Javascript runtime for Stucco
About
Stucco-js is JavaScript/TypeScript runtime for Stucco. It can be used as a local development environment or as a base library for implementing FaaS runtime.
Configuration file
Stucco-js relies on Stucco library written in GoLang. Configuration file format is in JSON.
Resolvers
{
"resolvers":{
"RESOLVER_TYPE.RESOLVER_FIELD":{
"resolve":{
"name": "PATH_TO_RESOLVER"
}
}
}
}Custom Scalars
{
"scalars":{
"CUSTOM_SCALAR_NAME":{
"parse":{
"name": "PATH_TO_RESOLVER"
},
"serialize":{
"name": "PATH_TO_RESOLVER"
}
}
}
}Handler
You can also return Promise from handler
Default export
module.exports = (input) => {
return "Hello world"
}Handler export
module.exports.handler = (input) => {
return "Hello world"
}Named export
module.exports.someName = (input) => {
return "Hello world"
}{
"resolvers":{
"RESOLVER_TYPE.RESOLVER_FIELD":{
"resolve":{
"name": "PATH_TO_RESOLVER.someName"
}
}
}
}Passing arguments to another resolver
Resolver "Query.todoOperations"
type TodoOperations{
getCreditCardNumber(id: String!): String
showMeTehMoney: Int
}
type Query{
todoOps: TodoOperations
}{
"resolvers":{
"Query.todoOps":{
"resolve":{
"name": "lib/todoOps"
}
},
"TopoOps.getCreditCardNumber":{
"resolve":{
"name": "lib/getCreditCardNumber"
}
}
}
}lib/todoOps.js
module.exports = (input) => {
return {
response:{
creditCards:{
dupa: "1234-1234-1234-1234",
ddd: "1222-3332-3323-1233"
}
}
}
}lib/getCreditCardNumber.js
module.exports = (input) => {
const { id } = input.arguments
return {
response: input.source.creditCards[id]
}
}Example
Basic
schema.graphql
type Query{
hello: String
}
schema{
query: Query
}stucco.json
{
"resolvers":{
"Query.hello":{
"resolve":{
"name": "lib/hello"
}
}
}
}lib/hello.js
export function handler(input){
return "Hello world"
}Test query
{
hello
}{
"hello": "Hello world"
}This JSON defines resolver
Using TypeScript
So if you have your TypeScript files in src folder you should transpile them to the lib folder and stucco can run it from there.
Local development
To start local development you need stucco.json, schema.graphql, file with resolvers in the root folder and inside root folder. To fetch your schema from URL you can use tool like graphql-zeus
Add this script to your package json to test your backend
{
"scripts":{
"start": "stucco"
}
}Or run with npx
npx stucco