Function assertInDir

packages/fresh/src/utils.ts:5–17

(
  filePath: string,
  dir: string,
)

import { pathToFileUrl, relativeUrl } from "./file_url.ts";

export function assertInDir(
  filePath: string,
  dir: string,
): void {
  let tmp = filePath;
  if (!path.isAbsolute(tmp)) {
    tmp = path.join(dir, filePath);
  }

  if (path.relative(dir, tmp).startsWith(".")) {
    throw new Error(`Path "${tmp}" resolved outside of "${dir}"`);
  }
}

/**
 * Converts a file path to a valid JS export name.