new: Add new experiments setting.

crates/core/test-utils/src/cli.rs

@@ -18,8 +18,6 @@ pub fn create_moon_command<T: AsRef<Path>>(path: T) -> assert_cmd::Command {
     // Enable logging for code coverage
     cmd.env("MOON_LOG", "trace");
     cmd.env("PROTO_LOG", "trace");
-    // Feature flags
-    // cmd.env("MOON_DISABLE_OVERLAPPING_OUTPUTS", "true");
     cmd
 }
 

nextgen/config/src/workspace/experiments_config.rs

@@ -0,0 +1,10 @@
+use moon_common::cacheable;
+use schematic::{env, Config};
+
+cacheable!(
+    #[derive(Config, Debug)]
+    pub struct ExperimentsConfig {
+        #[setting(default = true, env = "MOON_DISABLE_OVERLAPPING_OUTPUTS", parse_env = env::parse_bool)]
+        pub task_output_boundaries: bool,
+    }
+);

nextgen/config/src/workspace/mod.rs

@@ -1,5 +1,6 @@
 mod codeowners_config;
 mod constraints_config;
+mod experiments_config;
 mod generator_config;
 mod hasher_config;
 mod notifier_config;
@@ -8,6 +9,7 @@ mod vcs_config;
 
 pub use codeowners_config::*;
 pub use constraints_config::*;
+pub use experiments_config::*;
 pub use generator_config::*;
 pub use hasher_config::*;
 pub use notifier_config::*;

nextgen/config/src/workspace_config.rs

@@ -98,6 +98,9 @@ pub struct WorkspaceConfig {
     #[setting(nested)]
     pub constraints: ConstraintsConfig,
 
+    #[setting(nested)]
+    pub experiments: ExperimentsConfig,
+
     #[setting(extend, validate = validate::extends_string)]
     pub extends: Option<String>,
 

nextgen/project-graph/src/project_graph.rs

@@ -1,7 +1,7 @@
 use crate::project_graph_error::ProjectGraphError;
 use miette::IntoDiagnostic;
 use moon_common::path::WorkspaceRelativePathBuf;
-use moon_common::{color, is_test_env, Id};
+use moon_common::{color, Id};
 use moon_config::DependencyScope;
 use moon_project::Project;
 use moon_project_expander::{ExpanderContext, ExpansionBoundaries, ProjectExpander};
@@ -15,7 +15,6 @@ use petgraph::Direction;
 use rustc_hash::FxHashMap;
 use serde::Serialize;
 use starbase_utils::json;
-use std::env;
 use std::path::{Path, PathBuf};
 use std::sync::{Arc, RwLock, RwLockReadGuard, RwLockWriteGuard};
 use tracing::{debug, trace};
@@ -66,8 +65,7 @@ impl ProjectGraph {
             projects: Arc::new(RwLock::new(FxHashMap::default())),
             workspace_root: workspace_root.to_owned(),
             query_cache: OnceMap::new(),
-            check_boundaries: !is_test_env()
-                && env::var("MOON_DISABLE_OVERLAPPING_OUTPUTS").is_err(),
+            check_boundaries: false,
         }
     }
 

nextgen/project-graph/src/project_graph_builder.rs

@@ -6,6 +6,7 @@ use crate::project_graph_hash::ProjectGraphHash;
 use crate::projects_locator::locate_projects_with_globs;
 use async_recursion::async_recursion;
 use moon_cache::CacheEngine;
+use moon_common::is_test_env;
 use moon_common::path::{to_virtual_string, WorkspaceRelativePath, WorkspaceRelativePathBuf};
 use moon_common::{color, consts, Id};
 use moon_config::{InheritedTasksManager, ToolchainConfig, WorkspaceConfig, WorkspaceProjects};
@@ -151,6 +152,7 @@ impl<'app> ProjectGraphBuilder<'app> {
     pub async fn build(mut self) -> miette::Result<ProjectGraph> {
         self.enforce_constraints()?;
 
+        let context = self.context.take().unwrap();
         let mut nodes = FxHashMap::default();
 
         for (id, index) in self.nodes {
@@ -172,11 +174,12 @@ impl<'app> ProjectGraphBuilder<'app> {
             });
         }
 
