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.

93 files changed, 535 insertions, 6 deletions

diff --git a/subprojects/frontend/.eslintrc.cjs b/subprojects/frontend/.eslintrc.cjs
index dc03d721..466e5668 100644
--- a/subprojects/frontend/.eslintrc.cjs
+++ b/subprojects/frontend/.eslintrc.cjs
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 const path = require('node:path');
 
 // Allow the Codium ESLint plugin to find `tsconfig.json` from the repository root.
diff --git a/subprojects/frontend/assets-src/favicon.svg.license b/subprojects/frontend/assets-src/favicon.svg.license
new file mode 100644
index 00000000..e5db6ccd
--- /dev/null
+++ b/subprojects/frontend/assets-src/favicon.svg.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+
+SPDX-License-Identifier: EPL-2.0
diff --git a/subprojects/frontend/assets-src/icon.svg.license b/subprojects/frontend/assets-src/icon.svg.license
new file mode 100644
index 00000000..e5db6ccd
--- /dev/null
+++ b/subprojects/frontend/assets-src/icon.svg.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+
+SPDX-License-Identifier: EPL-2.0
diff --git a/subprojects/frontend/assets-src/mask-icon.svg.license b/subprojects/frontend/assets-src/mask-icon.svg.license
new file mode 100644
index 00000000..e5db6ccd
--- /dev/null
+++ b/subprojects/frontend/assets-src/mask-icon.svg.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+
+SPDX-License-Identifier: EPL-2.0
diff --git a/subprojects/frontend/build.gradle.kts b/subprojects/frontend/build.gradle.kts
index 80f10f7e..9fd99742 100644
--- a/subprojects/frontend/build.gradle.kts
+++ b/subprojects/frontend/build.gradle.kts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import org.siouan.frontendgradleplugin.infrastructure.gradle.RunYarn
 import tools.refinery.gradle.utils.SonarPropertiesUtils
 
diff --git a/subprojects/frontend/config/backendConfigVitePlugin.ts b/subprojects/frontend/config/backendConfigVitePlugin.ts
index 7a6bc3db..3bffce3a 100644
--- a/subprojects/frontend/config/backendConfigVitePlugin.ts
+++ b/subprojects/frontend/config/backendConfigVitePlugin.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type { PluginOption } from 'vite';
 
 import type BackendConfig from '../src/xtext/BackendConfig';
diff --git a/subprojects/frontend/config/detectDevModeOptions.ts b/subprojects/frontend/config/detectDevModeOptions.ts
index b3696241..665204dc 100644
--- a/subprojects/frontend/config/detectDevModeOptions.ts
+++ b/subprojects/frontend/config/detectDevModeOptions.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type { PluginOption, ServerOptions } from 'vite';
 
 import backendConfigVitePlugin, {
diff --git a/subprojects/frontend/config/eslintReport.cjs b/subprojects/frontend/config/eslintReport.cjs
index 5bf6a041..7c4b7bd6 100644
--- a/subprojects/frontend/config/eslintReport.cjs
+++ b/subprojects/frontend/config/eslintReport.cjs
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 const { writeFile } = require('node:fs/promises');
 const path = require('node:path');
 const { Readable } = require('node:stream');
diff --git a/subprojects/frontend/config/fetchPackageMetadata.ts b/subprojects/frontend/config/fetchPackageMetadata.ts
index 50807b03..02e16d57 100644
--- a/subprojects/frontend/config/fetchPackageMetadata.ts
+++ b/subprojects/frontend/config/fetchPackageMetadata.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { readFile } from 'node:fs/promises';
 import path from 'node:path';
 
diff --git a/subprojects/frontend/config/manifest.ts b/subprojects/frontend/config/manifest.ts
index 3cec777c..1822dc7c 100644
--- a/subprojects/frontend/config/manifest.ts
+++ b/subprojects/frontend/config/manifest.ts
@@ -1,10 +1,16 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type { ManifestOptions } from 'vite-plugin-pwa';
 
 const manifest: Partial<ManifestOptions> = {
   lang: 'en-US',
   name: 'Refinery',
   short_name: 'Refinery',
-  description: 'An efficient graph sovler for generating well-formed models',
+  description: 'An efficient graph solver for generating well-formed models',
   theme_color: '#f5f5f5',
   display_override: ['window-controls-overlay'],
   display: 'standalone',
diff --git a/subprojects/frontend/config/minifyHTMLVitePlugin.ts b/subprojects/frontend/config/minifyHTMLVitePlugin.ts
index 18336d4d..7c08c488 100644
--- a/subprojects/frontend/config/minifyHTMLVitePlugin.ts
+++ b/subprojects/frontend/config/minifyHTMLVitePlugin.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { minify, type Options as TerserOptions } from 'html-minifier-terser';
 import type { PluginOption } from 'vite';
 
