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Babylon is a JavaScript parser used in Babel.
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.
babylon.parse(code, [options])
allowImportExportEverywhere: 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.
allowReturnOutsideFunction: By default, a return statement at
the top level raises an error. Set this to true
to 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.
Babylon generates AST according to Babel AST format. It is based on ESTree spec with the following deviations:
directives
field with Directive and DirectiveLiteralAST for JSX code is based on Facebook JSX AST with the addition of one node type:
JSXText
require("babylon").parse("code", {
// parse in strict mode and allow module declarations
sourceType: "module",
plugins: [
// enable jsx and flow syntax
"jsx",
"flow"
]
});
jsx
flow
classConstructorCall
doExpressions
objectRestSpread
decorators
classProperties
exportExtensions
asyncGenerators
functionBind
functionSent
6.9.1 (2016-08-23)
This release contains mainly small bugfixes but also updates babylons default mode to es2017. The features for exponentiationOperator
, asyncFunctions
and trailingFunctionCommas
which previously needed to be activated via plugin are now enabled by default and the plugins are now no-ops.
FAQs
A JavaScript parser
The npm package babylon receives a total of 2,904,752 weekly downloads. As such, babylon popularity was classified as popular.
We found that babylon demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 5 open source maintainers collaborating on the project.
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