fix: handle multiple node_modules folders determining mainFilename for ESM (#2123)

jopemachine · jly36963 · Benjamin E. Coe · web-flow · commit e0823dd7e6ce · 2022-05-14T22:00:55.000Z
Co-authored-by: Landon Yarrington &lt;33426811+jly36963@users.noreply.github.com&gt;
Co-authored-by: Benjamin E. Coe &lt;bencoe@google.com&gt;
diff --git a/lib/platform-shims/esm.mjs b/lib/platform-shims/esm.mjs
@@ -21,7 +21,7 @@ try {
 } catch (e) {
   __dirname = process.cwd();
 }
-const mainFilename = __dirname.split('node_modules')[0]
+const mainFilename = __dirname.substring(0, __dirname.lastIndexOf('node_modules'));
 
 export default {
   assert: {

Original file line number	Diff line number	Diff line change
`@@ -21,7 +21,7 @@ try {`
`21`	`21`	`} catch (e) {`
`22`	`22`	`__dirname = process.cwd();`
`23`	`23`	`}`
`24`		`-const mainFilename = __dirname.split('node_modules')[0]`
	`24`	`+const mainFilename = __dirname.substring(0, __dirname.lastIndexOf('node_modules'));`
`25`	`25`
`26`	`26`	`export default {`
`27`	`27`	`assert: {`