diff --git a/subprojects/frontend/config/preloadFontsVitePlugin.ts b/subprojects/frontend/config/preloadFontsVitePlugin.ts
index bc6f8eaf..5c04477a 100644
--- a/subprojects/frontend/config/preloadFontsVitePlugin.ts
+++ b/subprojects/frontend/config/preloadFontsVitePlugin.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import micromatch from 'micromatch';
 import type { PluginOption } from 'vite';
 
diff --git a/subprojects/frontend/index.html b/subprojects/frontend/index.html
index 8b6814eb..e1d2bf14 100644
--- a/subprojects/frontend/index.html
+++ b/subprojects/frontend/index.html
@@ -1,4 +1,9 @@
 <!DOCTYPE html>
+<!--
+  SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+
+  SPDX-License-Identifier: EPL-2.0
+-->
 <html lang="en-US">
   <head>
     <meta charset="utf-8">
diff --git a/subprojects/frontend/package.json b/subprojects/frontend/package.json
index e6bcc89e..cd96a574 100644
--- a/subprojects/frontend/package.json
+++ b/subprojects/frontend/package.json
@@ -1,4 +1,9 @@
 {
+  "//": [
+    "SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>",
+    "",
+    "SPDX-License-Identifier: EPL-2.0"
+  ],
   "name": "@refinery/frontend",
   "version": "0.0.0",
   "description": "Web frontend for Refinery",
@@ -16,10 +21,10 @@
     "type": "git",
     "url": "git+https://github.com/graphs4value/refinery.git"
   },
-  "author": "Refinery authors",
+  "author": "The Refinery Authors <https://refinery.tools/>",
   "license": "EPL-2.0",
   "bugs": {
-    "url": "https://github.com/graphs4value/issues"
+    "url": "https://github.com/graphs4value/refinery/issues"
   },
   "homepage": "https://refinery.tools",
   "dependencies": {
diff --git a/subprojects/frontend/prettier.config.cjs b/subprojects/frontend/prettier.config.cjs
index 75f5c54d..6f9ff7ad 100644
--- a/subprojects/frontend/prettier.config.cjs
+++ b/subprojects/frontend/prettier.config.cjs
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 /** @type {import('prettier').Config} */
 module.exports = {
   singleQuote: true,
diff --git a/subprojects/frontend/public/apple-touch-icon.png.license b/subprojects/frontend/public/apple-touch-icon.png.license
new file mode 100644
index 00000000..e5db6ccd
--- /dev/null
+++ b/subprojects/frontend/public/apple-touch-icon.png.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+
+SPDX-License-Identifier: EPL-2.0
diff --git a/subprojects/frontend/public/favicon-96x96.png.license b/subprojects/frontend/public/favicon-96x96.png.license
new file mode 100644
index 00000000..e5db6ccd
--- /dev/null
+++ b/subprojects/frontend/public/favicon-96x96.png.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+
+SPDX-License-Identifier: EPL-2.0
diff --git a/subprojects/frontend/public/favicon.png.license b/subprojects/frontend/public/favicon.png.license
new file mode 100644
index 00000000..e5db6ccd
--- /dev/null
+++ b/subprojects/frontend/public/favicon.png.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+
+SPDX-License-Identifier: EPL-2.0
diff --git a/subprojects/frontend/public/favicon.svg.license b/subprojects/frontend/public/favicon.svg.license
new file mode 100644
index 00000000..e5db6ccd
--- /dev/null
+++ b/subprojects/frontend/public/favicon.svg.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+
+SPDX-License-Identifier: EPL-2.0
diff --git a/subprojects/frontend/public/icon-192x192.png.license b/subprojects/frontend/public/icon-192x192.png.license
new file mode 100644
index 00000000..e5db6ccd
--- /dev/null
+++ b/subprojects/frontend/public/icon-192x192.png.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+
+SPDX-License-Identifier: EPL-2.0
diff --git a/subprojects/frontend/public/icon-512x512.png.license b/subprojects/frontend/public/icon-512x512.png.license
new file mode 100644
index 00000000..e5db6ccd
--- /dev/null
+++ b/subprojects/frontend/public/icon-512x512.png.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+
+SPDX-License-Identifier: EPL-2.0
diff --git a/subprojects/frontend/public/icon-any.svg.license b/subprojects/frontend/public/icon-any.svg.license
new file mode 100644
index 00000000..e5db6ccd
--- /dev/null
+++ b/subprojects/frontend/public/icon-any.svg.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+
+SPDX-License-Identifier: EPL-2.0
diff --git a/subprojects/frontend/public/mask-icon.svg.license b/subprojects/frontend/public/mask-icon.svg.license
new file mode 100644
index 00000000..e5db6ccd
--- /dev/null
+++ b/subprojects/frontend/public/mask-icon.svg.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+
+SPDX-License-Identifier: EPL-2.0
diff --git a/subprojects/frontend/public/robots.txt b/subprojects/frontend/public/robots.txt
index c2a49f4f..e7c73099 100644
--- a/subprojects/frontend/public/robots.txt
+++ b/subprojects/frontend/public/robots.txt
@@ -1,2 +1,6 @@
+# SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+#
+# SPDX-License-Identifier: CC0-1.0
+
 User-agent: *
 Allow: /
diff --git a/subprojects/frontend/src/App.tsx b/subprojects/frontend/src/App.tsx
index cd394345..7f242529 100644
--- a/subprojects/frontend/src/App.tsx
+++ b/subprojects/frontend/src/App.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import Box from '@mui/material/Box';
 import CssBaseline from '@mui/material/CssBaseline';
 import { throttle } from 'lodash-es';
diff --git a/subprojects/frontend/src/Loading.tsx b/subprojects/frontend/src/Loading.tsx
index 489563e0..adee4f0e 100644
--- a/subprojects/frontend/src/Loading.tsx
+++ b/subprojects/frontend/src/Loading.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import CircularProgress from '@mui/material/CircularProgress';
 import { styled } from '@mui/material/styles';
 
