I am trying to make a calendar array in Node.js. this is my main.mts:

import dayjs from 'dayjs';
import customParseFormat from 'dayjs/plugin/customParseFormat';

dayjs.extend(customParseFormat);

function nextDay(d: string) {
    const e = dayjs(d, 'MMM D, YYYY (ddd)');
    const f = dayjs(e).add(1, 'day');
    return dayjs(f).format('MMM D, YYYY (ddd)');
}

export class CalendarEdit {
    private cal: string[] = [];
    constructor(d: string) {
        this.cal.push(d);
        this.init(365).catch(err => { throw err; });
    }

    public addDate() {
        const d = this.cal[this.cal.length - 1];
        const e = nextDay(d);
        this.cal.push(e);
    }

    private init(j: number) {
        this.addDate();
        if (j > 1)
            this.init(j - 1);
    }

    public printCal() {
        console.log(this.cal);
    }
}

but result says every element in cal array is same, which has to be last day of calendar.
I know that JavaScript is basically non-blocking language, but I cannot find a way.
I tried callbacks and promises, and async, await pairs. but none of them worked.

I googled it but I cannot find a solution does work on my case. anyone knows the answer?

EDIT: I call CalendarEdit in my index.mts like this:

import { CalendarEdit } from './main';

let cal = new CalendarEdit('Jun 1, 2022 (Wed)');
cal.printCal();