Trailing trivia removed for some object properties

[RussKie]

TypeScript Version: 1.8.x / Playground

Code

// the export annotations
export function bug() {
    // hello

    // another?

    // return annotation
    return {
        // return object annotation
        outer: {
            // more!
            inner1: { // here too
                // and more

                p1: 'v1', // comment1
                p2: 'v2', // comment2
                p3: 'v3'  // last comment
            } // here?
        } // and here?
    }; // here too?

    // and finally here
}

Playground demo

Expected behavior:
All comments preserved

Actual behavior:
comment1 and comment2 are removed

[yuit]

@RussKie is there a particular reason the comments (// comment1 and // comment2 ) have to be at that particular locations?

Unfortunately, with current comment emit system, there is no way to retrieve them back see for extra information (https://github.com/Microsoft/TypeScript-wiki/pull/140/files#diff-e6f81a9d8df4fb4d787121a242ea6bf1R1336)

[RussKie]

Yes, absolutely there is a reason :)

Imagine a large existing JS codebase which is slowly getting converted to TS. There may be an enum which properties are added over time across different versions:

// jshint ignore: start
export = Common_Constants_Module();

function Common_Constants_Module() {

    var Constants = {
        TOPIC: {
            FROM_CONTAINER: {
                MESSAGE1: "message1",
                MESSAGE2: "message2",       // added in 1.0.1
                MESSAGE3: "message3",       // added in 2.0.0
                MESSAGE4: "message4",       // added in 2.0.0
            },
        },

        TRANSPORT: {
            NONE: "none",                                     // -1
            PAGEBUS: "pagebus",                               // 0
            NATIVE_IFRAME: "native_iframe",                   // 1
            NATIVE_OBJECT: "native_object",                   // 2
            NATIVE_POST_MESSAGE: "native_post_message",       // 3
        },

    };
    return Constants;
}

// jshint ignore:end

Thank you for the link, it is insightful.
The loss of comments is still a regression.