Wrote a script to validate user config against schema

src/utils/ConfigValidator.js

@@ -0,0 +1,58 @@
+const Ajv = require('ajv');
+const yaml = require('js-yaml');
+const fs = require('fs');
+
+const schema = require('./ConfigSchema');
+
+const validatorOptions = {
+  strict: true,
+  allowUnionTypes: true,
+  allErrors: true,
+};
+
+const ajv = new Ajv(validatorOptions);
+
+/* Message printed when validation was successful */
+const successMsg = () => {
+  return '\x1b[1m\x1b[32m\033[1mNo issues found, config is valid :)\x1b[0m\n';
+}
+
+/* Formats error message. ready for printing to the console */
+const errorMsg = (output) => {
+  const warningFont = '\033[1m\x1b[103m\x1b[34m';
+  const line = `${warningFont}${new Array(42).fill('━').join('')}\x1b[0m`;
+  let msg = `\n${line}\n${warningFont}  Warning: ${output.length} `
+    + `issue${output.length > 1 ? 's' : ''} found in config file  \x1b[0m\n${line}\n`;
+  output.forEach((details, index) => {
+    msg += `${'\033[1m\x1b[36m'}${index + 1}. ${details.keyword} ${details.message} `
+      + `in ${'\033[4m'}${details.instancePath}\x1b[0m\n`;
+  });
+  return msg;
+};
+
+/* Error message printed when the file could not be opened */
+const bigError = () => {
+  const formatting = '\033[31m\033[1m\033[47m';
+  const line = `${formatting}${new Array(41).fill('━').join('')}\x1b[0m\n`;
+  const msg = `${formatting} Error, unable to find / open 'conf.yml' \x1b[0m\n`;
+  return `${line}${msg}${line}\n`;
+}
+
+/* Start the validation */
+const validate = (config, schema) => {
+  console.log('\nChecking config file against schema...');
+  const valid = ajv.validate(schema, config);
+  if (valid) {
+    console.log(successMsg());
+  } else {
+    console.log(errorMsg(ajv.errors));
+  }
+}
+
+try {
+  const config = yaml.safeLoad(fs.readFileSync('./public/conf.yml', 'utf8'));
+  validate(config, schema);
+} catch (e) {
+  console.log(bigError(), e);
+}
+