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+---
+stage: accepted
+start-date: 2026-01-12T00:00:00.000Z
+release-date: # In format YYYY-MM-DDT00:00:00.000Z
+release-versions:
+teams: # delete teams that aren't relevant
+  - cli
+  - framework
+  - typescript
+prs:
+  accepted: https://github.com/emberjs/rfcs/pull/1161
+project-link: 
+suite: 
+---
+
+<!--- 
+Directions for above: 
+
+stage: Leave as is
+start-date: Fill in with today's date, 2032-12-01T00:00:00.000Z
+release-date: Leave as is
+release-versions: Leave as is
+teams: Include only the [team(s)](README.md#relevant-teams) for which this RFC applies
+prs:
+  accepted: Fill this in with the URL for the Proposal RFC PR
+project-link: Leave as is
+suite: Leave as is
+-->
+
+<!-- Replace "RFC title" with the title of your RFC -->
+
+# Add `--no-compat` and `--minimal` modes to the Ember app blueprint
+
+## Summary
+
+This RFC proposes standardizing and supporting two new opt-in modes when generating apps from the Ember app blueprint (`@ember/app-blueprint`): `--no-compat` and `--minimal`.
+
+`--no-compat` generates an Ember app that intentionally omits legacy compatibility layers needed for older addon formats and older build/boot conventions. It prioritizes modern ESM tooling, significantly faster installs/builds/boot, and smoother integration with the broader Vite/ESM ecosystem.
+
+`--minimal` builds on `--no-compat` and additionally strips “project hygiene” tooling (linting/formatting/testing scaffolding), producing a small app shell well-suited for demos and for embedding Ember in other repositories and multi-framework environments (e.g. icon libraries, Vite plugin repos, Astro integrations).
+
+This RFC also documents the project intent to make “no-compat” the default for newly generated apps in a future major step, after ecosystem readiness and a clear transition path.
+
+## Motivation
+
+Ember’s “new app” experience increasingly targets modern JavaScript workflows: ESM-first packages, Vite-powered builds, and native browser capabilities. However, today’s default generated app must carry a set of compatibility layers to support:
+
+- older addon formats (notably v1 addons)
+- legacy build/boot wiring
+- legacy templating and HTML “content-for” integration points
+- Node-side configuration files and conventions
+
+Those layers are valuable for upgrading existing apps and for broad compatibility, but they impose real costs for brand-new apps:
+
+- Slower installs and heavier dependency trees (e.g. `ember-cli` and its transitive deps)
+- Slower build and boot, especially in large apps
+- Friction integrating Ember into “ESM-native” ecosystems (Vite SSR, Astro, etc.)
+
+We need first-class support for two distinct “new app” use-cases:
+
+1. **Modern Ember apps that do not need legacy compatibility**
+   - Apps that do not depend on v1 addons
+   - Apps that do not need HTML `content-for`
+   - Apps that want ESM-first conventions like `"type": "module"`
+
+2. **Ultra-light Ember shells for demos and integration**
+   - Minimal “it boots” projects for embedding Ember into other repos
+   - Multi-framework demo matrices (React/Vue/Svelte/Ember) where the repo uses a shared test harness and linting strategy
+   - Integration spikes in other ecosystems (e.g. Iconify, Vite plugin repos, Astro integrations), where the generated app is a fixture rather than a long-lived production app
+
+This RFC formalizes the public API surface introduced by these flags and sets expectations around support, documentation, and the migration path toward a future where “no-compat” can become the default.
+
+## Detailed design
+
+### Scope
+
+This RFC covers **the behavior and support commitments** for two generator flags on the Ember app blueprint, as implemented in `ember-cli/ember-app-blueprint` PR #49:
+
+- `--no-compat`
+- `--minimal`
+
+This RFC does **not** propose removing existing defaults today. The default remains the “compat” behavior. Instead, we:
+
+- document what these modes generate
+- define the supported/unsupported compatibility boundaries
+- describe the intent and prerequisites for making “no-compat” the default in the future
+
+### Terms
+
+- **compat mode**: the current default generated output which includes legacy compatibility support (notably `@embroider/compat` and the conventions it enables).
+- **no-compat mode**: an opt-in generated output with the compatibility layer removed.
