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author | Florian Dold <florian.dold@gmail.com> | 2016-10-10 03:43:44 +0200 |
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committer | Florian Dold <florian.dold@gmail.com> | 2016-10-10 03:43:44 +0200 |
commit | abd94a7f5a50f43c797a11b53549ae48fff667c3 (patch) | |
tree | ab8ed457f65cdd72e13e0571d2975729428f1551 /node_modules/babylon/README.md | |
parent | a0247c6a3fd6a09a41a7e35a3441324c4dcb58be (diff) |
add node_modules to address #4364
Diffstat (limited to 'node_modules/babylon/README.md')
-rw-r--r-- | node_modules/babylon/README.md | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/node_modules/babylon/README.md b/node_modules/babylon/README.md new file mode 100644 index 000000000..d4dfbc318 --- /dev/null +++ b/node_modules/babylon/README.md @@ -0,0 +1,119 @@ +<p align="center"> + <img alt="babylon" src="https://raw.githubusercontent.com/babel/logo/master/babylon.png" width="700"> +</p> + +<p align="center"> + Babylon is a JavaScript parser used in <a href="https://github.com/babel/babel">Babel</a>. +</p> + +<p align="center"> + <a href="https://travis-ci.org/babel/babylon"><img alt="Travis Status" src="https://img.shields.io/travis/babel/babylon/master.svg?style=flat&label=travis"></a> + <a href="https://codecov.io/gh/babel/babylon"><img alt="Codecov Status" src="https://img.shields.io/codecov/c/github/babel/babylon/master.svg?style=flat"></a> +</p> + + - The latest ECMAScript version enabled by default (ES2017). + - Comment attachment. + - Support for JSX and Flow. + - Support for experimental language proposals. + +## Credits + +Heavily based on [acorn](https://github.com/marijnh/acorn) and [acorn-jsx](https://github.com/RReverser/acorn-jsx), +thanks to the awesome work of [@RReverser](https://github.com/RReverser) and [@marijnh](https://github.com/marijnh). + +Significant diversions are expected to occur in the future such as streaming, EBNF definitions, sweet.js integration, interspatial 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"`. + +- **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 `directives` field 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` + +[Babel AST format]: https://github.com/babel/babylon/blob/master/ast/spec.md +[ESTree spec]: https://github.com/estree/estree + +[Literal]: https://github.com/estree/estree/blob/master/spec.md#literal +[Property]: https://github.com/estree/estree/blob/master/spec.md#property +[MethodDefinition]: https://github.com/estree/estree/blob/master/es6.md#methoddefinition + +[StringLiteral]: https://github.com/babel/babylon/blob/master/ast/spec.md#stringliteral +[NumericLiteral]: https://github.com/babel/babylon/blob/master/ast/spec.md#numericliteral +[BooleanLiteral]: https://github.com/babel/babylon/blob/master/ast/spec.md#booleanliteral +[NullLiteral]: https://github.com/babel/babylon/blob/master/ast/spec.md#nullliteral +[RegExpLiteral]: https://github.com/babel/babylon/blob/master/ast/spec.md#regexpliteral +[ObjectProperty]: https://github.com/babel/babylon/blob/master/ast/spec.md#objectproperty +[ObjectMethod]: https://github.com/babel/babylon/blob/master/ast/spec.md#objectmethod +[ClassMethod]: https://github.com/babel/babylon/blob/master/ast/spec.md#classmethod +[Program]: https://github.com/babel/babylon/blob/master/ast/spec.md#programs +[BlockStatement]: https://github.com/babel/babylon/blob/master/ast/spec.md#blockstatement +[Directive]: https://github.com/babel/babylon/blob/master/ast/spec.md#directive +[DirectiveLiteral]: https://github.com/babel/babylon/blob/master/ast/spec.md#directiveliteral +[FunctionExpression]: https://github.com/babel/babylon/blob/master/ast/spec.md#functionexpression + +[Facebook JSX AST]: https://github.com/facebook/jsx/blob/master/AST.md + +### Semver + +Babylon follows semver in most situations. The only thing to note is that some spec-compliancy bug fixes may be released under patch versions. + +For example: We push a fix to early error on something like [#107](https://github.com/babel/babylon/pull/107) - multiple default exports per file. That would be considered a bug fix even though it would cause a build to fail. + +### Example + +```javascript +require("babylon").parse("code", { + // parse in strict mode and allow module declarations + sourceType: "module", + + plugins: [ + // enable jsx and flow syntax + "jsx", + "flow" + ] +}); +``` + +### Plugins + + - `jsx` + - `flow` + - `doExpressions` + - `objectRestSpread` + - `decorators` + - `classProperties` + - `exportExtensions` + - `asyncGenerators` + - `functionBind` + - `functionSent` |