chore: add copyright headers

Make sure we obey the REUSE (https://reuse.software) specification and the
origin, copyright owner, and license of all files are clearly marked.

The whole project is under the EPL-2.0, except for trivial files where copyright
is not applicable that are marked with the CC0-1.0 license. Moreover, code
included from third parties is also available under the respective license.

chore: add CONTRIBUTORS.md

List all authors and supporting organizations in accordance with the REUSE
specification.

1 files changed, 13 insertions, 0 deletions

diff --git a/subprojects/frontend/tsconfig.base.json b/subprojects/frontend/tsconfig.base.json
index 30e707ae..58a2a6f2 100644
--- a/subprojects/frontend/tsconfig.base.json
+++ b/subprojects/frontend/tsconfig.base.json
@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) Microsoft Corporation.
+ * Copyright (c) 2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: MIT OR EPL-2.0
+ *
+ * This file is based on
+ * https://github.com/tsconfig/bases/blob/7db25a41bc5a9c0f66d91f6f3aa28438afcb2f18/bases/strictest.json
+ * but we moved it inside the project for better tooling support.
+ */
 {
   "compilerOptions": {
     "strict": true,
@@ -11,6 +21,8 @@
     "noUncheckedIndexedAccess": true,
     "noUnusedLocals": true,
     "noUnusedParameters": true,
+    // "verbatimModuleSyntax" is incompatible with `import` syntax in modules
+    // with CommonJS import resolution, so we use "isolatedModules" only.
     "verbatimModuleSyntax": false,
     "isolatedModules": true,
     "checkJs": true,
@@ -18,6 +30,7 @@
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true,
     "useDefineForClassFields": true,
+    // Project-specific configuration below.
     "module": "es2022",
     "moduleResolution": "node",
     "incremental": true,