+- **minimal mode**: an opt-in output built on no-compat, with additional removal of linting/formatting/testing scaffolding.
+
+### CLI surface area
+
+When generating a new app from `@ember/app-blueprint`, users may pass:
+
+- `--no-compat` (or equivalently `--compat=false`)
+- `--minimal`
+
+Precedence rules:
+
+- `--minimal` **forces** `no-compat` behavior.
+- If `--minimal` is set, explicit `--compat`/`--no-compat` flags are ignored.
+
+### Behavioral summary
+
+#### `--no-compat`
+
+When `--no-compat` is enabled, the generated app prioritizes ESM and modern tooling and removes older compatibility features.
+
+It includes the following high-level changes (as in PR #49):
+
+- **ESM by default**
+  - `package.json` includes `"type": "module"`
+  - Adds an `imports` map for ergonomic subpath imports (e.g. `#app/*`, `#config`, `#components/*`).
+
+- **Node tooling expectations updated**
+  - `package.json` sets a modern minimum Node version (in PR #49: `engines.node: ">= 24"`).
+
+- **Remove legacy compatibility dependencies**
+  - Removes `@embroider/compat` and related compat-only dependencies.
+  - Removes `ember-cli` from the generated app’s devDependencies.
+    - Tradeoff: the generated project no longer includes local scaffolding via `ember g`.
+    - Mitigation: users can still run generators via `pnpm dlx ember-cli g ...` / `npx ember-cli g ...` when needed.
+
+- **Remove legacy features supported via compat**
+  - No v1 addon compatibility (the generated app assumes v2+ addons).
+  - No `.hbs` file support for components/tests (template compilation is handled via modern compilation and template-tag usage).
+  - No HTML `content-for` usage in HTML entrypoints.
+  - No Node-side `config/environment.js`-style “node-land config”. Instead, config is generated as an ESM module (in PR #49: `app/config/environment.ts`) which reads from `import.meta.env`.
+
+- **Vite integration changes**
+  - Vite config conditionally omits classic support when in no-compat mode.
+
+- **HTML entrypoints adjusted**
+  - `index.html` and `tests/index.html` are made conditional:
+    - In compat mode, they continue using `{{content-for ...}}` and Embroider virtual CSS/JS.
+    - In no-compat mode, they instead directly link app styles and omit `content-for` blocks.
+
+- **Testing harness adjustments** (when tests are present)
+  - The generated `config/environment` exports an `enterTestMode()` helper in non-minimal builds.
+  - `tests/test-helper` calls `enterTestMode()` in no-compat builds.
+  - `testem` is configured to run from `dist` in no-compat mode.
+
+#### `--minimal`
+
+`--minimal` is explicitly intended for **demos** and **integration fixtures**.
+
+It includes everything from `--no-compat` and additionally:
+
+- **Removes linting/formatting/testing scaffolding**
+  - Strips common `lint:*` and `format` scripts.
+  - Removes common lint/format/test devDependencies (eslint, prettier, ember-template-lint, qunit/testem, etc.).
+
+- **Inverts a couple of defaults to reduce “stuff” in the minimal app**
+  - Data layer defaults are more conservative:
+    - warp-drive becomes opt-in (`--warp-drive`), rather than something you later remove.
+  - “Welcome page” becomes opt-in (`--welcome`).
+
+- **Produces a very small runtime surface**
+  - Uses a strict application resolver oriented around explicit module discovery.
+  - Uses `import.meta.glob` to eagerly load key module categories.
+
+In other words:
+
+- `--minimal` implies `--no-compat`.
+- `--no-compat` does not imply `--minimal`.
+
+### Intent: making no-compat the default (future)
+
+This RFC records the intent to eventually make “no-compat” the default for newly generated apps.
+
+That shift is **not** proposed to happen immediately. It requires:
+
+- Addon ecosystem readiness (v2+ coverage for common needs)
+- Clear messaging for new users about what is/isn’t supported
+- A clear story for teams that still need compatibility (explicit `--compat` mode)
+
+The long-term goal is:
+
+- **Default**: no-compat (modern, faster, ESM-first)
+- **Opt-in**: compat mode for projects that need legacy support as long as the slower/long-tail upgrade process from existing compat-using projects
+- **Opt-in**: minimal mode for fixtures, demos, and embedded use-cases
+
+### Ecosystem and tooling implications
+
+#### Lint rules
+
+- `--no-compat` should continue to ship with lint/test defaults unless explicitly requested otherwise.
