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🤖 Lazy-load AI SDK providers to reduce startup time (#233)
Fixes #231 ## Problem Startup time is 6-13s because all AI SDK providers load eagerly at module initialization, even though only one provider is used per session. ## Solution **Lazy-load AI SDK dependencies** — providers now load on-demand using dynamic imports: 1. **Tools**: lazy-loads provider-specific web_search tools 2. **Models**: lazy-loads Anthropic/OpenAI providers on first use 3. **Cleanup**: Removed unused @ai-sdk/google dependency ## Regression Prevention Added CI checks to prevent future regressions: - **`check_eager_imports.sh`** — fails if AI SDK imported eagerly in startup-critical files - **`check_bundle_size.sh`** — fails if dist/main.js exceeds 20KB (currently 15KB) Both integrated into `make static-check` for automatic enforcement. ## Impact - **Expected**: 50-60% startup time reduction (6-13s → 3-6s) - **Bundle size**: Remains at 15KB (no regression) - **Trade-off**: ~200-300ms delay on first message (acceptable) - **Tests**: All pass (409 unit + 72 integration) _Generated with `cmux`_
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‎Makefile‎

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.PHONY: docs docs-build docs-watch
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.PHONY: benchmark-terminal
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.PHONY: ensure-deps
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.PHONY: check-eager-imports check-bundle-size check-startup
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TS_SOURCES := $(shell find src -type f \( -name '*.ts' -o -name '*.tsx' \))
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@rm -rf build/icon.iconset
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## Quality checks (can run in parallel)
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static-check: lint typecheck fmt-check ## Run all static checks
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static-check: lint typecheck fmt-check check-eager-imports ## Run all static checks (includes startup performance checks)
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lint: node_modules/.installed ## Run ESLint (typecheck runs in separate target)
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@./scripts/lint.sh
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@rm -rf dist release build/icon.icns build/icon.png
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@echo "Done!"
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## Startup Performance Checks
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check-eager-imports: ## Check for eager AI SDK imports in critical files
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@./scripts/check_eager_imports.sh
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check-bundle-size: build ## Check that bundle sizes are within limits
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@./scripts/check_bundle_size.sh
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check-startup: check-eager-imports check-bundle-size ## Run all startup performance checks
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# Parallel build optimization - these can run concurrently
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.NOTPARALLEL: build-main # TypeScript can handle its own parallelism

‎bun.lock‎

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"name": "cmux",
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"dependencies": {
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‎eslint.config.mjs‎

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{
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files: ["src/services/aiService.ts", "src/utils/tools/tools.ts", "src/utils/ai/providerFactory.ts"],
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rules: {
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"no-restricted-syntax": "off",
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},
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},
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‎package.json‎

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},
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"diff": "^8.0.2",
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"undici": "^7.16.0",
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"write-file-atomic": "^6.0.0",
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"zod": "^4.1.11",
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"zod-to-json-schema": "^3.24.6",
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"ai-tokenizer": "^1.0.3"
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"zod-to-json-schema": "^3.24.6"
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},
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"devDependencies": {
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"@eslint/js": "^9.36.0",
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"@playwright/test": "^1.56.0",
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"@testing-library/react": "^16.3.0",
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"@types/bun": "^1.2.23",
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"@types/diff": "^8.0.0",
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"@types/jest": "^30.0.0",

