TypeError: Cannot read properties of undefined (reading 'startLine')

[jameshearttech]

I'm getting a type error formatting 1 particular file. Any ideas?

[jtkiesel]

Can you provide the Java file that you experience this error with?

[jameshearttech]

I probably cannot share it. It's from a private repository for work. I spent some time trying to figure out what is causing the error on my own, but this file is 4.5k lines so going through it by hand to look at every comment takes some time.

Can you tell anything from the prettier output? If I cannot share the file, can you give me guidance on how to determine what is causing the problem?

[jameshearttech]

I confirmed I cannot share the file. How can I tell where in the file the exception occurred?

[jameshearttech]

@jtkiesel I created a launch in VS Code for pnpm exec prettier --check ... and set a breakpoint at prettier-plugin-java/dist/printers/comments/handle-comments.js line 84. I debugged prettier and found that binaryOperator is undefined when the exception occurs.

I found the line in the file that is being formatted from the breakpoint, too. The line has a comment at the end. I moved the comment to its own line and the problem went away.

I made a quick example. When I remove //comment1 then prettier is able to format the file.

public class Example {
    public static void main(String[] args) {
        Foo bar
        = !baz //comment1
        || bat //comment2
        ? null //comment3
        : bam //comment4
        ;
    }
}