test/static-code: tweak Typescript config again

Having `checkLib: false` in `tsconfig.conf` is a bad idea: it means that
if we want to check `.d.ts` files, we need a separate invocation of the
typescript compiler to do that.  It also means that `.d.ts` files won't
be checked in your editor by default.  Our workaround for this in
`test/static-code` only checks `cockpit.d.ts`, and we'll soon have other
declaration files.

We've been using `checkLib: false` as a crutch to avoid reporting errors
against `node_modules/`.  The relevant TypeScript issue is still
unaddressed: microsoft/TypeScript#30511

Modify `test/static-code` to only report errors if errors were found on
something outside of node_modules, but in that case, report all errors.
We do this with two invocations of `tsc`, to keep things simple, but
we'll only do the second invocation if we're reporting errors.  To keep
things speedy, we turn on "incremental" mode (which writes a cache file
to speed things up).  `.gitignore` that.  It now takes only ~2s to do an
incremental check in the "no errors" case.

By default, `tsc` outputs a very nice format that shows the exact
content of errors, but this doesn't work by default in
`test/static-code` because we capture the output before displaying it.
Detect if we're running on a TTY (or if `FORCE_COLOR=1` as from our
workflows) and enable the "pretty" output in that case.

.gitignore

@@ -62,6 +62,7 @@ Makefile.in
 /test_rsa_key
 /tmp-dist
 /tmp/
+/tsconfig.tsbuildinfo
 /version.m4
 /wsinstance-start
 

test/static-code

@@ -69,13 +69,11 @@ if [ "${WITH_PARTIAL_TREE:-0}" = 0 ]; then
 
     test_typescript() {
         test -x node_modules/.bin/tsc -a -x /usr/bin/node || skip 'no tsc'
-	# https://github.com/microsoft/TypeScript/issues/30511
-	# We can't tell tsc to ignore the .d.ts in node_modules/ and check our
-	# own cockpit.d.ts, so we do two separate invocations as a workaround:
-	if [ -n "$(git ls-files pkg/lib)" ]; then
-	    node_modules/.bin/tsc --typeRoots /dev/null --strict pkg/lib/cockpit.d.ts
-	fi
-	node_modules/.bin/tsc --checkJs false --skipLibCheck
+        # Only display tsc output if it contains errors about something other than node_modules/
+        # https://github.com/microsoft/TypeScript/issues/30511
+        if node_modules/.bin/tsc --checkJs false --pretty false | grep -Eqv '^(node_modules| )'; then
+            node_modules/.bin/tsc ${FORCE_COLOR:+--pretty true} --checkJs false
+        fi
     }
 fi
 
@@ -162,6 +160,10 @@ main() {
         exit 0
     fi
 
+    if test -t 1; then
+        FORCE_COLOR=1
+    fi
+
     exit_status=0
     counter=0
 

tsconfig.json

@@ -14,14 +14,14 @@
         "baseUrl": "./pkg/lib",
         "esModuleInterop": true,
         "exactOptionalPropertyTypes": true,
+        "incremental": true,
         "jsx": "react",
         "lib": [
             "dom",
             "es2020"
         ],
         "moduleResolution": "node",
         "noEmit": true,  // we only use `tsc` for type checking
-        "skipLibCheck": true,  // don't check node_modules
         "strict": true,
         "target": "es2020",
     },