Registry / type-stubs / babel-file-loader

babel-file-loader

library2.0.0jsnpmunverified

Load files into memory for parsing and traversal with Babylon/Babel. Version 2.0.0 is the latest stable release, published as part of the babel-multi-file project. It provides async and sync methods to resolve file paths from import declarations and load parsed File objects, enabling multi-file Babel plugin analysis. Key differentiators: integrates directly with Babel's visitor pattern and File representation, offering low-level control over file resolution and parsing.

type-stubs web-framework

npm install babel-file-loader

github ↗package ↗

INSTALL

IMPORT

SIG · BABEL-FILE-LOADER

babel-file-loader

type-stubsjavascriptv2.0.0

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.

loadImportSync

✓ import { loadImportSync } from 'babel-file-loader'

✗ const loadImportSync = require('babel-file-loader').loadImportSync

Package ships ES modules; named exports only, no default export. Use ESM import syntax.

loadFileSync

✓ import { loadFileSync } from 'babel-file-loader'

✗ import loadFileSync from 'babel-file-loader'

Default import is incorrect; all exports are named.

resolveFilePathSync

✓ import { resolveFilePathSync } from 'babel-file-loader'

✗ const { resolveFilePathSync } = require('babel-file-loader')

CommonJS require is not supported in the ESM distribution; use dynamic import or ES module context.

Shows how to use loadImportSync inside a Babel plugin visitor to load and parse the file referenced by an import declaration.

import { loadImportSync } from 'babel-file-loader'; export default function() { return { visitor: { ImportDeclaration(path) { try { const file = loadImportSync(path); console.log('Loaded file:', file.opts.filename); } catch (e) { console.error('Failed to load import:', e.message); } } } }; }

Debug

Known issues

breakingVersion 2.0.0 is a complete rewrite from the previous babel-file-loader package (v1). API changed entirely: sync methods now return objects instead of using callbacks, and all functions are async/sync variants.

fix

Upgrade to v2.0.0 and adapt code to use new sync/async naming (e.g., loadImportSync instead of callback-based loadImport).

affects: ~1.x

gotchaThe package is ESM-only (type: module). Using require() or CommonJS will fail with ERR_REQUIRE_ESM.

fix

Use dynamic import() inside CommonJS, or switch to ES module context. For Babel plugins, ensure your plugin file uses .mjs or "type": "module" in package.json.

affects: >=2.0.0

gotchaloadImportSync may throw if the import path cannot be resolved or parsed; always wrap in try/catch inside visitor functions.

fix

Wrap calls in try/catch blocks to prevent Babel plugin from crashing.

affects: >=2.0.0

deprecatedThe underlying Babylon parser is deprecated in favor of @babel/parser. This package still uses Babylon; may break with newer Babel versions.

fix

Consider using @babel/traverse and @babel/core's programmatic API for multi-file analysis.

affects: >=2.0.0

gotchaAll async functions (e.g., loadImport, loadFile) are not exported as promises; they use callback-style? The docs mention Async/Sync variants but actual async behavior is unclear.

fix

Prefer sync variants (loadImportSync) for use inside Babel visitors; async functions may not work as expected.

affects: 2.0.0

Errors

Common errors & fixes

Error [ERR_REQUIRE_ESM]: require() of ES Module not supported

Using require('babel-file-loader') in a CommonJS context.

fix

Use dynamic import: const { loadImportSync } = await import('babel-file-loader'); or switch your project to ES modules.

SyntaxError: Unexpected token 'export'

Using ES module syntax in a .js file without type:module or .mjs extension.

fix

Rename the file to .mjs or add "type": "module" to your package.json.

TypeError: path.traverse is not a function

Attempting to traverse the path object directly instead of the File object's path property returned by loadImportSync.

fix

Use file.path.traverse({...}) where file is the return value of loadImportSync.

Error: Cannot find module 'babylon'

Missing peer dependency for Babylon parser.

fix

Install babylon: npm install babylon@latest

Upgrade

Version history

2.0.0latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

38 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/thejameskyle/babel-multi-file ↗

packagehttps://www.npmjs.com/package/babel-file-loader ↗