safe-log-error v1.0.0

safe-log-error

SafeLogError is an Error. A JS Error wrapper that limits err.message to some fixed length if the same error has been seen in a time window.
The "same" error is defined either by the same exact message, or the same message plus the same stack, or with a user defined callback that decides uniqueness.

format reformats (err.message, err.stack). If not provided, we split the err.message by:

str.slice(0, 120) + nearest function call in the stack

120 is chosen arbitrarily in SafeLogError while It is generally a good length of a line (Word wrap in IDEs)

unique is uniqueness function. If not provided, we calculate:

err.message + err.stack

The return object is a "safe to log" error object. Stack is left intact ! You are supposed to only log the message (knowing the purpose of this !)

Example

const { SafeLogError } = require(".");

// Example
function test(safeLogger1) {
  try {
      null.f()
  } catch (error) {
      throw new safeLogger1(error);
  }

}
const unique = (message, stack) => message + stack
let format = (message, stack) => message.slice(0, 120) + '\t' +stack.split('at')[1].trim()
let window = 100 // milliseconds
const safeLogger1 = SafeLogError(window, format, unique)
for (let index = 0; index < 100; index++) {
  try {
      test(safeLogger1);
  } catch (err) {
      console.log(err.message);
  }
}

License

author

A.B. 2022
MIT