/**
* Metro bundler readiness detection
*/
export interface MetroStatus {
ready: boolean;
url?: string;
port?: number;
}
// Patterns to detect Metro readiness from output
const METRO_READY_PATTERNS = [
/Metro waiting on (exp:\/\/[\w\d.:-]+)/,
/Metro waiting on (http:\/\/[\w\d.:-]+)/,
/Bundler URL: (https?:\/\/[\w\d.:-]+)/,
/Running on (https?:\/\/[\w\d.:-]+)/,
/Dev server listening on (https?:\/\/[\w\d.:-]+)/,
/›.*Press.*to open/i, // Expo CLI ready indicator
];
const METRO_ERROR_PATTERNS = [
/error:/i,
/failed to start/i,
/EADDRINUSE/,
/Unable to start server/i,
];
export function detectMetroReady(output: string): MetroStatus {
// Check for errors first
for (const pattern of METRO_ERROR_PATTERNS) {
if (pattern.test(output)) {
return { ready: false };
}
}
// Look for ready patterns
for (const pattern of METRO_READY_PATTERNS) {
const match = output.match(pattern);
if (match) {
const url = match[1];
const portMatch = url?.match(/:(\d+)/);
return {
ready: true,
url,
port: portMatch ? parseInt(portMatch[1], 10) : undefined,
};
}
}
// Also check for the simple ready indicator
if (output.includes("Welcome to Expo") || output.includes("Starting Metro")) {
// Metro is starting but not yet ready
return { ready: false };
}
// Check if logs show bundling complete
if (output.includes("Bundle complete") || output.includes("Ready")) {
return { ready: true };
}
return { ready: false };
}
export function extractMetroUrl(output: string): string | null {
const status = detectMetroReady(output);
return status.url ?? null;
}
export function isMetroError(output: string): boolean {
for (const pattern of METRO_ERROR_PATTERNS) {
if (pattern.test(output)) {
return true;
}
}
return false;
}
export function extractBundleProgress(output: string): number | null {
// Look for bundling progress indicators
const progressMatch = output.match(/(\d+)%/);
if (progressMatch) {
return parseInt(progressMatch[1], 10);
}
return null;
}
