kidnap-console

• Makes console log output testing a breeze.

• Capture log output by wrapping functions that do console calls.

• Stores both of the following from each wrapped function:

  • 1. All values that get passed to console.log, console.warn, console.dir, or console.error;
  • 2. Return value of the function.

• Prevents log from displaying on the console

Purpose

• Unit testing of console output
  • (None of the existing solutions to this were really working for me)

Installation

yarn add --dev kidnap-console

Or:

npm install --save-dev kidnap-console

Usage

Example 1:

// You can also import kidnapLogs or kidnapConsole. They are aliases.
import { blockLogOutput } from 'kidnap-console';

const capturedLogs = blockLogOutput(() => console.log('try to log this'));
// [[no output to console occurs]]

console.log(capturedLogs.stores.log);
// => ['try to log this']

Example 2:

function logThings() {
    console.dir('hello dir');
    console.log('hello log');
    console.warn('hello warn');
    console.error('hello error');
    return 'my return value';
}

const capturedLogs = blockLogOutput(logThings); 
// [[no output to console occurs]]

//
// Captures the return value of the function
//
console.log(capturedLogs.result);
// => 'my return value'

console.log(capturedLogs.stores.log);
// => ['hello log']

console.log(capturedLogs.stores.dir);
// => ['hello dir']

console.log(capturedLogs.stores.warn);
// => ['hello warn']

console.log(capturedLogs.stores.error);
// => ['hello error']