+- `--minimal` intentionally removes lint/test tooling, so no lint rules should be assumed.
+
+#### Ember Inspector / debuggability
+
+No-compat does not inherently reduce debuggability, but removing legacy tooling changes how apps are booted and where configuration comes from. Documentation and troubleshooting guides should be updated accordingly.
+
+#### SSR / Vite SSR
+
+The `type=module` default and the removal of legacy compat layers are aligned with Vite SSR and other ESM-first tooling. This RFC does not mandate a particular SSR solution but aims to remove common blockers.
+
+#### Addon ecosystem
+
+`--no-compat` draws a bright line: v1 addons are not supported in the generated project.
+
+This is both a feature (simpler, faster, modern) and a risk (some users will hit unsupported addons). The default remains compat for now to mitigate this.
+
+#### IDE support
+
+ESM + imports maps can improve editor navigation (e.g. `#app/*`), but requires that tooling understands `imports`. The generated output should remain aligned with common TypeScript/JS tooling.
+
+#### Blueprints and generators
+
+Because `ember-cli` is removed in `--no-compat`, generator UX changes. The recommended story is:
+
+- use `npx ember-cli g ...` / `pnpm dlx ember-cli g ...` when you need scaffolding
+- keep the generated project itself light by default
+
+## How we teach this
+
+We should teach this as a **mode switch for the generated app**, not as a new “framework feature”.
+
+Key messaging:
+
+- `--no-compat` is for **modern apps** that don’t need legacy addon/build compatibility.
+- `--minimal` is for **fixtures, demos, and embedding** Ember in other repos.
+
+Concrete teaching changes:
+
+1. Update the app blueprint README and Ember CLI docs to include an “Options” section describing:
+   - what each flag does
+   - what you give up
+   - who should use it
+
+2. Provide a small decision table:
+   - “Are you new to Ember?” → start with default (no-compat)
+   - “Do you need v1 addons?” → default/compat
+   - “Are you building an ESM-first app or want the fastest build/boot?” → `--no-compat`
+   - “Are you embedding Ember into another repo?” → `--minimal`
+
+3. Provide a follow-up guide: “From minimal to production”
+   - how to add linting
+   - how to add testing
+   - how to add routing/UI/etc.
+
+4. Call out the future direction explicitly:
+   - We intend “no-compat by default” in the future.
+   - `--minimal` remains a niche but valuable tool for integration and demos.
+
+## Drawbacks
+
+- **More public API surface area**: every new flag is a support commitment.
+- **Potential confusion for new users**:
+  - users may pick `--minimal` and be surprised there are no tests/lints.
+  - users may pick `--no-compat` and be surprised a v1 addon doesn’t work.
+- **Ecosystem fragmentation risk**: “compat” vs “no-compat” could lead to duplicated docs and support channels.
+- **Node version constraints**: setting a high minimum Node version may be a barrier in some environments.
+- **Generator/scaffolding UX tradeoff**: removing local `ember-cli` makes the generated app lighter, but removes the familiar `ember g` workflow unless invoked via `npx/pnpm dlx`.
+
+## Alternatives
+
+1. **Separate blueprints instead of flags**
+   - e.g. publish `@ember/app-blueprint-no-compat` and `@ember/app-blueprint-minimal`.
+   - Pros: fewer flags; clearer separation.
+   - Cons: more packages to discover/version; harder to share fixes across variants.
+
+2. **A single `--mode=` flag**
+   - e.g. `--mode=compat|no-compat|minimal`.
+   - Pros: explicit, scales to new modes.
+   - Cons: breaks existing expectations; adds parsing/UX complexity.
+
+3. **Keep everything as-is**
+   - Don’t add new modes.
+   - Cost: continued friction for modern apps and for embedding Ember in other ecosystems; continued overhead for users who don’t need legacy compatibility, will result in forks of blueprinting entirely.
+
+4. **Make no-compat the default immediately**
+   - Pros: forces ecosystem to modernize.
+   - Cons: too disruptive; poor onboarding experience until addons/docs are ready.
+
+## Unresolved questions
+
+n/a
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