diff --git a/.changeset/blue-coats-roll.md b/.changeset/blue-coats-roll.md
new file mode 100644
index 0000000..0f7d26f
--- /dev/null
+++ b/.changeset/blue-coats-roll.md
@@ -0,0 +1,6 @@
+---
+"rollup-plugin-glimmer-template-tag": minor
+---
+
+The entirety of the `<template>` transform is done in rollup.
+Now folks don't need to remember to configure babel _in addition_ to the existing needed rollup config.
diff --git a/.gitignore b/.gitignore
index 6704566..5ed3ca0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -91,6 +91,9 @@ dist
 # vuepress build output
 .vuepress/dist
 
+# Turbo cache
+.turbo/
+
 # Serverless directories
 .serverless/
 
diff --git a/README.md b/README.md
index 3375749..f6b2f83 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,6 @@ First and foremost, this repo's test-packages contain examples of
 
 For specifics, the `packages/**` folder may provide value.
 
-
 ### Rollup
 
 
@@ -27,6 +26,7 @@ The first step is add the rollup plugin, which will
 understand the `<template>` tag `gjs` and `gts` files:
 
 ```js
+// rollup.config.mjs
 import { Addon } from '@embroider/addon-dev/rollup';
 
 import { glimmerTemplateTag } from 'rollup-plugin-glimmer-template-tag';
@@ -48,27 +48,7 @@ export default {
 };
 ```
 
-For `gjs` files, the next line would be to run the babel plugin, which uses the
-config we extended earlier and transpiles the intermediate format into the final
-`js` files.
-
-### Babel
-
-Add the `ember-template-imports` babel plugin to your babel config:
-
-```diff
- 'use strict';
-
- module.exports = {
-   plugins: [
-+    'ember-template-imports/src/babel-plugin',
-     '@embroider/addon-dev/template-colocation-plugin',
-     ['@babel/plugin-proposal-decorators', { legacy: true }],
-     '@babel/plugin-proposal-class-properties'
-   ]
- };
-```
-
+And that's it!
 