-        Ok(ProjectGraph::new(
-            self.graph,
-            nodes,
-            self.context.unwrap().workspace_root,
-        ))
+        let mut graph = ProjectGraph::new(self.graph, nodes, context.workspace_root);
+
+        graph.check_boundaries =
+            !is_test_env() && context.workspace_config.experiments.task_output_boundaries;
+
+        Ok(graph)
     }
 
     /// Load a single project by name or alias into the graph.

packages/cli/CHANGELOG.md

@@ -15,6 +15,8 @@
   - Graph edges now indicate the type of relationship: development, production, build, peer.
   - Updated `moon project-graph --json` to include the fully expanded graph data.
 - Identifiers (project names, file groups, etc) can now be prefixed with underscores (`_`).
+- Added Poetry detection support for Python projects.
+- Added an `experiments` setting to `.moon/workspace.yml`.
 - **Tasks**
   - Environment variables in `command` and `args` are now substituted.
   - Task `deps` can now depend on tag targets (`#tag:task`).

packages/types/src/project-config.ts

@@ -97,7 +97,7 @@ export interface PartialProjectConfig {
 export interface DependencyConfig {
 	id: string;
 	scope: DependencyScope;
-	source: DependencySource | null;
+	source: DependencySource;
 	via: string | null;
 }
 

packages/types/src/workspace-config.ts

@@ -16,6 +16,11 @@ export interface PartialConstraintsConfig {
 	tagRelationships?: Record<string, string[]> | null;
 }
 
+export interface PartialExperimentsConfig {
+	/** @default true */
+	taskOutputBoundaries?: boolean | null;
+}
+
 export interface PartialGeneratorConfig {
 	templates?: string[] | null;
 }
@@ -77,6 +82,7 @@ export interface PartialWorkspaceConfig {
 	$schema?: string | null;
 	codeowners?: PartialCodeownersConfig | null;
 	constraints?: PartialConstraintsConfig | null;
+	experiments?: PartialExperimentsConfig | null;
 	extends?: string | null;
 	generator?: PartialGeneratorConfig | null;
 	hasher?: PartialHasherConfig | null;
@@ -101,6 +107,11 @@ export interface ConstraintsConfig {
 	tagRelationships: Record<string, string[]>;
 }
 
+export interface ExperimentsConfig {
+	/** @default true */
+	taskOutputBoundaries: boolean;
+}
+
 export interface GeneratorConfig {
 	templates: string[];
 }
@@ -151,6 +162,7 @@ export interface WorkspaceConfig {
 	$schema: string;
 	codeowners: CodeownersConfig;
 	constraints: ConstraintsConfig;
+	experiments: ExperimentsConfig;
 	extends: string | null;
 	generator: GeneratorConfig;
 	hasher: HasherConfig;

website/docs/config/workspace.mdx

@@ -204,6 +204,25 @@ dependsOn: ['components']
 tags: ['react']
 ```
 
+## `experiments`<VersionLabel version="1.11.0" />
+
+<HeadingApiLink to="/api/types/interface/WorkspaceConfig#experiments" />
+
+Enable or disable experiments that alter core functionality.
+
+### `taskOutputBoundaries`
+
+<HeadingApiLink to="/api/types/interface/ExperimentsConfig#taskOutputBoundaries" />
+
+Enforces strict boundaries for task outputs and will error when multiple tasks write to the same
+output location. This includes output globs that overlap with literal output file paths. Defaults to
+`true`, and will be fully enabled by default in a future release.
+
+```yaml title=".moon/workspace.yml" {2}
+experiments:
+  taskOutputBoundaries: false
+```
+
 ## `generator`
 
 <HeadingApiLink to="/api/types/interface/WorkspaceConfig#generator" />

website/static/schemas/workspace.json

@@ -35,6 +35,16 @@
         }
       ]
     },
+    "experiments": {
+      "anyOf": [
+        {
+          "$ref": "#/definitions/PartialExperimentsConfig"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
     "extends": {
       "anyOf": [
         {
@@ -233,6 +243,24 @@
       },
       "additionalProperties": false
     },
+    "PartialExperimentsConfig": {
+      "title": "PartialExperimentsConfig",
+      "type": "object",
+      "properties": {
+        "taskOutputBoundaries": {
+          "default": true,
+          "anyOf": [
+            {
+              "type": "boolean"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        }
+      },
+      "additionalProperties": false
+    },
     "PartialGeneratorConfig": {
       "title": "PartialGeneratorConfig",
       "type": "object",