Improve serveless-webpack compatibility

README.md

@@ -102,6 +102,10 @@ This plugin currently supports the following AWS runtimes:
 * python3.6
 * python3.7
 
+### Using with serverless-webpack
+
+When using with [serverless-webpack](https://github.com/serverless-heaven/serverless-webpack) it is highly recommended to use the `nodejs10.x` runtime as this runtime does not require a helper script. For earlier Node.js runtimes a helper script is required which must be included via your `webpack.config.js`. The `serveless-iopipe-layers` plugin must follow the `serverless-webpack` plugin in your `serverless.yml`. See [here](https://github.com/iopipe/serverless-iopipe-layers/tree/master/examples/serverless-webpack) for an example.
+
 ## Limitations
 
 * Doesn't currently support local invocation

examples/serverless-webpack/package.json

@@ -0,0 +1,21 @@
+{
+  "name": "iopipe-layers-plugin-webpack-example",
+  "version": "0.0.0-test",
+  "description": "",
+  "main": "handler.js",
+  "scripts": {
+    "build": "yarn clean && yarn buildPlugin && yarn buildPackage",
+    "buildPackage": "LOCAL_PLUGIN=true SLS_DEBUG=* IOPIPE_TOKEN='test-token' sls package",
+    "buildPlugin": "cd ../../ && yarn build && mkdir -p examples/serverless-webpack/.serverless_plugins && cp -rf dist examples/serverless-webpack/.serverless_plugins/serverless-iopipe-layers",
+    "clean": "rm -rf .serverless_plugins",
+    "deploy": "yarn build && sls deploy"
+  },
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "serverless": "^1.38.0",
+    "serverless-webpack": "^5.3.1",
+    "webpack": "^4.35.2"
+  },
+  "dependencies": {}
+}

examples/serverless-webpack/serverless.yml

@@ -0,0 +1,20 @@
+service: iopipe-layers-plugins-webpack-example
+
+provider:
+  name: aws
+  stage: prod
+  region: us-east-1
+  runtime: nodejs10.x
+
+plugins:
+  - serverless-webpack
+  - serverless-iopipe-layers
+
+custom:
+    iopipe:
+        debug: true
+        token: ${env:IOPIPE_TOKEN}
+
+functions:
+  handler:
+    handler: handler.handler

examples/serverless-webpack/webpack.config.js

@@ -0,0 +1,6 @@
+const slsw = require('serverless-webpack');
+
+module.exports = {
+  entry: slsw.lib.entries,
+  target: 'node'
+};