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Process string messages for translation from modules that use react-intl, specifically:

  • Parse and verify that messages are ICU-compliant w/o any syntax issues.
  • Remove description from message descriptor to save bytes since it isn't used at runtime.
  • Option to remove defaultMessage from message descriptor to save bytes since it isn't used at runtime.
  • Automatically inject message ID based on specific pattern.


npm i babel-plugin-formatjs


This Babel plugin only visits ES6 modules which import React Intl.

The default message descriptors for the app's default language will be processed from: defineMessages(), defineMessage(), intl.formatMessage and <FormattedMessage>; all of which are named exports of the React Intl package.


"plugins": [
"idInterpolationPattern": "[sha512:contenthash:base64:6]",
"ast": true

Via Node API

The extract message descriptors are available via the metadata property on the object returned from Babel's transform() API:

require('@babel/core').transform('code', {
plugins: ['formatjs'],
}) // => { code, map, ast, metadata['formatjs'].messages, metadata['formatjs'].meta };



A function with the signature (id: string, defaultMessage: string, description: string|object) => string which allows you to override the ID both in the extracted javascript and messages.


If certain message descriptors don't have id, this pattern will be used to automaticallygenerate IDs for them. Default to [sha512:contenthash:base64:6]. See nodejs crypto createHash for hash algorithms & nodejs buffer docs for digest encodings.


Remove defaultMessage field in generated js after extraction.


Additional component names to extract messages from, e.g: ['FormattedFooBarMessage']. NOTE: By default we check for the fact that FormattedMessage are imported from moduleSourceName to make sure variable alias works. This option does not do that so it's less safe.


Additional function names to extract messages from, e.g: ['$formatMessage']. Use this if you prefer to alias formatMessage to something shorter like $t.


parse specific additional custom pragma. This allows you to tag certain file with metadata such as project. For example with this file:

// @intl-meta project:my-custom-project
import {FormattedMessage} from 'react-intl'
;<FormattedMessage defaultMessage="foo" id="bar" />

and with option {pragma: "@intl-meta"}, we'll parse out // @intl-meta project:my-custom-project into {project: 'my-custom-project'} in the result file.


Pre-parse defaultMessage into AST for faster runtime perf. This flag doesn't do anything when removeDefaultMessage is true.