feat: implement auto-generated composables based on module config

Author: mateuszkulpa

Diff for: package.json

@@ -39,7 +39,8 @@
     "docs:dev": "nuxi dev docs"
   },
   "dependencies": {
-    "@nuxt/kit": "^3.10.3"
+    "@nuxt/kit": "^3.10.3",
+    "scule": "^1.3.0"
   },
   "devDependencies": {
     "@nuxt/devtools": "latest",

Diff for: pnpm-lock.yaml

@@ -1,4 +1,13 @@
-import { addComponentsDir, addImportsDir, createResolver, defineNuxtModule } from '@nuxt/kit'
+import {
+  addComponentsDir,
+  addImports,
+  addImportsDir,
+  addTemplate,
+  createResolver,
+  defineNuxtModule,
+} from '@nuxt/kit'
+import type { ABTest } from './runtime/types'
+import { pascalCase } from 'scule'
 
 export interface ModuleOptions {
   /**
@@ -8,6 +17,13 @@ export interface ModuleOptions {
    * @default true
    */
   persistVariants: boolean
+  /**
+   * List of A/B tests.
+   * This will be used to automatically generate components and composables
+   *
+   * @default []
+   */
+  tests: ABTest[]
 }
 
 export default defineNuxtModule<ModuleOptions>({
@@ -20,6 +36,7 @@ export default defineNuxtModule<ModuleOptions>({
   },
   defaults: {
     persistVariants: true,
+    tests: [],
   },
   async setup(options, nuxt) {
     const resolver = createResolver(import.meta.url)
@@ -30,6 +47,23 @@ export default defineNuxtModule<ModuleOptions>({
 
     addImportsDir(resolver.resolve('./runtime/composables'))
 
+    const composables: string[] = []
+    for (const test of options.tests) {
+      const composableName = `use${pascalCase(test.id)}ABTest`
+      addImports({
+        from: '#build/ab-test-composables',
+        name: composableName,
+      })
+      composables.push(`export function ${composableName}() {
+  return useABTest(${JSON.stringify(test)});
+}`)
+    }
+    addTemplate({
+      filename: `./ab-test-composables.ts`,
+      write: true,
+      getContents: () => composables.join('\n\n'),
+    })
+
     nuxt.options.runtimeConfig.public.abTesting = {
       persistVariants: options.persistVariants,
     }

Diff for: src/module.ts

@@ -19,7 +19,7 @@ export interface Variant<TVariantValue extends JSONValue> {
   weight?: number
 }
 
-export interface ABTest<TVariantValue extends JSONValue> {
+export interface ABTest<TVariantValue extends JSONValue = JSONValue> {
   id: string
   variants: Variant<TVariantValue>[]
 }