diff --git a/subprojects/frontend/src/PWAStore.ts b/subprojects/frontend/src/PWAStore.ts
index e9f99e2a..a1b3ffd9 100644
--- a/subprojects/frontend/src/PWAStore.ts
+++ b/subprojects/frontend/src/PWAStore.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { makeAutoObservable, observable } from 'mobx';
 import ms from 'ms';
 // eslint-disable-next-line import/no-unresolved -- Importing virtual module.
diff --git a/subprojects/frontend/src/Refinery.tsx b/subprojects/frontend/src/Refinery.tsx
index f0162349..b5ff94e1 100644
--- a/subprojects/frontend/src/Refinery.tsx
+++ b/subprojects/frontend/src/Refinery.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import Grow from '@mui/material/Grow';
 import Stack from '@mui/material/Stack';
 import { SnackbarProvider } from 'notistack';
diff --git a/subprojects/frontend/src/RootStore.ts b/subprojects/frontend/src/RootStore.ts
index 2e76d66d..b84c0ce0 100644
--- a/subprojects/frontend/src/RootStore.ts
+++ b/subprojects/frontend/src/RootStore.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { getLogger } from 'loglevel';
 import { makeAutoObservable, runInAction } from 'mobx';
 
diff --git a/subprojects/frontend/src/RootStoreProvider.tsx b/subprojects/frontend/src/RootStoreProvider.tsx
index 2c11a0f9..7cb89af1 100644
--- a/subprojects/frontend/src/RootStoreProvider.tsx
+++ b/subprojects/frontend/src/RootStoreProvider.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { type ReactNode, createContext, useContext } from 'react';
 
 import type RootStore from './RootStore';
diff --git a/subprojects/frontend/src/ToggleDarkModeButton.tsx b/subprojects/frontend/src/ToggleDarkModeButton.tsx
index 59714f20..7a835e61 100644
--- a/subprojects/frontend/src/ToggleDarkModeButton.tsx
+++ b/subprojects/frontend/src/ToggleDarkModeButton.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import DarkModeIcon from '@mui/icons-material/DarkMode';
 import LightModeIcon from '@mui/icons-material/LightMode';
 import IconButton from '@mui/material/IconButton';
diff --git a/subprojects/frontend/src/TopBar.tsx b/subprojects/frontend/src/TopBar.tsx
index 5a825512..f2542b14 100644
--- a/subprojects/frontend/src/TopBar.tsx
+++ b/subprojects/frontend/src/TopBar.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import GitHubIcon from '@mui/icons-material/GitHub';
 import AppBar from '@mui/material/AppBar';
 import Button from '@mui/material/Button';
diff --git a/subprojects/frontend/src/UpdateNotification.tsx b/subprojects/frontend/src/UpdateNotification.tsx
index 5c8c2d01..d86c0703 100644
--- a/subprojects/frontend/src/UpdateNotification.tsx
+++ b/subprojects/frontend/src/UpdateNotification.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import Button from '@mui/material/Button';
 import { observer } from 'mobx-react-lite';
 import { useEffect } from 'react';
diff --git a/subprojects/frontend/src/WindowControlsOverlayColor.tsx b/subprojects/frontend/src/WindowControlsOverlayColor.tsx
index 14eda566..cfa468ea 100644
--- a/subprojects/frontend/src/WindowControlsOverlayColor.tsx
+++ b/subprojects/frontend/src/WindowControlsOverlayColor.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { useTheme } from '@mui/material/styles';
 import { useEffect } from 'react';
 
