feat: add addVitePlugin method

Author: Julien-R44

src/code_transformer/main.ts

@@ -158,6 +158,54 @@ export class CodeTransformer {
     }
   }
 
+  /**
+   * Add the given import declarations to the source file
+   * and merge named imports with the existing import
+   */
+  #addImportDeclarations(
+    file: SourceFile,
+    importDeclarations: { isNamed: boolean; module: string; identifier: string }[]
+  ) {
+    const existingImports = file.getImportDeclarations()
+
+    importDeclarations.forEach((importDeclaration) => {
+      const existingImport = existingImports.find(
+        (mod) => mod.getModuleSpecifierValue() === importDeclaration.module
+      )
+
+      /**
+       * Add a new named import to existing import for the
+       * same module
+       */
+      if (existingImport && importDeclaration.isNamed) {
+        if (
+          !existingImport
+            .getNamedImports()
+            .find((namedImport) => namedImport.getName() === importDeclaration.identifier)
+        ) {
+          existingImport.addNamedImport(importDeclaration.identifier)
+        }
+        return
+      }
+
+      /**
+       * Ignore default import when the same module is already imported.
+       * The chances are the existing default import and the importDeclaration
+       * identifiers are not the same. But we should not modify existing source
+       */
+      if (existingImport) {
+        return
+      }
+
+      file.addImportDeclaration({
+        ...(importDeclaration.isNamed
+          ? { namedImports: [importDeclaration.identifier] }
+          : { defaultImport: importDeclaration.identifier }),
+        moduleSpecifier: importDeclaration.module,
+      })
+    })
+  }
+
   /**
    * Write a leading comment
    */
@@ -297,46 +345,9 @@ export class CodeTransformer {
     const file = this.#project.getSourceFileOrThrow(testBootstrapUrl)
 
     /**
-     * Add the import declaration
+     * Add the import declarations
      */
-    const existingImports = file.getImportDeclarations()
-
-    importDeclarations.forEach((importDeclaration) => {
-      const existingImport = existingImports.find(
-        (mod) => mod.getModuleSpecifierValue() === importDeclaration.module
-      )
-
-      /**
-       * Add a new named import to existing import for the
-       * same module
-       */
-      if (existingImport && importDeclaration.isNamed) {
-        if (
-          !existingImport
-            .getNamedImports()
-            .find((namedImport) => namedImport.getName() === importDeclaration.identifier)
-        ) {
-          existingImport.addNamedImport(importDeclaration.identifier)
-        }
-        return
-      }
-
-      /**
-       * Ignore default import when the same module is already imported.
-       * The chances are the existing default import and the importDeclaration
-       * identifiers are not the same. But we should not modify existing source
-       */
-      if (existingImport) {
-        return
-      }
-
-      file.addImportDeclaration({
-        ...(importDeclaration.isNamed
-          ? { namedImports: [importDeclaration.identifier] }
-          : { defaultImport: importDeclaration.identifier }),
-        moduleSpecifier: importDeclaration.module,
-      })
-    })
+    this.#addImportDeclarations(file, importDeclarations)
 
     /**
      * Insert the plugin call in the `plugins` array
@@ -358,6 +369,57 @@ export class CodeTransformer {
     await file.save()
   }
 
+  /**
+   * Add a new Vite plugin
+   */
+  async addVitePlugin(
+    pluginCall: string,
+    importDeclarations: { isNamed: boolean; module: string; identifier: string }[]
+  ) {
+    /**
+     * Get the `vite.config.ts` source file
+     */
+    const viteConfigTsUrl = fileURLToPath(new URL('./vite.config.ts', this.#cwd))
+
+    const file = this.#project.getSourceFile(viteConfigTsUrl)
+    if (!file) {
+      throw new Error(
+        'Cannot find vite.config.ts file. Make sure to rename vite.config.js to vite.config.ts'
+      )
+    }
+
+    /**
+     * Add the import declarations
+     */
+    this.#addImportDeclarations(file, importDeclarations)
+
+    /**
+     * Get the default export options
+     */
+    const defaultExport = file.getDefaultExportSymbol()
+    if (!defaultExport) {
+      throw new Error('Cannot find the default export in vite.config.ts')
+    }
+
+    const options = defaultExport
+      .getDeclarations()[0]
+      .getChildrenOfKind(SyntaxKind.ObjectLiteralExpression)[0]
+
+    const pluginsArray = options
+      .getPropertyOrThrow('plugins')
+      .getFirstChildByKindOrThrow(SyntaxKind.ArrayLiteralExpression)
+
+    /**
+     * Add plugin call to the plugins array
+     */
+    if (!pluginsArray.getElements().find((element) => element.getText() === pluginCall)) {
+      pluginsArray.addElement(pluginCall)
+    }
+
+    file.formatText(this.#editorSettings)
+    await file.save()
+  }
+
   /**
    * Adds a policy to the list of `policies` object configured
    * inside the `app/policies/main.ts` file.

