esprima-fb

library15001.1001.0-dev-harmony-fbjsnpmunverified

A Facebook-specific fork of the Esprima JavaScript parser, version 15001.1001.0-dev-harmony-fb, that adds full support for JSX syntax extensions on top of ECMAScript 5.1 and experimental ES6/Harmony features. Unlike standard Esprima, this fork enables parsing JSX as used by React and JSXDOM. It maintains compatibility with Mozilla Parser AST format and includes syntax location tracking. Its versioning scheme maps to upstream Esprima harmony branches with Facebook modifications. No longer actively maintained; replaced by modern parsers like Babel.

serialization data

npm install esprima-fb

github ↗package ↗

INSTALL

IMPORT

SIG · ESPRIMA-FB

esprima-fb

serializationjavascriptv15001.1001.0-dev-harmony-fb

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

parse

✓ import { parse } from 'esprima-fb';

✗ const esprima = require('esprima-fb'); esprima.parse(code);

ESM import is preferred; CommonJS require works but returns the module object.

tokenize

✓ import { tokenize } from 'esprima-fb';

✗ const tokenize = require('esprima-fb').tokenize;

tokenize is a named export; using .property on require is also valid but less idiomatic.

Syntax

✓ import { Syntax } from 'esprima-fb';

✗ import Syntax from 'esprima-fb';

Syntax is an object with node type constants; default import is incorrect.

Parses JSX code into an AST using esprima-fb with location tracking.

import { parse } from 'esprima-fb'; const code = `const element = <div className="foo">Hello</div>;`; const ast = parse(code, { jsx: true, loc: true }); console.log(JSON.stringify(ast, null, 2));

Debug

Known issues

deprecatedEsprima-FB is no longer maintained; use Babel parser or acorn-jsx instead.

fix

Migrate to @babel/parser or acorn with acorn-jsx plugin.

affects: *

breakingJSX parsing in esprima-fb requires explicitly setting { jsx: true } option; not default.

fix

Always pass { jsx: true } to parse() when parsing JSX code.

affects: *

breakingThe AST format may differ from official ESTree spec; incompatible with some tools.

fix

Use a modern parser that follows the latest ESTree specification.

affects: *

Errors

Common errors & fixes

SyntaxError: Unexpected token <

JSX parsing not enabled; missing { jsx: true } option.

fix

Add { jsx: true } as second argument to parse().

Cannot find module 'esprima-fb'

Package not installed or removed from npm.

fix

Install the package: npm install esprima-fb --save

Upgrade

Version history

15001.1001.0-dev-harmony-fblatest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/facebook/esprima ↗

packagehttps://www.npmjs.com/package/esprima-fb ↗