build: refactor frontend build

* Always write ESLint output to a file in addition to the console to make the
  lintFrontend task cacheable in Gradle (according to the output file).
* Make sure frontend task inputs are declared properly for caching.
* Make sure Typescript type checking is incremental.
* Do not use @tsconfig, because both Vite and SonarScanner have problems with
  extending tsconfig files from Yarn PnP modules.

1 files changed, 52 insertions, 0 deletions

diff --git a/subprojects/frontend/config/eslintReport.cjs b/subprojects/frontend/config/eslintReport.cjs
new file mode 100644
index 00000000..5bf6a041
--- /dev/null
+++ b/subprojects/frontend/config/eslintReport.cjs
@@ -0,0 +1,52 @@
+const { writeFile } = require('node:fs/promises');
+const path = require('node:path');
+const { Readable } = require('node:stream');
+const { pipeline } = require('node:stream/promises');
+
+const { ESLint } = require('eslint');
+
+const rootDir = path.join(__dirname, '..');
+
+/**
+ * Write ESLint report to console.
+ *
+ * @param cli {import('eslint').ESLint} The ESLint CLI.
+ * @param report {import('eslint').ESLint.LintResult[]} The ESLint report.
+ * @return {Promise<void>} A promise that resolves when the report is finished.
+ */
+async function reportToConsole(cli, report) {
+  const stylishFormatter = await cli.loadFormatter('stylish');
+  const output = new Readable();
+  output.push(await stylishFormatter.format(report));
+  output.push(null);
+  return pipeline(output, process.stdout);
+}
+
+/**
+ * Write ESLint report to the <code>build</code> directory.
+ *
+ * @param cli {import('eslint').ESLint} The ESLint CLI.
+ * @param report {import('eslint').ESLint.LintResult[]} The ESLint report.
+ * @return {Promise<void>} A promise that resolves when the report is finished.
+ */
+async function reportToJson(cli, report) {
+  const jsonFormatter = await cli.loadFormatter('json');
+  const json = await jsonFormatter.format(report);
+  const reportPath = path.join(rootDir, 'build', 'eslint.json');
+  return writeFile(reportPath, json, 'utf-8');
+}
+
+async function createReport() {
+  const cli = new ESLint({
+    useEslintrc: true,
+    cwd: rootDir,
+  });
+  const report = await cli.lintFiles('.');
+  await Promise.all([reportToConsole(cli, report), reportToJson(cli, report)]);
+
+  if (report.some((entry) => entry.errorCount > 0)) {
+    process.exitCode = 1;
+  }
+}
+
+createReport().catch(console.error);