function.ast.json

"type": "Program",
    "body": [
        {
            "type": "FunctionDeclaration",
            "id": {
                "type": "Identifier",
                "name": "f"
            },
            "params": [
                {
                    "type": "Identifier",
                    "name": "a"
                },
                {
                    "type": "Identifier",
                    "name": "b"
                }
            ],
            "defaults": [],
            "body": {
                "type": "BlockStatement",
                "body": [
                    {
                        "type": "ReturnStatement",
                        "argument": {
                            "type": "ObjectExpression",
                            "properties": [
                                {
                                    "type": "Property",
                                    "key": {
                                        "type": "Identifier",
                                        "name": "specField"
                                    },
                                    "computed": false,
                                    "value": {
                                        "type": "ObjectExpression",
                                        "properties": [
                                            {
                                                "type": "Property",
                                                "key": {
                                                    "type": "Identifier",
                                                    "name": "one"
                                                },
                                                "computed": false,
                                                "value": {
                                                    "type": "Literal",
                                                    "value": 1,
                                                    "raw": "1"
                                                },
                                                "kind": "init",
                                                "method": false,
                                                "shorthand": false
                                            }
                                        ]
                                    },
                                    "kind": "init",
                                    "method": false,
                                    "shorthand": false
                                }
                            ]
                        }
                    }
                ]
            },
            "generator": false,
            "expression": false
        }
    ],
    "sourceType": "script"

function f(a, b){
    return {
        specField: {
            one: 1
        }
    }
}