Electron app development patterns for thin wrapper apps around dev servers. Use when: (1) Building Electron apps as thin wrappers around web apps, (2) Managing dev server processes in Electron, (3) Handling nodenv/anyenv PATH issues in spawned processes, (4) Packaging with electron-builder, (5) Sharing modules across multiple Electron apps (extraResources), (6) Dynamic project root resolution in packaged apps, (7) Opening external links in default browser.
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Electron app development patterns for thin wrapper apps around dev servers. Use when: (1) Building Electron apps as thin wrappers around web apps, (2) Managing dev server processes in Electron, (3) Handling nodenv/anyenv PATH issues in spawned processes, (4) Packaging with electron-builder, (5) Sharing modules across multiple Electron apps (extraResources), (6) Dynamic project root resolution in packaged apps, (7) Opening external links in default browser.
Electron Development
Common Pattern: Thin Wrapper App
Electron as thin wrapper around a dev server (e.g., Vite, Docusaurus):
electron-builder: Keep as devDependency (DO NOT use pnpm dlx)
electron-builder has 300+ sub-dependencies. Using pnpm dlx downloads them all on every invocation, making builds extremely slow. Always install it as a devDependency:
Shared Modules: Use extraResources, NOT files glob
// WRONG - shared module won't be in the asar"files":["main.js","../../../shared/module/**/*"]// CORRECT - copies to app's Resources directory"extraResources":[{"from":"../../../shared/module","to":"module"}]
Walk up from app.getPath("exe") checking each directory for package.json with the expected project name. This is robust against repo moves and directory restructuring — no fragile .. counting.
functionfindProjectRootFromExePath() {
let dir = path.dirname(app.getPath("exe"));
const root = path.parse(dir).root;
while (dir !== root) {
if (isProjectRoot(dir)) return dir;
dir = path.dirname(dir);
}
returnnull;
}
Open External Links in Default Browser (Cmd+Click)
Electron doesn't open links in the system browser by default. Use setWindowOpenHandler to intercept Cmd+click and route external URLs to the default browser via shell.openExternal. See BrowserWindow Setup above.
Validate URL protocol (allow only http: and https:) to prevent javascript: or other protocol injection.
Dev Server: Kill Stale Port Before Start
When the app crashes or is force-quit, the old dev server process may survive and hold the port. On next launch the new server can't bind, causing a timeout. Kill any existing process on the port before spawning:
const { execSync } = require("child_process");
functionkillProcessOnPort(port) {
try {
const output = execSync(`lsof -ti tcp:${port}`, { encoding: "utf-8" });
const pids = output.trim().split("\n").filter(Boolean);
for (const pid of pids) {
process.kill(Number(pid), "SIGKILL");
}
} catch {
// No process on port - fine
}
}
Dev Server: Health Check Must Not Require HTTP 200
When the dev server framework uses a non-root baseUrl (e.g., Docusaurus with baseUrl: "/pj/app/doc/"), the root path / returns 404. Accept any HTTP response as proof the server is alive:
// WRONG - breaks when baseUrl is not "/"
(res) => resolve(res.statusCode === 200)
// CORRECT - any response means server is up
(res) => resolve(res.statusCode > 0)
Dev Server: Default URL Must Include baseUrl
When the framework uses a non-root baseUrl, the default URL must include the full path. Otherwise the app opens to a 404 page:
// WRONG - opens to 404 when baseUrl is "/pj/app/doc/"const defaultUrl = "http://localhost:3000";
// CORRECT - include the full baseUrl pathconst defaultUrl = "http://localhost:3000/pj/app/doc/";
Dev Server: Avoid Transient Errors During File Regeneration
When regenerating files that a running dev server watches, write new files before deleting stale ones. If you delete first, the dev server sees missing files and shows errors.
