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TypeScript",{"type":611,"value":612,"toc":2551},"minimark",[613,626,640,683,687,692,763,767,1217,1224,1246,1250,1253,1261,1365,1373,1506,1513,1516,1519,1843,1901,1905,1912,2252,2255,2265,2269,2274,2491,2496,2506,2510,2547],[614,615,616,617,621,622,625],"p",{},"For scripts, CLI tools, queue workers, cron jobs, and any TypeScript process that doesn't use a web framework, evlog provides ",[618,619,620],"code",{},"createLogger"," and ",[618,623,624],{},"createRequestLogger"," from the core package.",[627,628,631,632,635,636,639],"callout",{"color":629,"icon":630},"neutral","i-lucide-globe","For scripts, queue workers, cron, and CLIs, this page is the reference. On Cloudflare Workers, prefer ",[633,634,300],"a",{"href":301}," (",[618,637,638],{},"createWorkersLogger",").",[641,642,645,648,670],"prompt",{":actions":643,"description":644,"icon":79},"[\"copy\",\"cursor\",\"claude\"]","Set up evlog in my TypeScript project",[614,646,647],{},"Set up evlog in my TypeScript project for scripts, workers, or CLI tools.",[649,650,651,655,658,661,664,667],"ul",{},[652,653,654],"li",{},"Install evlog: pnpm add evlog",[652,656,657],{},"Import initLogger and createLogger (or createRequestLogger) from 'evlog'",[652,659,660],{},"Call initLogger({ env: { service: 'my-script' } }) once at startup",[652,662,663],{},"Create a logger per logical operation with createLogger({ jobId, source })",[652,665,666],{},"Use log.set() to accumulate context as the operation progresses",[652,668,669],{},"Call log.emit() manually when the operation completes",[614,671,672,673,678,679],{},"Docs: ",[633,674,675],{"href":675,"rel":676},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fframeworks\u002Fstandalone",[677],"nofollow","\nAdapters: ",[633,680,681],{"href":681,"rel":682},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fadapters\u002Foverview",[677],[684,685,25],"h2",{"id":686},"quick-start",[688,689,691],"h3",{"id":690},"_1-install","1. Install",[693,694,695,720,734,748],"code-group",{},[696,697,703],"pre",{"className":698,"code":699,"filename":700,"language":701,"meta":702,"style":702},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add evlog\n","pnpm","bash","",[618,704,705],{"__ignoreMap":702},[706,707,710,713,717],"span",{"class":708,"line":709},"line",1,[706,711,700],{"class":712},"sBMFI",[706,714,716],{"class":715},"sfazB"," add",[706,718,719],{"class":715}," evlog\n",[696,721,724],{"className":698,"code":722,"filename":723,"language":701,"meta":702,"style":702},"bun add evlog\n","bun",[618,725,726],{"__ignoreMap":702},[706,727,728,730,732],{"class":708,"line":709},[706,729,723],{"class":712},[706,731,716],{"class":715},[706,733,719],{"class":715},[696,735,738],{"className":698,"code":736,"filename":737,"language":701,"meta":702,"style":702},"yarn add evlog\n","yarn",[618,739,740],{"__ignoreMap":702},[706,741,742,744,746],{"class":708,"line":709},[706,743,737],{"class":712},[706,745,716],{"class":715},[706,747,719],{"class":715},[696,749,752],{"className":698,"code":750,"filename":751,"language":701,"meta":702,"style":702},"npm install evlog\n","npm",[618,753,754],{"__ignoreMap":702},[706,755,756,758,761],{"class":708,"line":709},[706,757,751],{"class":712},[706,759,760],{"class":715}," install",[706,762,719],{"class":715},[688,764,766],{"id":765},"_2-initialize-and-create-loggers","2. Initialize and create loggers",[696,768,773],{"className":769,"code":770,"filename":771,"language":772,"meta":702,"style":702},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import type { DrainContext } from 'evlog'\nimport { initLogger, log, createLogger } from 