Implement json schema validation for configuration file

Some boiler plate code to get started.
Resource: https://ajv.js.org

// validate.js

import * as FileSystem from 'fs';
import YAML from 'yaml';
import Ajv from 'ajv';

const schema = process.argv[2];
const instance = process.argv[3];

const ajv = new Ajv();
const validate = ajv.compile(
  YAML.parse(
    FileSystem.readFileSync(schema, 'utf8'),
  ),
);

if (
  !validate(
    YAML.parse(
      FileSystem.readFileSync(instance, 'utf8'),
    ),
  )
) {
  for (let error of validate.errors) {
    console.log(error);
  }
  process.exitCode = 1;
};

node validate config-schema.yml appmap.yml

Start with the proposed validate.js entry point and review the AJV resource, config-schema.yml, and appmap.yml examples. Run the shown node validate config-schema.yml appmap.yml command to understand the expected input and error output. Done means configuration files are validated and invalid input produces actionable errors with a failing exit status.