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One major benefit of trailing commas is that they play well with version control.

E.g. let's say you have the following array:

const myArray = [
    1,
    2,
];

Later, you like to add an additional element:

const myArray = [
    1,
    2,
    3,
];

Then, the diff file looks as follows:

 const myArray = [
     1,
     2,
+    3,
 ];

And not:

 const myArray = [
     1,
-    2
+    2,
+    3
 ];

Which IMHO is much less descriptive.