esmangle

library1.0.1jsnpmunverified

ESMangle is an ECMAScript code mangler/minifier that operates on Mozilla Parser API AST. Version 1.0.1 (final release, 2012) is stable but deprecated; no new releases in over a decade, superseded by tools like UglifyJS and Terser. It provides functions `mangle`, `optimize`, and CLI command `esmangle`. Key differentiator: AST-based mangling using a resolution algorithm derived from bytecode compiler iv/lv5/railgun. Requires complementary AST tools `esprima` (parse) and `escodegen` (generate). Not maintained; security and compatibility risks.

devops

npm install esmangle

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INSTALL

IMPORT

SIG · ESMANGLE

esmangle

devopsjavascriptv1.0.1

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.

mangle

✓ import { mangle } from 'esmangle'

✗ const mangle = require('esmangle').mangle

ESM-style import works with bundlers supporting named exports from CJS modules.

optimize

✓ import { optimize } from 'esmangle'

✗ const optimize = require('esmangle/optimize')

Common destructuring or named import preferred; no subpath exports.

default import (entire module)

✓ import esmangle from 'esmangle'

✗ const esmangle = require('esmangle')

Default import works if using a bundler that assigns `module.exports` object; Node require also works.

Parses code with esprima, runs esmangle optimize and mangle, then generates minified output with escodegen.

import { parse } from 'esprima'; import { mangle, optimize } from 'esmangle'; import { generate } from 'escodegen'; const code = 'function add(a, b) { return a + b; }'; const ast = parse(code); const optimized = optimize(ast, null); const mangled = mangle(optimized); const result = generate(mangled, { format: { renumber: true, hexadecimal: true, escapeless: true, compact: true, semicolons: false, parentheses: false } }); console.log(result); // Example output: 'function add(a,b){return a+b}' but with mangled names like n,o

Debug

Known issues

deprecatedesmangle is unmaintained since 2012 and superseded by Terser and UglifyJS.

fix

Migrate to Terser or UglifyJS for modern JavaScript minification.

affects: >=0.1.0

gotchaesmangle only mangles AST; it does not parse or generate code. Requires esprima and escodegen as separate dependencies.

fix

Install esprima and escodegen alongside esmangle.

affects: >=1.0.0

gotchaESM imports may fail in strict Node.js ESM environments as esmangle is a CJS-only package without named export mapping.

fix

Use require('esmangle') or a bundler that interops CJS exports.

affects: >=1.0.0

Errors

Common errors & fixes

Cannot find module 'esprima'

esmangle requires esprima to parse code but does not list it as a dependency.

fix

npm install esprima

Cannot find module 'escodegen'

esmangle requires escodegen to generate code but does not list it as a dependency.

fix

npm install escodegen

esmangle.mangle is not a function

Incorrect import path or missing export; esmangle exports mangle as named export.

fix

Use const { mangle } = require('esmangle'); or import { mangle } from 'esmangle';

Upgrade

Version history

1.0.1latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

4 hits · last 30 days

node

Resources

githubhttp://github.com/Constellation/esmangle ↗

packageesmangle ↗

homepagehttp://github.com/Constellation/esmangle.html ↗