💻
How are you using Babel?
Programmatic API (babel.transform, babel.parse)
Input code
const {parse} = require('@babel/parser'),
generate = require('@babel/generator').default;
const ast = parse('(class /*foo*/ extends X {})');
console.log(generate(node).code);Configuration file name
No response
Configuration
n/a
Current and expected behavior
Would expect generate() to output code identical to the input, preserving the /*foo*/ comment.
Actual output is '(class extends X {})'. The comment is omitted.
AST returned by parse() does include the comment. ast.program.body[0].expression.innerComments[0] equals {type: 'CommentBlock', value: 'foo'}. It's generate() which ignores it.
Environment
System:
OS: macOS 10.15.7
Binaries:
Node: 16.8.0 - ~/.nvm/versions/node/v16.8.0/bin/node
npm: 7.21.0 - ~/.nvm/versions/node/v16.8.0/bin/npm
npmPackages:
@babel/core: ^7.15.5 => 7.15.5
@babel/generator: ^7.15.4 => 7.15.4
@babel/helper-module-transforms: ^7.15.7 => 7.15.7
@babel/helper-plugin-utils: ^7.14.5 => 7.14.5
@babel/parser: ^7.15.7 => 7.15.7
@babel/plugin-transform-arrow-functions: ^7.14.5 => 7.14.5
@babel/plugin-transform-modules-commonjs: ^7.15.4 => 7.15.4
@babel/plugin-transform-react-jsx: ^7.14.9 => 7.14.9
@babel/plugin-transform-strict-mode: ^7.14.5 => 7.14.5
@babel/register: ^7.15.3 => 7.15.3
@babel/traverse: ^7.15.4 => 7.15.4
@babel/types: ^7.15.6 => 7.15.6
babel-jest: ^27.2.2 => 27.2.2
babel-plugin-dynamic-import-node: ^2.3.3 => 2.3.3
eslint: ^7.32.0 => 7.32.0
jest: ^27.2.2 => 27.2.2
Possible solution
No response
Additional context
No response
💻
How are you using Babel?
Programmatic API (
babel.transform,babel.parse)Input code
Configuration file name
No response
Configuration
n/a
Current and expected behavior
Would expect
generate()to output code identical to the input, preserving the/*foo*/comment.Actual output is
'(class extends X {})'. The comment is omitted.AST returned by
parse()does include the comment.ast.program.body[0].expression.innerComments[0]equals{type: 'CommentBlock', value: 'foo'}. It'sgenerate()which ignores it.Environment
Possible solution
No response
Additional context
No response