こやつに苦しめられた話。
Could not read source map for file:///d:/hoge/node_modules/fecha/lib/fecha.umd.js:
ENOENT: no such file or directory, open 'd:\hoge\node_modules\fecha\lib\fecha.umd.js.map'
下記のように.vscode/launch.json内の"type"を"node"から"pwa-node"へ変更したら出なくなりました。詳細分かる人いましたらぜひ共有いただきたいです！！！
launch.json(変更前)
{"version":"0.3.0","configurations":[{"type":"node","request":"launch","name":"MAIN","program":"${workspaceFolder}\\index.js","outputCapture":"std"}]}launch.json(変更後)
{"version":"0.3.0","configurations":[{"type":"pwa-node","request":"launch","name":"MAIN","program":"${workspaceFolder}\\index.js","outputCapture":"std"}]}