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babylon

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  • License MIT

A JavaScript parser

Package Exports

  • babylon
  • babylon/lib/index
  • babylon/lib/parser
  • babylon/lib/parser/index
  • babylon/lib/tokenizer
  • babylon/lib/tokenizer/state
  • babylon/lib/tokenizer/types
  • babylon/lib/util/identifier
  • babylon/lib/util/whitespace
  • babylon/package.json

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (babylon) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

babylon

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, 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".

  • 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

  • jsx
  • flow
  • asyncFunctions
  • classConstructorCall
  • doExpressions
  • trailingFunctionCommas
  • objectRestSpread
  • decorators
  • classProperties
  • exportExtensions
  • exponentiationOperator
  • asyncGenerators
  • functionBind
  • functionSent