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export class Logger<T extends Record<PropertyKey, unknown> = {}> {
constructor({ level, format, output, tags, ...options } = {} as LoggerOptions<T>) {
if (globalThis.Deno?.permissions.querySync?.({ name: "env", variable: "LOG_LEVEL" }).state === "granted") {
level ??= globalThis.Deno?.env.get("LOG_LEVEL") as LoggerOptions<T>["level"]
}
this.#output = output || (output === null) ? output : console
this.#level = Logger.level.log as level
this.#format = Logger.format.text as formatter
this.#options = { date: false, time: false, delta: true, caller: { file: false, name: false, line: false, fileformat: null } }
this.level(level).format(format).options(options)
this.tags = (tags ?? {}) as Logger<T>["tags"]
}
readonly #output
#options: options
options(): options
options(options: LoggerOptions<T>): this
options(options?: LoggerOptions<T>): this | options {
if (!options) {
return structuredClone(this.#options)
}
if ("date" in options) {
this.#options.date = options.date
}
if ("time" in options) {
this.#options.time = options.time
}
if ("delta" in options) {
this.#options.delta = options.delta
}
if ("caller" in options) {
switch (true) {
case options.caller === true:
this.#options.caller = { file: true, name: true, line: true, fileformat: this.#options.caller.fileformat }
break
case options.caller === false:
this.#options.caller = { file: false, name: false, line: false, fileformat: this.#options.caller.fileformat }
break
case typeof options.caller === "object":
if ("file" in options.caller) {
this.#options.caller.file = options.caller.file
}
if ("name" in options.caller) {
this.#options.caller.name = options.caller.name
}
if ("line" in options.caller) {
this.#options.caller.line = options.caller.line
}
if (("fileformat" in options.caller) && (typeof options.caller.fileformat !== "undefined")) {
this.#options.caller.fileformat = options.caller.fileformat
}
}
}
return this
}
#level
level(): level
level(level: LoggerOptions<T>["level"]): this
level(level?: LoggerOptions<T>["level"]): this | level {
if (!arguments.length) {
return this.#level >= 0 ? this.#level : NaN
}
if (!Number.isNaN(Number.parseInt(`${level}`))) {
level = Number.parseInt(`${level}`)
}
if ((typeof level === "string") && (level in Logger.level)) {
level = Logger.level[level]
}
if (typeof level === "number") {
this.#level = (!Number.isNaN(level)) && (level >= 0) ? level : -1
}
return this
}
static readonly level = Object.freeze({
disabled: NaN,
error: 0,
warn: 1,
info: 2,
ok: 2,
log: 3,
debug: 4,
wdebug: 4,
trace: 5,
probe: NaN,
always: Infinity,
}) as Readonly<{
disabled: number
error: 0
warn: 1
info: 2
ok: 2
log: 3
debug: 4
wdebug: 4
trace: 5
probe: number
always: number
}>
error(...content: unknown[]): this {
if (this.#level >= Logger.level.error) {
this.#output?.error(...this.#format(this, { level: "error", content, options: this.#options }))
}
return this
}
warn(...content: unknown[]): this {
if (this.#level >= Logger.level.warn) {
this.#output?.warn(...this.#format(this, { level: "warn", content, options: this.#options }))
}
return this
}
info(...content: unknown[]): this {
if (this.#level >= Logger.level.info) {
this.#output?.info(...this.#format(this, { level: "info", content, options: this.#options }))
}
return this
}
ok(...content: unknown[]): this {
if (this.#level >= Logger.level.info) {
this.#output?.info(...this.#format(this, { level: "ok", content, options: this.#options }))
}
return this
}
log(...content: unknown[]): this {
if (this.#level >= Logger.level.log) {
this.#output?.log(...this.#format(this, { level: "log", content, options: this.#options }))
}
return this
}
debug(...content: unknown[]): this {
if (this.#level >= Logger.level.debug) {
this.#output?.debug(...this.#format(this, { level: "debug", content, options: this.#options }))
}
return this
}
wdebug(...content: unknown[]): this {
if (this.#level >= Logger.level.debug) {
this.#output?.debug(...this.#format(this, { level: "wdebug", content, options: this.#options }))
}
return this
}
trace(...content: unknown[]): this {
if (this.#level >= Logger.level.trace) {
this.#output?.debug(...this.#format(this, { level: "trace", content, options: this.#options }))
}
return this
}
probe(...content: unknown[]): this {
this.#output?.debug(...this.#format(this, { level: "probe", content, options: this.#options }))
return this
}
readonly tags: DeepReadonly<T>
with<U extends Record<PropertyKey, unknown>>(tags = {} as U): Logger<T & U> {
return new Logger({ level: this.#level, format: this.#format, output: this.#output, ...this.#options, tags: { ...this.tags, ...tags } as T & U })
}
#caller(i = 3 ) {
const Trace = Error as unknown as { prepareStackTrace: (error: Error, stack: CallSite[]) => unknown }
const _ = Trace.prepareStackTrace
Trace.prepareStackTrace = (_, stack) => stack
const { stack } = new Error()
Trace.prepareStackTrace = _
const callers = (stack as unknown as CallSite[]).map((callsite) => ({
