When uglifying with the grunt plugin, using option output.comments: 'some' or output.comments: /^!/, only comments from the first file(s) are being preserved. This problem doesn't happen when using uglify-js package.
You can try both in this demo: https://www.dropbox.com/sh/n6mn6szkdgqmsyo/AAD9hydCLM76hGMMkIdCW6Mua?dl=0
Try npm run build to test using uglify-js. This preserves comments containing @license and @preserve from all three files.
Try grunt build to test using grunt plugin. This only preserves comment from the first file (1.js) for me.
When uglifying with the grunt plugin, using option
output.comments: 'some'oroutput.comments: /^!/, only comments from the first file(s) are being preserved. This problem doesn't happen when using uglify-js package.You can try both in this demo: https://www.dropbox.com/sh/n6mn6szkdgqmsyo/AAD9hydCLM76hGMMkIdCW6Mua?dl=0
Try
npm run buildto test using uglify-js. This preserves comments containing@licenseand@preservefrom all three files.Try
grunt buildto test using grunt plugin. This only preserves comment from the first file (1.js) for me.