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one

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One is a React framework for web, iOS, and Android apps.

github.com/onejs/one

onejs/one

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{"version":3,"file":"diagnoseRouteLoadFailure.js","names":[],"sources":["esm/router/diagnoseRouteLoadFailure.js"],"sourcesContent":["const MAX_MODULES = 500;\nconst TIMEOUT_MS = 5e3;\nfunction collectImports(source, base) {\n const out = [];\n const add = (spec) => {\n if (!/^[./]|^https?:/.test(spec)) return;\n try {\n out.push(new URL(spec, base).href);\n } catch {\n }\n };\n for (const m of source.matchAll(\n /(?:^|[\\s;}])(?:import|export)[^'\"]{0,300}?from\\s*[\"']([^\"']+)[\"']/g\n ))\n add(m[1]);\n for (const m of source.matchAll(/\\bimport\\s*\\(\\s*[\"']([^\"']+)[\"']\\s*\\)/g)) add(m[1]);\n for (const m of source.matchAll(/(?:^|[\\s;}])import\\s*[\"']([^\"']+)[\"']/g)) add(m[1]);\n return out;\n}\nasync function findRouteLoadFault(entryUrl) {\n const deadline = Date.now() + TIMEOUT_MS;\n const importers = /* @__PURE__ */ new Map();\n const entry = new URL(entryUrl, window.location.href).href;\n importers.set(entry, null);\n let frontier = [entry];\n let visited = 0;\n while (frontier.length && visited < MAX_MODULES && Date.now() < deadline) {\n const batch = frontier.slice(0, 32);\n frontier = frontier.slice(batch.length);\n visited += batch.length;\n const results = await Promise.all(\n batch.map(async (url) => {\n let res;\n try {\n res = await fetch(url);\n } catch {\n return { url, fault: \"unreachable\", imports: [] };\n }\n if (res.status === 404) return { url, fault: \"missing\", imports: [] };\n if (!res.ok) return { url, fault: null, imports: [] };\n const type = res.headers.get(\"content-type\") ?? \"\";\n if (!type.includes(\"javascript\")) return { url, fault: null, imports: [] };\n return { url, fault: null, imports: collectImports(await res.text(), url) };\n })\n );\n for (const result of results) {\n if (result.fault === \"missing\") {\n const importer = importers.get(result.url) ?? null;\n if (importer?.includes(\"/node_modules/\")) continue;\n return { kind: \"missing\", url: result.url, importer };\n }\n if (result.fault === \"unreachable\") {\n const serverAnswers = await fetch(window.location.href, { method: \"HEAD\" }).then(\n () => true,\n () => false\n );\n return serverAnswers ? { kind: \"blocked\", url: result.url } : null;\n }\n for (const next of result.imports) {\n if (importers.has(next)) continue;\n importers.set(next, result.url);\n frontier.push(next);\n }\n }\n }\n return null;\n}\nasync function diagnoseRouteLoadFailure(routeId, routeUrl) {\n const fault = await findRouteLoadFault(routeUrl);\n if (!fault) return null;\n const toPath = (url) => url.replace(window.location.origin, \"\");\n const path = toPath(fault.url);\n if (fault.kind === \"missing\") {\n return [\n `Route \"${routeId}\" failed to load because ${path} does not exist (the dev server answered 404).`,\n ``,\n fault.importer ? `${toPath(fault.importer)} imports it. Create the file or remove the import.` : `Create the file or remove the import.`\n ].join(\"\\n\");\n }\n return [\n `Route \"${routeId}\" failed to load because this browser refused to fetch ${path}`,\n ``,\n `That request never reached the dev server, so a content blocker or privacy`,\n `extension is blocking it. 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