Cannot assign to 'unit' because it is a read-only property.

[Smidul]

In typescript, I'm unable to reassign parse.unit to switch locales as documented, since it's declared as a const in the typings:

parse-duration/index.d.ts

Lines 24 to 26 in 2c0c072

	declare namespace parse {
	const unit: Units;
	}

Declaring it as a let works fine:

declare namespace parse { 
   let unit: Units; 
 }

[dy]

You can extend units Object.assign(parse.unit, {...}) before v2.1.3.
Fixed in 2.1.3