remix-project/remix-solidity/src/compiler/compiler-input.js

'use strict'

module.exports = (sources, opts) => {
  return JSON.stringify({
    language: 'Solidity',
    sources: sources,
    settings: {
      optimizer: {
        enabled: opts.optimize === true || opts.optimize === 1,
        runs: 200
      },
      libraries: opts.libraries,
      outputSelection: {
        '*': {
          '': [ 'legacyAST' ],
          '*': [ 'abi', 'metadata', 'devdoc', 'userdoc', 'evm.legacyAssembly', 'evm.bytecode', 'evm.deployedBytecode', 'evm.methodIdentifiers', 'evm.gasEstimates' ]
        }
      }
    }
  })
}