const glob = require('glob'); const fs = require('fs'); const regex = /^.*_.*$/gm; console.log( __dirname ); const declarations = glob.sync( './build/types/**/*.d.ts' ); console.log( declarations ); for ( const declarationFile of declarations ) { const rawContent = fs.readFileSync( declarationFile, 'utf-8' ); fs.writeFileSync( declarationFile, rawContent.replace(regex,'') ); }