metamask-extension/ui/app/helpers/constants/error-keys.js

export const INSUFFICIENT_FUNDS_ERROR_KEY = 'insufficientFunds';
export const GAS_LIMIT_TOO_LOW_ERROR_KEY = 'gasLimitTooLow';
export const TRANSACTION_ERROR_KEY = 'transactionError';
export const TRANSACTION_NO_CONTRACT_ERROR_KEY = 'transactionErrorNoContract';
export const ETH_GAS_PRICE_FETCH_WARNING_KEY = 'ethGasPriceFetchWarning';
export const GAS_PRICE_FETCH_FAILURE_ERROR_KEY = 'gasPriceFetchFailed';
export const GAS_PRICE_EXCESSIVE_ERROR_KEY = 'gasPriceExcessive';