e is not a function

[abhinavkumar940]

Expected behavior

It should open the picker

Actual behavior

Throws error e is not a function

Steps to reproduce

Follow the first example on README.md on stackblitz

Stackblitz url

https://stackblitz.com/edit/react-tj1xzt

Error details

TypeError: e is not a function
    at eval (react-datepicker.min.js:1)
    at eval (react-datepicker.min.js:1)
    at n.a.formatWeekNumber (react-datepicker.min.js:1)
    at n.a.renderDays (react-datepicker.min.js:1)
    at n.render (react-datepicker.min.js:1)
    at finishClassComponent (react-dom.development.js:13393)
    at updateClassComponent (react-dom.development.js:13356)
    at beginWork (react-dom.development.js:13945)
    at performUnitOfWork (react-dom.development.js:16249)
    at workLoop (react-dom.development.js:16287)

Code

import React, { Component } from 'react';
import { render } from 'react-dom';
import DatePicker from "react-datepicker";

import "react-datepicker/dist/react-datepicker.css";

// CSS Modules, react-datepicker-cssmodules.css
// import 'react-datepicker/dist/react-datepicker-cssmodules.css';

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      startDate: new Date()
    };
    this.handleChange = this.handleChange.bind(this);
  }

  handleChange(date) {
    this.setState({
      startDate: date
    });
  }

  render() {
    return (
      <DatePicker
        selected={this.state.startDate}
        onChange={this.handleChange}
      />
    );
  }
}

render(<App />, document.getElementById('root'));

[ossiv]

I am also seeing this error, and I am wondering how anyone has gotten this library to work in its current state. This is what the function this exception is raised in looks like in the current npm package:

a.formatWeekNumber = function(e) {
                return a.props.formatWeekNumber ? a.props.formatWeekNumber(e) : function(t) {
                    return function(e, t, n) {
                        if (2 > arguments.length)
                            throw new TypeError("2 arguments required, but only " + arguments.length + " present");
                        var r = c(e, n)
                          , a = s(t);
                        r.setMonth(0),
                        r.setDate(a)
                    }(t, 1),
                    Se(function(e, t) {
                        if (1 > arguments.length)
                            throw new TypeError("1 argument required, but only " + arguments.length + " present");
                        var n = t || {}
                          , r = n.locale
                          , a = r && r.options && r.options.weekStartsOn
                          , o = null == a ? 0 : s(a)
                          , i = null == n.weekStartsOn ? o : s(n.weekStartsOn);
                        if (0 > i || i > 6)
                            throw new RangeError("weekStartsOn must be between 0 and 6 inclusively");
                        var u = c(e, n)
                          , l = u.getDay()
                          , p = 6 + (i > l ? -7 : 0) - (l - i);
                        return u.setDate(u.getDate() + p),
                        u.setHours(23, 59, 59, 999),
                        u
                    }(t), t) ? function(t, n, r) {
                        if (2 > arguments.length)
                            throw new TypeError("2 arguments required, but only " + arguments.length + " present");
                        var a = e(t, r) // ** exception raised here **
                          , o = e(n, r)
                          , i = a.getTime() - u(a)
                          , s = o.getTime() - u(o);
                        return Math.round((i - s) / pt)
                    }(t, function(e, t) {
                        if (1 > arguments.length)
                            throw new TypeError("1 argument required, but only " + arguments.length + " present");
                        var n = c(e, t)
                          , r = new Date(0);
                        return r.setFullYear(n.getFullYear(), 0, 1),
                        r.setHours(0, 0, 0, 0),
                        r
                    }(t)) + 1 : 1
                }(e)
            }

I have marked the line where the exception is raised. e here seems to refer to the parameter of the function (called startOfWeek in the plaintext source).

This seems to be a part of an inlined function from date-fns, namely differenceInCalendarWeeks (Line 56). This line uses a function that has the same name as the parameter for formatWeekNumber. It would seem to be a bug where the minifier has conflated the two names, and replaced them with the same symbol.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.