27ad69d43f
This makes declare class extends behave the same way as in flow The ast-token after the extends keyword, might be either Identifier or QualifiedTypeIdentifier To do that this commits splits the parseGenericType into two functions, one for parsing genericType and on for qualifiedTypeIdentifier
Babylon is a JavaScript parser used in Babel.
- ES6 enabled by default.
- Comment attachment.
- Support for JSX and Flow.
- Support for experimental language proposals.
Credits
Heavily based on acorn and acorn-jsx, thanks to the awesome work of @RReverser and @marijnh.
Significant diversions are expected to occur in the future such as streaming, EBNF definitions, sweet.js integration, interspacial parsing and more.
API
babylon.parse(code, [options])
Options
-
allowImportExportEverywhere: By default,
importandexportdeclarations can only appear at a program's top level. Setting this option totrueallows them anywhere where a statement is allowed. -
allowReturnOutsideFunction: By default, a return statement at the top level raises an error. Set this to
trueto accept such code. -
allowSuperOutsideMethod TODO
-
sourceType: Indicate the mode the code should be parsed in. Can be either
"script"or"module". -
sourceFilename: Correlate output AST nodes with their source filename. Useful when generating code and source maps from the ASTs of multiple input files.
-
plugins: Array containing the plugins that you want to enable.
Output
Babylon generates AST according to Babel AST format. It is based on ESTree spec with the following deviations:
- Literal token is replaced with StringLiteral, NumericLiteral, BooleanLiteral, NullLiteral, RegExpLiteral
- Property token is replaced with ObjectProperty and ObjectMethod
- MethodDefinition is replaced with ClassMethod
- Program and BlockStatement contain additional
directivesfield with Directive and DirectiveLiteral - ClassMethod, ObjectProperty, and ObjectMethod value property's properties in FunctionExpression is coerced/brought into the main method node.
AST for JSX code is based on Facebook JSX AST with the addition of one node type:
JSXText
Example
require("babylon").parse("code", {
// parse in strict mode and allow module declarations
sourceType: "module",
plugins: [
// enable jsx and flow syntax
"jsx",
"flow"
]
});
Plugins
jsxflowclassConstructorCalldoExpressionsobjectRestSpreaddecoratorsclassPropertiesexportExtensionsasyncGeneratorsfunctionBindfunctionSent