diff --git a/subprojects/frontend/src/editor/AnimatedButton.tsx b/subprojects/frontend/src/editor/AnimatedButton.tsx
index f75d4617..dbbda618 100644
--- a/subprojects/frontend/src/editor/AnimatedButton.tsx
+++ b/subprojects/frontend/src/editor/AnimatedButton.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import Box from '@mui/material/Box';
 import Button from '@mui/material/Button';
 import { styled, type SxProps, type Theme } from '@mui/material/styles';
diff --git a/subprojects/frontend/src/editor/ConnectButton.tsx b/subprojects/frontend/src/editor/ConnectButton.tsx
index e2d251f3..eed6fbc7 100644
--- a/subprojects/frontend/src/editor/ConnectButton.tsx
+++ b/subprojects/frontend/src/editor/ConnectButton.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import CloudIcon from '@mui/icons-material/Cloud';
 import CloudOffIcon from '@mui/icons-material/CloudOff';
 import SyncIcon from '@mui/icons-material/Sync';
diff --git a/subprojects/frontend/src/editor/ConnectionStatusNotification.tsx b/subprojects/frontend/src/editor/ConnectionStatusNotification.tsx
index 9b27f45c..b7b962ab 100644
--- a/subprojects/frontend/src/editor/ConnectionStatusNotification.tsx
+++ b/subprojects/frontend/src/editor/ConnectionStatusNotification.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import Button from '@mui/material/Button';
 import { observer } from 'mobx-react-lite';
 import { useEffect } from 'react';
diff --git a/subprojects/frontend/src/editor/DiagnosticValue.ts b/subprojects/frontend/src/editor/DiagnosticValue.ts
index b4e0b165..20478262 100644
--- a/subprojects/frontend/src/editor/DiagnosticValue.ts
+++ b/subprojects/frontend/src/editor/DiagnosticValue.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type { Diagnostic } from '@codemirror/lint';
 import { RangeValue } from '@codemirror/state';
 
diff --git a/subprojects/frontend/src/editor/EditorArea.tsx b/subprojects/frontend/src/editor/EditorArea.tsx
index cfb988b2..905fa2ec 100644
--- a/subprojects/frontend/src/editor/EditorArea.tsx
+++ b/subprojects/frontend/src/editor/EditorArea.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import Box from '@mui/material/Box';
 import { useTheme } from '@mui/material/styles';
 import { observer } from 'mobx-react-lite';
diff --git a/subprojects/frontend/src/editor/EditorButtons.tsx b/subprojects/frontend/src/editor/EditorButtons.tsx
index 53b06e23..9b187e5c 100644
--- a/subprojects/frontend/src/editor/EditorButtons.tsx
+++ b/subprojects/frontend/src/editor/EditorButtons.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type { Diagnostic } from '@codemirror/lint';
 import CheckIcon from '@mui/icons-material/Check';
 import ErrorIcon from '@mui/icons-material/Error';
diff --git a/subprojects/frontend/src/editor/EditorPane.tsx b/subprojects/frontend/src/editor/EditorPane.tsx
index f7f8241a..87f408fe 100644
--- a/subprojects/frontend/src/editor/EditorPane.tsx
+++ b/subprojects/frontend/src/editor/EditorPane.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import Box from '@mui/material/Box';
 import Skeleton from '@mui/material/Skeleton';
 import Stack from '@mui/material/Stack';
diff --git a/subprojects/frontend/src/editor/EditorStore.ts b/subprojects/frontend/src/editor/EditorStore.ts
index 0a0d885d..b98f085e 100644
--- a/subprojects/frontend/src/editor/EditorStore.ts
+++ b/subprojects/frontend/src/editor/EditorStore.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type {
   CompletionContext,
   CompletionResult,
diff --git a/subprojects/frontend/src/editor/EditorTheme.ts b/subprojects/frontend/src/editor/EditorTheme.ts
index 01b65a7e..023a8f73 100644
--- a/subprojects/frontend/src/editor/EditorTheme.ts
+++ b/subprojects/frontend/src/editor/EditorTheme.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import errorSVG from '@material-icons/svg/svg/error/baseline.svg?raw';
 import expandMoreSVG from '@material-icons/svg/svg/expand_more/baseline.svg?raw';
 import infoSVG from '@material-icons/svg/svg/info/baseline.svg?raw';
diff --git a/subprojects/frontend/src/editor/GenerateButton.tsx b/subprojects/frontend/src/editor/GenerateButton.tsx
index 2036fc28..3837ef8e 100644
--- a/subprojects/frontend/src/editor/GenerateButton.tsx
+++ b/subprojects/frontend/src/editor/GenerateButton.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import DangerousOutlinedIcon from '@mui/icons-material/DangerousOutlined';
 import PlayArrowIcon from '@mui/icons-material/PlayArrow';
 import Button from '@mui/material/Button';
diff --git a/subprojects/frontend/src/editor/LintPanelStore.ts b/subprojects/frontend/src/editor/LintPanelStore.ts
index 502f9c59..f81587fa 100644
--- a/subprojects/frontend/src/editor/LintPanelStore.ts
+++ b/subprojects/frontend/src/editor/LintPanelStore.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { closeLintPanel, openLintPanel } from '@codemirror/lint';
 
 import type EditorStore from './EditorStore';
diff --git a/subprojects/frontend/src/editor/PanelStore.ts b/subprojects/frontend/src/editor/PanelStore.ts
index 4f827280..25ef8b6c 100644
--- a/subprojects/frontend/src/editor/PanelStore.ts
+++ b/subprojects/frontend/src/editor/PanelStore.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type { Command } from '@codemirror/view';
 import { action, makeObservable, observable } from 'mobx';
 
