Need help with babel-plugin-flow-react-proptypes?
Click the “chat” button below for chat support from the developer who created it, or find similar developers for support.

About the developer

434 Stars 48 Forks MIT License 448 Commits 30 Opened issues


A babel plugin to generate React PropTypes definitions from Flow type declarations.

Services available


Need anything else?

Contributors list

A babel plugin to generate React PropTypes definitions from Flow type declarations.

build status Coverage Status npm version npm downloads Dependency Status


With this input:

var React = require('react');

export type Qux = {baz: 'literal'};

import type SomeExternalType from './types';

type FooProps = { an_optional_string?: string, a_number: number, a_boolean: boolean, a_generic_object: Object, array_of_strings: Array, instance_of_Bar: Bar, anything: any, mixed: mixed, one_of: 'QUACK' | 'BARK' | 5, one_of_type: number | string, nested_object_level_1: { string_property_1: string, nested_object_level_2: { nested_object_level_3: { string_property_3: string, }, string_property_2: string, } }, should_error_if_provided: void, intersection: {foo: string} & { bar: number } & Qux, some_external_type: SomeExternalType, some_external_type_intersection: {foo: string} & SomeExternalType, }

export default class Foo extends React.Component { props: FooProps }}

The output will be:

var React = require('react');

var babelPluginFlowReactPropTypes_proptype_Qux = { baz: bpfrp_PropTypes.oneOf(['literal']).isRequired };

export default class Foo extends React.Component {} Foo.propTypes = { an_optional_string: bpfrp_PropTypes.string, a_number: bpfrp_PropTypes.number.isRequired, a_boolean: bpfrp_PropTypes.bool.isRequired, a_generic_object: bpfrp_PropTypes.object.isRequired, array_of_strings: bpfrp_PropTypes.arrayOf(bpfrp_PropTypes.string.isRequired).isRequired, instance_of_Bar: function () { return (typeof Bar === 'function' ? bpfrp_PropTypes.instanceOf(Bar).isRequired : bpfrp_PropTypes.any.isRequired).apply(this, arguments); }, anything: (props, propName, componentName) => { if (!, propName)) { throw new Error(Prop \${propName}` has type 'any' or 'mixed', but was not provided to `${componentName}`. Pass undefined or any other value.); } }, mixed: (props, propName, componentName) => { if (!, propName)) { throw new Error(Prop `${propName}` has type 'any' or 'mixed', but was not provided to `${componentName}`. Pass undefined or any other value.); } }, one_of: bpfrp_PropTypes.oneOf(['QUACK', 'BARK', 5]).isRequired, one_of_type: bpfrp_PropTypes.oneOfType([bpfrp_PropTypes.number, bpfrp_PropTypes.string]).isRequired, nested_object_level_1: bpfrp_PropTypes.shape({ string_property_1: bpfrp_PropTypes.string.isRequired, nested_object_level_2: bpfrp_PropTypes.shape({ nested_object_level_3: bpfrp_PropTypes.shape({ string_property_3: bpfrp_PropTypes.string.isRequired }).isRequired, string_property_2: bpfrp_PropTypes.string.isRequired }).isRequired }).isRequired, should_error_if_provided: (props, propName, componentName) => { if (props[propName] != null) { throw new Error(Invalid prop `${propName}` of value `${props[propName]}` passed to `${componentName}`. Expected undefined or null.`); } }, intersection: bpfrp_PropTypes.shape({ foo: bpfrp_PropTypes.string.isRequired, bar: bpfrp_PropTypes.number.isRequired, baz: bpfrp_PropTypes.oneOf(['literal']).isRequired }).isRequired, some_external_type: function () { return (typeof bpfrp_babelPluginFlowReactPropTypes_proptype_SomeExternalType === 'function' ? bpfrp_babelPluginFlowReactPropTypes_proptype_SomeExternalType.isRequired ? bpfrp_babelPluginFlowReactPropTypes_proptype_SomeExternalType.isRequired : bpfrp_babelPluginFlowReactPropTypes_proptype_SomeExternalType : bpfrp_PropTypes.shape(bpfrp_babelPluginFlowReactPropTypes_proptype_SomeExternalType).isRequired).apply(this, arguments); }, some_external_type_intersection: bpfrp_PropTypes.shape(Object.assign({}, { foo: bpfrp_PropTypes.string.isRequired }, bpfrp_babelPluginFlowReactPropTypes_proptype_SomeExternalType === bpfrp_PropTypes.any ? {} : bpfrp_babelPluginFlowReactPropTypes_proptype_SomeExternalType)).isRequired }; import bpfrp_PropTypes from 'prop-types'; export { babelPluginFlowReactPropTypes_proptype_Qux }; import { bpfrp_babelPluginFlowReactPropTypes_proptype_SomeExternalType } from './types';


Starting in 14.0.0, we output ES6 import/export statements by default. The

option (explained below) will cause it to use common.js modules instead.

In version 25.0.0 and onward, we only support babel 7. Install version 24.x.x if you're using babel 6.

The reaason for the high major versions is that any change to the prop type output, including adding new checks that previously produced no output, impact users of this plugin. Check the changelog to see what's changed at each version.


This plugin searches for a React components using type declaration. Works with functional components and ES6 classes.

is not currently supported.


First install the plugin:

npm install --save-dev babel-plugin-flow-react-proptypes

Also install the prop-types package. This is required for React

. For earlier React versions you can use version
of this plugin, which doesn't use the prop-types package.
npm install --save prop-types

Then add it to your babelrc:

  "presets": ["..."],
  "plugins": ["flow-react-proptypes"]

To save some bytes in production, you can also only enable it in development mode.

  "presets": ["..."],
  "env": {
    "development": {
      "plugins": ["flow-react-proptypes"]



option (disabled by default) adds a predicate to the code allowing both your propTypes definitions and potentially the entire 'prop-types' package to be excluded in certain builds. Unlike specifying this plugin in the development env, mentioned above, this also works for packages published to npm.
  "plugins": [["flow-react-proptypes", { "deadCode": true }]]

The value of

is short for
process.env.NODE_ENV === 'production'
. You can alternatively pass any JavaScript expression. If the expression returns a truthy value, then the propTypes will be removed. This works because e.g. webpack will subsitute the value of
, resulting in the condition being
'production' === 'production'
, and then a minifer sees that the code we're generating can't be executed, and strips it, and the
code out of the final bundle.

Note: In dead code mode, we use

instead of ES6 modules.

Example of specifying a custom expression:

  "plugins": [["flow-react-proptypes", { "deadCode": "__PROD__" }]]



option forces this plugin to output ES6 modules, even if the
option is enabled. Your bundler will be responsible for removing the dead code.


This plugin isn't perfect. You can disable it for an entire file with this directive (including quotes):

'no babel-plugin-flow-react-proptypes';

Specifically for react-native you can disable this for files in

with the
config option.
  "presets": ["..."],
  "plugins": [["flow-react-proptypes", { "ignoreNodeModules": true }]]

If you already have other plugins in plugins section. It is important to place

before the following plugins:
  • transform-class-properties
  • transform-flow-strip-types

If you're using the 'react' or 'flow' presets, you don't need to do anything special.

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.