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Retaining the modified title on component unmount made optional. (#2)

* Option added to retain the modified title or to rollback to the default title ON the corresponding component unmount event (e.g. route change -> title change for those using this hook, but rollback to the default/original title for those routes not using this hook.)* Using useRef to get the default title.

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`‎index.js‎`

Lines changed: 9 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -1,10 +1,16 @@`
`1`	`1`	`'use strict';`
`2`		`-let{ useEffect}=require('react');`
	`2`	`+let{ useRef, useEffect}=require('react');`
	`3`	`+`
	`4`	`+functionuseDocumentTitle(title,retainOnUnmount=false){`
	`5`	`+constdefaultTitle=useRef(document.title);`
`3`	`6`
`4`		`-functionuseDocumentTitle(title){`
`5`	`7`	`useEffect(()=>{`
`6`	`8`	`document.title=title;`
`7`		`-},[title])`
	`9`	`+`
	`10`	`+return()=>{`
	`11`	`+if(!retainOnUnmount)document.title=defaultTitle.current;`
	`12`	`+};`
	`13`	`+},[title]);`
`8`	`14`	`}`
`9`	`15`
`10`	`16`	`module.exports=useDocumentTitle;`

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Commit56dba6f

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`‎index.js‎`

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