import { existsSync } from "node:fs";
import { join, dirname, resolve } from "node:path";
const RESULTSET_FILE = ".resultset.json";
const COVERAGE_DIR = "coverage";
export function discoverCoverageDir(): string {
const envPath = process.env.SIMPLECOV_COVERAGE_PATH;
if (envPath) {
const resolved = resolve(envPath);
if (existsSync(join(resolved, RESULTSET_FILE))) {
return resolved;
}
throw new Error(
`SIMPLECOV_COVERAGE_PATH="${envPath}" に ${RESULTSET_FILE} が見つかりません`
);
}
let dir = process.cwd();
while (true) {
const candidate = join(dir, COVERAGE_DIR);
if (existsSync(join(candidate, RESULTSET_FILE))) {
return candidate;
}
const parent = dirname(dir);
if (parent === dir) break;
dir = parent;
}
throw new Error(
`coverage ディレクトリが見つかりません。cwd (${process.cwd()}) から親方向に探索しましたが、${COVERAGE_DIR}/${RESULTSET_FILE} が存在しませんでした。環境変数 SIMPLECOV_COVERAGE_PATH で明示指定することもできます。`
);
}