'evlog'\nimport { createAxiomDrain } from 'evlog\u002Faxiom'\nimport { createDrainPipeline } from 'evlog\u002Fpipeline'\n\nconst pipeline = createDrainPipeline\u003CDrainContext>({ batch: { size: 10 } })\nconst drain = pipeline(createAxiomDrain())\n\ninitLogger({\n  env: { service: 'my-script', environment: 'production' },\n  drain,\n})\n\n\u002F\u002F Every log is automatically drained\nlog.info({ action: 'sync_started' })\n\nconst syncLog = createLogger({ jobId: 'sync-001', source: 'postgres', target: 's3' })\nsyncLog.set({ recordsSynced: 150 })\nsyncLog.emit() \u002F\u002F drained automatically\n\n\u002F\u002F Flush remaining events before exit\nawait drain.flush()\n","scripts\u002Fsync-job.ts","typescript",[618,774,775,807,838,859,880,887,943,964,969,980,1020,1029,1037,1042,1049,1081,1086,1146,1173,1189,1194,1200],{"__ignoreMap":702},[706,776,777,781,784,788,792,795,798,801,804],{"class":708,"line":709},[706,778,780],{"class":779},"s7zQu","import",[706,782,783],{"class":779}," type",[706,785,787],{"class":786},"sMK4o"," {",[706,789,791],{"class":790},"sTEyZ"," DrainContext",[706,793,794],{"class":786}," }",[706,796,797],{"class":779}," from",[706,799,800],{"class":786}," '",[706,802,803],{"class":715},"evlog",[706,805,806],{"class":786},"'\n",[706,808,810,812,814,817,820,823,825,828,830,832,834,836],{"class":708,"line":809},2,[706,811,780],{"class":779},[706,813,787],{"class":786},[706,815,816],{"class":790}," initLogger",[706,818,819],{"class":786},",",[706,821,822],{"class":790}," log",[706,824,819],{"class":786},[706,826,827],{"class":790}," 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})\nlog.emit()\n","scripts\u002Fwebhook-handler.ts",[618,1378,1379,1398,1402,1416,1432,1448,1454,1496],{"__ignoreMap":702},[706,1380,1381,1383,1385,1388,1390,1392,1394,1396],{"class":708,"line":709},[706,1382,780],{"class":779},[706,1384,787],{"class":786},[706,1386,1387],{"class":790}," createRequestLogger",[706,1389,794],{"class":786},[706,1391,797],{"class":779},[706,1393,800],{"class":786},[706,1395,803],{"class":715},[706,1397,806],{"class":786},[706,1399,1400],{"class":708,"line":809},[706,1401,886],{"emptyLinePlaceholder":885},[706,1403,1404,1406,1408,1410,1412,1414],{"class":708,"line":840},[706,1405,893],{"class":892},[706,1407,1295],{"class":790},[706,1409,899],{"class":786},[706,1411,1387],{"class":902},[706,1413,914],{"class":790},[706,1415,979],{"class":786},[706,1417,1418,1421,1423,1425,1428,1430],{"class":708,"line":861},[706,1419,1420],{"class":920},"  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service: 'migrate' },\n})\n\nconst log = createLogger({ task: 'user-migration' })\n\nconst users = await db.query('SELECT * FROM legacy_users')\nlog.set({ found: users.length })\n\nlet migrated = 0\nfor (const user of users) {\n  await newDb.upsert({ id: user.id, email: user.email, plan: user.plan })\n  migrated++\n}\n\nlog.set({ migrated, status: 'complete' })\nlog.emit()\n","scripts\u002Fmigrate-users.ts",[618,1524,1525,1547,1551,1559,1580,1586,1590,1620,1624,1655,1684,1688,1701,1721,1783,1791,1796,1800,1833],{"__ignoreMap":702},[706,1526,1527,1529,1531,1533,1535,1537,1539,1541,1543,1545],{"class":708,"line":709},[706,1528,780],{"class":779},[706,1530,787],{"class":786},[706,1532,816],{"class":790},[706,1534,819],{"class":786},[706,1536,827],{"class":790},[706,1538,794],{"class":786},[706,1540,797],{"class":779},[706,1542,800],{"class":786},[706,1544,803],{"class":715},[706,1546,806],{"class":786},[706,1548,1549],{"class":708,"line":809},[706,1550,886],{"emptyLinePlaceholder":885},[706,1552,1553,1555,1557],{"class":708,"line":840},[706,1554,974],{"class":902},[706,1556,914],{"class":