Structured output (json?) would be best for editor with a section of content that should be displayed to the user in the editor console. Perhaps a --format=json option for this that editor could use to notify pub of the format it needs.

Perhaps a --format=json option

Yup, that's what I was thinking too.

Marked this as blocking #15829.

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Set owner to @munificent.
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Bob,

Right now pub build always puts the generated files in "build" directory. So would this change the behavior and users can now specify out folder?

This bug is a bit murky, but there's two things in here:

1. Having pub build print the path to the build directory.
2. Have an option to make all of pub build's output be JSON.
3. An option to specify a build directory.

This bug really only asks for the first two. Specifying an output directory is useful too, but that would be a separate bug.

Changed the title to: "Pub build should support output that can be consumed by the Editor".

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You can pass in "--format json" to pub build now, and it will output a single JSON object to stdout.

Jumped the gun a bit. Out for code review: https://codereview.chromium.org/184113007

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This issue has been moved to dart-lang/pub#714.