feat: Add webpack-plugin option validation (#32)

packages/treat/webpack-plugin/TreatError.js

@@ -1,7 +1,9 @@
 module.exports = class TreatError extends Error {
   constructor(error) {
     super(
-      `treat-plugin: An error occured during compilation: \n${error.stack}`,
+      `treat-webpack-plugin: An error occured during compilation: \n${
+        error.stack
+      }`,
     );
 
     this.name = 'TreatError';

packages/treat/webpack-plugin/optionValidator.js

@@ -0,0 +1,32 @@
+const joi = require('@hapi/joi');
+
+const schema = joi.object({
+  test: joi.any(),
+  outputCSS: joi.boolean(),
+  outputLoaders: joi.array().items(joi.any()),
+  localIdentName: joi.string(),
+  themeIdentName: [joi.func(), joi.string()],
+  minify: joi.boolean(),
+  browsers: [joi.string(), joi.array().items(joi.string())],
+  verbose: joi.boolean(),
+});
+
+class ValidationError extends Error {
+  constructor(error) {
+    super();
+
+    this.name = 'treat-webpack-plugin: Invalid options passed to treat plugin';
+
+    this.message = `\n${error.annotate()}\n`;
+
+    Error.captureStackTrace(this, this.constructor);
+  }
+}
+
+module.exports = options => {
+  const { error } = schema.validate(options);
+
+  if (error !== null) {
+    throw new ValidationError(error);
+  }
+};

packages/treat/webpack-plugin/plugin.js

@@ -6,6 +6,7 @@ const store = require('./store');
 const reIndexModules = require('./reIndexModules');
 const TreatError = require('./TreatError');
 const makeTreatCompiler = require('./treatCompiler');
+const optionValidator = require('./optionValidator');
 const { debugIdent } = require('./utils');
 
 const isProductionLikeMode = options => {
@@ -28,6 +29,8 @@ const trace = (...params) => {
 
 module.exports = class TreatWebpackPlugin {
   constructor(options = {}) {
+    optionValidator(options);
+
     const {
       test = /\.treat.(js|ts)$/,
       outputCSS = true,