webpack.config.js
の内容間違い。
既に動いている内容に書き換えて解決。
const path = require('path'); const slsw = require('serverless-webpack'); module.exports = { entry: slsw.lib.entries, output: { libraryTarget: 'commonjs', filename: '[name].js', path: path.join(__dirname, '.webpack'), }, mode: 'development', target: 'node', module: { rules: [ { test: /\.js$/, // include .js files enforce: 'pre', // preload the jshint loader exclude: /node_modules/, // exclude any and all files in the node_modules folder include: __dirname, use: [ { loader: 'babel-loader', options: { presets: [ [ '@babel/preset-env', { targets: { node: 'current', }, }, ], ], }, }, ], }, ], }, };