spm 0.2.0

Unified static analysis and runtime profiling for Flutter rebuild scopes and their triggers.

Scope Performance Metrics (SPM)

SPM finds rebuild scopes in Flutter projects and records the work performed by their build trees. It handles State.build() methods, consumer widgets, and builder callbacks from packages such as Bloc, Riverpod, and GetX.

Use the CLI to:

• extract static build-tree metrics as JSONL;
• check that a widget mutation changes structure without changing content or state;
• instrument State classes and collect profile-mode rebuild measurements;
• extract a rebuild scope into a smaller widget for isolated profiling.

The project wiki contains the command reference, JSONL schemas, metric definitions, and architecture notes. The package is published on pub.dev.

Project status

SPM began as tooling for collecting a research dataset pairing static build-tree metrics with profile-mode buildSpan measurements. The planned direction for 1.0.0 is a static screening tool that uses the build-tree metrics alone—without running or profiling the app—to classify a UI change by its expected effect on UI-thread frame build duration: stable or faster (0), or slower (1). This classifier is planned and is not available in the current release.

Install

Install the executable globally:

dart pub global activate spm

Or add SPM to a Flutter project as a development dependency:

flutter pub add dev:spm
dart run spm:spm analyze -o static.jsonl /path/to/flutter/project

Instrumented Flutter code imports the public API from package:spm/spm.dart.

Commands

spm analyze -o static.jsonl /path/to/flutter/project
spm validate --base base.dart --mutation mutation.dart --deps dependencies.dart --json
spm inject -j static.jsonl /path/to/flutter/project
spm run -j static.jsonl -r /path/to/flutter/project --flutter drive --target=integration_test/integration_test.dart
spm isolate -o isolated_widgets /path/to/flutter/project

Start with the wiki's Getting Started page for an end-to-end run. See example/spm_example.dart for the smallest public API example.

Repository layout

bin/         CLI entry point
lib/spm.dart supported Flutter integration API
lib/src/     internal implementation
test/        tests and fixtures
wiki/        separate Git repository for the project wiki

The companion benchmark_container repository contains the benchmark harness, sample corpus, measured datasets, and modeling scripts used with SPM.

Contributing

Read CONTRIBUTING.md before opening a pull request.