Registry / babel-plugin-transform-es2015-block-scoped-functions

babel-plugin-transform-es2015-block-scoped-functions

library6.22.0jsnpmunverified

Babel plugin (v6.22.0) that transforms function declarations inside blocks to be block-scoped, ensuring compatibility with ES2015 semantics in older environments. This plugin is part of Babel's deprecated 'es2015' preset and is no longer maintained independently. It converts block-level function declarations to variable assignments with the same name, preventing hoisting issues. For modern Babel usage (v7+), use @babel/plugin-transform-block-scoped-functions instead.

npm install babel-plugin-transform-es2015-block-scoped-functions

github ↗package ↗

INSTALL

IMPORT

SIG · BABEL-PLUGIN-TRANS

babel-plugin-transform-es2015-block-scoped-functions

javascriptv6.22.0

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

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

plugin (default)

✓ { "plugins": ["transform-es2015-block-scoped-functions"] }

Used in .babelrc or babel.config.js plugin array

plugin (programmatic)

✓ require('babel-core').transform(code, { plugins: ['transform-es2015-block-scoped-functions'] })

✗ import { transform } from 'babel-core'; transform(code, { plugins: ['transform-es2015-block-scoped-functions'] })

This old plugin is CJS-only; cannot use ESM import syntax in older Babel versions

require('babel-plugin-transform-es2015-block-scoped-functions')

✓ const plugin = require('babel-plugin-transform-es2015-block-scoped-functions');

✗ import plugin from 'babel-plugin-transform-es2015-block-scoped-functions';

Package does not provide ESM exports; use require only

Shows how to configure and use the plugin to block-scope function declarations within blocks.

// .babelrc { "plugins": ["transform-es2015-block-scoped-functions"] } // Input function f() { return 1; } { function f() { return 2; } } f(); // now returns 1 instead of 2 in older engines // Output (transformed) function f() { return 1; } { var _f = function f() { return 2; }; } f(); // returns 1 // Via Node API var babel = require('babel-core'); var result = babel.transform('{ function foo() {} }', { plugins: ['transform-es2015-block-scoped-functions'] }); console.log(result.code);

Debug

Known issues

deprecatedThis package is deprecated as of Babel v7. Use @babel/plugin-transform-block-scoped-functions instead.

fix

Replace with @babel/plugin-transform-block-scoped-functions in Babel v7 projects.

affects: >=6.0.0

breakingPlugin renaming: babel-plugin-transform-es2015-block-scoped-functions has been renamed to @babel/plugin-transform-block-scoped-functions in Babel v7.

fix

Use @babel/plugin-transform-block-scoped-functions or include in @babel/preset-env (which automatically includes it when needed).

affects: >=7.0.0

gotchaDoes not work with Babel v7 or later; only compatible with babel-core v6.

fix

Upgrade to @babel/core v7 and use @babel/plugin-transform-block-scoped-functions.

affects: >=7.0.0

gotchaPlugin only applies to function declarations at block level; does not affect arrow functions or function expressions.

fix

No fix needed; understand the scope of the plugin.

affects: >=6.0.0

Errors

Common errors & fixes

Error: Cannot find module 'babel-plugin-transform-es2015-block-scoped-functions'

Package not installed or using wrong Babel version.

fix

npm install babel-plugin-transform-es2015-block-scoped-functions --save-dev (for Babel 6) or use @babel/plugin-transform-block-scoped-functions (for Babel 7+)

Plugin/Preset files are not allowed to export objects, only functions

Using the plugin with Babel v7 which expects @babel/plugin prefix.

fix

Switch to @babel/plugin-transform-block-scoped-functions.

Error: Invalid plugin "transform-es2015-block-scoped-functions" specified in

Typo or wrong configuration format.

fix

Ensure plugin name is correct and in quotes: "transform-es2015-block-scoped-functions"

Upgrade

Version history

6.22.0latest on npm

Audit

Dependencies

babel-corerequiredRequires babel-core to run as a plugin

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/babel/babel ↗

packagehttps://www.npmjs.com/package/babel-plugin-transform-es2015-block-scoped-functions ↗