Wordfence issue with bundle-1012.js.map

After today’s update to Version 1.0.13, Wordfence reported “Modified plugin file: wp-content/plugins/wp-migrate-db/asset/build/js/bundle-1012.js.map”. Not an unusual issue but I tried to repair it and it would not repair. Then I brought up bundle-1012.js.map in notepad++. It looks a bit strange. Two questions: 1) is it a legitimate file? 2) is it necessary or can it be deleted?

Example of code:
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