xpozr

Super simple AOP-like tracing module for Javascript.

Supports:

• Async functions
• Functions returning Promises
• Synchronous functions
• Synchronous functions with callbacks
  • supports callbacks with multiple result arguments (eg: cb(err, result), cb(err, result1, result2) etc.)

Usage

• A test class:

module.exports = class TestWidget {

    constructor(){}

    getWidget(id) {
        return {
            "id": id,
            "name": "My test widget"
        }
    }
}

• Create an instance of the object you would like to wrap, eg:

let widget = new TestWidget();

• Wrap the object, which will add extensive argument and result logging for every function in the object

const Xpozr = require('xpozr');
let xpozr = new Xpozr();

let wrappedWidget = xpozr.trace(widget);

• You can use the wrapped object exactly as you normally would:

let result = wrappedWidget.getWidget(2);

• The console output will be:

~~~~~~~~~~~~~~~~~~ START trace 'Object.getWidget' ~~~~~~~~~~~~~~~~~~
- function type: synchronous
- function name: getWidget
- start: 1588751615686
- end: 1588751615686
- duration:  0ms
- args:  [ 2 ]
- result:  { id: 2, name: 'My test widget' }
~~~~~~~~~~~~~~~~~~ END trace 'Object.getWidget' ~~~~~~~~~~~~~~~~~~

• See the tests (in /test) for more examples