Gives the stack for name of file and line number.

debug w stack

const v = require('debug')('verbose');
const e = require('debug')('error');
const w = require('debug')('warning');

const buildStack = () => {
  const depth = 3;
  if (!this.stackIs) {
    Object.defineProperty(this, 'stackIs', {
      get: function() {
        const orig = Error.prepareStackTrace;
        Error.prepareStackTrace = function(_, stack) {
          return stack;
        };
        const err = new Error();
        Error.captureStackTrace(err, arguments.callee);
        const stack = err.stack;
        Error.prepareStackTrace = orig;
        return stack;
      },
    });
  }

  if (!this.lineIs) {
    Object.defineProperty(this, 'lineIs', {
      get: function() {
        return this.stackIs[depth].getLineNumber();
      },
    });
  }

  if (!this.functionIs) {
    Object.defineProperty(this, 'functionIs', {
      get: function() {
        return this.stackIs[depth].getFunctionName();
      },
    });
  }

  return {
    function: this.functionIs,
    line: this.lineIs,
  };
};

/**
 * base the functions to apply debugging
 */
const debug = {
  verbose: msg => v(msg, buildStack()),
  error: msg => e(msg, buildStack()),
  warning: msg => w(msg, buildStack()),
};

function bar() {
  debug.verbose('name->bar');
  baz();
}

const foo = thing => {
  debug.verbose('name->foo')
  thing();
}

const baz = () => {
  debug.verbose('name->baz');
}

foo(bar);