template.statements breaks TypeScript namespaces

[thorn0]

AST Explorer

Input

interface Foo { foo: string; }
interface Bar { bar: string; }

Transformation

export default function transformer(file, api) {
  const j = api.jscodeshift.withParser('ts');

  return j(file.source)
    .find('Program')
    .replaceWith( p => j.template.statement`namespace Z { ${p.node.body} }`)
    .toSource();
}

Output

namespace Z interface Foo { foo: string; }
interface Bar { bar: string; }

Expected

namespace Z {
  interface Foo { foo: string; }
  interface Bar { bar: string; }
}

[fkling]

Mmh. Have to look into whether there is an issue inserting arrays into placeholders or whether it's in upstream printing issue in recast.

[thorn0]

If I delete end of the created TSModuleDeclaration, then it works as expected.