864,865],{"class":718},"}\n",[582,867,868,871],{},[591,869,870],{},"readFsLogs(options)"," walks the NDJSON files in chronological order, parses them line by line, and yields events that pass all filters. Files outside the date window are skipped entirely.",[873,874,346],"h3",{"id":875},"options",[877,878,879,895],"table",{},[880,881,882],"thead",{},[883,884,885,889,892],"tr",{},[886,887,888],"th",{},"Option",[886,890,891],{},"Type",[886,893,894],{},"Description",[896,897,898,917,934,949,963],"tbody",{},[883,899,900,906,911],{},[901,902,903],"td",{},[591,904,905],{},"dir",[901,907,908],{},[591,909,910],{},"string",[901,912,913,914,823],{},"Directory to read from. Default: ",[591,915,916],{},".evlog\u002Flogs",[883,918,919,923,928],{},[901,920,921],{},[591,922,673],{},[901,924,925],{},[591,926,927],{},"Date | string",[901,929,930,931,823],{},"Yield events with ",[591,932,933],{},"timestamp >= since",[883,935,936,940,944],{},[901,937,938],{},[591,939,676],{},[901,941,942],{},[591,943,927],{},[901,945,930,946,823],{},[591,947,948],{},"timestamp \u003C= until",[883,950,951,955,960],{},[901,952,953],{},[591,954,669],{},[901,956,957],{},[591,958,959],{},"LogLevel | LogLevel[]",[901,961,962],{},"Filter by event level.",[883,964,965,969,974],{},[901,966,967],{},[591,968,680],{},[901,970,971],{},[591,972,973],{},"(event) => boolean",[901,975,976],{},"Custom predicate.",[582,978,979],{},"Malformed lines (partial writes, manual edits) are silently skipped, so your script never crashes on a bad line.",[694,981,983],{"id":982},"live-tail","Live tail",[699,985,987],{"className":701,"code":986,"language":703,"meta":704,"style":704},"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",[591,988,989,1008,1012,1031,1069,1073,1113,1149],{"__ignoreMap":704},[708,990,991,993,995,998,1000,1002,1004,1006],{"class":710,"line":711},[708,992,715],{"class":714},[708,994,719],{"class":718},[708,996,997],{"class":722}," tailFsLogs",[708,999,726],{"class":718},[708,1001,729],{"class":714},[708,1003,732],{"class":718},[708,1005,609],{"class":735},[708,1007,738],{"class":718},[708,1009,1010],{"class":710,"line":741},[708,1011,745],{"emptyLinePlaceholder":744},[708,1013,1014,1016,1019,1022,1025,1028],{"class":710,"line":748},[708,1015,761],{"class":760},[708,1017,1018],{"class":722}," ac ",[708,1020,1021],{"class":718},"=",[708,1023,1024],{"class":718}," new",[708,1026,1027],{"class":770}," AbortController",[708,1029,1030],{"class":722},"()\n",[708,1032,1033,1036,1038,1041,1043,1045,1048,1050,1052,1055,1058,1061,1063,1066],{"class":710,"line":817},[708,1034,1035],{"class":722},"process",[708,1037,823],{"class":718},[708,1039,1040],{"class":770},"on",[708,1042,773],{"class":722},[708,1044,791],{"class":718},[708,1046,1047],{"class":735},"SIGINT",[708,1049,791],{"class":718},[708,1051,794],{"class":718},[708,1053,1054],{"class":718}," ()",[708,1056,1057],{"class":760}," =>",[708,1059,1060],{"class":722}," ac",[708,1062,823],{"class":718},[708,1064,1065],{"class":770},"abort",[708,1067,1068],{"class":722},"())\n",[708,1070,1071],{"class":710,"line":862},[708,1072,745],{"emptyLinePlaceholder":744},[708,1074,1076,1078,1080,1082,1084,1086,1088,1090,1092,1094,1097,1099,1101,1103,1106,1109,1111],{"class":710,"line":1075},6,[708,1077,751],{"class":714},[708,1079,754],{"class":714},[708,1081,757],{"class":722},[708,1083,761],{"class":760},[708,1085,764],{"class":722},[708,1087,767],{"class":718},[708,1089,997],{"class":770},[708,1091,773],{"class":722},[708,1093,776],{"class":718},[708,1095,1096],{"class":779}," signal",[708,1098,783],{"class":718},[708,1100,1060],{"class":722},[708,1102,823],{"class":718},[708,1104,1105],{"class":722},"signal ",[708,1107,1108],{"class":718},"}",[708,1110,811],{"class":722},[708,1112,814],{"class":718},[708,1114,1116,1118,1120,1122,1124,1126,1129,1131,1133,1135,1137,1139,1141,1143,1145,1147],{"class":710,"line":1115},7,[708,1117,820],{"class":722},[708,1119,823],{"class":718},[708,1121,826],{"class":770},[708,1123,773],{"class":779},[708,1125,791],{"class":718},[708,1127,1128],{"class":735},"live:",[708,1130,791],{"class":718},[708,1132,794],{"class":718},[708,1134,841],{"class":722},[708,1136,823],{"class":718},[708,1138,846],{"class":722},[708,1140,849],{"class":718},[708,1142,841],{"class":722},[708,1144,823],{"class":718},[708,1146,856],{"class":722},[708,1148,859],{"class":779},[708,1150,1152],{"class":710,"line":1151},8,[708,1153,865],{"class":718},[582,1155,1156,1159,1160,1163],{},[591,1157,1158],{},"tailFsLogs(options)"," first yields existing events (unless ",[591,1161,1162],{},"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.",[873,1165,1167],{"id":1166},"tail-specific-options","Tail-specific options",[877,1169,1170,1180],{},[880,1171,1172],{},[883,1173,1174,1176,1178],{},[886,1175,888],{},[886,1177,891],{},[886,1179,894],{},[896,1181,1182,1197,1212],{},[883,1183,1184,1189,1194],{},[901,1185,1186],{},[591,1187,1188],{},"pollIntervalMs",[901,1190,1191],{},[591,1192,1193],{},"number",[901,1195,1196],{},"Polling interval. Default: 500ms (minimum 50ms).",[883,1198,1199,1204,1209],{},[901,1200,1201],{},[591,1202,1203],{},"fromEnd",[901,1205,1206],{},[591,1207,1208],{},"boolean",[901,1210,1211],{},"Skip existing events; only yield future ones. Default: false.",[883,1213,1214,1219,1223],{},[901,1215,1216],{},[591,1217,1218],{},"signal",[901,1220,1221],{},[591,1222,663],{},[901,1224,1225],{},"Stop tailing when aborted.",[582,1227,1228,1229,1234],{},"All ",[586,1230,1232],{"href":1231},"#options",[591,1233,646],{}," options also apply.",[694,1236,1238],{"id":1237},"use-cases","Use cases",[628,1240,1241,1247,1250,1260],{},[631,1242,1243,1244,1246],{},"A local Electron \u002F Tauri dashboard reading ",[591,1245,597],{}," from a target project directory",[631,1248,1249],{},"A CI report aggregator that scans logs after a test run",[631,1251,1252,1253,1256,1257],{},"A ",[591,1254,1255],{},"grep","-style CLI that pipes filtered events into ",[591,1258,1259],{},"jq",[631,1261,1262,1263],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[586,1264,1266],{"href":1265},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1268,1269,1270],"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":704,"searchDepth":741,"depth":741,"links":1272},[1273,1276,1279],{"id":696,"depth":741,"text":697,"children":1274},[1275],{"id":875,"depth":748,"text":346},{"id":982,"depth":741,"text":983,"children":1277},[1278],{"id":1166,"depth":748,"text":1167},{"id":1237,"depth":741,"text":1238},"Replay and tail the local NDJSON drain with readFsLogs and tailFsLogs — works in-process or from any external Node tool, survives restarts.","md",null,{},{"title":477,"icon":480},{"title":477,"description":1280},"R4g1MMNweLy_HA56RMBi-WG1D7Jb4XHOLc2nDmDbp2A",[1288,1290],{"title":473,"path":474,"stem":475,"description":1289,"icon":466,"children":-1},"Publish every wide event on a node:diagnostics_channel, so a consumer subscribes without importing evlog and Cloudflare can Tail Worker it.",{"title":415,"path":482,"stem":483,"description":1291,"icon":484,"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.",1789915924291]