@babel/preset-flow
Advanced tools
The @babel/preset-flow npm package is a Babel preset for transforming Flow syntax. Flow is a static type checker for JavaScript, and this preset allows developers to strip Flow types from their source code to make it compatible with standard JavaScript environments. This is useful for projects that use Flow for type checking but need to remove the type annotations for production builds.
Type Annotations Stripping
This code sample shows a class with Flow type annotations. The @babel/preset-flow will remove the ': number' type annotations when transforming the code.
class MyClass {
size: number;
constructor(size: number) {
this.size = size;
}
}Interface Stripping
This code sample defines a Flow interface. The @babel/preset-flow will remove the entire interface declaration when transforming the code.
interface Serializable {
serialize(): string;
}Type Alias Removal
This code sample shows a Flow type alias. The @babel/preset-flow will remove the type alias when transforming the code.
type Point = {
x: number,
y: number
};Similar to @babel/preset-flow, this package is used to strip TypeScript types from the source code to convert it into plain JavaScript. It serves a similar purpose for TypeScript as @babel/preset-flow does for Flow.
This package is a lightweight alternative to Babel for removing Flow type annotations from files. It is faster and simpler but does not offer the extensive plugin system and transformations that Babel provides.
Babel preset for all Flow plugins.
See our website @babel/preset-flow for more information or the issues associated with this package.
Using npm:
npm install --save-dev @babel/preset-flow
or using yarn:
yarn add @babel/preset-flow --dev
v7.25.9 (2024-10-22)
babel-parser, babel-template, babel-types
syntacticPlaceholders mode (@liuxingbaoyu)babel-helper-compilation-targets, babel-preset-env
ClassAccessorProperty to prevent the no-undef rule (@victorenator)babel-parser, babel-types
VISITOR_KEYS etc. faster to access (@liuxingbaoyu)FAQs
Babel preset for all Flow plugins.
The npm package @babel/preset-flow receives a total of 5,557,107 weekly downloads. As such, @babel/preset-flow popularity was classified as popular.
We found that @babel/preset-flow demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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