A tool for locally testing now lambdas.

Install the tool via

> npm install -g now-lambda-runner

Let's say that we have the following now.json file:

{
  "version": 2,
  "builds": [
    { "src": "static/assets/**/*.*", "use": "@now/static" },
    { "src": "static/assets/*.*", "use": "@now/static" },
    { "src": "static/*.*", "use": "@now/static" },
    { "src": "api/*.js", "use": "@now/node" },
    { "src": "*.js", "use": "@now/node" },
    { "src": "*.html", "use": "@now/static" }
  ],
  "routes": [
    { "src": "/api/login", "dest": "/api/login.js" },
    { "src": "/api/demo", "dest": "/api/demo.js" },
    { "src": "/static/assets/(.*)", "dest": "/static/assets/$1"},
    { "src": "/static/(.*)", "dest": "/static/$1"},
    { "src": "/e/resources/(?<resource>[^/]*)", "dest": "/static/resources/$resource"},
    { "src": "/e/(.*)?", "dest": "/editor.js?id=$1"},
    { "src": "/docs", "dest": "/docs.html"},
    { "src": "/(.*)", "dest": "/index.html"}
  ]
}

We have to go to the folder containing that now.json file and run

> now-lambda

The result is as follows:

-----------------------------------
Routes:
  http://localhost:8004/api/login
  http://localhost:8004/api/demo
  http://localhost:8004/static/assets/(.*)
  http://localhost:8004/static/(.*)
  http://localhost:8004/e/resources/(?<resource>[^/]*)
  http://localhost:8004/e/(.*)?
  http://localhost:8004/docs
  http://localhost:8004/(.*)
-----------------------------------

And if we run the following curl request:

curl -i http://localhost:8004/e/foobar

we get editor.js lambda executed. The server reports:

=> /e/foobar === /e/(.*)?
   @now/node("/editor.js?id=foobar")

Here's is a list of the things that happen when now-lambda process your now.json file:

• It spins up a node server locally on your machine
• It starts reading the routes field in the now.json file and defines route handlers for each of the routes.
• When a route matches it reads the builds field to figure out if it has to server statically the file or it must run the lambda.
• The module only understands @now/static, @now/node and @now/static-build (partly). If there is another builder used the file is considered a static resource and it gets served directly.

now-lambda does not:

• Use the real now builders
• Does not connect to now's servers

• --config - path to now.json file
• --port - by default the local server listens on port 8004. You can change it via this argument.