tests/code_transformer.spec.ts

@@ -779,3 +779,86 @@ test.group('Code transformer | addPolicies', (group) => {
     ])
   }).throws(/Expected to find an initializer of kind \'ObjectLiteralExpression\'./)
 })
+
+test.group('Code transformer | addVitePlugin', (group) => {
+  group.each.setup(async ({ context }) => setupFakeAdonisproject(context.fs))
+
+  test('add vite plugin to vite.config.ts file', async ({ assert, fs }) => {
+    await fs.create(
+      'vite.config.ts',
+      `export default {
+        plugins: [],
+      }`
+    )
+
+    const transformer = new CodeTransformer(fs.baseUrl)
+
+    await transformer.addVitePlugin('vue({ foo: 32 })', [
+      { identifier: 'vue', module: 'vue', isNamed: false },
+      { identifier: 'foo', module: 'foo', isNamed: true },
+    ])
+
+    const file = await fs.contents('vite.config.ts')
+    assert.snapshot(file).matchInline(`
+      "import vue from 'vue'
+      import { foo } from 'foo'
+
+      export default {
+        plugins: [vue({ foo: 32 })],
+      }
+      "
+    `)
+  })
+
+  test('ignore duplicates when adding vite plugin', async ({ assert, fs }) => {
+    await fs.create(
+      'vite.config.ts',
+      `export default {
+        plugins: [],
+      }`
+    )
+
+    const transformer = new CodeTransformer(fs.baseUrl)
+
+    await transformer.addVitePlugin('vue({ foo: 32 })', [
+      { identifier: 'vue', module: 'vue', isNamed: false },
+      { identifier: 'foo', module: 'foo', isNamed: true },
+    ])
+
+    await transformer.addVitePlugin('vue({ foo: 32 })', [
+      { identifier: 'vue', module: 'vue', isNamed: false },
+      { identifier: 'foo', module: 'foo', isNamed: true },
+    ])
+
+    const file = await fs.contents('vite.config.ts')
+    assert.snapshot(file).matchInline(`
+      "import vue from 'vue'
+      import { foo } from 'foo'
+
+      export default {
+        plugins: [vue({ foo: 32 })],
+      }
+      "
+    `)
+  })
+
+  test('throw error when vite.config.ts file is missing', async ({ fs }) => {
+    const transformer = new CodeTransformer(fs.baseUrl)
+
+    await transformer.addVitePlugin('vue()', [{ identifier: 'vue', module: 'vue', isNamed: false }])
+  }).throws(/Cannot find vite\.config\.ts file/)
+
+  test('throw if no default export found', async ({ fs }) => {
+    await fs.create('vite.config.ts', `export const plugins = []`)
+    const transformer = new CodeTransformer(fs.baseUrl)
+
+    await transformer.addVitePlugin('vue()', [{ identifier: 'vue', module: 'vue', isNamed: false }])
+  }).throws(/Cannot find the default export/)
+
+  test('throw if plugins property is not found', async ({ fs }) => {
+    await fs.create('vite.config.ts', `export default {}`)
+    const transformer = new CodeTransformer(fs.baseUrl)
+
+    await transformer.addVitePlugin('vue()', [{ identifier: 'vue', module: 'vue', isNamed: false }])
+  }).throws(/Expected to find property named 'plugins'/)
+})