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Trace,
Debug,
Info,
Log,
Warn,
Error,
Silent
}
export type ConsoleMethods = 'trace' | 'debug' | 'info' | 'log' | 'warn' | 'error';
let globalLogLevel: LogLevel = LogLevel.Log;
let isNodeEnv: boolean = false;
declare const window: undefined | Window;
if (typeof window !== 'undefined' && typeof window.location !== 'undefined') {
if (window.location.search.indexOf('debug=') !== -1) {
const level = parseInt(window.location.search.split('debug=')[1].split('&')[0], 10);
if (typeof LogLevel[level] !== 'undefined') {
globalLogLevel = level;
}
} else if (window.location.search.indexOf('debug') !== -1) {
globalLogLevel = LogLevel.Debug;
}
}
declare const process: undefined | NodeJS.Process;
if (typeof process !== 'undefined' && typeof process.env !== 'undefined') {
isNodeEnv = true;
globalLogLevel = LogLevel.Log;
if (typeof process.env.DEBUG !== 'undefined') {
globalLogLevel = LogLevel.Trace;
}
}
const stylePlaceholder = isNodeEnv ? '' : '%c';
// Set to silent for testing
if (
typeof process !== 'undefined' &&
typeof process.env !== 'undefined' &&
process.env.NODE_ENV === 'test'
) {
globalLogLevel = LogLevel.Silent;
}
const levelStrings: string[] = [
'Trace',
'Debug',
'Info',
'Log',
'Warn',
'Error',
];
const maxLevelStringLen: number = levelStrings.reduce(
(len, str) => str.length > len ? str.length : len,
0
);
const resetStyleString = '\x1B[m';
const baseLevelStyleString = 'color:{color};font-weight:bold;';
const nameStyleString = 'color:white;';
const levelStyles: string[] = [
'grey',
'white',
'lightblue',
'lightgreen',
'orange',
'red',
].map(color => baseLevelStyleString.replace(/\{color\}/g, color));
let maxLoggerNameLen: number = 0;
type logArguments = [ string, ...unknown[] ];
class Logger {
name: string;
level: LogLevel = LogLevel.Error;
maxLevelStringLen = 5;
constructor(name: string) {
this.name = name;
}
setLevel(level: LogLevel) {
globalLogLevel = level;
}
buildAlert(msg: string) {} // eslint-disable-line @typescript-eslint/no-unused-vars
printLog(level: LogLevel, method: ConsoleMethods, ...args: logArguments) {
// Build an alert if this is an error
if (level === LogLevel.Error) {
this.buildAlert(args[0]);
}
// Exit early if we shouldn't print this log
if (globalLogLevel > level) {
return;
}
// Build the logger name portion
const loggerNameStr = isNodeEnv
? this.name
: this.name.padEnd(maxLoggerNameLen, ' ');
const loggerName = `[ ${stylePlaceholder}${loggerNameStr}${stylePlaceholder} ]`;
let styles: string[] = [
levelStyles[level],
resetStyleString,
];
// Build the first portion of the log
let logPrefix = '';
if (!isNodeEnv) {
logPrefix = `${level < LogLevel.Error ? ' ' : ''}[ ${stylePlaceholder}${levelStrings[level].padEnd(maxLevelStringLen, ' ')}${stylePlaceholder} ]`;
if (level !== LogLevel.Trace) {
styles.push(
nameStyleString,
resetStyleString
);
}
} else {
styles = [];
}
logPrefix += loggerName;
// Build the argument array
const consoleArgs: [
string,
...unknown[]
] = [
logPrefix,
...styles,
...args,
];
// Remove the title for trace
if (level === LogLevel.Trace) {
consoleArgs.splice(0, 1, loggerName);
}
// Pass it to the console
console[method](...consoleArgs);
}
trace(...args: logArguments) {
this.printLog(LogLevel.Trace, 'trace', ...args);
}
debug(...args: logArguments) {
this.printLog(LogLevel.Debug, 'debug', ...args);
}
info(...args: logArguments) {
this.printLog(LogLevel.Info, 'info', ...args);
}
log(...args: logArguments) {
this.printLog(LogLevel.Log, 'log', ...args);
}
warn(...args: logArguments) {
this.printLog(LogLevel.Warn, 'warn', ...args);
}
error(...args: logArguments) {
this.printLog(LogLevel.Error, 'error', ...args);
}
}
const loggers: { [key: string]: Logger } = {};
export function getLogger(name: string): Logger {
if (typeof loggers[name] === 'undefined') {
loggers[name] = new Logger(name);
if (name.length > maxLoggerNameLen) {
maxLoggerNameLen = name.length;
}
}
return loggers[name];
}
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