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lambda-dev

λ-dev

Develop and Bundle Your Lambda Functions With Ease.

Installation

npm install --save-dev lambda-dev

yarn add --dev lambda-dev

Usage

Development

Use lambda-dev to develop lambda functions locally. lambda-dev serve starts an Express server that proxies http requests to your lambda functions. They are transpiled with @babel/core and @babel/preset-env, with the node target set to --node [target] (default 6.10). This is done through webpack with the help of babel-loader.

lambda-dev serve --help
lambda-dev serve src/functions --node 8.10 --port 9000 --basePath /lambda

Now a given function src/functions/test.js will be invoked with requests to http://localhost:9000/lambda/test.

Build

lambda-dev build --help
lambda-dev serve src/functions build/functions --node 8.10

Bundled functions will be at build/functions.

Custom Webpack configuration

It is possible to supply a custom Webpack configuration for serving and building your Lambda functions:

lambda-dev serve src/functions --webpack-config ./my-webpack.config.js

where the default export of my-webpack.config.js should be either and object or a function. If it's an object, it will be merged with the default configuration using merge.smart from webpack-merge. If it's a function, it will receive the default configuration as its argument and should return a full valid configuration.

Custom babel configuration

It's not possible to directly supply a custom babel configuration, but you can override the webpack configuration's babel-loader options:

const myBabelOptions = require('./my-babel.config.js');
 
module.exports = {
  module: {
    rules: [
      {
        test: /\.js$/,
        use: {
          loader: require.resolve('babel-loader'),
          options: {
            babelrc: false,
            options: myBabelOptions
          }
        }
      }
    ]
  }
};

Lambda Function Specification

Read the official docs

Lambda functions should export a handler function that receives the following arguments:

import { Request } from 'express';
 
type Event = {
  path: Request.path,
  httpMethod: Request.method,
  queryStringParameters: Request.query,
  headers: Request.headers,
  body: Request.body
};
 
type Context = {} // Empty with `lambda-dev serve`
 
exports.handler: (event: Event, context: Context, callback) => callback(error: Error | null, response: Response | null);