Registry / devops / rollup-plugin-fable

rollup-plugin-fable

library2.0.0jsnpmunverified

Rollup plugin for Fable, the F# to JavaScript compiler. Current version 2.0.0 enables bundling F# projects with Rollup by invoking the Fable compiler during the build process. Maintained as part of the Fable ecosystem, it integrates with Babel for transpilation and supports options like custom compiler directives, typed arrays, and Fable plugins. Key differentiators: seamless integration with F# tooling, supports Fable's compile-time metaprogramming, and requires careful path resolution to avoid conflicts with NuGet cache.

devops web-framework

npm install rollup-plugin-fable

github ↗package ↗

INSTALL

IMPORT

SIG · ROLLUP-PLUGIN-FABL

rollup-plugin-fable

devopsjavascriptv2.0.0

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 18–223 runs

build_error

glibc

node 18–223 runs

build_error

Code

Verified usage

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

default

✓ import fable from 'rollup-plugin-fable'

✗ const fable = require('rollup-plugin-fable')

This package is ESM-only and does not support CommonJS require().

default

✓ import fable from 'rollup-plugin-fable'

✗ import { fable } from 'rollup-plugin-fable'

The default export is the plugin function; named exports are not available.

default

✓ const fable = (await import('rollup-plugin-fable')).default

✗ const fable = require('rollup-plugin-fable')

For CommonJS require, use dynamic import or upgrade to ESM.

Configures Rollup to bundle an F# project using Fable, with Babel for transpilation and node-resolve for module resolution.

import path from 'path'; import fableUtils from 'fable-utils'; import fable from 'rollup-plugin-fable'; import nodeResolve from 'rollup-plugin-node-resolve'; function resolve(relativePath) { return path.join(__dirname, relativePath); } var babelOptions = fableUtils.resolveBabelOptions({ 'presets': [ ['es2015', {'modules': false}] ] }); export default { entry: resolve('./my-app.fsproj'), dest: resolve('./dist/bundle.js'), plugins: [ fable({ babel: babelOptions }), nodeResolve({ customResolveOptions: { moduleDirectory: resolve('./node_modules') } }) ], format: 'cjs' };

Debug

Known issues

gotchaPath resolution: Must use absolute paths for entry and node_modules to avoid conflicts with Fable pulling files from NuGet cache.

fix

Use path.join(__dirname, relativePath) for all file paths.

affects: >=0.0.0

gotchaBabel options must be resolved via fableUtils.resolveBabelOptions to share the same instance across plugins.

fix

Use fableUtils.resolveBabelOptions() to create babel options object.

affects: >=0.0.0

gotchaDefineConstants property in .fsproj is ignored; use the 'define' option instead.

fix

Pass array of compiler directives via define option, e.g., fable({ define: ['DEBUG'] }).

affects: >=0.0.0

gotchaRequires @babel/core as a peer dependency. Missing it causes runtime errors.

fix

Install @babel/core: npm install --save-dev @babel/core

affects: >=0.0.0

Errors

Common errors & fixes

Error: Cannot find module '@babel/core'

Missing peer dependency @babel/core.

fix

npm install --save-dev @babel/core

Error: Plugin returned an object which has a function but not a generateBundle property

Incorrect usage of the plugin in rollup.config.js (e.g., calling fable() incorrectly).

fix

Ensure fable is invoked as a function in the plugins array, e.g., plugins: [fable({ babel: babelOptions })]

Error: Cannot resolve module 'fable-utils'

Missing dependency fable-utils.

fix

npm install --save-dev fable-utils

TypeError: fableUtils.resolveBabelOptions is not a function

Incorrect import or version of fable-utils.

fix

Ensure fable-utils is installed and imported correctly: import fableUtils from 'fable-utils'

Upgrade

Version history

2.0.0latest on npm

Audit

Dependencies

@babel/corerequiredRequired peer dependency for Babel transpilation of compiled JS

Agent activity

8 hits · last 30 days

node

Resources

githubhttps://github.com/fable-compiler/Fable ↗

packagehttps://www.npmjs.com/package/rollup-plugin-fable ↗