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"use strict";(self.webpackChunkwebsite=self.webpackChunkwebsite||[]).push([[2770],{7811:(e,n,t)=>{t.r(n),t.d(n,{assets:()=>u,contentTitle:()=>c,default:()=>p,frontMatter:()=>o,metadata:()=>i,toc:()=>d});const i=JSON.parse('{"id":"guides/distribute-libraries","title":"Distributing i18n-friendly libraries","description":"In larger scale applications/monorepos, not all components/libraries live within the same repo/project and they might get distributed differently. While there are multiple ways to solve this problem, this guide aims to provide a guidance that we\'ve seen working quite well with large engineering orgs.","source":"@site/docs/guides/distribute-libraries.md","sourceDirName":"guides","slug":"/guides/distribute-libraries","permalink":"/docs/guides/distribute-libraries","draft":false,"unlisted":false,"editUrl":"https://github.com/formatjs/formatjs/edit/main/website/docs/guides/distribute-libraries.md","tags":[],"version":"current","lastUpdatedBy":"renovate[bot]","lastUpdatedAt":1743471356000,"frontMatter":{"id":"distribute-libraries","title":"Distributing i18n-friendly libraries"},"sidebar":"docs","previous":{"title":"Testing with formatjs","permalink":"/docs/guides/testing"},"next":{"title":"Runtime Requirements","permalink":"/docs/guides/runtime-requirements"}}');var r=t(6106),s=t(7389),a=t(9179),l=t(2597);const o={id:"distribute-libraries",title:"Distributing i18n-friendly libraries"},c=void 0,u={},d=[{value:"High level concept",id:"high-level-concept",level:2},{value:"Declaring in package.json",id:"declaring-in-packagejson",level:2},{value:"Declaring with a convention",id:"declaring-with-a-convention",level:2},{value:"Passing down <code>intl</code> object",id:"passing-down-intl-object",level:2}];function h(e){const n={a:"a",admonition:"admonition",code:"code",h2:"h2",img:"img",li:"li",p:"p",pre:"pre",ul:"ul",...(0,s.R)(),...e.components};return(0,r.jsxs)(r.Fragment,{children:[(0,r.jsx)(n.p,{children:"In larger scale applications/monorepos, not all components/libraries live within the same repo/project and they might get distributed differently. While there are multiple ways to solve this problem, this guide aims to provide a guidance that we've seen working quite well with large engineering orgs."}),"\n",(0,r.jsx)(n.h2,{id:"high-level-concept",children:"High level concept"}),"\n",(0,r.jsx)(n.p,{children:"Translated strings are basically assets, just like CSS, static configuration or images. The high level structure typically contains several layers:"}),"\n",(0,r.jsxs)(n.ul,{children:["\n",(0,r.jsx)(n.li,{children:"Reusable Components/Libraries that have translated strings, which can be nested."}),"\n",(0,r.jsx)(n.li,{children:"Consuming higher-level applications that consumes those components/libraries."}),"\n"]}),"\n",(0,r.jsx)(n.p,{children:(0,r.jsx)(n.img,{alt:"Distribution Hierarchy",src:t(5920).A+"",width:"560",height:"293"})}),"\n",(0,r.jsx)(n.p,{children:"Each feature/library would be in charge of:"}),"\n",(0,r.jsxs)(n.ul,{children:["\n",(0,r.jsxs)(n.li,{children:[(0,r.jsx)(n.a,{href:"/docs/getting-started/message-declaration",children:"Declaring its messages"}),"."]}),"\n",(0,r.jsxs)(n.li,{children:["Integrating with the ",(0,r.jsx)(n.a,{href:"/docs/getting-started/application-workflow",children:"translation pipeline"}),"."]}),"\n",(0,r.jsxs)(n.li,{children:["Declaring its translated & aggregated strings using either a ",(0,r.jsx)(n.a,{href:"https://docs.npmjs.com/files/package.json",children:"manifest like package.json"})," or a convention (always output to a specific location) or both."]}),"\n"]}),"\n",(0,r.jsx)(n.h2,{id:"declaring-in-packagejson",children:"Declaring in package.json"}),"\n",(0,r.jsxs)(n.p,{children:["This is similar to using ",(0,r.jsx)(n.code,{children:"style"})," attribute to declare CSS. You can declare something like"]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-json",children:'{\n "name": "my-library",\n "version": "1.0.0",\n "lang": "my-strings",\n "supportedLocales": ["en", "en-GB", "ja"]\n}\n'})}),"\n",(0,r.jsxs)(n.p,{children:["where ",(0,r.jsx)(n.code,{children:"my-strings"})," is the folder containing your translated strings in your ",(0,r.jsx)(n.code,{children:"supportedLocales"}),":"]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{children:"my-strings\n|- en.json\n|- en-GB.json\n|- ja.json\n"})}),"\n",(0,r.jsxs)(n.p,{children:["Consuming application can walk through ",(0,r.jsx)(n.code,{children:"node_modules"})," looking for ",(0,r.jsx)(n.code,{children:"package.json"})," files with these fields and aggregate the strings together into a single bundle (or multiple bundles) and serve those JSON however it chooses to."]}),"\n",(0,r.jsxs)(n.p,{children:["This provides flexibility to output translations to any location you want as long as it's declared in ",(0,r.jsx)(n.code,{children:"package.json"}),". However, this also incurs additional processing cost at the application level and also encourages inconsistency in output location."]