Runtime.ImportModuleError: Error: Cannot find module 'lambda'

[Strydom]

Running serverless offline works fine, but then when i try and hit a URL for my express app it fails with the bellow error.
Anyone know if I've missed something or if something is not compatible?

I'm using

• Typescript with ESNext
• serverless-http (to turn express app into a lambda)
• serverless-webpack
• serverless-offline

Could it be something to do with the way ESNext modules are exported not being supported by serverless-offline?

"Runtime.ImportModuleError: Error: Cannot find module 'lambda'",
"Require stack:",
"- /Users/chstrydom/Documents/GitHub/ssr-travel-planner/node_modules/.pnpm/serverless-offline@12.0.4_serverless@3.30.1_typescript@4.9.5/node_modules/serverless-offline/src/lambda/handler-runner/in-process-runner/aws-lambda-ric/UserFunction.js",
"at _loadUserApp (/Users/chstrydom/Documents/GitHub/ssr-travel-planner/node_modules/.pnpm/serverless-offline@12.0.4_serverless@3.30.1_typescript@4.9.5/node_modules/serverless-offline/src/lambda/handler-runner/in-process-runner/aws-lambda-ric/UserFunction.js:310:15)",
"at async module.exports.load (/Users/chstrydom/Documents/GitHub/ssr-travel-planner/node_modules/.pnpm/serverless-offline@12.0.4_serverless@3.30.1_typescript@4.9.5/node_modules/serverless-offline/src/lambda/handler-runner/in-process-runner/aws-lambda-ric/UserFunction.js:341:21)",
"at async InProcessRunner.run (file:///Users/chstrydom/Documents/GitHub/ssr-travel-planner/node_modules/.pnpm/serverless-offline@12.0.4_serverless@3.30.1_typescript@4.9.5/node_modules/serverless-offline/src/lambda/handler-runner/in-process-runner/InProcessRunner.js:41:21)"

serverless.yml

service: my-app-api
frameworkVersion: '3'

plugins:
  - serverless-webpack
  - serverless-offline

custom:
  webpack:
    webpackConfig: 'webpack.config.cjs'
    includeModules: true

provider:
  name: aws
  runtime: nodejs18.x
  memorySize: 512 # mb
  timeout: 10 # seconds
  versionFunctions: false

functions:
  api:
    handler: src/lambda.handler
    events:
      - httpApi: '*'

directory

apps/api/src/lambda.ts
apps/api/package.json
apps/api/serverless.yml
apps/api/tsconfig.json
apps/api/webpack.config.cjs

lambda.ts

import serverless from "serverless-http";
import { app } from "./app";

export const handler = serverless(app)

webpack.config.cjs

module.exports = {
  mode: slsw.lib.webpack.isLocal ? 'development' : 'production',
  devtool: slsw.lib.webpack.isLocal ? 'source-map' : 'cheap-source-map',
  entry: slsw.lib.entries,
  target: 'node',
  externalsPresets: { node: true },
  resolve: {
    extensions: ['.ts', '.js', '.json'],
  },
  experiments: {
    topLevelAwait: true,
    outputModule: true
  },
  module: {
    rules: [
      {
        test: /\.ts?$/,
        use: 'ts-loader',
        exclude: [
          /node_modules/,
          /.serverless/,
          /.webpack/
        ],
      },
    ],
  },
  output: {
    filename: 'lambda.js',
    path: path.resolve(__dirname, 'dist'),
    library: {
      type: 'module',
    },
    chunkFormat: 'module',
  },
  externals: ['aws-sdk', nodeExternals()],
  optimization: {
    minimize: true,
    minimizer: [
      new JsonMinimizerPlugin(),
    ],
  },
  plugins: [
    new CopyPlugin({
      patterns: [
        { from: 'src/assets', to: 'assets' }
      ],
    }),
  ],
}

tsconfig.json

{
  "compilerOptions": {
    "lib": ["ESNext"],
    "module": "ESNext",
    "target": "ESNext",
    "moduleResolution": "Node",
    "esModuleInterop": true,
    "outDir": "dist",
    "baseUrl": ".",
    "strict": true,
    "noImplicitAny": true
  },
  "ts-node": {
    "esm": true,
    "experimentalSpecifierResolution": "node"
  },
  "include": [
    "src/**/*"
  ]
}

package.json

{
  "name": "api",
  "private": true,
  "type": "module",
  "exports": "./dist/lambda.js",
  "scripts": {
    "build": "webpack",
    "dev": "nodemon src/server.ts"
  },
  "dependencies": {
    "body-parser": "^1.20.2",
    "cors": "^2.8.5",
    "express": "^4.18.2",
    "iso-3166": "^4.2.0",
    "serverless-http": "^3.2.0",
    "shared": "workspace:*",
    "underscore": "^1.13.6"
  },
  "devDependencies": {
    "@types/body-parser": "^1.19.2",
    "@types/cors": "^2.8.13",
    "@types/express": "^4.17.17",
    "@types/node": "^18.16.5",
    "@types/underscore": "^1.11.4",
    "concurrently": "^8.0.1",
    "copy-webpack-plugin": "^11.0.0",
    "country-to-currency": "^1.0.8",
    "json-minimizer-webpack-plugin": "^4.0.0",
    "nodemon": "^2.0.22",
    "serverless": "^3.30.1",
    "serverless-offline": "^12.0.4",
    "serverless-webpack": "^5.11.0",
    "ts-loader": "^9.4.2",
    "ts-node": "^10.9.1",
    "typescript": "^4.9.5",
    "webpack": "^5.82.0",
    "webpack-cli": "^5.1.0",
    "webpack-node-externals": "^3.0.0"
  }
}

[dhantke]

Hey Strydom, I have a similar problem. Have you found a solution to this problem?

[juanpgranados]

I could solve it by installing serverless-esbuild plugin.