(that: LogLevel): (self: LogLevel) => boolean
(self: LogLevel, that: LogLevel): booleanDetermines if the first log level is less severe than the second.
When to use
Use to check whether one log level is strictly less severe than another.
Details
Returns true if self represents a less severe level than that.
Example (Checking lower severity)
import { LogLevel } from "effect"
// Check if Debug is less severe than Info
console.log(LogLevel.isLessThan("Debug", "Info")) // true
console.log(LogLevel.isLessThan("Error", "Info")) // false
// Filter out verbose logs
const isFatalVerbose = LogLevel.isLessThan("Fatal", "Info")
const isErrorVerbose = LogLevel.isLessThan("Error", "Info")
const isTraceVerbose = LogLevel.isLessThan("Trace", "Info")
console.log(isFatalVerbose) // false (Fatal is not verbose)
console.log(isErrorVerbose) // false (Error is not verbose)
console.log(isTraceVerbose) // true (Trace is verbose)
// Curried usage
const isLessSevereThanError = LogLevel.isLessThan("Error")
console.log(isLessSevereThanError("Info")) // true
console.log(isLessSevereThanError("Fatal")) // falseexport const const isLessThan: {
(that: LogLevel): (self: LogLevel) => boolean
(self: LogLevel, that: LogLevel): boolean
}
Determines if the first log level is less severe than the second.
When to use
Use to check whether one log level is strictly less severe than another.
Details
Returns true if self represents a less severe level than that.
Example (Checking lower severity)
import { LogLevel } from "effect"
// Check if Debug is less severe than Info
console.log(LogLevel.isLessThan("Debug", "Info")) // true
console.log(LogLevel.isLessThan("Error", "Info")) // false
// Filter out verbose logs
const isFatalVerbose = LogLevel.isLessThan("Fatal", "Info")
const isErrorVerbose = LogLevel.isLessThan("Error", "Info")
const isTraceVerbose = LogLevel.isLessThan("Trace", "Info")
console.log(isFatalVerbose) // false (Fatal is not verbose)
console.log(isErrorVerbose) // false (Error is not verbose)
console.log(isTraceVerbose) // true (Trace is verbose)
// Curried usage
const isLessSevereThanError = LogLevel.isLessThan("Error")
console.log(isLessSevereThanError("Info")) // true
console.log(isLessSevereThanError("Fatal")) // false
isLessThan: {
(that: LogLevelthat: type LogLevel =
| "All"
| "Fatal"
| "Error"
| "Warn"
| "Info"
| "Debug"
| "Trace"
| "None"
Represents every level used by Effect logging, including concrete message
severities and the All and None sentinel levels.
When to use
Use to type values that may be either concrete log message severities or
logging configuration sentinels.
Details
The levels are ordered from most severe to least severe:
All - Special level that allows all messagesFatal - System is unusable, immediate attention requiredError - Error conditions that should be investigatedWarn - Warning conditions that may indicate problemsInfo - Informational messages about normal operationDebug - Debug information useful during developmentTrace - Very detailed trace informationNone - Special level that suppresses all messages
Example (Using log levels)
import { Effect } from "effect"
// Using log levels with Effect logging
const program = Effect.gen(function*() {
yield* Effect.logFatal("System failure")
yield* Effect.logError("Database error")
yield* Effect.logWarning("High memory usage")
yield* Effect.logInfo("User logged in")
yield* Effect.logDebug("Processing request")
yield* Effect.logTrace("Variable state")
})
// Type-safe log level variables
const errorLevel = "Error" // LogLevel
const debugLevel = "Debug" // LogLevel
LogLevel): (self: LogLevelself: type LogLevel =
| "All"
| "Fatal"
| "Error"
| "Warn"
| "Info"
| "Debug"
| "Trace"
| "None"
Represents every level used by Effect logging, including concrete message
severities and the All and None sentinel levels.
When to use
Use to type values that may be either concrete log message severities or
logging configuration sentinels.