 ### Configure `rollup-plugin-ts` (TS Only)
 
@@ -88,3 +68,64 @@ For typescript, a config change is required to allow the transpilation to happen
 Background: `rollup-plugin-ts` uses your input files (the intermediate format
 from the step above) to typecheck them, which in our case will always error.
 Telling `rollup-plugin-ts` to only transpile won't typecheck.
+
+Since you want only the _source files_ to be type-checked, it's best to use a `lint:types`
+script for type checking, and pre-publish checking both locally and in your C.I. environment.
+This repo is an example of how to set that up if this is unfamiliar.
+```
+"lint:types": "glint"
+```
+
+When using this method of type checking, the line numbers in errors will continue to match up.
+
+#### Without type errors blocking the addon's build? what happens with the generated type declarations?
+
+The errors are copied in to the type declaration files so that consumers would be alerted to the type errors.
+For example, given this component where we forget to import the type for the `RouterService`:
+```ts 
+import Component from '@glimmer/component';
+import { service } from '@ember/service';
+
+export default class TsClassDemo extends Component {
+  @service declare router: RouterService;
+
+  greeting = 'Hello World!';
+
+  <template>
+    TS Class Demo: {{this.greeting}}
+  </template>
+}
+```
+
+The generated declaration for for this component is:
+```ts
+// dist/components/ts-class-demo.d.ts
+import Component from '@glimmer/component';
+declare class TsClassDemo extends Component {
+    router: RouterService;
+    greeting: string;
+}
+export { TsClassDemo as default };
+```
+which _also_ excludes the type for `RouterService`. 
+If an addon is using a test-app for its tests and that test-app has typescript, the test-app will report a type error when trying to resolve the type of `TsClassDemo`.
+
+
+#### What about `transpileOnly: false`?
+
+Without setting `transpileOnly: true` (using the default or explicitly setting to `false`), 
+
+- line number-errors will not match up as the input to rollup-plugin-ts is the output from the `<template>` transformation.
+
+- you'll receive errors like the following
+
+    ```
+    [!] (plugin Typescript) RollupError: Cannot find module '@ember/template-compilation' or its corresponding type declarations.
+    src/components/ts-class-demo.ts (2:36)
+
+    2 import { precompileTemplate } from "@ember/template-compilation";
+                                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    ```
+    This exposes internal information about the `<template>` transformation process. 
+    Though, you could try to get around the issue if you _really_ want `transpileOnly: false` by `declare module`ing for `@ember/template-compilation` in your `unpublished-development-types` _except_ that `@ember/template-compilation` is not presently a real package, so the part of the error saying `Cannot find module ` is still true, even though a corresponding type declaration is defined -- both the module and the type declarations are needed.
+
diff --git a/packages/rollup-plugin-glimmer-template-tag/package.json b/packages/rollup-plugin-glimmer-template-tag/package.json
index 15c5fed..ef97fb3 100644
--- a/packages/rollup-plugin-glimmer-template-tag/package.json
+++ b/packages/rollup-plugin-glimmer-template-tag/package.json
@@ -37,8 +37,10 @@
     "extends": "../../package.json"
   },
   "devDependencies": {
+    "@babel/core": "^7.21.3",
     "@nullvoxpopuli/eslint-configs": "^3.1.3",
     "@tsconfig/node16-strictest-esm": "^1.0.3",
+    "@types/babel__core": "^7.20.0",
     "@types/node": "^18.15.3",
     "@typescript-eslint/eslint-plugin": "^5.55.0",
     "@typescript-eslint/parser": "^5.55.0",
@@ -51,6 +53,7 @@
     "typescript": "^4.9.5"
   },
   "peerDependencies": {
+    "@babel/core": "^7.21.3",
     "ember-source": "^4.0.0 || ^5.0.0",
     "ember-template-imports": "^3.4.1"
   }
diff --git a/packages/rollup-plugin-glimmer-template-tag/src/rollup-plugin.js b/packages/rollup-plugin-glimmer-template-tag/src/rollup-plugin.js
index 6bf0ca7..b385e77 100644
--- a/packages/rollup-plugin-glimmer-template-tag/src/rollup-plugin.js
+++ b/packages/rollup-plugin-glimmer-template-tag/src/rollup-plugin.js
@@ -6,6 +6,7 @@
 import fs from 'node:fs/promises';
 import path from 'node:path';
 