790},[706,1558,979],{"class":786},[706,1560,1561,1563,1565,1567,1569,1571,1573,1576,1578],{"class":708,"line":861},[706,1562,985],{"class":920},[706,1564,924],{"class":786},[706,1566,787],{"class":786},[706,1568,992],{"class":920},[706,1570,924],{"class":786},[706,1572,800],{"class":786},[706,1574,1575],{"class":715},"migrate",[706,1577,1002],{"class":786},[706,1579,1019],{"class":786},[706,1581,1582,1584],{"class":708,"line":882},[706,1583,1034],{"class":786},[706,1585,942],{"class":790},[706,1587,1588],{"class":708,"line":889},[706,1589,886],{"emptyLinePlaceholder":885},[706,1591,1592,1594,1596,1598,1600,1602,1604,1607,1609,1611,1614,1616,1618],{"class":708,"line":945},[706,1593,893],{"class":892},[706,1595,1295],{"class":790},[706,1597,899],{"class":786},[706,1599,827],{"class":902},[706,1601,914],{"class":790},[706,1603,917],{"class":786},[706,1605,1606],{"class":920}," 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email",[706,1757,924],{"class":786},[706,1759,1745],{"class":790},[706,1761,1057],{"class":786},[706,1763,1764],{"class":790},"email",[706,1766,819],{"class":786},[706,1768,1769],{"class":920}," plan",[706,1771,924],{"class":786},[706,1773,1745],{"class":790},[706,1775,1057],{"class":786},[706,1777,1778],{"class":790},"plan",[706,1780,794],{"class":786},[706,1782,942],{"class":920},[706,1784,1785,1788],{"class":708,"line":1051},[706,1786,1787],{"class":790},"  migrated",[706,1789,1790],{"class":786},"++\n",[706,1792,1793],{"class":708,"line":1083},[706,1794,1795],{"class":786},"}\n",[706,1797,1798],{"class":708,"line":1088},[706,1799,886],{"emptyLinePlaceholder":885},[706,1801,1802,1804,1806,1808,1810,1812,1815,1817,1820,1822,1824,1827,1829,1831],{"class":708,"line":1148},[706,1803,1054],{"class":790},[706,1805,1057],{"class":786},[706,1807,1156],{"class":902},[706,1809,914],{"class":790},[706,1811,917],{"class":786},[706,1813,1814],{"class":790}," migrated",[706,1816,819],{"class":786},[706,1818,1819],{"class":920}," status",[706,1821,924],{"class":786},[706,1823,800],{"class":786},[706,1825,1826],{"class":715},"complete",[706,1828,1002],{"class":786},[706,1830,794],{"class":786},[706,1832,942],{"class":790},[706,1834,1835,1837,1839,1841],{"class":708,"line":1175},[706,1836,1054],{"class":790},[706,1838,1057],{"class":786},[706,1840,1182],{"class":902},[706,1842,1216],{"class":790},[696,1844,1847],{"className":698,"code":1845,"filename":1846,"language":701,"meta":702,"style":702},"14:58:15 INFO [migrate] user-migration\n  ├─ migrated: 1250\n  ├─ found: 1250\n  ├─ status: complete\n  └─ task: user-migration\n","Terminal output",[618,1848,1849,1860,1871,1880,1890],{"__ignoreMap":702},[706,1850,1851,1854,1857],{"class":708,"line":709},[706,1852,1853],{"class":712},"14:58:15",[706,1855,1856],{"class":715}," INFO",[706,1858,1859],{"class":790}," [migrate] user-migration\n",[706,1861,1862,1865,1868],{"class":708,"line":809},[706,1863,1864],{"class":712},"  ├─",[706,1866,1867],{"class":715}," migrated:",[706,1869,1870],{"class":934}," 1250\n",[706,1872,1873,1875,1878],{"class":708,"line":840},[706,1874,1864],{"class":712},[706,1876,1877],{"class":715}," found:",[706,1879,1870],{"class":934},[706,1881,1882,1884,1887],{"class":708,"line":861},[706,1883,1864],{"class":712},[706,1885,1886],{"class":715}," status:",[706,1888,1889],{"class":715}," complete\n",[706,1891,1892,1895,1898],{"class":708,"line":882},[706,1893,1894],{"class":712},"  └─",[706,1896,1897],{"class":715}," task:",[706,1899,1900],{"class":715}," user-migration\n",[684,1902,1904],{"id":1903},"error-handling","Error Handling",[614,1906,1907,1908,1911],{},"Use ",[618,1909,1910],{},"createError"," for structured