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50 lines
2.2 KiB
Markdown
50 lines
2.2 KiB
Markdown
# The flow-parser package
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This package contains the Flow parser in its compiled-to-JavaScript form.
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# What is Flow
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See [flow.org](https://flow.org/). The code for the Flow parser [lives on GitHub](https://github.com/facebook/flow/tree/master/src/parser).
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# What is the Flow Parser
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The Flow Parser is a JavaScript parser written in OCaml. It produces an AST that conforms to the [ESTree spec](https://github.com/estree/estree) and that mostly matches what [esprima](http://esprima.org/) produces. The Flow Parser can be compiled to native code or can be compiled to JavaScript using [js_of_ocaml](http://ocsigen.org/js_of_ocaml/). This npm package contains the Flow parser compiled to JavaScript.
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# Usage
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You can use the Flow parser in your browser or in node. To use in node you can just do
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```JavaScript
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require('flow-parser').parse('1+1', {});
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```
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To use in the browser, you can add
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```HTML
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<script src="flow_parser.js"></script>
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```
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which will make the `flow` object available to use like so:
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```JavaScript
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flow.parse('1+1', {});
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```
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## Options
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The second argument to `flow.parse` is the options object. Currently supported options:
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### Basic options
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* `types` (boolean, default `true`) - enable parsing of Flow types
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* `use_strict` (boolean, default `false`) - treat the file as strict, without needing a "use strict" directive
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* `comments` (boolean, default `true`) - attach comments to AST nodes (`leadingComments` and `trailingComments`)
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* `all_comments` (boolean, default `true`) - include a list of all comments from the whole program
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* `tokens` (boolean, default `false`) - include a list of all parsed tokens in a top-level `tokens` property
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### Language features
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* `enums` (boolean, default `false`) - enable parsing of [enums](https://flow.org/en/docs/enums/)
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* `match` (boolean, default `false`) - enable parsing of [match expressions and match statements](https://flow.org/en/docs/match/)
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* `components` (boolean, default `false`) - enable parsing of [component syntax](https://flow.org/en/docs/react/component-syntax/)
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* `assert_operator` (boolean, default `false`) - enable parsing of the assert operator
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* `esproposal_decorators` (boolean, default `false`) - enable parsing of decorators
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