Just because the standard path module didn't feel easy enough.
setDir(s) replaces all dirs.
const p1 = new FilePath('a/b/c.md')
const p2 = p1.setDir('x/y')
// p1 == 'a/b/c.md'
// p2 == 'x/y/c.md'
setFile changes the name of the (without the extension).
const p1 = new FilePath('a/b/c.md')
const p2 = p1.setFile('x')
// p1 == 'a/b/c.md'
// p2 == 'a/b/x.md'
setExt changes just the extension of the path
const p1 = new FilePath('a/b/c.md')
const p2 = p1.setExt('html')
// p1 == 'a/b/c.md'
// p2 == 'a/b/c.html'
push(s) appends directories at the end.
const p1 = new FilePath('a/b/c.md')
const p2 = p1.push('d/e')
// p1 == 'a/b/c.md'
// p2 == 'a/b/d/e/c.md'
pop(n) strips n directory levels from the end.
const p1 = new FilePath('a/b/c.md')
const p2 = p1.pop(1)
// p1 == 'a/b/c.md'
// p2 == 'a/c.md'
shift(n) strips n directory levels from the beginning.
const p1 = new FilePath('a/b/c.md')
const p2 = p1.shift(1)
// p1 == 'a/b/c.md'
// p2 == 'b/c.md'
unshift(s) prefixes directories at the beginning.
const p1 = new FilePath('a/b/c.md')
const p2 = p1.unshift('x/y')
// p1 == 'a/b/c.md'
// p2 == 'x/y/a/b/c.md'
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