const chalk = require('chalk') const rules = [ { type: 'cant-resolve-loader', re: /Can't resolve '(.*loader)'/, msg: (e, match) => ( `Failed to resolve loader: ${chalk.yellow(match[1])}\n` + `You may need to install it.` ) } ] exports.transformer = error => { if (error.webpackError) { const message = typeof error.webpackError === 'string' ? error.webpackError : error.webpackError.message || '' for (const { re, msg, type } of rules) { const match = message.match(re) if (match) { return Object.assign({}, error, { // type is necessary to avoid being printed as defualt error // by friendly-error-webpack-plugin type, shortMessage: msg(error, match) }) } } // no match, unknown webpack error without a message. // friendly-error-webpack-plugin fails to handle this. if (!error.message) { return Object.assign({}, error, { type: 'unknown-webpack-error', shortMessage: message }) } } return error } exports.formatter = errors => { errors = errors.filter(e => e.shortMessage) if (errors.length) { return errors.map(e => e.shortMessage) } }