Little script to download WordPress images.

wp-mid.js

class MultiImageDownloader {
    constructor(images) {
        this.images = images ?? [];
        this.downloaded = [];
        this.index = 0;
    }

    downloadFile(url, filename) {
        // https://stackoverflow.com/a/45905238/10887412
        fetch(url)
            .then(response => response.blob())
            .then(blob => {
                const link = document.createElement("a");
                link.href = URL.createObjectURL(blob);
                link.download = filename;
                link.click();
            })
            .catch(console.error);
    }

    fetch(selector) {
        const children = document.querySelectorAll(selector);
        for (const img in children) {
            if (!children[img].src) continue;

            this.images.push(children[img].src);
        }

        console.log('Fetched ' + this.images.length + ' images.');
    }

    next(index = -1) {
        if (index > -1) {
            this.setIndex(index);
        }

        if (this.index >= this.images.length) {
            console.log('Downloaded ' + this.index + ' of ' + this.images.length + ' images. Done!');
            return;
        }

        this.downloadFile(
            this.images[this.index].replace(/-\d{3}x\d{3}/s, ''), 
            this.images[this.index].split('/').pop().replace(/-\d{3}x\d{3}/s, '')
        );

        this.downloaded.push(this.images[this.index]);

        this.index++;

        console.log('Downloaded ' + this.index + ' of ' + this.images.length + ' images.');

        if (this.index < this.images.length) {
            console.log('Next image: ' + this.images[this.index]);
        }
    }

    setIndex(index) {
        console.log('Changed index to ' + index + ' from ' + this.index);
        this.index = index;
    }

    downloadAll() {
        console.log('Downloading all images... Starting at index ' + this.index + '...');
        
        for (let i = this.index; i < this.images.length; i++) {
            this.next(i);
        }

        if (this.downloaded.length === this.images.length) {
            console.log('Downloaded all images.');
        }
    }
}