feat: add support for pnpm workspace (#1027)

* Add pnpm workspace support

* Update comments

* chore: correct filename for pnpm lockfile

* chore: correct filename for pnpm lockfile

---------

Co-authored-by: David Sanders <dsanders11@ucsbalum.com>

src/search-module.ts

@@ -69,12 +69,12 @@ export async function searchForNodeModules(cwd: string, rootPath?: string): Prom
 
 /**
  * Determine the root directory of a given project, by looking for a directory with an
- * NPM or yarn lockfile.
+ * NPM or yarn lockfile or pnpm lockfile.
  *
  * @param cwd the initial directory to traverse
  */
 export async function getProjectRootPath(cwd: string): Promise<string> {
-  for (const lockFilename of ['yarn.lock', 'package-lock.json']) {
+  for (const lockFilename of ['yarn.lock', 'package-lock.json', 'pnpm-lock.yaml']) {
     const pathGenerator: PathGeneratorFunction = (traversedPath) => path.join(traversedPath, lockFilename);
     const lockPaths = await traverseAncestorDirectories(cwd, pathGenerator, undefined, 1)
     if (lockPaths.length > 0) {

test/search-module.ts

@@ -18,7 +18,7 @@ async function removeTempDir(): Promise<void> {
 describe('search-module', () => {
   describe('getProjectRootPath', () => {
     describe('multi-level workspace', () => {
-      for (const lockFile of ['yarn.lock', 'package-lock.json']) {
+      for (const lockFile of ['yarn.lock', 'package-lock.json', 'pnpm-lock.yaml']) {
         describe(lockFile, () => {
           before(async () => {
             await createTempDir();