JSON Format

Compositions are encoded as JSON dictionaries prior to deployment. For instance the composition in demo.js is encoded as:

{
    "type": "if",
    "test": {
        "type": "action",
        "name": "/_/authenticate",
        "action": {
            "exec": {
                "kind": "nodejs:default",
                "code": "const main = function ({ password }) { return { value: password === 'abc123' } }"
            }
        }
    },
    "consequent": {
        "type": "action",
        "name": "/_/success",
        "action": {
            "exec": {
                "kind": "nodejs:default",
                "code": "const main = function () { return { message: 'success' } }"
            }
        }
    },
    "alternate": {
        "type": "action",
        "name": "/_/failure",
        "action": {
            "exec": {
                "kind": "nodejs:default",
                "code": "const main = function () { return { message: 'failure' } }"
            }
        }
    }
}

This json dictionary has one mandatory field named type with the name of the combinator and possible other fields that depend on the specific combinator. The values of some of these fields may be themselves composition dictionaries. In this example, the test, consequent, and alternate fields are compositions of type action.

The field names and types typically match the combinator method signatures:

Type	Fields
action	name:string, action:optional object
function	function:object
literal or value	value:json value
empty
sequence or seq	components:array of compositions
let	declarations:object, components:array of compositions
mask	components:array of compositions
if and if_nosave	test:composition, consequent:composition, alternate:composition
while and while_nosave	test:composition, body:composition
dowhile and dowhile_nosave	body:composition, test:composition
repeat	count:number, components:array of compositions
try	body:composition, handler:composition
finally	body:composition, finalizer:composition
retry	count:number, components:array of compositions
retain and retain_catch	components:array of compositions
async	body:composition