[Bug]: Template parser fails on syntactic placeholder for TS namespace name

[kbjr]

💻

• [ ] Would you like to work on a fix?

How are you using Babel?

Programmatic API (babel.transform, babel.parse)

Input code

const b = require('@babel/core');
const t = require('@babel/template');

const template = t.smart('export namespace %%foo%% { }', {
  plugins: ['typescript'],
  syntacticPlaceholders: true,
});

template({
  foo: b.types.identifier('bar'),
});

Configuration file name

No response

Configuration

No response

Current and expected behavior

The above code throws an error:

Uncaught [SyntaxError: Missing semicolon. (2:24)
  1 | /* @babel/template */;
> 2 | export namespace %%foo%% { }
    |                        ^
    =============
] {
  code: 'BABEL_TEMPLATE_PARSE_ERROR',
  reasonCode: 'MissingSemicolon',
  loc: Position { line: 2, column: 24, index: 47 },
  pos: 47,
  syntaxPlugin: undefined
}

It should not throw an error, it should successfully replace the placeholder with the given identifier and return an AST.

Environment

System:

• OS: Linux 5.15 Ubuntu 22.04.4 LTS 22.04.4 LTS (Jammy Jellyfish) [Windows 11 + WSL2]

Binaries:

• Node: 20.13.0 - ~/.nvm/versions/node/v20.13.0/bin/node
• npm: 10.8.1 - ~/.nvm/versions/node/v20.13.0/bin/npm

npmPackages:

• @babel/core: ^7.25.2 => 7.25.2
• @babel/generator: ^7.25.6 => 7.25.6
• @babel/parser: ^7.25.6 => 7.25.6
• @babel/plugin-syntax-import-attributes: ^7.25.6 => 7.25.6
• @babel/plugin-syntax-typescript: ^7.25.4 => 7.25.4
• @babel/template: ^7.25.0 => 7.25.0
• @babel/traverse: ^7.25.6 => 7.25.6
• @babel/types: ^7.25.6 => 7.25.6
• babel-plugin-istanbul: ^7.0.0 => 7.0.0

Possible solution

No response

Additional context

No response

[babel-bot]

Hey @kbjr! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

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