Registry / devops / esbuild-plugin-babel-flow

esbuild-plugin-babel-flow

library0.0.5jsnpmunverified

An esbuild plugin for stripping Flow type annotations from JavaScript files using Babel under the hood. Current version is 0.0.5, released as an early-stage package. It integrates into the esbuild plugin system via the 'onLoad' event, transforming code with Babel's transform API to remove Flow types for safe execution. Key differentiators: it bridges esbuild's lack of native Flow support by leveraging Babel's flow-strip-types preset. Alternative plugins exist (e.g., esbuild-plugin-flow), but this one explicitly uses Babel for compatibility. Note that peer dependency esbuild ^0.14.23 is required.

devops serialization

npm install esbuild-plugin-babel-flow

package ↗

INSTALL

IMPORT

SIG · ESBUILD-PLUGIN-BAB

esbuild-plugin-babel-flow

devopsjavascriptv0.0.5

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.

babelFlowPlugin

✓ import { babelFlowPlugin } from 'esbuild-plugin-babel-flow'

✗ import babelFlowPlugin from 'esbuild-plugin-babel-flow'

The package uses a named export, not a default export. CommonJS require works: const { babelFlowPlugin } = require('esbuild-plugin-babel-flow')

default

✓ There is no default export.

✗ import plugin from 'esbuild-plugin-babel-flow'

Attempting a default import will result in undefined.

babelFlowPlugin (type)

✓ import type { babelFlowPlugin } from 'esbuild-plugin-babel-flow'

✗ import { babelFlowPlugin } from 'esbuild-plugin-babel-flow' (if only type)

TypeScript type import is safe; the package does not ship its own types, but you can declare or use Babel types.

Demonstrates setting up esbuild with the Flow-stripping plugin, bundling a file with Flow type annotations.

import { build } from 'esbuild'; import { babelFlowPlugin } from 'esbuild-plugin-babel-flow'; build({ entryPoints: ['example.flow.js'], bundle: true, outdir: 'dist', plugins: [babelFlowPlugin()], }).catch(() => process.exit(1)); // Ensure package.json has "type": "module" or use .mjs extension

Debug

Known issues

gotchaPlugin does not perform type checking; it only strips types. Use Flow separately for type validation.

fix

Run flow check before or after bundling.

affects: >=0.0.0

gotchaesbuild peer dependency must be ^0.14.23. Using other versions may cause incompatibility.

fix

Ensure esbuild version meets requirement.

affects: >=0.0.0

gotchaThe plugin applies Babel transformation to all loaded JS files, which may slow down builds for large codebases.

fix

Use esbuild's filter option to only apply plugin to files containing Flow annotations.

affects: >=0.0.0

breakingNo breaking changes documented as package is very early (v0.0.5). API subject to change.

fix

Pin version and monitor releases.

affects: >=0.0.0

Errors

Common errors & fixes

Error: Cannot find module 'esbuild-plugin-babel-flow'

Package not installed or not in node_modules.

fix

Run npm install esbuild-plugin-babel-flow --save-dev

TypeError: esbuild.build is not a function

Incorrect esbuild import; common mistake importing default from esbuild.

fix

Use import { build } from 'esbuild'

ReferenceError: require is not defined in ES module scope

Using CommonJS require in an ES module package.json with "type": "module".

fix

Use import { babelFlowPlugin } from 'esbuild-plugin-babel-flow'

Upgrade

Version history

0.0.5latest on npm

Audit

Dependencies

esbuildrequiredPeer dependency; plugin runs in esbuild's build process.

Agent activity

2 hits · last 30 days

node

Resources

packagehttps://www.npmjs.com/package/esbuild-plugin-babel-flow ↗