Single schema 🤔

event.json

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "$id": "http://example.com/root.json",
    "type": "object",
    "title": "The Root Schema",
    "properties": {
        "trigger": {
            "oneOf": [
                {
                    "$ref": "#/definitions/tapTrigger"
                },
                {
                    "$ref": "#/definitions/swipeTrigger"
                }
            ]
        }
    },
    "definitions": {
        "tapTrigger": {
            "type": "object",
            "additionalProperties": false,
            "required": [
                "type",
                "coords"
            ],
            "properties": {
                "type": {
                    "type": "string",
                    "enum": [
                        "tap"
                    ]
                },
                "coords": {
                    "type": "array"
                }
            }
        },
        "swipeTrigger": {
            "type": "object",
            "additionalProperties": false,
            "required": [
                "type",
                "startCoords",
                "endCoords"
            ],
            "properties": {
                "type": {
                    "type": "string",
                    "enum": [
                        "swipe"
                    ]
                },
                "startCoords": {
                    "type": "array"
                },
                "endCoords": {
                    "type": "array"
                }
            }
        }
    }
}