build works now

scripts/patch.sh

@@ -21,6 +21,56 @@ apply_patches() {
 apply_patches ui     httptoolkit-ui
 apply_patches server httptoolkit-server
 
+# `src/config.d.ts` is a types-only module: tsc erases `import { HtkConfig } from
+# './config'` entirely, but bun's bundler resolves imports for real and fails
+# ("Could not resolve: ./config") because a .d.ts isn't a bundleable source file.
+# Promote it to a real .ts module so bun can resolve it - it holds only exported
+# interfaces, so it compiles down to nothing. Derived from upstream rather than
+# vendored, so it can't drift out of sync with the real type.
+promote_dts_to_ts() {
+    local dts="$1" ts="${1%.d.ts}.ts"
+    [ -f "$dts" ] || { echo "!! expected $dts to exist (upstream moved?)"; exit 1; }
+    # Anything other than exported type declarations would need real runtime code:
+    if grep -qE '^\s*(declare|import|export\s+(const|let|var|function|class|default))' "$dts"; then
+        echo "!! $dts is no longer types-only - it needs a real runtime module now"
+        exit 1
+    fi
+    echo "  - $dts -> $ts"
+    mv "$dts" "$ts"
+}
+
+echo "==> [server] promoting types-only modules to real modules (for bun)"
+promote_dts_to_ts httptoolkit-server/src/config.d.ts
+
+# Upstream targets es2020 and never sets useDefineForClassFields, so tsc defaults
+# it to false: class field initialisers are emitted *inside* the constructor,
+# after parameter properties are assigned. Bun ignores that inferred default and
+# emits native ES class fields, which run BEFORE the constructor body - so any
+# class doing `constructor(private config: X)` plus a field initialiser that
+# reads `this.config` (e.g. ElectronInterceptor.certData) crashes with
+# "undefined is not an object". Set the flag explicitly to restore tsc semantics.
+# APP_ROOT is derived from __dirname, which in a compiled binary is a build-machine
+# path that doesn't exist for users. Everything hanging off it then breaks at
+# runtime - OVERRIDES_DIR most visibly ("Unable to access jarfile
+# .../overrides/java-agent.jar", "lstat .../overrides/webextension"), which takes
+# out JVM/terminal interception and the WebRTC webextension. Make it overridable so
+# htk-entry.ts can point it at the directory it extracts the embedded overrides to.
+echo "==> [server] making APP_ROOT overridable via HTK_APP_ROOT"
+APP_ROOT_LINE="export const APP_ROOT = path.join(__dirname, '..');"
+if grep -qF "$APP_ROOT_LINE" httptoolkit-server/src/constants.ts; then
+    sed -i "s|$APP_ROOT_LINE|export const APP_ROOT = process.env.HTK_APP_ROOT \|\| path.join(__dirname, '..');|" \
+        httptoolkit-server/src/constants.ts
+elif grep -q 'HTK_APP_ROOT' httptoolkit-server/src/constants.ts; then
+    echo "  - already applied"
+else
+    echo "!! APP_ROOT definition not found in constants.ts (upstream moved?)"; exit 1
+fi
+
+echo "==> [server] pinning useDefineForClassFields=false (tsc semantics for bun)"
+jq '.compilerOptions.useDefineForClassFields = false' \
+    httptoolkit-server/tsconfig.json > httptoolkit-server/tsconfig.json.tmp
+mv httptoolkit-server/tsconfig.json.tmp httptoolkit-server/tsconfig.json
+
 echo "==> Copying overlay into httptoolkit-server"
 cp -v overlay/server/htk-entry.ts        httptoolkit-server/htk-entry.ts
 cp -v overlay/server/src/htk-app.ts      httptoolkit-server/src/htk-app.ts