The flow-parser package

This package contains the Flow parser in its compiled-to-JavaScript form.

What is Flow

See flow.org. The code for the Flow parser lives on GitHub.

What is the Flow Parser

The Flow Parser is a JavaScript parser written in OCaml. It produces an AST that conforms to the ESTree spec and that mostly matches what esprima produces. The Flow Parser can be compiled to native code or can be compiled to JavaScript using js_of_ocaml. This npm package contains the Flow parser compiled to JavaScript.

Usage

You can use the Flow parser in your browser or in node. To use in node you can just do

require('flow-parser').parse('1+1', {});

To use in the browser, you can add

<script src="flow_parser.js"></script>

which will make the flow object available to use like so:

flow.parse('1+1', {});

Options

The second argument to flow.parse is the options object. Currently supported options:

Basic options

types (boolean, default true) - enable parsing of Flow types
use_strict (boolean, default false) - treat the file as strict, without needing a "use strict" directive
comments (boolean, default true) - attach comments to AST nodes (leadingComments and trailingComments)
all_comments (boolean, default true) - include a list of all comments from the whole program
tokens (boolean, default false) - include a list of all parsed tokens in a top-level tokens property

Language features

enums (boolean, default false) - enable parsing of enums
match (boolean, default false) - enable parsing of match expressions and match statements
components (boolean, default false) - enable parsing of component syntax
assert_operator (boolean, default false) - enable parsing of the assert operator
esproposal_decorators (boolean, default false) - enable parsing of decorators

Current Tags

0.309.0 ... latest (3 days ago)

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