diff --git a/CHANGELOG.md b/CHANGELOG.md
index e9f7ba6..8cefc3c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.21.0] - 2026-05-02
+
+### Added
+- Top-level `type` field in `.goodchangesrc.json` (`"library"` or `"app"`). When set, overrides the automatic library-vs-app inference from `package.json`. Invalid values cause a fatal error at startup.
+
 ## [0.20.0] - 2026-05-01
 
 ### Changed
@@ -287,6 +292,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Multi-stage Docker build
 - Automated vendor upgrade workflow
 
+[0.21.0]: https://github.com/gooddata/gooddata-goodchanges/compare/v0.20.0...v0.21.0
 [0.20.0]: https://github.com/gooddata/gooddata-goodchanges/compare/v0.19.4...v0.20.0
 [0.19.4]: https://github.com/gooddata/gooddata-goodchanges/compare/v0.19.3...v0.19.4
 [0.19.3]: https://github.com/gooddata/gooddata-goodchanges/compare/v0.19.2...v0.19.3
diff --git a/README.md b/README.md
index ec7c48a..8ed32b6 100644
--- a/README.md
+++ b/README.md
@@ -69,7 +69,9 @@ JSON array of target objects:
 
 ## Library vs app detection
 
-A package is classified as a **library** if its `package.json` contains any of:
+Detection can be overridden by setting the top-level `type` field in `.goodchangesrc.json` to `"library"` or `"app"` (see [Configuration](#configuration)). When unset, classification is inferred.
+
+A package is inferred as a **library** if its `package.json` contains any of:
 
 - `types` (TypeScript type declarations)
 - `exports` (modern package exports field)
@@ -77,7 +79,7 @@ A package is classified as a **library** if its `package.json` contains any of:
 
 Libraries get full AST-level analysis: entrypoint resolution, symbol diffing, and taint propagation through their internal import graph.
 
-Everything else is an **app** (bundled). Apps are not analyzed for granular exports -- if any file in an app changes, the app is considered fully tainted.
+Everything else is inferred as an **app** (bundled). Apps are not analyzed for granular exports -- if any file in an app changes, the app is considered fully tainted.
 
 ## Configuration
 
@@ -152,11 +154,12 @@ Each `changeDirs` entry is an object with:
 
 **Top-level fields:**
 
-| Field        | Type          | Description                                                                                             |
-|--------------|---------------|---------------------------------------------------------------------------------------------------------|
-| `targets`    | `TargetDef[]` | Array of target definitions (see below)                                                                 |
-| `ignores`    | `string[]`    | Glob patterns for files to exclude from change detection                                                |
-| `changeDirs` | `ChangeDir[]` | Global changeDirs. When triggered, taints all library exports and triggers all targets in this package. |
+| Field        | Type                 | Description                                                                                                                                                                    |
+|--------------|----------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `type`       | `"library" \| "app"` | Optional. Forces this package's classification, skipping the inference described in [Library vs app detection](#library-vs-app-detection). Invalid values cause a fatal error. |
+| `targets`    | `TargetDef[]`        | Array of target definitions (see below)                                                                                                                                        |
+| `ignores`    | `string[]`           | Glob patterns for files to exclude from change detection                                                                                                                       |
+| `changeDirs` | `ChangeDir[]`        | Global changeDirs. When triggered, taints all library exports and triggers all targets in this package.                                                                        |
 
 **TargetDef fields (each entry in `targets`):**
 
diff --git a/VERSION b/VERSION
index a881cf7..1db0ede 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.20.0
\ No newline at end of file
+0.21.0
\ No newline at end of file
diff --git a/internal/analyzer/analyzer.go b/internal/analyzer/analyzer.go
index 1f990fd..bdd5ff0 100644
--- a/internal/analyzer/analyzer.go
+++ b/internal/analyzer/analyzer.go
@@ -32,7 +32,12 @@ type AffectedExport struct {
 }
 
 // IsLibrary determines if a package is a library (transpiled) vs a bundled app.
-func IsLibrary(pkg rush.PackageJSON) bool {
+// When the project config sets an explicit `type`, that value wins; otherwise
+// the result is inferred from package.json fields.
+func IsLibrary(pc *rush.ProjectConfig, pkg rush.PackageJSON) bool {
+	if pc != nil && pc.Type != nil {
+		return *pc.Type == "library"
+	}
 	if pkg.Types != "" {
 		return true
 	}
diff --git a/internal/rush/rush.go b/internal/rush/rush.go
index 0558380..a6e2bca 100644
--- a/internal/rush/rush.go
+++ b/internal/rush/rush.go
@@ -134,6 +134,7 @@ func (td TargetDef) OutputName(packageName string) string {
 }
 
 type ProjectConfig struct {
+	Type       *string     `json:"type,omitempty"`       // "library" or "app". When set, overrides automatic inference.
 	Targets    []TargetDef `json:"targets,omitempty"`
 	Ignores    []string    `json:"ignores,omitempty"`
 	ChangeDirs []ChangeDir `json:"changeDirs,omitempty"` // global changeDirs: triggers all exports (library) or all targets (app)
diff --git a/main.go b/main.go
index 186606c..ff53c8a 100644
--- a/main.go
+++ b/main.go
@@ -104,6 +104,16 @@ func main() {
 	projectMap := rush.BuildProjectMap(rushConfig)
 	configMap := rush.LoadAllProjectConfigs(rushConfig)
 
+	for projectFolder, cfg := range configMap {
+		if cfg == nil || cfg.Type == nil {
+			continue
+		}
+		if *cfg.Type != "library" && *cfg.Type != "app" {
+			fmt.Fprintf(os.Stderr, "Invalid type %q in %s/.goodchangesrc.json: must be \"library\" or \"app\"\n", *cfg.Type, projectFolder)
+			os.Exit(1)
+		}
+	}
+
 	// Parse TARGETS filter early to skip expensive detection for non-matching targets
 	var targetPatterns []string
 	if targetsEnv := os.Getenv("TARGETS"); targetsEnv != "" {
@@ -208,7 +218,7 @@ func main() {
 		if info == nil {
 			continue
 		}
-		if analyzer.IsLibrary(info.Package) {
+		if analyzer.IsLibrary(configMap[rp.ProjectFolder], info.Package) {
 			if allUpstreamTaint[rp.PackageName] == nil {
 				allUpstreamTaint[rp.PackageName] = make(map[string]bool)
 			}
@@ -233,7 +243,7 @@ func main() {
 				continue
 			}
 			pkg := info.Package
-			lib := analyzer.IsLibrary(pkg)
+			lib := analyzer.IsLibrary(configMap[info.ProjectFolder], pkg)
 			directlyChanged := changedProjects[pkgName] != nil
 			changedDeps := depChangedDeps[info.ProjectFolder]
 			isDepAffected := len(changedDeps) > 0