errors:",[696,1913,1915],{"className":769,"code":1914,"filename":771,"language":772,"meta":702,"style":702},"import { createError, parseError } from 'evlog'\n\ntry {\n  const result = await externalApi.sync()\n  if (!result.ok) {\n    throw createError({\n      message: 'Sync failed',\n      why: `API returned ${result.status}`,\n      fix: 'Check the API status page and retry',\n    })\n  }\n} catch (error) {\n  log.error(error instanceof Error ? error : new Error(String(error)))\n  log.emit()\n\n  const { message, why, fix } = parseError(error)\n  console.error(`${message}\\nWhy: ${why}\\nFix: ${fix}`)\n  process.exit(1)\n}\n",[618,1916,1917,1941,1945,1953,1976,1999,2010,2026,2054,2070,2077,2082,2094,2140,2150,2154,2185,2231,2248],{"__ignoreMap":702},[706,1918,1919,1921,1923,1926,1928,1931,1933,1935,1937,1939],{"class":708,"line":709},[706,1920,780],{"class":779},[706,1922,787],{"class":786},[706,1924,1925],{"class":790}," createError",[706,1927,819],{"class":786},[706,1929,1930],{"class":790}," 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if",[706,1982,635],{"class":920},[706,1984,1985],{"class":786},"!",[706,1987,1988],{"class":790},"result",[706,1990,1057],{"class":786},[706,1992,1993],{"class":790},"ok",[706,1995,1996],{"class":920},") ",[706,1998,979],{"class":786},[706,2000,2001,2004,2006,2008],{"class":708,"line":889},[706,2002,2003],{"class":779},"    throw",[706,2005,1925],{"class":902},[706,2007,914],{"class":920},[706,2009,979],{"class":786},[706,2011,2012,2015,2017,2019,2022,2024],{"class":708,"line":945},[706,2013,2014],{"class":920},"      message",[706,2016,924],{"class":786},[706,2018,800],{"class":786},[706,2020,2021],{"class":715},"Sync failed",[706,2023,1002],{"class":786},[706,2025,1028],{"class":786},[706,2027,2028,2031,2033,2036,2039,2042,2044,2046,2049,2052],{"class":708,"line":966},[706,2029,2030],{"class":920},"      why",[706,2032,924],{"class":786},[706,2034,2035],{"class":786}," `",[706,2037,2038],{"class":715},"API returned 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new",[706,2127,2113],{"class":902},[706,2129,914],{"class":920},[706,2131,2132],{"class":902},"String",[706,2134,914],{"class":920},[706,2136,2103],{"class":790},[706,2138,2139],{"class":920},")))\n",[706,2141,2142,2144,2146,2148],{"class":708,"line":1044},[706,2143,2098],{"class":790},[706,2145,1057],{"class":786},[706,2147,1182],{"class":902},[706,2149,1216],{"class":920},[706,2151,2152],{"class":708,"line":1051},[706,2153,886],{"emptyLinePlaceholder":885},[706,2155,2156,2158,2160,2163,2165,2168,2170,2173,2175,2177,2179,2181,2183],{"class":708,"line":1083},[706,2157,1957],{"class":892},[706,2159,787],{"class":786},[706,2161,2162],{"class":790}," message",[706,2164,819],{"class":786},[706,2166,2167],{"class":790}," why",[706,2169,819],{"class":786},[706,2171,2172],{"class":790}," fix",[706,2174,794],{"class":786},[706,2176,1963],{"class":786},[706,2178,1930],{"class":902},[706,2180,914],{"class":920},[706,2182,2103],{"class":790},[706,2184,942],{"class":920},[706,2186,2187,2190,2192,2194,2196,2199,2202,2204,2207,2210,2212,2215,2217,2219,2222,2224,2227,2229],{"class":708,"line":1088},[706,2188,2189],{"class":790},"  console",[706,2191,1057],{"class":786},[706,2193,2103],{"class":902},[706,2195,914],{"class":920},[706,2197,2198],{"class":786},"`${",[706,2200,2201],{"class":790},"message",[706,2203,1034],{"class":786},[706,2205,2206],{"class":790},"\\n",[706,2208,2209],{"class":715},"Why: ",[706,2211,2041],{"class":786},[706,2213,2214],{"class":790},"why",[706,2216,1034],{"class":786},[706,2218,2206],{"class":790},[706,2220,2221],{"class":715},"Fix: ",[706,2223,2041],{"class":786},[706,2225,2226],{"class":790},"fix",[706,2228,2051],{"class":786},[706,2230,942],{"class":920},[706,2232,2233,2236,2238,2241,2243,2246],{"class":708,"line":1148},[706,2234,2235],{"class":790},"  process",[706,2237,1057],{"class":786},[706,2239,2240],{"class":902},"exit",[706,2242,914],{"class":920},[706,2244,2245],{"class":934},"1",[706,2247,942],{"class":920},[706,2249,2250],{"class":708,"line":1175},[706,2251,1795],{"class":786},[684,2253,552],{"id":2254},"configuration",[614,2256,2257,2258,2261,2262,2264],{},"See the ",[633,2259,2260],{"href":553},"Configuration reference"," for all available options (",[618,2263,974],{},", middleware options, sampling, silent mode, etc.).",[684,2266,2268],{"id":2267},"drain-enrichers","Drain & Enrichers",[614,2270,2271,2272,924],{},"Configure drain in ",[618,2273,974],{},[696,2275,2278],{"className":769,"code":2276,"filename":2277,"language":772,"meta":702,"style":702},"import type { DrainContext } from 'evlog'\nimport { initLogger } from 'evlog'\nimport { createAxiomDrain } from 'evlog\u002Faxiom'\nimport { createDrainPipeline } from 'evlog\u002Fpipeline'\n\nconst pipeline = createDrainPipeline\u003CDrainContext>({\n  batch: { size: 50, intervalMs: 5000 },\n  retry: { maxAttempts: 3 },\n})\nconst drain = pipeline(createAxiomDrain())\n\ninitLogger({\n  env: { service: 'my-script' },\n  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3",[706,2424,1019],{"class":786},[706,2426,2427,2429],{"class":708,"line":971},[706,2428,1034],{"class":786},[706,2430,942],{"class":790},[706,2432,2433,2435,2437,2439,2441,2443,2445],{"class":708,"line":982},[706,2434,893],{"class":892},[706,2436,950],{"class":790},[706,2438,899],{"class":786},[706,2440,955],{"class":902},[706,2442,914],{"class":790},[706,2444,960],{"class":902},[706,2446,963],{"class":790},[706,2448,2449],{"class":708,"line":1022},[706,2450,886],{"emptyLinePlaceholder":885},[706,2452,2453,2455,2457],{"class":708,"line":1031},[706,2454,974],{"class":902},[706,2456,914],{"class":790},[706,2458,979],{"class":786},[706,2460,2461,2463,2465,2467,2469,2471,2473,2475,2477],{"class":708,"line":1039},[706,2462,985],{"class":920},[706,2464,924],{"class":786},[706,2466,787],{"class":786},[706,2468,992],{"class":920},[706,2470,924],{"class":786},[706,2472,800],{"class":786},[706,2474,999],{"class":715},[706,2476,1002],{"class":786},[706,2478,1019],{"class":786},[706,2480,2481,2483],{"class":708,"line":1044},[706,2482,1025],{"class":790},[706,2484,1028],{"class":786},[706,2486,2487,2489],{"class":708,"line":1051},[706,2488,1034],{"class":786},[706,2490,942],{"class":790},[627,2492,2257,2493,2495],{"color":1060,"icon":13},[633,2494,153],{"href":158}," docs for all available drain adapters (Axiom, OTLP, PostHog, Sentry, Better Stack).",[627,2497,2499,2500,2505],{"color":629,"icon":2498},"i-lucide-arrow-right","See the full ",[633,2501,2504],{"href":2502,"rel":2503},"https:\u002F\u002Fgithub.com\u002Fevloghq\u002Fevlog\u002Ftree\u002Fmain\u002Fexamples\u002Fbun-script",[677],"bun-script example"," for a complete working script.",[684,2507,2509],{"id":2508},"next-steps","Next Steps",[649,2511,2512,2517,2522,2527,2532],{},[652,2513,2514,2516],{},[633,2515,455],{"href":456},": apply these primitives in a complete HTTP server and trace success and failure from the response to the log.",[652,2518,2519,2521],{},[633,2520,51],{"href":52},": Design comprehensive events with context layering",[652,2523,2524,2526],{},[633,2525,153],{"href":158},": Send logs to Axiom, Sentry, PostHog, and more",[652,2528,2529,2531],{},[633,2530,66],{"href":67},": Control log volume with head and tail 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