Error when validating with standalone/precompiled function

[lance]

I'd like to precompile my validation functions, and also use some custom formatters but am getting errors when doing so. I've created a project here to illustrate the issue: https://github.com/lance/ajv-test

My schema in schema/schema.json is simple. There is a single time field with a custom format of js-date-time. The format validation code is in schema/formats.js.

I generate the validation function with the command

ajv compile -c ./schema/formats.js -s ./schema/schema.json -o ./schema/validate.js

This can also be run via npm run build for convenience, outputting a nicely formatted JS file.

The code that uses this validation function is in app.js and simply attempts to validate an object with what should be a valid value. When I call validate(), however, I get an error.

TypeError: formats0 is not a function

If you look at the prettified JavaScript generated for the validation function, it's easy to see that, in fact, formats0 is not a function.

const formats0 = {
  _items: ['require("ajv-formats/dist/formats").', { str: "fullFormats" }, ""],
}["js-date-time"];

I'm not sure what I am doing wrong here. Any guidance is appreciated.

What version of Ajv are you using? Does the issue happen if you use the latest version?

8.8.2 - the latest as of this writing

Ajv options object

Called from the CLI with the following options

ajv compile -c ./schema/formats.js -s ./schema/schema.json

JSON Schema

{
  "$ref": "#/definitions/event",
  "definitions": {
    "event": {
      "properties": {
        "time": {
          "$ref": "#/definitions/time"
        }
      },
      "type": "object"
    },
    "time": {
      "format": "js-date-time",
      "type": "string"
    }
  },
  "type": "object"
}

Sample data

{ time: new Date().toString() }

Your code

Please see this simplified test project: https://github.com/lance/ajv-test

Validation result, data AFTER validation, error messages

> node app.js

/home/lanceball/src/github.com/lance/ajv-test/schema/validate.js:37
              if (!formats0(data0)) {
                   ^

TypeError: formats0 is not a function
    at validate21 (/home/lanceball/src/github.com/lance/ajv-test/schema/validate.js:37:20)
    at validate20 (/home/lanceball/src/github.com/lance/ajv-test/schema/validate.js:99:6)
    at Object.<anonymous> (/home/lanceball/src/github.com/lance/ajv-test/app.js:3:6)
    at Module._compile (node:internal/modules/cjs/loader:1101:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:79:12)
    at node:internal/main/run_main_module:17:47

What results did you expect?

Successful validation of the test object.

Are you going to resolve the issue?

If you tell me how! :)

[epoberezkin]

There are two ways it can be done with standalone code:

1. add you format definition to the object with all formats exported by ajv-formats.
2. Setting code.formats object to point to some other object with all formats definitions (after calling ajv-formats, as it sets it to point to itself).

Both approaches are a bit hacky, but it works.

[lance]

@epoberezkin thanks for the quick response! I'm sorry but I don't really understand either of the suggestions you are making. Can you possibly provide some kind of example code to illustrate this?

[lance]

@epoberezkin ping - bumping this up in your awareness after the holidays and the new year. Any assistance you can provide would be much appreciated. Thanks!

[marcbachmann]

What @epoberezkin meant is that you just set the format before loading the custom compile function:

require('ajv-formats/dist/formats')['js-date-time'] = {validate, compile}