Comments on PropertyDeclaration nodes not honored by the TS transform.

[alxhub]

TypeScript Version: 2.7.2

Search Terms: PropertyDeclaration

Code

function addComment(property: ts.PropertyDeclaration): void {
  ts.addSyntheticLeadingComment(property, ts.SyntaxKind.MultiLevelCommentTrivia, 'this comment will never show up');
}

Expected behavior:

The comment appears in the generated JS file.

Actual behavior:

The comment is missing from the generated JS file.

Playground Link: n/a

Related Issues:

More Info:

The comment is dropped in the ts.ts transform function addInitializedPropertyStatements. As part of transforming the PropertyDeclaration nodes into Statements, their comments are forgotten:

https://github.com/Microsoft/TypeScript/blob/master/src/compiler/transformers/ts.ts#L1219

[j-oliveras]

Duplicate of #17689 and #22377.

Probably solved by #22141. You can try it with a nightly build.

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.