diff --git a/subprojects/frontend/src/editor/SearchPanel.ts b/subprojects/frontend/src/editor/SearchPanel.ts
index c9df41b7..b63d5eed 100644
--- a/subprojects/frontend/src/editor/SearchPanel.ts
+++ b/subprojects/frontend/src/editor/SearchPanel.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import {
   type EditorView,
   type Panel,
diff --git a/subprojects/frontend/src/editor/SearchPanelPortal.tsx b/subprojects/frontend/src/editor/SearchPanelPortal.tsx
index 5cf1c90e..b4b07c74 100644
--- a/subprojects/frontend/src/editor/SearchPanelPortal.tsx
+++ b/subprojects/frontend/src/editor/SearchPanelPortal.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import Portal from '@mui/material/Portal';
 import { observer } from 'mobx-react-lite';
 
diff --git a/subprojects/frontend/src/editor/SearchPanelStore.ts b/subprojects/frontend/src/editor/SearchPanelStore.ts
index 65d595a8..6a97baf1 100644
--- a/subprojects/frontend/src/editor/SearchPanelStore.ts
+++ b/subprojects/frontend/src/editor/SearchPanelStore.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import {
   closeSearchPanel,
   findNext,
diff --git a/subprojects/frontend/src/editor/SearchToolbar.tsx b/subprojects/frontend/src/editor/SearchToolbar.tsx
index 54f3dba7..4ae7e893 100644
--- a/subprojects/frontend/src/editor/SearchToolbar.tsx
+++ b/subprojects/frontend/src/editor/SearchToolbar.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import CloseIcon from '@mui/icons-material/Close';
 import FindReplaceIcon from '@mui/icons-material/FindReplace';
 import KeyboardArrowDownIcon from '@mui/icons-material/KeyboardArrowDown';
diff --git a/subprojects/frontend/src/editor/createEditorState.ts b/subprojects/frontend/src/editor/createEditorState.ts
index ce1efa4f..4a8e9832 100644
--- a/subprojects/frontend/src/editor/createEditorState.ts
+++ b/subprojects/frontend/src/editor/createEditorState.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import {
   closeBrackets,
   closeBracketsKeymap,
diff --git a/subprojects/frontend/src/editor/defineDecorationSetExtension.ts b/subprojects/frontend/src/editor/defineDecorationSetExtension.ts
index d9c7bc7d..0887c92e 100644
--- a/subprojects/frontend/src/editor/defineDecorationSetExtension.ts
+++ b/subprojects/frontend/src/editor/defineDecorationSetExtension.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { StateEffect, StateField, TransactionSpec } from '@codemirror/state';
 import { EditorView, Decoration, DecorationSet } from '@codemirror/view';
 
diff --git a/subprojects/frontend/src/editor/exposeDiagnostics.ts b/subprojects/frontend/src/editor/exposeDiagnostics.ts
index 82f24c93..c4dcbb87 100644
--- a/subprojects/frontend/src/editor/exposeDiagnostics.ts
+++ b/subprojects/frontend/src/editor/exposeDiagnostics.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { setDiagnosticsEffect } from '@codemirror/lint';
 import {
   StateField,
diff --git a/subprojects/frontend/src/editor/findOccurrences.ts b/subprojects/frontend/src/editor/findOccurrences.ts
index 08c078c2..00dffc96 100644
--- a/subprojects/frontend/src/editor/findOccurrences.ts
+++ b/subprojects/frontend/src/editor/findOccurrences.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import {
   type Range,
   RangeSet,
diff --git a/subprojects/frontend/src/editor/indentationMarkerViewPlugin.ts b/subprojects/frontend/src/editor/indentationMarkerViewPlugin.ts
index 730fa6e3..57a946d5 100644
--- a/subprojects/frontend/src/editor/indentationMarkerViewPlugin.ts
+++ b/subprojects/frontend/src/editor/indentationMarkerViewPlugin.ts
@@ -1,10 +1,16 @@
+/*
+ * Copyright (c) 2022 Replit
+ * Copyright (c) 2022-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: MIT OR EPL-2.0
+ */
+
 /**
  * @file CodeMirror plugin to highlight indentation
  *
  * This file is based on the
  * [@replit/codemirror-indentation-markers](https://github.com/replit/codemirror-indentation-markers)
- * package, which is available under the
- * [MIT License](https://github.com/replit/codemirror-indentation-markers/blob/543cc508ca5cef5d8350af23973eb1425e31525c/LICENSE).
+ * package.
  *
  * The highlighting heuristics were adjusted to make them more suitable
  * for logic programming.
diff --git a/subprojects/frontend/src/editor/scrollbarViewPlugin.ts b/subprojects/frontend/src/editor/scrollbarViewPlugin.ts
index f44034fd..878d369d 100644
--- a/subprojects/frontend/src/editor/scrollbarViewPlugin.ts
+++ b/subprojects/frontend/src/editor/scrollbarViewPlugin.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { EditorSelection } from '@codemirror/state';
 import {
   type EditorView,
diff --git a/subprojects/frontend/src/editor/semanticHighlighting.ts b/subprojects/frontend/src/editor/semanticHighlighting.ts
index 2c1bd67d..1f2e564c 100644
--- a/subprojects/frontend/src/editor/semanticHighlighting.ts
+++ b/subprojects/frontend/src/editor/semanticHighlighting.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { RangeSet, type TransactionSpec } from '@codemirror/state';
 import { Decoration } from '@codemirror/view';
 
