d15a2310cd
The fix includes creating a new method on the parser called `parseArrow`. This new function by default only checks if current position matches an arrow. If it does returns the `node` otherwise `undefined`. The flow plugin can then extend this function and correctly parse the typeAnnotation and add it to the node. With this change, in the flow plugin there is no need anymore to extend `parseParenAndDistinguishExpression` and the arrow handling in `parseParenItem` could also be removed, because it is all handled now in `parseArrow`. Some existing tests were failing, because `extra->parentesized` is now missing, but this is correct as it is now inline with parsing without flow annotation. No extra is added for arrow function without type annotations. In the expression-parser `this.next()` was replaced by a more specific `this.expect(tt.parenL)`.
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.
Example
require("babylon").parse("code", {
// parse in strict mode and allow module declarations
sourceType: "module",
plugins: [
// enable experimental async functions
"asyncFunctions",
// enable jsx and flow syntax
"jsx",
"flow"
]
});
Plugins
jsxflowasyncFunctionsclassConstructorCalldoExpressionstrailingFunctionCommasobjectRestSpreaddecoratorsclassPropertiesexportExtensionsexponentiationOperatorasyncGeneratorsfunctionBindfunctionSent