+import * as babel from '@babel/core';
 import { preprocessEmbeddedTemplates } from 'ember-template-imports/lib/preprocess-embedded-templates.js';
 import { TEMPLATE_TAG_NAME, TEMPLATE_TAG_PLACEHOLDER } from 'ember-template-imports/lib/util.js';
 
@@ -49,7 +50,7 @@ export function glimmerTemplateTag() {
       }
 
       if (RELEVANT_EXTENSION_REGEX.test(originalId)) {
-        return await preprocessTemplates(originalId);
+        return transformGlimmerTemplateTag(originalId);
       }
 
       return;
@@ -57,6 +58,53 @@ export function glimmerTemplateTag() {
   };
 }
 
+/**
+ * @param {string} originalId
+ */
+async function transformGlimmerTemplateTag(originalId) {
+  let intermediate = await preprocessTemplates(originalId);
+
+  let config = await babel.loadPartialConfigAsync();
+
+  // Use the basename so we don't accidentally operate on real files
+  let filename = path.basename(originalId);
+
+  /**
+   * Because we need to parse the user's code,
+   * we can't assume that they're not using custom plugins / syntax.
+   *
+   * So we *must* use their babel config, and then _only_
+   * do the ember-template-imports transform.
+   */
+  let ast = await babel.parseAsync(intermediate, {
+    ...config?.options,
+    filename,
+    ast: true,
+    sourceMaps: 'inline',
+  });
+
+  if (!ast) {
+    throw new Error('Failed to parse the intermediate output in to Babel AST');
+  }
+
+  let result = await babel.transformFromAstAsync(ast, intermediate, {
+    babelrc: false,
+    configFile: false,
+    sourceMaps: 'inline',
+    filename: path.basename(originalId),
+    // Babel defaults to "guessing" when there is no browserslist past
+    // We want to do the least amount of work
+    browserslistEnv: 'last 1 firefox versions',
+    plugins: ['ember-template-imports/src/babel-plugin'],
+  });
+
+  if (result?.code) {
+    return result.code;
+  }
+
+  throw new Error('Failed to generate code from Babel AST');
+}
+
 /**
  * @param {string} originalId
  */
diff --git a/packages/test-rollup-addon-gjs/babel.config.json b/packages/test-rollup-addon-gjs/babel.config.json
index 0dfd323..cfcf8a3 100644
--- a/packages/test-rollup-addon-gjs/babel.config.json
+++ b/packages/test-rollup-addon-gjs/babel.config.json
@@ -1,6 +1,5 @@
 {
   "plugins": [
-    "ember-template-imports/src/babel-plugin",
     "@embroider/addon-dev/template-colocation-plugin",
     ["@babel/plugin-proposal-decorators", { "legacy": true }],
     "@babel/plugin-proposal-class-properties"
diff --git a/packages/test-rollup-addon-gts/babel.config.json b/packages/test-rollup-addon-gts/babel.config.json
index 2b3c751..4ea9ac2 100644
--- a/packages/test-rollup-addon-gts/babel.config.json
+++ b/packages/test-rollup-addon-gts/babel.config.json
@@ -1,7 +1,12 @@
 {
   "presets": ["@babel/preset-typescript"],
   "plugins": [
-    "ember-template-imports/src/babel-plugin",
+    [
+      "@babel/plugin-transform-typescript",
+      {
+        "allowDeclareFields": true
+      }
+    ],
     "@embroider/addon-dev/template-colocation-plugin",
     ["@babel/plugin-proposal-decorators", { "legacy": true }],
     "@babel/plugin-proposal-class-properties"
diff --git a/packages/test-rollup-addon-gts/rollup.config.mjs b/packages/test-rollup-addon-gts/rollup.config.mjs
index 73989b0..5eaf038 100644
--- a/packages/test-rollup-addon-gts/rollup.config.mjs
+++ b/packages/test-rollup-addon-gts/rollup.config.mjs
@@ -17,7 +17,9 @@ export default defineConfig({
     glimmerTemplateTag(),
     typescript({
       transpiler: 'babel',
-      browserslist: false,
+      // Babel defaults to "guessing" when there is no browserslist past
+      // We want to do the least amount of work
+      browserslist: ['last 1 firefox versions'],
       transpileOnly: true,
     }),
     addon.dependencies(),
diff --git a/packages/test-rollup-addon-gts/src/components/ts-class-demo.gts b/packages/test-rollup-addon-gts/src/components/ts-class-demo.gts
index f0b9040..59ced50 100644
--- a/packages/test-rollup-addon-gts/src/components/ts-class-demo.gts
+++ b/packages/test-rollup-addon-gts/src/components/ts-class-demo.gts
@@ -1,6 +1,12 @@
 import Component from '@glimmer/component';
+import { service } from '@ember/service';
+
+import type RouterService from '@ember/routing/router-service';
 
 export default class TsClassDemo extends Component {
+  // Need TS Syntax for confident test
