Open Source VS Code Extension

Catch regressions in your diff, not in CI or production.

Mewra PreFlight is the pre-push control tower for VS Code. It runs diff-scoped linters, formatters, type-checkers, secret scans, and manual checklists across your stack — unlocking a one-click PR launch only when your changes are clean.

Install in VS Code Source Code ↗

The In-Editor Control Tower

Real VS Code Extension Development Host execution — click tabs to see each pipeline state.

Mewra PreFlight — VS Code Webview Panel

Shortcut: Alt+Shift+P

Mewra PreFlight: Failed Check with In-Editor QuickFix

Blockers Caught Early with Clickable Findings & One-Click QuickFix

PreFlight detects that app.tsx is unformatted. A single click on 'Fix' repairs the file. Missing tools (ESLint) degrade gracefully to 'not-configured' with an Install button instead of crashing.

1 Blocker (Red) Prettier Fix All ESLint (Not Configured) PR Launch Locked

Why In-Editor Diff Sanity Beats Pre-Push Git Hooks

Traditional pre-push hooks are friction-heavy terminal scripts. PreFlight gives you instant, visual feedback before you push.

Traditional Git Pre-Push Hooks

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Runs too late: Triggers only after typing git push in your shell, jarring you out of your workflow.
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Terminal wall of text: Unclickable file paths and lines with zero inline quick-fixes.
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Fragile scripts: If a teammate doesn't have a binary installed globally, the hook crashes their push entirely.
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Slow entire-repo scans: Often re-checks untouched code, dragging push latency to 30+ seconds.
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Bypassed with --no-verify: Developers get frustrated and skip verification altogether.

Mewra PreFlight Control Tower

✅
In-editor on demand: Trigger with Alt+Shift+P whenever you're ready to review your progress.
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Direct file:line navigation: Click any finding to open the exact file and line in your active editor.
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Bring Your Own Tool (BYOT): Resolves node_modules, .venv, or vendor. Missing tools show not-configured with an Install button.
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Strictly diff-scoped: Only analyzes modified lines against main, finishing in milliseconds (1ms–400ms).
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One-click PR Launcher: Pushes your branch and drafts a structured PR description on GitHub or GitLab automatically.

Polyglot Ecosystem Packs

Zero configuration required. PreFlight detects active languages and runs project-local tooling.

TypeScript / JavaScript

Built-in Pack

Prettier	prettier --check
ESLint	eslint --format json
TypeScript	tsc --noEmit (diff-filtered)
Test Pairing	.ts ➔ .test.ts

Python

Built-in Pack

Ruff / Black	ruff format / black
Ruff / Flake8	ruff check / flake8
MyPy	mypy <diff-files>
Test Pairing	<mod>.py ➔ test_<mod>.py

Built-in Pack

gofmt	gofmt -l <diff-files>
go vet	go vet ./... (packages)
golangci-lint	golangci-lint run
Test Pairing	.go ➔ _test.go

PHP

Built-in Pack

PHP-CS-Fixer	php-cs-fixer --dry-run
PHPStan / Psalm	phpstan analyse
Test Pairing	Class.php ➔ ClassTest.php
Composer	vendor/bin resolution

Language-Agnostic Guardrails & Custom Checks

Common developer pitfalls caught automatically over added diff lines only.

Universal Secret & Leak Guard

Scans only newly added git diff lines for accidentally staged credentials, OpenAI/AWS tokens, private keys, or .env file content before it reaches your repository.

API Keys JWT Tokens Private Certificates .env Staged Lines

Clean Code Sanity Checks

Catch stray debugging leftovers before code review: console.log, debugger, print(), dd(), var_dump(), hardcoded localhost:* URLs, and unresolved merge markers.

No console.log No debugger No Localhost URLs Merge Conflicts

File-Triggered Manual Checklists

Define team verification items that only appear when relevant files are touched. Did you touch prisma/migrations/**? PreFlight automatically displays: "Applied DB migration to dev cluster".

Conditional Glob Triggers Human Verification Agent Checkable

Native Model Context Protocol (MCP) Server

PreFlight exposes a native VS Code MCP server. AI coding agents running in your editor can inspect pipeline diagnostics, run verification loops, and confirm code cleanliness without terminal scraping.

Claude Code Cursor OpenCode Codex

Exposes strictly scoped tools: get_preflight_status, get_check_findings, run_check, and mark_manual_check. Arbitrary shell execution is completely locked down.

// AI Agent calls PreFlight MCP Server
const status = await mcp.get_preflight_status();

if (!status.isClean) {
  const findings = await mcp.get_check_findings("prettier");
  // Agent fixes src/webview/app.tsx:1
  await editor.applyEdit(findings);

  // Re-verify immediately
  const result = await mcp.run_check("prettier");
  // result: { status: "pass", findings: [] }
}

Mewra Suite Synergy & Roadmap

PreFlight acts as the host for first-party companion extensions and upcoming releases.

Version	Status	Scope & Companion Integrations
v0.1.0	Current	Diff-scoped Host & Built-in Packs: Universal guardrails, Polyglot packs (JS/TS, Python, Go, PHP), Community JSON packs, Interactive manual checklists, Native Model Context Protocol (MCP) server.
v0.2.0	Planned	Mewra Pounce Integration: Surface blast radius & impacted API routes directly in the PreFlight dashboard; auto-attach Mermaid reverse call hierarchy diagrams to PR drafts; `.preflightignore` file support.
v0.3.0	Planned	First-Party Contributed Packs: Mewra Dependency Guard (OSV/Trivy lockfile CVE scans), ORM Cost Sentry (N+1 query & unindexed migration alerts), Mewra Style Guardian (AST token & Tailwind conflict checks), Local trend & history tracking.
v1.0.0	Future	Mewra Drift & Git Hooks: API contract drift detection (OpenAPI vs implementation), automated one-click `.git/hooks/pre-push` headless CLI installer, first official production-stable release across VS Code Marketplace and Open VSX.

Keep your git history clean.

Install Mewra PreFlight in VS Code today and never push broken code or forgotten console.logs again.

Install in VS Code Marketplace ↗