schickling

Flaky CI failure on Namespace macOS arm64 runners: invalid Nix store paths

Summary

We are seeing an intermittent CI failure on Namespace-managed GitHub Actions runners (macOS arm64) where Nix evaluation fails because the runner's /nix/store appears internally inconsistent (store DB references paths that don't exist).

This is not a flaky unit/integration test: the failure happens before our actual tests run.

Symptoms

schickling

check:quick --mode before Performance Investigation

Problem

devenv tasks run check:quick --mode before --no-tui takes ~623s (10+ minutes).

What check:quick runs

check:quick is a pure aggregation task (no exec). With --mode before, it runs all upstream deps:

schickling

require "active_record"

namespace :db do

  db_config       = YAML::load(File.open('config/database.yml'))
  db_config_admin = db_config.merge({'database' => 'postgres', 'schema_search_path' => 'public'})

  desc "Create the database"
  task :create do
    ActiveRecord::Base.establish_connection(db_config_admin)

schickling

CLI Output Architecture

Problem Statement

A CLI command can run in different output modes depending on context. We want to decouple command state/logic from output rendering to enable code sharing and principled divergence.

---

Requirements

schickling

pnpm Issues

---

PNPM-01: file: dependencies cause TypeScript errors

Status: SOLVED - Use link: protocol (primary) + enableGlobalVirtualStore (for remaining file: deps)

For a detailed comparison of bun vs pnpm monorepo linking behavior, see: https://gist.github.com/schickling/d05fe50fe4ffb1c2e9e48c8623579d7e

schickling

SIGTRAP Crash Reproduction: LiveStore + Bun + WASM SQLite

This document provides comprehensive context for reproducing and debugging a SIGTRAP crash that occurs when using LiveStore with Bun.

Problem Description

When creating and destroying ~100-180 LiveStore instances sequentially (each backed by SQLite WASM via wa-sqlite), Bun crashes with a SIGTRAP signal (Trace or breakpoint trap).

Key Characteristics

schickling

Devenv + flake path input interop (.devenv.flake.nix)

Problem (short)

When a repo is used as a path flake input inside another repo’s devenv, devenv expects <input>/.devenv.flake.nix to exist. If that file is untracked, it is not included in the flake snapshot, so devenv shell fails with:

error: '/nix/store/<...>/effect-utils/.devenv.flake.nix' does not exist

schickling

Playwright duplicate loading in dotdot setups

Status

Active investigation. The root cause is understood but the final workaround is not selected.

Problem statement

Playwright throws Error: Requiring @playwright/test second time when a shared config or helper package is linked via file: and both the consumer and the linked package resolve their own physical copies of @playwright/test. The Playwright runner enforces a singleton load and errors on the second physical path.

schickling

Nix Dirty Workspace Experiments (effect-utils)

Scope and Goals

We need a fast, reliable, pure way to build Bun-based native CLIs from TypeScript that:

• works with dirty/uncommitted changes,
• avoids copying large trees like node_modules,
• works in flakes and devenv,
• keeps dirty builds close to clean build performance.

schickling

Effect HttpClient Usage Guide

Minimal verified recipe (Bun + FetchHttpClient)

• Tested against httpbin; includes retries, base URL, schema decoding.

import { FetchHttpClient, HttpClient, HttpClientRequest, HttpClientResponse } from "@effect/platform"
import { Effect, Schema, Schedule } from "effect"

const Args = Schema.Record({ key: Schema.String, value: Schema.String })