Method findInExtensions

packages/webpack-cli/src/webpack-cli.ts:2780–2805

(
      resolvedBase: string,
      basename: string,
      entries: Set<string> | null,
      extensions: string[],
    )

    };

    const findInExtensions = async (
      resolvedBase: string,
      basename: string,
      entries: Set<string> | null,
      extensions: string[],
    ): Promise<string | undefined> => {
      for (const ext of extensions) {
        // Skip candidates absent from the listing, but when the directory can't be listed (`entries` is `null`) probe every candidate directly.
        if (entries && !entries.has((basename + ext).toLowerCase())) {
          continue;
        }

        const candidate = resolvedBase + ext;

        // Confirm with `access` to preserve exact existence semantics (e.g.
        // broken symlinks are listed by `readdir` but fail `access`).
        try {
          await fs.promises.access(candidate, fs.constants.F_OK);
          return candidate;
        } catch {
          // Listed but not accessible, keep looking
        }
      }

      return undefined;
    };

    // Order defines the priority, in decreasing order. Within each filename,
    // common extensions take priority over the exotic ones (matching the