zkapp-cli/templates/project-ts/scripts/generate-cache.ts

CLI to create zkApps (zero-knowledge apps) for Mina Protocol

import { Cache } from 'o1js';
import fs from 'fs/promises';

// @ts-expect-error - These imports will resolve in the generated project after the contract is built. Remove these comments in your project.
const { Add } = await import('../build/src/Add.js');
// @ts-expect-error - These imports will resolve in the generated project after the ZkProgram is built. Remove these comments in your project.
const { AddZkProgram } = await import('../build/src/AddZkProgram.js');

const cache_directory = 'cache';

// Create a file system cache instance pointing to our cache directory
// This allows o1js to store and retrieve compiled circuit artifacts
const cache: Cache = Cache.FileSystem(cache_directory);

// ZkProgram cache in the browser is currently not fully supported.
await AddZkProgram.compile();
// Compile the smart contract with the cache enabled
await Add.compile({ cache });

type CacheList = {
  files: string[];
};
const cacheObj: CacheList = {
  files: [],
};

const files = await fs.readdir(cache_directory);
for (const fileName of files) {
  if (!fileName.endsWith('.header')) {
    cacheObj['files'].push(fileName);
  }
}

const jsonCacheFile = `cache.json`;

try {
  await fs.writeFile(jsonCacheFile, JSON.stringify(cacheObj, null, 2));
  console.log('JSON cached object successfully saved ');
} catch (error) {
  console.error('Error writing JSON file:', error);
}