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feat(nix): lib.mkWebapp accepts extraEnv for build-time VITE_* vars

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NixOS consumers (webapp-module's hub build, server-deploy's
standalones module) bake VITE_* env vars into the bundle at build
time: VITE_BASE_PATH for path-mounted standalones,
VITE_LNBITS_BASE_URL / VITE_NOSTR_RELAYS / VITE_LIGHTNING_DOMAIN /
etc. for per-deployment service URLs.

extraEnv is merged on top of the brand kit + sandbox defaults
(BRAND_DIR, BRAND_APP, CI). Brand-controlled vars (VITE_APP_NAME via
brand.name) stay strict — the vite configs internally set
process.env.VITE_APP_NAME from brand.json after the derivation
starts, so an extraEnv attempt at VITE_APP_NAME is a no-op (by
design, per #99 strict-from-the-start). Per-host name customization
flows through per-host brandDir, not env vars.

Verified VITE_BASE_PATH=/events/ via extraEnv emits hrefs prefixed
with /events/ in the built events.html.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Padreug 2026-06-10 16:42:57 +02:00
commit f2967616d3
1 changed files with 8 additions and 2 deletions
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10
flake.nix
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@ -19,7 +19,7 @@
inherit (pkgs.stdenv.hostPlatform) system;
};
mkWebapp = { pkgs, brandDir ? ./branding/default, app ? "main" }:
mkWebapp = { pkgs, brandDir ? ./branding/default, app ? "main", extraEnv ? {} }:
let
buildScript = if app == "main" then "build" else "build:${app}";
outDir = if app == "main" then "dist" else "dist-${app}";
@ -59,13 +59,19 @@
# pwa-assets.config.ts. brandDir is either ./branding/default
# (a path inside this flake's source) or an external path that
# nix has copied into the build sandbox.
#
# `extraEnv` flows in VITE_* and any other build-time env vars
# the caller wants to bake into the bundle (e.g. webapp-module
# passes VITE_NOSTR_RELAYS / VITE_LNBITS_BASE_URL / …; the
# server-deploy standalones module passes VITE_BASE_PATH +
# VITE_APP_NAME for per-app path mounts).
env = {
BRAND_DIR = "${brandDir}";
BRAND_APP = if app == "main" then "" else app;
# Avoid pnpm 10's interactive modules-purge prompt in the
# sandbox (ERR_PNPM_ABORTED_REMOVE_MODULES_DIR_NO_TTY).
CI = "true";
};
} // extraEnv;
buildPhase = ''
runHook preBuild