有没有办法为整个包/lib/文件夹设置`//@dart=2.12`？

Question

When migrating large code bases to nnbd, it would be helpful if we could opt entire local packages in/out of NNBD. For example, I may want to migrate some of my leaf nodes first, like /lib/helper_widgets/* before moving onto the higher-order views.

Currently dart supports this on a per file basis using // @dart=2.12 which is fairly tedious if your package has many files.

I was hoping I could do this with lib and part of , but this just gives me a compile error, to add a header to each file.

[Edit] A pragmatic solution here is to run something like find. -name "*.dart" | xargs sed -i "1s/^/\/\/ @dart=2.9\n/" find. -name "*.dart" | xargs sed -i "1s/^/\/\/ @dart=2.9\n/" find. -name "*.dart" | xargs sed -i "1s/^/\/\/ @dart=2.9\n/" on your project. That will put the 2.9 import in every file. At that pt, you can use find/replace to just turn on entire sub-directories of your /lib code.

Answer 1

It's gonna be either per file, or with the pubspec.yaml . The pubspec method will change the entire package. If you use dart migrate , that's one of the steps it performs. Then be sure to dart pub upgrade , because a different set of dependencies will then be available.