TypeError: Cannot read property 'match' of undefined

[nam-hle]

Hi all, I'm suffering an issue while trying to show validate a JSON file. The below are my model, schema, and script files.

Here is my TS interface file (model.ts)

export interface Model {
	readonly defaultRowAction?: DefaultRowAction;
}

export interface DefaultRowAction {
	readonly custom: boolean;
	readonly event: string;
}

The schema is generated by ts-json-schema-generator package (schema.json)

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$ref": "#/definitions/Model",
  "definitions": {
    "Model": {
      "type": "object",
      "properties": {
        "defaultRowAction": {
          "$ref": "#/definitions/DefaultRowAction"
        }
      },
      "additionalProperties": false
    },
    "DefaultRowAction": {
      "type": "object",
      "properties": {
        "custom": {
          "type": "boolean"
        },
        "event": {
          "type": "string"
        }
      },
      "required": [
        "custom",
        "event"
      ],
      "additionalProperties": false
    }
  }
}

My testing JSON file (model.json):

{
  "defaultRowAction" : {
    "custom" : false
  }
}

The scripting (index.js):

const Ajv = require("ajv");
const betterAjvErrors = require("better-ajv-errors");

const model = require("./model.json");
const schema = require("./schema.json");

const isValid = new Ajv().compile(schema);
if (!isValid(model)) {
	console.log(betterAjvErrors(schema, model, isValid.errors));
}

The output errors:

node index.js
PATH/node_modules/better-ajv-errors/lib/modern/helpers.js:26
    const paths = dataPath === '' ? [''] : dataPath.match(JSON_POINTERS_REGEX);
                                                    ^

TypeError: Cannot read property 'match' of undefined
    at PATH/node_modules/better-ajv-errors/lib/modern/helpers.js:26:53
    at Array.forEach (<anonymous>)
    at makeTree (PATH/node_modules/better-ajv-errors/lib/modern/helpers.js:21:13)
    at _default (PATH/node_modules/better-ajv-errors/lib/modern/helpers.js:116:16)
    at _default (PATH/node_modules/better-ajv-errors/lib/modern/index.js:27:45)
    at Object.<anonymous> (PATH/scripts/index.js:9:14)
    at Module._compile (internal/modules/cjs/loader.js:1068:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1097:10)
    at Module.load (internal/modules/cjs/loader.js:933:32)
    at Function.Module._load (internal/modules/cjs/loader.js:774:14)

The environment and package versions:

MacOS darwin x86_64
Node: 14.17.0
Npm: 6.14.13
ajv: 8.6.2
better-ajv-errors: 0.7.0
ts-json-schema-generator: 0.95.0

[henrikrudstrom]

I got the same error:
this is my schema:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://example.com/product.schema.json",
  "title": "ordino engine-config",
  "description": "flette config for ordino",
  "type": "object",
  "definitions": {
    "mixers": {
      "fixed-positions": {
        "type": "object",
        "properties": {
          "name": { "type": "string", "const": "fixed-positions" },
          "positions": {
            "type": "object",
            "additionalProperties": {
              "type": "array",
              "items": { "type": "number" }
            }
          },
          "pin": {
            "type": "array",
            "items": { "type": "string" }
          }
        },
        "additionalProperties": false,
        "required": ["name"]
      },
      "weighed-sort": {
        "type": "object",
        "properties": {
          "name": { "type": "string", "const": "weighted-sort" }
        },
        "additionalProperties": false,
        "required": ["name"]
      }
    },
    "postprocessors": {
      "sort-by-score": {
        "type": "object",
        "properties": {
          "name": { "type": "string", "const": "sort-by-score" },
          "additionalProperties": false,
          "required": ["name"]
        }
      },
      "assign-score": {
        "type": "object",
        "properties": {
          "name": { "type": "string", "const": "assign-score" },
          "fixed": {
            "type": "object",
            "properties": { "value": { "type": "number" } },
            "additionalProperties": false,
            "required": ["value"]
          },
          "linear": {
            "type": "object",
            "properties": {
              "min": { "type": "number" },
              "max": { "type": "number" }
            },
            "additionalProperties": false,
            "required": ["min", "max"]
          },
          "geometric": {
            "type": "object",
            "properties": {
              "max": { "type": "number" },
              "ratio": { "type": "number" }
            },
            "additionalProperties": false,
            "required": ["ratio", "max"]
          }
        },
        "oneOf": [
          { "required": ["name", "fixed"] },
          { "required": ["name", "linear"] },
          { "required": ["name", "geometric"] }
        ]
      }
    },
    "source": {
      "type": "object",
      "properties": {
        "type": { "type": "string", "const": "source" },
        "name": { "type": "string" },
        "source": { "type": "string" },
        "usePreferences": { "type": "boolean" },
        "weight": { "type": "number" },
        "postProcess": {
          "oneOf": [
            { "$ref": "#/definitions/postprocessors/sort-by-score" },
            { "$ref": "#/definitions/postprocessors/assign-score" }
          ]
        },
        "teasers": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "id": { "type": "string" },
              "frontpageID": { "type": "string" },
              "siteKey": { "type": "string" },
              "source": { "type": "string" },
              "score": { "type": "number" }
            },
            "additionalProperties": false,
            "required": ["id"]
          }
        }
      },
      "additionalProperties": false,
      "oneOf": [
        { "required": ["type", "name", "source"] },
        { "required": ["type", "name", "teasers"] }
      ]
    },
    "composition": {
      "type": "object",
      "properties": {
        "type": { "type": "string", "const": "composition" },
        "name": { "type": "string" },
        "mixer": {
          "oneOf": [
            { "$ref": "#/definitions/mixers/fixed-positions" },
            { "$ref": "#/definitions/mixers/weighed-sort" }
          ]
        },
        "postProcess": {
          "oneOf": [
            { "$ref": "#/definitions/postprocessors/sort-by-score" },
            { "$ref": "#/definitions/postprocessors/assign-score" }
          ]
        },
        "weight": { "type": "number" },
        "sources": {
          "type": "array",
          "items": {
            "oneOf": [
              { "$ref": "#/definitions/source" },
              { "$ref": "#/definitions/composition" }
            ]
          }
        }
      },
      "additionalProperties": false,
      "required": ["name", "mixer", "sources"]
    }
  },
  "oneOf": [
    { "$ref": "#/definitions/source" },
    { "$ref": "#/definitions/composition" }
  ]
}

data is

{
  "type": "composition",
  "name": "root",
  "mixer": { "name": "weighted-sort" },
  "sources": [
    {
      "type": "source",
      "name": "frontpage",
      "postProcess": {
        "name": "assig-score",
        "linear": {
          "min": 0.1,
          "max": 1.0
        }
      },
      "source": "frontpage",
      "usePreferences": true
    }
  ]
}

[janstuemmel]

probably and issue with version 7/8 of ajv. They removed the option jsonPointer: boolean and better-ajv relies on that i think. Try downgrading ajv to version 6

[torifat]

This should be fixed by #92