diff --git a/subprojects/frontend/src/index.tsx b/subprojects/frontend/src/index.tsx
index 29b2b196..cb11e6c3 100644
--- a/subprojects/frontend/src/index.tsx
+++ b/subprojects/frontend/src/index.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { configure } from 'mobx';
 import { type Root, createRoot } from 'react-dom/client';
 
diff --git a/subprojects/frontend/src/language/folding.ts b/subprojects/frontend/src/language/folding.ts
index 4dabfa27..b4d4ca22 100644
--- a/subprojects/frontend/src/language/folding.ts
+++ b/subprojects/frontend/src/language/folding.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type { EditorState } from '@codemirror/state';
 import type { SyntaxNode } from '@lezer/common';
 
diff --git a/subprojects/frontend/src/language/indentation.ts b/subprojects/frontend/src/language/indentation.ts
index a0f7032d..8446d7fa 100644
--- a/subprojects/frontend/src/language/indentation.ts
+++ b/subprojects/frontend/src/language/indentation.ts
@@ -1,3 +1,10 @@
+/*
+ * Copyright (C) 2018-2021 by Marijn Haverbeke <marijnh@gmail.com> and others
+ * Copyright (C) 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: MIT OR EPL-2.0
+ */
+
 import type { TreeIndentContext } from '@codemirror/language';
 
 /**
diff --git a/subprojects/frontend/src/language/problem.grammar b/subprojects/frontend/src/language/problem.grammar
index 704badab..a7b1fb0a 100644
--- a/subprojects/frontend/src/language/problem.grammar
+++ b/subprojects/frontend/src/language/problem.grammar
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 @detectDelim
 
 @external prop implicitCompletion from './props'
diff --git a/subprojects/frontend/src/language/problemLanguageSupport.ts b/subprojects/frontend/src/language/problemLanguageSupport.ts
index c3ae7ed9..2121e05f 100644
--- a/subprojects/frontend/src/language/problemLanguageSupport.ts
+++ b/subprojects/frontend/src/language/problemLanguageSupport.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import {
   foldInside,
   foldNodeProp,
diff --git a/subprojects/frontend/src/language/props.ts b/subprojects/frontend/src/language/props.ts
index 65392e75..aa67145a 100644
--- a/subprojects/frontend/src/language/props.ts
+++ b/subprojects/frontend/src/language/props.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 /* eslint-disable import/prefer-default-export -- Lezer needs non-default exports */
 
 import { NodeProp } from '@lezer/common';
diff --git a/subprojects/frontend/src/theme/ThemeProvider.tsx b/subprojects/frontend/src/theme/ThemeProvider.tsx
index ff97d524..740e9562 100644
--- a/subprojects/frontend/src/theme/ThemeProvider.tsx
+++ b/subprojects/frontend/src/theme/ThemeProvider.tsx
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import {
   alpha,
   createTheme,
diff --git a/subprojects/frontend/src/theme/ThemeStore.ts b/subprojects/frontend/src/theme/ThemeStore.ts
index e09d8d99..7c657449 100644
--- a/subprojects/frontend/src/theme/ThemeStore.ts
+++ b/subprojects/frontend/src/theme/ThemeStore.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { makeAutoObservable } from 'mobx';
 
 export enum ThemePreference {
diff --git a/subprojects/frontend/src/utils/CancelledError.ts b/subprojects/frontend/src/utils/CancelledError.ts
index ee23676f..96b67af7 100644
--- a/subprojects/frontend/src/utils/CancelledError.ts
+++ b/subprojects/frontend/src/utils/CancelledError.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 export default class CancelledError extends Error {
   constructor(message = 'Operation cancelled') {
     super(message);
diff --git a/subprojects/frontend/src/utils/PendingTask.ts b/subprojects/frontend/src/utils/PendingTask.ts
index d0b24c1f..80d1a346 100644
--- a/subprojects/frontend/src/utils/PendingTask.ts
+++ b/subprojects/frontend/src/utils/PendingTask.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import TimeoutError from './TimeoutError';
 import getLogger from './getLogger';
 
