Package Exports

seafox

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Readme

Seafox

A blazing fast 100% spec compliant, self-hosted javascript parser written in Typescript.

Features

Conforms to the standard ECMAScript® 2020 (ECMA-262 10th Edition) language specification
Support for additional ECMAScript features for Web Browsers
Optionally track syntactic node locations
Emits an ESTree-compatible abstract syntax tree.
No backtracking
Low memory usage
Very well tested (~40 000 unit tests with full code coverage)
Lightweight - ~88 KB minified

Installation

npm install seafox --save-dev

API

Seafox generates AST according to ESTree AST format, and can be used to perform syntactic analysis (parsing) of a JavaScript program, and with ES2015 and later a JavaScript program can be either a script or a module.

Seafox stricly follows the ECMA specifications so you have to specify whether to parse in parseScript mode (the default) or in parseModule mode.

This is the available options:

{
  // The flag to enable start and end offsets and line/column location information to each node
  loc: false;

  // Disable web compability
  disableWebCompat: false;

  // The flag to attach raw property to each literal and identifier node
  raw: false;

  // Enabled directives
  directives: false;

  // The flag to allow return in the global scope
  globalReturn: false;

  // The flag to enable implied strict mode
  impliedStrict: false;

// Enable non-standard parenthesized expression node
  preserveParens: false;
}