+  @service declare router: RouterService;
+
   greeting = 'Hello World!';
 
   <template>
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 5eaf2f9..8b1347c 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -16,8 +16,10 @@ importers:
 
   packages/rollup-plugin-glimmer-template-tag:
     specifiers:
+      '@babel/core': ^7.21.3
       '@nullvoxpopuli/eslint-configs': ^3.1.3
       '@tsconfig/node16-strictest-esm': ^1.0.3
+      '@types/babel__core': ^7.20.0
       '@types/node': ^18.15.3
       '@typescript-eslint/eslint-plugin': ^5.55.0
       '@typescript-eslint/parser': ^5.55.0
@@ -29,13 +31,15 @@ importers:
       rollup: ^3.19.1
       typescript: ^4.9.5
     devDependencies:
-      '@nullvoxpopuli/eslint-configs': 3.1.3_hvzxzc6stzjpchxxrjoxfelo6e
+      '@babel/core': 7.21.3
+      '@nullvoxpopuli/eslint-configs': 3.1.3_4tjkbzjaj6bzvwh4cjbnha3b3i
       '@tsconfig/node16-strictest-esm': 1.0.3
+      '@types/babel__core': 7.20.0
       '@types/node': 18.15.3
       '@typescript-eslint/eslint-plugin': 5.55.0_342y7v4tc7ytrrysmit6jo4wri
       '@typescript-eslint/parser': 5.55.0_vgl77cfdswitgr47lm5swmv43m
       concurrently: 7.6.0
-      ember-source: 4.11.0
+      ember-source: 4.11.0_@babel+core@7.21.3
       ember-template-imports: 3.4.1
       eslint: 8.36.0
       prettier: 2.8.4
@@ -3125,7 +3129,7 @@ packages:
       - supports-color
     dev: true
 
-  /@nullvoxpopuli/eslint-configs/3.1.3_hvzxzc6stzjpchxxrjoxfelo6e:
+  /@nullvoxpopuli/eslint-configs/3.1.3_4tjkbzjaj6bzvwh4cjbnha3b3i:
     resolution: {integrity: sha512-55sKdkcewceBRUMoF5HSv5cbHX0ZIHkv6ObpZha0g73U7leR26sGIAO2Vxxnu0fmktwmMVJBjQvq7jpqO0VJ9A==}
     engines: {node: '>= v16.0.0'}
     peerDependencies:
@@ -3153,6 +3157,7 @@ packages:
       prettier:
         optional: true
     dependencies:
+      '@babel/core': 7.21.3
       '@typescript-eslint/eslint-plugin': 5.55.0_342y7v4tc7ytrrysmit6jo4wri
       '@typescript-eslint/parser': 5.55.0_vgl77cfdswitgr47lm5swmv43m
       cosmiconfig: 8.1.0
@@ -3357,6 +3362,35 @@ packages:
     resolution: {integrity: sha512-2TN6oiwtNjOezilFVl77zwdNPwQWaDBBCCWWxyo1ctiO3vAtd7H/aB/CBJdw9+kqq3+latD0SXoedIuHySSZWw==}
     dev: true
 
+  /@types/babel__core/7.20.0:
+    resolution: {integrity: sha512-+n8dL/9GWblDO0iU6eZAwEIJVr5DWigtle+Q6HLOrh/pdbXOhOtqzq8VPPE2zvNJzSKY4vH/z3iT3tn0A3ypiQ==}
+    dependencies:
+      '@babel/parser': 7.21.3
+      '@babel/types': 7.21.3
+      '@types/babel__generator': 7.6.4
+      '@types/babel__template': 7.4.1
+      '@types/babel__traverse': 7.18.3
+    dev: true
+
+  /@types/babel__generator/7.6.4:
+    resolution: {integrity: sha512-tFkciB9j2K755yrTALxD44McOrk+gfpIpvC3sxHjRawj6PfnQxrse4Clq5y/Rq+G3mrBurMax/lG8Qn2t9mSsg==}
+    dependencies:
+      '@babel/types': 7.21.3
+    dev: true
+
+  /@types/babel__template/7.4.1:
+    resolution: {integrity: sha512-azBFKemX6kMg5Io+/rdGT0dkGreboUVR0Cdm3fz9QJWpaQGJRQXl7C+6hOTCZcMll7KFyEQpgbYI2lHdsS4U7g==}
+    dependencies:
+      '@babel/parser': 7.21.3
+      '@babel/types': 7.21.3
+    dev: true
+
+  /@types/babel__traverse/7.18.3:
+    resolution: {integrity: sha512-1kbcJ40lLB7MHsj39U4Sh1uTd2E7rLEa79kmDpI6cy+XiXsteB3POdQomoq4FxszMrO3ZYchkhYJw7A2862b3w==}
+    dependencies:
+      '@babel/types': 7.21.3
+    dev: true
+
   /@types/body-parser/1.19.2:
     resolution: {integrity: sha512-ALYone6pm6QmwZoAgeyNksccT9Q4AWZQ6PvfwR37GT6r6FWUPguq6sUmNGSMV2Wr761oQoBxwGGa6DR5o1DC9g==}
     dependencies:
@@ -7670,7 +7704,7 @@ packages:
       - encoding
     dev: true
 
-  /ember-source/4.11.0:
+  /ember-source/4.11.0_@babel+core@7.21.3:
     resolution: {integrity: sha512-SNRHsQOvF3C9emS7Rg4zcFdwY6aiSkV/7CG+KBpmzLY6hIWQNruzEDZINpNgqBn7CicAJ6g573WG7zu6458agQ==}
     engines: {node: '>= 14.*'}
     peerDependencies:
@@ -7680,10 +7714,10 @@ packages:
         optional: true
     dependencies:
       '@babel/helper-module-imports': 7.18.6
-      '@babel/plugin-transform-block-scoping': 7.21.0
+      '@babel/plugin-transform-block-scoping': 7.21.0_@babel+core@7.21.3
       '@ember/edition-utils': 1.2.0
-      '@glimmer/vm-babel-plugins': 0.84.2
-      babel-plugin-debug-macros: 0.3.4
+      '@glimmer/vm-babel-plugins': 0.84.2_@babel+core@7.21.3
+      babel-plugin-debug-macros: 0.3.4_@babel+core@7.21.3
       babel-plugin-filter-imports: 4.0.0
       broccoli-concat: 4.2.5
       broccoli-debug: 0.6.5