diff --git a/subprojects/frontend/src/utils/PriorityMutex.ts b/subprojects/frontend/src/utils/PriorityMutex.ts
index 78736141..c1215c76 100644
--- a/subprojects/frontend/src/utils/PriorityMutex.ts
+++ b/subprojects/frontend/src/utils/PriorityMutex.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import CancelledError from './CancelledError';
 import PendingTask from './PendingTask';
 import getLogger from './getLogger';
diff --git a/subprojects/frontend/src/utils/TimeoutError.ts b/subprojects/frontend/src/utils/TimeoutError.ts
index eb800f40..21365502 100644
--- a/subprojects/frontend/src/utils/TimeoutError.ts
+++ b/subprojects/frontend/src/utils/TimeoutError.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 export default class TimeoutError extends Error {
   constructor() {
     super('Operation timed out');
diff --git a/subprojects/frontend/src/utils/getLogger.ts b/subprojects/frontend/src/utils/getLogger.ts
index 301fd76d..09b0b17f 100644
--- a/subprojects/frontend/src/utils/getLogger.ts
+++ b/subprojects/frontend/src/utils/getLogger.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import styles, { type CSPair } from 'ansi-styles';
 import log from 'loglevel';
 import prefix from 'loglevel-plugin-prefix';
diff --git a/subprojects/frontend/src/utils/useDelayedSnackbar.ts b/subprojects/frontend/src/utils/useDelayedSnackbar.ts
index 03ad6caa..3d6df3e3 100644
--- a/subprojects/frontend/src/utils/useDelayedSnackbar.ts
+++ b/subprojects/frontend/src/utils/useDelayedSnackbar.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import {
   useSnackbar,
   type SnackbarKey,
diff --git a/subprojects/frontend/src/xtext/BackendConfig.ts b/subprojects/frontend/src/xtext/BackendConfig.ts
index 41737c0b..4c7eac5f 100644
--- a/subprojects/frontend/src/xtext/BackendConfig.ts
+++ b/subprojects/frontend/src/xtext/BackendConfig.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 /* eslint-disable @typescript-eslint/no-redeclare -- Declare types with their companion objects */
 
 import { z } from 'zod';
diff --git a/subprojects/frontend/src/xtext/ContentAssistService.ts b/subprojects/frontend/src/xtext/ContentAssistService.ts
index 78f61c06..fd30c4f9 100644
--- a/subprojects/frontend/src/xtext/ContentAssistService.ts
+++ b/subprojects/frontend/src/xtext/ContentAssistService.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type {
   Completion,
   CompletionContext,
diff --git a/subprojects/frontend/src/xtext/HighlightingService.ts b/subprojects/frontend/src/xtext/HighlightingService.ts
index a126ee40..447f1401 100644
--- a/subprojects/frontend/src/xtext/HighlightingService.ts
+++ b/subprojects/frontend/src/xtext/HighlightingService.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type EditorStore from '../editor/EditorStore';
 import type { IHighlightRange } from '../editor/semanticHighlighting';
 
diff --git a/subprojects/frontend/src/xtext/OccurrencesService.ts b/subprojects/frontend/src/xtext/OccurrencesService.ts
index fc72ead2..c9c6c699 100644
--- a/subprojects/frontend/src/xtext/OccurrencesService.ts
+++ b/subprojects/frontend/src/xtext/OccurrencesService.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type { Transaction } from '@codemirror/state';
 import { debounce } from 'lodash-es';
 import ms from 'ms';
diff --git a/subprojects/frontend/src/xtext/UpdateService.ts b/subprojects/frontend/src/xtext/UpdateService.ts
index 63e28652..ee5ebde2 100644
--- a/subprojects/frontend/src/xtext/UpdateService.ts
+++ b/subprojects/frontend/src/xtext/UpdateService.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type { ChangeDesc, Transaction } from '@codemirror/state';
 import { debounce } from 'lodash-es';
 import { nanoid } from 'nanoid';
diff --git a/subprojects/frontend/src/xtext/UpdateStateTracker.ts b/subprojects/frontend/src/xtext/UpdateStateTracker.ts
index 5d4ce49e..4ce93ed6 100644
--- a/subprojects/frontend/src/xtext/UpdateStateTracker.ts
+++ b/subprojects/frontend/src/xtext/UpdateStateTracker.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import {
   type ChangeDesc,
   ChangeSet,
diff --git a/subprojects/frontend/src/xtext/ValidationService.ts b/subprojects/frontend/src/xtext/ValidationService.ts
index 72414590..64fb63eb 100644
--- a/subprojects/frontend/src/xtext/ValidationService.ts
+++ b/subprojects/frontend/src/xtext/ValidationService.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type { Diagnostic } from '@codemirror/lint';
 
 import type EditorStore from '../editor/EditorStore';
diff --git a/subprojects/frontend/src/xtext/XtextClient.ts b/subprojects/frontend/src/xtext/XtextClient.ts
index 14fb2430..e8181af0 100644
--- a/subprojects/frontend/src/xtext/XtextClient.ts
+++ b/subprojects/frontend/src/xtext/XtextClient.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import type {
   CompletionContext,
   CompletionResult,
diff --git a/subprojects/frontend/src/xtext/XtextWebSocketClient.ts b/subprojects/frontend/src/xtext/XtextWebSocketClient.ts
index 6b734546..6bb7eec8 100644
--- a/subprojects/frontend/src/xtext/XtextWebSocketClient.ts
+++ b/subprojects/frontend/src/xtext/XtextWebSocketClient.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import { createAtom, makeAutoObservable, observable } from 'mobx';
 import ms from 'ms';
 import { nanoid } from 'nanoid';
diff --git a/subprojects/frontend/src/xtext/fetchBackendConfig.ts b/subprojects/frontend/src/xtext/fetchBackendConfig.ts
index 15e976d8..71ff2e63 100644
--- a/subprojects/frontend/src/xtext/fetchBackendConfig.ts
+++ b/subprojects/frontend/src/xtext/fetchBackendConfig.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import BackendConfig, { ENDPOINT } from './BackendConfig';
 
