Automatically make an Artblocks features.json file from features.js

generate-features-json.js

/** 1. Create a features.js script that has one method function calculateFeatures(tokenData) {...}. You will need this for Artblocks anywayz.
    2. Add this line to the bottom: export default calculateFeatures;
    3. Copy the contents of this gist into generate-features-json.js
    4. In your terminal, run node generate-features-json.js. 
    5. The script will take a minute to generate 2,000 outcomes and compile all of the different traits.
    6. Tada. features.json can be uploaded to Artblocks.
**/

import fs from 'fs';
import calculateFeatures from './features.js'
const featuresFilename = 'features.json';

console.log('Calculating features...');

let keys = null;
let res = []

const indexes = {};

for (let i = 0; i < 2_000; i++) {
    //random 64 char hex string.
    const hash = Math.random().toString(16).substr(2, 16)
    const features = calculateFeatures({ hash })

    if (!keys) {
        keys = Object.keys(features);
        keys.forEach((key) => {
            indexes[key] = res.length;
            res.push({ id: "", name: key, type: "enum", options: [] });

        });
    }

    keys.forEach(key => {
        if (!res[indexes[key]].options.includes(features[key])) {
            res[indexes[key]].options.push(features[key]);
        }
    });
}

res = res.map(feature => {
    if (feature.options.includes(true) && feature.options.includes(false)) {
        feature.type = "boolean";
    }
    return feature;
});

//Save as JSON file
fs.writeFileSync(featuresFilename, JSON.stringify(res, null, 2));
console.log(`Saved as ${featuresFilename}.`)