By default, import and export declarations can only appear at a program's top level. Setting this option to true allows them anywhere where a statement is allowed.
By default, a return statement at the top level raises an error. Set this to true to accept such code.
By default, exported identifiers must refer to a declared variable. Set this to true to allow export statements to reference undeclared variables.
By default, the parser adds information about parentheses by setting
extra.parenthesized to true as needed.
When this option is true the parser creates ParenthesizedExpression
AST nodes instead of using the extra property.
A pattern to search for when looking for Identifier and StringLiteral nodes that should be considered placeholders. false will
disable placeholder searching entirely, leaving only the placeholderWhitelist value to find placeholders.
A set of placeholder names to automatically accept. Items in this list do not need to match the given placeholder pattern.
Array containing the plugins that you want to enable.
Set this to true to preserve any comments from the code parameter.
Adds a ranges property to each node: [node.start, node.end]
Correlate output AST nodes with their source filename. Useful when generating code and source maps from the ASTs of multiple input files.
Indicate the mode the code should be parsed in. Can be one of "script", "module", or "unambiguous". Defaults to "script". "unambiguous" will make @babel/parser attempt to guess, based on the presence of ES6 import or export statements. Files with ES6 imports and exports are considered "module" and are otherwise "script".
By default, the first line of code parsed is treated as line 1. You can provide a line number to alternatively start with. Useful for integration with other source tools.
Should the parser work in strict mode. Defaults to true if sourceType === 'module'. Otherwise, false.
Adds all parsed tokens to a tokens property on the File node.
By default, await use is not allowed outside of an async function. Set this to true to accept such code.