file: callsite.getFileName(),
name: callsite.getFunctionName(),
line: callsite.getLineNumber(),
column: callsite.getColumnNumber(),
})) as caller[]
return callers[i]
}
static inspect(value: unknown): unknown {
return globalThis.Deno?.inspect(value, { colors: true, depth: Infinity, strAbbreviateSize: Infinity }) ?? value
}
#format
format(format: LoggerOptions<T>["format"]): this {
this.#format = (typeof format === "string" ? Logger.format[format] : format) ?? Logger.format.text
return this
}
static readonly format = {
text(logger: Logger, { level, content, options }) {
const color = { error: "red", warn: "orange", info: "cyan", ok: "green", log: "white", debug: "gray", wdebug: "yellow", trace: "gray", probe: "magenta" }[level]
const text = [`%c ${level.replace("wdebug", "debug").toLocaleUpperCase().padEnd(5)} │%c`]
const styles = [`color: black; background-color: ${color}`, ""]
if ((options.date) || (options.time) || (options.delta)) {
const date = new Date().toISOString()
const tag = []
if (options.delta) {
const d = performance.now() / 1000
let dt = d.toPrecision(4)
if (d < 1) {
dt = d.toPrecision(2)
}
tag.push(`+${dt}`)
}
if ((options.date) && (options.time)) {
tag.push(date)
} else if (options.date) {
tag.push(date.slice(0, date.indexOf("T")))
} else if (options.time) {
tag.push(date.slice(date.indexOf("T") + 1, -1))
}
text.push(`%c ${tag.join(" ¦ ").trim()} %c`)
styles.push(`color: black; background-color: ${color}`, "")
}
if (options.caller.file || options.caller.name || options.caller.line) {
const caller = logger.#caller()
if (caller) {
const tag = []
if (options.caller.file) {
let file = `${caller.file}`
if (Array.isArray(options.caller.fileformat)) {
file = file.replace(options.caller.fileformat[0], options.caller.fileformat[1])
}
tag.push(file)
}
if ((options.caller.name) && (caller.name)) {
tag.push(caller.name)
}
if (options.caller.line) {
tag.push(caller.line, caller.column)
}
text.push(`%c ${tag.join(":").trim()} %c`)
styles.push(`color: black; background-color: gray`, "")
}
}
const tags = []
for (const [key, value] of Object.entries(logger.tags)) {
tags.push(`${key}:${Logger.inspect(value)}`)
}
text.push(`%c ${tags.join(" ").trim()} %c`)
styles.push(`background-color: black`, "")
return [text.join(""), ...styles, ...content.map(Logger.inspect)]
},
json(logger: Logger, { level, content, options }) {
const data = {
level,
timestamp: Date.now(),
tags: logger.tags,
content,
}
const extra = {} as { date?: string; time?: string; delta?: number; caller?: { file?: string; name?: string; line?: [number, number] } }
if ((options.date) || (options.time)) {
const date = new Date(data.timestamp).toISOString()
if ((options.date)) {
extra.date = date.slice(0, date.indexOf("T"))
}
if ((options.time)) {
extra.time = date.slice(date.indexOf("T") + 1, -1)
}
}
if (options.delta) {
extra.delta = performance.now() / 1000
}
if (options.caller.file || options.caller.name || options.caller.line) {
const caller = logger.#caller()
if (caller) {
extra.caller = {}
if (options.caller.file) {
let file = `${caller.file}`
if (Array.isArray(options.caller.fileformat)) {
file = file.replace(options.caller.fileformat[0], options.caller.fileformat[1])
}
extra.caller.file = file
}
if ((options.caller.name) && (caller.name)) {
extra.caller.name = caller.name
}
if (options.caller.line) {
extra.caller.line = [caller.line, caller.column]
}
}
}
return [JSON.stringify({ ...data, ...extra })]
},
} as Record<PropertyKey, formatter>
}
export type LoggerOptions<T extends Record<PropertyKey, unknown> = {}> = {
level?: levellike
format?: formatter | "text" | "json"
output?: Nullable<Record<"error" | "warn" | "info" | "log" | "debug", Function>>
tags?: T
caller?: {
file?: boolean
name?: boolean
line?: boolean
fileformat?: Nullable<[RegExp, string]>
} | boolean
date?: boolean
time?: boolean
delta?: boolean
}
export type options = DeepNonNullable<Pick<LoggerOptions, "date" | "time" | "delta">> & {
caller: DeepNonNullable<Omit<NonNullable<Exclude<LoggerOptions["caller"], boolean>>, "fileformat">> & { fileformat: Nullable<[RegExp, string]> }
}
export type level = number
export type loglevel = Exclude<keyof typeof Logger.level, "disabled" | "always">
export type levellike = level | loglevel | "disabled" | "always"
export type formatter = (logger: Logger, options: { level: loglevel; content: unknown[]; options: options }) => unknown[]
type caller = {
file: string
name: Nullable<string>
line: number
column: number
}
type CallSite = {
getFileName: () => string
getFunctionName: () => Nullable<string>
getLineNumber: () => number
getColumnNumber: () => number
}
export type Nullable<T> = T | null
export type DeepReadonly<T> = T extends object ? { readonly [P in keyof T]: DeepReadonly<T[P]> } : T
export type DeepNonNullable<T> = { [P in keyof T]: T[P] extends object ? DeepNonNullable<NonNullable<T[P]>> : NonNullable<T[P]> }
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