Details
The levels are ordered from most severe to least severe:
All - Special level that allows all messagesFatal - System is unusable, immediate attention requiredError - Error conditions that should be investigatedWarn - Warning conditions that may indicate problemsInfo - Informational messages about normal operationDebug - Debug information useful during developmentTrace - Very detailed trace informationNone - Special level that suppresses all messages
Example (Using log levels)
import { Effect } from "effect"
// Using log levels with Effect logging
const program = Effect.gen(function*() {
yield* Effect.logFatal("System failure")
yield* Effect.logError("Database error")
yield* Effect.logWarning("High memory usage")
yield* Effect.logInfo("User logged in")
yield* Effect.logDebug("Processing request")
yield* Effect.logTrace("Variable state")
})
// Type-safe log level variables
const errorLevel = "Error" // LogLevel
const debugLevel = "Debug" // LogLevel
LogLevel) => boolean
(self: LogLevelself: type LogLevel =
| "All"
| "Fatal"
| "Error"
| "Warn"
| "Info"
| "Debug"
| "Trace"
| "None"
Represents every level used by Effect logging, including concrete message
severities and the All and None sentinel levels.
When to use
Use to type values that may be either concrete log message severities or
logging configuration sentinels.
Details
The levels are ordered from most severe to least severe:
All - Special level that allows all messagesFatal - System is unusable, immediate attention requiredError - Error conditions that should be investigatedWarn - Warning conditions that may indicate problemsInfo - Informational messages about normal operationDebug - Debug information useful during developmentTrace - Very detailed trace informationNone - Special level that suppresses all messages
Example (Using log levels)
import { Effect } from "effect"
// Using log levels with Effect logging
const program = Effect.gen(function*() {
yield* Effect.logFatal("System failure")
yield* Effect.logError("Database error")
yield* Effect.logWarning("High memory usage")
yield* Effect.logInfo("User logged in")
yield* Effect.logDebug("Processing request")
yield* Effect.logTrace("Variable state")
})
// Type-safe log level variables
const errorLevel = "Error" // LogLevel
const debugLevel = "Debug" // LogLevel
LogLevel, that: LogLevelthat: type LogLevel =
| "All"
| "Fatal"
| "Error"
| "Warn"
| "Info"
| "Debug"
| "Trace"
| "None"
Represents every level used by Effect logging, including concrete message
severities and the All and None sentinel levels.
When to use
Use to type values that may be either concrete log message severities or
logging configuration sentinels.
Details
The levels are ordered from most severe to least severe:
All - Special level that allows all messagesFatal - System is unusable, immediate attention requiredError - Error conditions that should be investigatedWarn - Warning conditions that may indicate problemsInfo - Informational messages about normal operationDebug - Debug information useful during developmentTrace - Very detailed trace informationNone - Special level that suppresses all messages
Example (Using log levels)
import { Effect } from "effect"
// Using log levels with Effect logging
const program = Effect.gen(function*() {
yield* Effect.logFatal("System failure")
yield* Effect.logError("Database error")
yield* Effect.logWarning("High memory usage")
yield* Effect.logInfo("User logged in")
yield* Effect.logDebug("Processing request")
yield* Effect.logTrace("Variable state")
})
// Type-safe log level variables
const errorLevel = "Error" // LogLevel
const debugLevel = "Debug" // LogLevel
LogLevel): boolean
} = import OrdOrd.const isLessThan: <A>(O: Order<A>) => {
(that: A): (self: A) => boolean
(self: A, that: A): boolean
}
Checks whether one value is strictly less than another according to the given order.
When to use
Use when you need a boolean less-than predicate using an Order.
Details
Returns true if the order returns -1, meaning the first value is less
than the second. Equal or greater values return false.
Example (Checking less-than comparisons)
import { Order } from "effect"
const isLessThanNumber = Order.isLessThan(Order.Number)
console.log(isLessThanNumber(1, 2)) // true
console.log(isLessThanNumber(2, 1)) // false
console.log(isLessThanNumber(1, 1)) // false
isLessThan(const Order: Ord.Order<LogLevel>Order instance for LogLevel that defines the severity ordering.
When to use
Use to sort or compare log levels according to Effect's severity order.
Details
This order treats "All" as the least restrictive level and "None" as the most restrictive,
with Fatal being the most severe actual log level.
Example (Ordering log levels)
import { LogLevel } from "effect"
// Compare log levels using Order
console.log(LogLevel.Order("Error", "Info")) // 1 (Error > Info)
console.log(LogLevel.Order("Debug", "Error")) // -1 (Debug < Error)
console.log(LogLevel.Order("Info", "Info")) // 0 (Info == Info)
Order)