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const fs = require('fs');
const path = require('path');
const crypto = require('crypto');
const CACHE_PATHS = [
'./config/webpack.config.js',
'./config/webpack.vendor.config.js',
'./package.json',
'./yarn.lock',
];
const resolvePath = (file) => path.resolve(__dirname, '../..', file);
const readFile = (file) => fs.readFileSync(file);
const fileHash = (buffer) => crypto.createHash('md5').update(buffer).digest('hex');
module.exports = () => {
const fileBuffers = CACHE_PATHS.map(resolvePath).map(readFile);
return fileHash(Buffer.concat(fileBuffers)).substr(0, 12);
};
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