Swadhin Biswas feat: implement mervelas cli engine, built-in tools, and reactive UI · 4/3/2026
0358986
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
import { posix, win32 } from 'path'
import {
type AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
logEvent,
} from 'src/services/analytics/index.js'
import { logForDebugging } from './debug.js'
import { isEnvTruthy } from './envUtils.js'
import { getPlatform } from './platform.js'
// Track warnings to avoid spam — bounded to prevent unbounded memory growth
export const MAX_WARNING_KEYS = 1000
const warningCounts = new Map<string, number>()
// Check if running from a build directory (development mode)
// This is a sync version of the logic in getCurrentInstallationType()
function isRunningFromBuildDirectory(): boolean {
let invokedPath = process.argv[1] || ''
let execPath = process.execPath || process.argv[0] || ''
// On Windows, convert backslashes to forward slashes for consistent path matching
if (getPlatform() === 'windows') {
invokedPath = invokedPath.split(win32.sep).join(posix.sep)
execPath = execPath.split(win32.sep).join(posix.sep)
}
const pathsToCheck = [invokedPath, execPath]
const buildDirs = [
'/build-ant/',
'/build-external/',
'/build-external-native/',
'/build-ant-native/',
]
return pathsToCheck.some(path => buildDirs.some(dir => path.includes(dir)))
}
// Warnings we know about and want to suppress from users
const INTERNAL_WARNINGS = [
/MaxListenersExceededWarning.*AbortSignal/,
/MaxListenersExceededWarning.*EventTarget/,
]
function isInternalWarning(warning: Error): boolean {
const warningStr = `${warning.name}: ${warning.message}`
return INTERNAL_WARNINGS.some(pattern => pattern.test(warningStr))
}
// Store reference to our warning handler so we can detect if it's already installed
let warningHandler: ((warning: Error) => void) | null = null
// For testing only - allows resetting the warning handler state
export function resetWarningHandler(): void {
if (warningHandler) {
process.removeListener('warning', warningHandler)
}
warningHandler = null
warningCounts.clear()
}
export function initializeWarningHandler(): void {
// Only set up handler once - check if our handler is already installed
const currentListeners = process.listeners('warning')
if (warningHandler && currentListeners.includes(warningHandler)) {
return
}
// For external users, remove default Node.js handler to suppress stderr output
// For internal users, only keep default warnings for development builds
// Check development mode directly to avoid async call in init
// This preserves the same logic as getCurrentInstallationType() without async
const isDevelopment =
process.env.NODE_ENV === 'development' || isRunningFromBuildDirectory()
if (!isDevelopment) {
process.removeAllListeners('warning')
}
// Create and store our warning handler
warningHandler = (warning: Error) => {
try {
const warningKey = `${warning.name}: ${warning.message.slice(0, 50)}`
const count = warningCounts.get(warningKey) || 0
// Bound the map to prevent unbounded memory growth from unique warning keys.
// Once the cap is reached, new unique keys are not tracked — their
// occurrence_count will always be reported as 1 in analytics.
if (
warningCounts.has(warningKey) ||
warningCounts.size < MAX_WARNING_KEYS
) {
warningCounts.set(warningKey, count + 1)
}
const isInternal = isInternalWarning(warning)
// Always log to Statsig for monitoring
// Include full details for ant users only, since they may contain code or filepaths
logEvent('tengu_node_warning', {
is_internal: isInternal ? 1 : 0,
occurrence_count: count + 1,
classname:
warning.name as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
...(process.env.USER_TYPE === 'ant' && {
message:
warning.message as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
}),
})
// In debug mode, show all warnings with context
if (isEnvTruthy(process.env.CLAUDE_DEBUG)) {
const prefix = isInternal ? '[Internal Warning]' : '[Warning]'
logForDebugging(`${prefix} ${warning.toString()}`, { level: 'warn' })
}
// Hide all warnings from users - they are only logged to Statsig for monitoring
} catch {
// Fail silently - we don't want the warning handler to cause issues
}
}
// Install the warning handler
process.on('warning', warningHandler)
}