}),"\n",(0,r.jsx)(n.h2,{id:"declaring-with-a-convention",children:"Declaring with a convention"}),"\n",(0,r.jsxs)(n.p,{children:["This is similar to ",(0,r.jsx)(n.a,{href:"#declaring-in-packagejson",children:"Declaring in package.json"}),", except translation is always output to ",(0,r.jsx)(n.code,{children:"lang/{locale}.json"}),". Upstream application can do"]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-sh",children:'formatjs compile "node_modules/**/lang/en.json" --ast --out-file lang/en.json\n'})}),"\n",(0,r.jsx)(n.p,{children:"to aggregate all its libraries' pre-translated strings."}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{children:"my-lib\n|- src\n|- lang\n |- en.json\n |- en-GB.json\n |- ja.json\n|- node_modules\n |- library1\n |- lang\n |- en.json\n |- en-GB.json\n |- ja.json\n |- library2\n |- lang\n |- en.json\n |- en-GB.json\n |- ja.json\n"})}),"\n",(0,r.jsx)(n.p,{children:"This provides consistency and minimize processing cost of different manifest files but also is less flexible."}),"\n",(0,r.jsx)(n.admonition,{type:"info",children:(0,r.jsxs)(n.p,{children:["We've seen ",(0,r.jsx)(n.code,{children:"convention"})," approach working better in large engineering org due to enforcement of convention & structure while ",(0,r.jsx)(n.code,{children:"manifest"})," approach working in a more open environment."]})}),"\n",(0,r.jsxs)(n.h2,{id:"passing-down-intl-object",children:["Passing down ",(0,r.jsx)(n.code,{children:"intl"})," object"]}),"\n",(0,r.jsxs)(n.p,{children:["The core of a i18n application is the ",(0,r.jsx)(n.code,{children:"intl"})," object, which contains precompiled messages, locale settings, format settings and cache. Therefore, this should only be initialized at the top level in the application."]}),"\n",(0,r.jsxs)(n.p,{children:["Component libraries can declare ",(0,r.jsx)(n.code,{children:"intl: IntlShape"})," as a prop and subsequently pass it down directly like:"]}),"\n",(0,r.jsxs)(a.A,{groupId:"engine",defaultValue:"react",values:[{label:"React",value:"react"},{label:"Vue3",value:"vue"}],children:[(0,r.jsxs)(l.A,{value:"react",children:[(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-tsx",children:"import {IntlShape} from 'react-intl'\nimport {MyButton, MyForm} from 'my-components'\ninterface Props {\n intl: IntlShape\n}\n\nfunction MyFeature(props: Props) {\n return (\n <div>\n <MyButton intl={props.intl} />\n <MyForm intl={props.intl} />\n </div>\n )\n}\n"})}),(0,r.jsxs)(n.p,{children:["or passing down via ",(0,r.jsx)(n.code,{children:"context"})," using ",(0,r.jsx)(n.code,{children:"RawIntlProvider"}),":"]}),(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-tsx",children:"import {IntlShape, RawIntlProvider} from 'react-intl'\nimport {MyButton, MyForm} from 'my-components'\ninterface Props {\n intl: IntlShape\n}\n\nfunction MyFeature(props: Props) {\n return (\n <RawIntlProvider value={props.intl}>\n <MyButton />\n <MyForm />\n </RawIntlProvider>\n )\n}\n"})})]}),(0,r.jsxs)(l.A,{value:"vue",children:[(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-ts",children:"import {useIntl} from 'vue-intl'\n\nconst MyFeature = {\n setup() {\n const intl = useIntl()\n return () =>\n h(\n 'p',\n {},\n intl.formatMessage({\n id: 'foo',\n defaultMessage: 'Hello',\n })\n )\n },\n}\n"})}),(0,r.jsxs)(n.p,{children:["or passing down via ",(0,r.jsx)(n.code,{children:"provideIntl"})]}),(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-ts",children:"import {createIntl} from '@formatjs/intl'\nimport {provideIntl, useIntl} from 'vue-intl'\n\nconst Ancestor = {\n setup() {\n provideIntl(\n createIntl({\n locale: 'en',\n defaultLocale: 'en',\n messages: {\n foo: 'Composed',\n },\n })\n )\n },\n render() {\n return h(MyFeature)\n },\n}\n"})})]})]})]})}function p(e={}){const{wrapper:n}={...(0,s.R)(),...e.components};return n?(0,r.jsx)(n,{...e,children:(0,r.jsx)(h,{...e})}):h(e)}},2597:(e,n,t)=>{t.d(n,{A:()=>a});t(7378);var i=t(3372);const r={tabItem:"tabItem_bSYy"};var s=t(6106);function a(e){let{children:n,hidden:t,className:a}=e;return(0,s.jsx)("div",{role:"tabpanel",className:(0,i.A)(r.tabItem,a),hidden:t,children:n})}},9179:(e,n,t)=>{t.d(n,{A:()=>w});var i=t(7378),r=t(3372),s=t(2214),a=t(1654),l=t(8970),o=t(3067),c=t(5512),u=t(3798);function d(e){return i.Children.toArray(e).filter((e=>"\n"!==e)).map((e=>{if(!e||(0,i.isValidElement)(e)&&function(e){const{props:n}=e;return!!n&&"object"==typeof n&&"value"in n}(e))return e;throw new Error(`Docusaurus error: Bad <Tabs> child <${"string"==typeof e.type?e.type:e.type.name}>: all children of the <Tabs> component should be <TabItem>, and every <TabItem> should have a unique "value" prop.`)}))?.filter(Boolean)??[]}function h(e){const{values:n,children:t}=e;return(0,i.useMemo)((()=>{const e=n??function(e){return d(e).map((e=>{let{props:{value:n,label:t,attributes:i,default:r}}=e;return{value:n,label:t,attributes:i,default:r}}))}(t);return function(e){const n=(0,c.XI)(e,((e,n)=>e.value===n.value));if(n.length>0)throw new Error(`Docusaurus error: Duplicate values "${n.map((e=>e.value)).join(", ")}" found in <Tabs>. 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