refactor(src): split oversized modules

scripts/check-ts-max-loc.ts

@@ -0,0 +1,74 @@
+import { existsSync } from "node:fs";
+import { readFile } from "node:fs/promises";
+import { execFileSync } from "node:child_process";
+
+type ParsedArgs = {
+  maxLines: number;
+};
+
+function parseArgs(argv: string[]): ParsedArgs {
+  let maxLines = 500;
+
+  for (let index = 0; index < argv.length; index++) {
+    const arg = argv[index];
+    if (arg === "--max") {
+      const next = argv[index + 1];
+      if (!next || Number.isNaN(Number(next))) throw new Error("Missing/invalid --max value");
+      maxLines = Number(next);
+      index++;
+      continue;
+    }
+  }
+
+  return { maxLines };
+}
+
+function gitLsFilesAll(): string[] {
+  // Include untracked files too so local refactors don’t “pass” by accident.
+  const stdout = execFileSync("git", ["ls-files", "--cached", "--others", "--exclude-standard"], {
+    encoding: "utf8",
+  });
+  return stdout
+    .split("\n")
+    .map((line) => line.trim())
+    .filter(Boolean);
+}
+
+async function countLines(filePath: string): Promise<number> {
+  const content = await readFile(filePath, "utf8");
+  // Count physical lines. Keeps the rule simple + predictable.
+  return content.split("\n").length;
+}
+
+async function main() {
+  // Makes `... | head` safe.
+  process.stdout.on("error", (error: NodeJS.ErrnoException) => {
+    if (error.code === "EPIPE") process.exit(0);
+    throw error;
+  });
+
+  const { maxLines } = parseArgs(process.argv.slice(2));
+  const files = gitLsFilesAll()
+    .filter((filePath) => existsSync(filePath))
+    .filter((filePath) => filePath.endsWith(".ts") || filePath.endsWith(".tsx"));
+
+  const results = await Promise.all(
+    files.map(async (filePath) => ({ filePath, lines: await countLines(filePath) })),
+  );
+
+  const offenders = results
+    .filter((result) => result.lines > maxLines)
+    .sort((a, b) => b.lines - a.lines);
+
+  if (!offenders.length) return;
+
+  // Minimal, grep-friendly output.
+  for (const offender of offenders) {
+    // eslint-disable-next-line no-console
+    console.log(`${offender.lines}\t${offender.filePath}`);
+  }
+
+  process.exitCode = 1;
+}
+
+await main();