I'm trying to generate an XLSX Excel document with JS-XLSX and I can't find a way to create the equivalent of an internal link.
I have this summary page in which I'd like to present clickable links pointing to other sheets.

I've tried many combination of cell = {l: {Target: "..", Rel: {Target: "...", Type:"Internal"}}} but it doesn't work. It always ends up as an external hyperlink in the generated document.
I'm using JS-XLSX 0.10.4.
Is this a supported use case?
As a general rule, everything is in the README. If it's not mentioned there, it's either currently unsupported or a bug in the README.
The write logic currently assumes an external hyperlink for every link and every relationship, so at the moment it is not supported. It's relatively simple to fix, we'll try to roll out something in the next release. We will have to add a new flag to the link object.
Would be great to have this feature and also the ability to add VBA code.
You can use formula.
sheet['A1'].f = '=HYPERLINK("#\'Section1\'!A1,"Section 1")';
In the internal representation, set a cell's .l key to be an object with Target set to the reference prepended by a # e.g.
ws['A1'].l = { Target: "#Sheet2!A1" } // Link to a cell
ws['A2'].l = { Target: "#Sheet2!A1:D4" } // Link to a range
ws['A3'].l = { Target: "#SomeName" } // Link to a global or same-worksheet defined name
ws['A4'].l = { Target: "#Sheet2!SomeName" } // Link to an out-of-scope defined name
@UzverNumber47 's approach also works
ws['A1'].l = { Target: "'#SheetName'!A1" } is ok for me.
Most helpful comment
In the internal representation, set a cell's
.lkey to be an object withTargetset to the reference prepended by a#e.g.@UzverNumber47 's approach also works