Add the github-linguist package

This commit only adds a single package and all of its transitive
dependencies. The github-linguist package will be used for counting
lines of code as a baseline for databases we are analyzing.

node_modules/github-linguist/src/index.ts

@@ -0,0 +1,29 @@
+// @ts-ignore
+import slash from 'slash2';
+import fs from 'fs-extra';
+
+import { LocDir, LocResult } from './directory';
+import { LocFile } from './file';
+
+export { LocDir, LocDirOptions } from './directory';
+export { LocFile, LineInfo } from './file';
+
+const loc = async (
+  fileOrDir: string,
+): Promise<LocResult> => {
+  const stat = await fs.stat(slash(fileOrDir));
+  if (stat.isFile()) {
+    const locFile = new LocFile(slash(fileOrDir));
+    const info = await locFile.getFileInfo();
+    const filePath = locFile.path;
+    return {
+      info: info.lines,
+      files: [filePath],
+      languages: { [info.languages]: { ...info.lines, sum: 1 } },
+    };
+  }
+  const locDir = new LocDir({ cwd: slash(fileOrDir) });
+  return locDir.loadInfo();
+};
+
+export default loc;