Doesn't look like overriding the dev port is possible:
https://github.com/sveltejs/sapper/blob/c5456d30334c91982d347db29de8af9ea684dd2e/src/api/dev.ts#L107
Not clear where this.port is set, but I'd love to see devPort treated the same. Makes containing the code easier.
Good idea! Added a --dev-port flag in 0.18.4 — thanks
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Good idea! Added a
--dev-portflag in 0.18.4 — thanks