How to use the methodFactory function from loglevel

Find comprehensive JavaScript loglevel.methodFactory code examples handpicked from public code repositorys.

loglevel.methodFactory is a method in the loglevel library that creates a custom logging method.

README.md?plain=1

209
210
211
212
213
214
215
216
217
218
There's clearly enough enthusiasm for this even at that cost though that loglevel now includes a plugin API. To use it, redefine log.methodFactory(methodName, logLevel, loggerName) with a function of your own. This will be called for each enabled method each time the level is set (including initially), and should return a function to be used for the given log method, at the given level, for a logger with the given name. If you'd like to retain all the reliability and features of loglevel, it's recommended that this wraps the initially provided value of `log.methodFactory`

For example, a plugin to prefix all log messages with "Newsflash: " would look like:

```javascript
var originalFactory = log.methodFactory;
log.methodFactory = function (methodName, logLevel, loggerName) {
    var rawMethod = originalFactory(methodName, logLevel, loggerName);

    return function (message) {

170

+ 3 other calls in file

logger.js

GitHub: bhovhannes/bundle-validator

5
6
7
8
9
10
11
12
13
14
15
16
if (!['trace', 'debug', 'info', 'warn', 'error'].includes(logLevel)) {
  logger.warn(`Invalid loglevel specified (${logLevel}). Defaulting to 'info'.`)
  logLevel = 'info'
}


const originalFactory = logger.methodFactory
logger.methodFactory = function (methodName, logLevel, loggerName) {
  const rawMethod = originalFactory(methodName, logLevel, loggerName)


  return function (...args) {

+ 3 other calls in file

How does loglevel.methodFactory work?

loglevel.methodFactory is a method in the loglevel library that creates a custom logging method. Here's how it works:

The loglevel library provides a set of default logging methods, such as log(), debug(), info(), warn(), and error().
The loglevel.methodFactory method can be used to create a custom logging method.
The loglevel.methodFactory method takes two arguments: the name of the custom logging method, and a function that defines the behavior of the custom logging method.
The function passed as the second argument to loglevel.methodFactory should return a function that accepts one or more arguments and logs them using the desired format.
The custom logging method created by loglevel.methodFactory can then be used in the same way as the default logging methods provided by the loglevel library.

Here is an example of using loglevel.methodFactory to create a custom logging method:

javascript
import log from 'loglevel';

function customLoggerFactory(name) {
  return function(...args) {
    log.info(`[${name}]`, ...args);
  };
}

log.methodFactory = customLoggerFactory;

const customLogger = log.methodFactory('custom');

customLogger('This is a custom log message.');
// Output: [custom] This is a custom log message.

In this example, we define a function customLoggerFactory that takes a name argument and returns a function that logs messages with the format [name] message.

We then set log.methodFactory to customLoggerFactory, so that the loglevel library will use customLoggerFactory to create custom logging methods.

We use log.methodFactory('custom') to create a custom logging method called customLogger.

Finally, we use customLogger to log a message with the format [custom] message using the loglevel library.

logger.cjs

GitHub: andystevenson/lib

27
28
29
30
31
32
33
34
35
36
37
38


const isString = (arg) => typeof arg === 'string' || arg instanceof String
// configure logger
const verbose = false
const configure = (options = { verbose, colors }) => {
  const original = log.methodFactory
  log.methodFactory = function (method, level, name) {
    var raw = original(method, level, name)


    return function () {

+ 6 other calls in file

common.js

GitHub: transitiverobotics/transitive-utils

29
30
31
32
33
34
35
36
37
38
39
40
};
const coloredMethod = (method) =>
  methodColors[method] ? methodColors[method](method) : method;


// patch the methodFactory to prefix logs with name and level
const originalFactory = loglevel.methodFactory;
loglevel.methodFactory = (methodName, level, loggerName) => {
  const rawMethod = originalFactory(methodName, level, loggerName);


  if (typeof window != 'undefined') {

Ai Example

1
2
3
4
5
6
7
8
9
10
11
12
13
14
import log from "loglevel";

function customLoggerFactory(name) {
  return function (...args) {
    log.info(`[${name}]`, ...args);
  };
}

log.methodFactory = customLoggerFactory;

const customLogger = log.methodFactory("custom");

customLogger("This is a custom log message.");
// Output: [custom] This is a custom log message.

In this example, we define a function customLoggerFactory that takes a name argument and returns a function that logs messages with the format [name] message. We then set log.methodFactory to customLoggerFactory, so that the loglevel library will use customLoggerFactory to create custom logging methods. We use log.methodFactory('custom') to create a custom logging method called customLogger. Finally, we use customLogger to log a message with the format [custom] message using the loglevel library.

logger.js

GitHub: sshwy/clapping-backend

18
19
20
21
22
23
24
25
26
27
28
  format (level, name, timestamp) {
    return `${chalk.gray(`[${timestamp}]`)} ${colors[level.toUpperCase()](level)} ${chalk.green(`(${name}):`)}`;
  },
})


const originalFactory = logger.methodFactory;
logger.methodFactory = function (methodName, logLevel, loggerName) {
  var rawMethod = originalFactory(methodName, logLevel, loggerName);
  return function (message) {

Other functions in loglevel

Sorted by popularity

loglevel.debug is the most popular function in loglevel (1470 examples)

Other popular packages:

Home

About