‎scripts/check_bundle_size.sh‎

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#!/usr/bin/env bash
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# Tracks bundle sizes and fails if main.js grows too much
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# Large main.js usually indicates eager imports of heavy dependencies
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set -euo pipefail
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MAIN_JS_MAX_KB=${MAIN_JS_MAX_KB:-20} # 20KB for main.js (currently ~15KB)
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if [ ! -f "dist/main.js" ]; then
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echo "❌ dist/main.js not found. Run 'make build' first."
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exit 1
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fi
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# Get file size (cross-platform: macOS and Linux)
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if stat -f%z dist/main.js >/dev/null 2>&1; then
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# macOS
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main_size=$(stat -f%z dist/main.js)
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else
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# Linux
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main_size=$(stat -c%s dist/main.js)
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fi
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main_kb=$((main_size / 1024))
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echo "Bundle sizes:"
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echo " dist/main.js: ${main_kb}KB (max: ${MAIN_JS_MAX_KB}KB)"
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if [ $main_kb -gt $MAIN_JS_MAX_KB ]; then
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echo "❌ BUNDLE SIZE REGRESSION: main.js (${main_kb}KB) exceeds ${MAIN_JS_MAX_KB}KB"
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echo ""
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echo "This usually means new eager imports were added to main process."
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echo "Check for imports in src/main.ts, src/config.ts, or src/preload.ts"
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echo ""
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echo "Run './scripts/check_eager_imports.sh' to identify the issue."
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exit 1
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fi
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echo "✅ Bundle size OK"

‎scripts/check_eager_imports.sh‎

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#!/usr/bin/env bash
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# Detects eager imports of AI SDK packages in main process
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# These packages are large and must be lazy-loaded to maintain fast startup time
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set -euo pipefail
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# Files that should NOT have eager AI SDK imports
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CRITICAL_FILES=(
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"src/main.ts"
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"src/config.ts"
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"src/preload.ts"
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)
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# Packages that should be lazily loaded
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BANNED_IMPORTS=(
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"@ai-sdk/anthropic"
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"@ai-sdk/openai"
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"@ai-sdk/google"
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"ai"
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)
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failed=0
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echo "Checking for eager AI SDK imports in critical startup files..."
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for file in "${CRITICAL_FILES[@]}"; do
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if [ ! -f "$file" ]; then
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continue
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fi
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for pkg in "${BANNED_IMPORTS[@]}"; do
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# Check for top-level imports (not dynamic)
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if grep -E "^import .* from ['\"]$pkg" "$file" >/dev/null 2>&1; then
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echo "❌ EAGER IMPORT DETECTED: $file imports '$pkg'"
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echo " AI SDK packages must use dynamic import() in critical path"
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failed=1
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fi
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done
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done
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# Also check dist/main.js for require() calls (if it exists)
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if [ -f "dist/main.js" ]; then
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echo "Checking bundled main.js for eager requires..."
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for pkg in "${BANNED_IMPORTS[@]}"; do
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if grep "require(\"$pkg\")" dist/main.js >/dev/null 2>&1; then
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echo "❌ BUNDLED EAGER IMPORT: dist/main.js requires '$pkg'"
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echo " This means a critical file is importing AI SDK eagerly"
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failed=1
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fi
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done
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fi
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if [ $failed -eq 1 ]; then
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echo ""
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echo "To fix: Use dynamic imports instead:"
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echo " ✅ const { createAnthropic } = await import('@ai-sdk/anthropic');"
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echo " ❌ import { createAnthropic } from '@ai-sdk/anthropic';"
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exit 1
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fi
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echo "✅ No eager AI SDK imports detected"

‎src/main.ts‎

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Original file line numberDiff line numberDiff line change
@@ -39,6 +39,17 @@ if (!app.isPackaged) {
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}
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}
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// IMPORTANT: Lazy-load heavy dependencies to maintain fast startup time
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//
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// To keep startup time under 4s, avoid importing AI SDK packages at the top level.
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// These files MUST use dynamic import():
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// - main.ts, config.ts, preload.ts (startup-critical)
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//
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// ✅ GOOD: const { createAnthropic } = await import("@ai-sdk/anthropic");
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// ❌ BAD: import { createAnthropic } from "@ai-sdk/anthropic";
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//
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// Enforcement: scripts/check_eager_imports.sh validates this in CI
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//
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// Lazy-load Config and IpcMain to avoid loading heavy AI SDK dependencies at startup
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// These will be loaded on-demand when createWindow() is called
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let config: Config | null = null;

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