 export default async function fetchBackendConfig(): Promise<BackendConfig> {
diff --git a/subprojects/frontend/src/xtext/webSocketMachine.ts b/subprojects/frontend/src/xtext/webSocketMachine.ts
index fc53fef3..2fb1f52f 100644
--- a/subprojects/frontend/src/xtext/webSocketMachine.ts
+++ b/subprojects/frontend/src/xtext/webSocketMachine.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import ms from 'ms';
 import { actions, assign, createMachine } from 'xstate';
 
diff --git a/subprojects/frontend/src/xtext/xtextMessages.ts b/subprojects/frontend/src/xtext/xtextMessages.ts
index ec7a2a31..bbbff064 100644
--- a/subprojects/frontend/src/xtext/xtextMessages.ts
+++ b/subprojects/frontend/src/xtext/xtextMessages.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 /* eslint-disable @typescript-eslint/no-redeclare -- Declare types with their companion objects */
 
 import { z } from 'zod';
diff --git a/subprojects/frontend/src/xtext/xtextServiceResults.ts b/subprojects/frontend/src/xtext/xtextServiceResults.ts
index e93c6714..d3b467ad 100644
--- a/subprojects/frontend/src/xtext/xtextServiceResults.ts
+++ b/subprojects/frontend/src/xtext/xtextServiceResults.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 /* eslint-disable @typescript-eslint/no-redeclare -- Declare types with their companion objects */
 
 import { z } from 'zod';
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,
diff --git a/subprojects/frontend/tsconfig.json b/subprojects/frontend/tsconfig.json
index 35d0d164..06f6d8fe 100644
--- a/subprojects/frontend/tsconfig.json
+++ b/subprojects/frontend/tsconfig.json
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
 {
   "extends": "./tsconfig.base.json",
   "compilerOptions": {
diff --git a/subprojects/frontend/tsconfig.node.json b/subprojects/frontend/tsconfig.node.json
index cfa2da13..47feaf97 100644
--- a/subprojects/frontend/tsconfig.node.json
+++ b/subprojects/frontend/tsconfig.node.json
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
 {
   "extends": "./tsconfig.base.json",
   "compilerOptions": {
diff --git a/subprojects/frontend/tsconfig.shared.json b/subprojects/frontend/tsconfig.shared.json
index f7b56a1d..154fe122 100644
--- a/subprojects/frontend/tsconfig.shared.json
+++ b/subprojects/frontend/tsconfig.shared.json
@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
 {
   "extends": "./tsconfig.base.json",
   "compilerOptions": {
@@ -6,6 +11,6 @@
     "types": [],
   },
   "include": [
-    "src/xtext/BackendConfig.ts",
+    "src/xtext/BackendConfig.ts"
   ]
 }
diff --git a/subprojects/frontend/types/ImportMeta.d.ts b/subprojects/frontend/types/ImportMeta.d.ts
index c32b48f5..f5a32ef1 100644
--- a/subprojects/frontend/types/ImportMeta.d.ts
+++ b/subprojects/frontend/types/ImportMeta.d.ts
@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) 2019-present, Yuxi (Evan) You and Vite contributors
+ * Copyright (c) 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: MIT OR EPL-2.0
+ */
+
 interface ImportMeta {
   env: {
     BASE_URL: string;
diff --git a/subprojects/frontend/types/grammar.d.ts b/subprojects/frontend/types/grammar.d.ts
index 1480085b..e7a7eebf 100644
--- a/subprojects/frontend/types/grammar.d.ts
+++ b/subprojects/frontend/types/grammar.d.ts
@@ -1,3 +1,10 @@
+/*
+ * Copyright (C) 2018 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+ * Copyright (C) 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: MIT OR EPL-2.0
+ */
+
 declare module '*.grammar' {
   import type { LRParser } from '@lezer/lr';
 
diff --git a/subprojects/frontend/types/node/@lezer-generator-rollup.d.ts b/subprojects/frontend/types/node/@lezer-generator-rollup.d.ts
index 9c1ff03e..4ef9f4e3 100644
--- a/subprojects/frontend/types/node/@lezer-generator-rollup.d.ts
+++ b/subprojects/frontend/types/node/@lezer-generator-rollup.d.ts
@@ -1,3 +1,10 @@
+/*
+ * Copyright (C) 2018 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+ * Copyright (C) 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: MIT OR EPL-2.0
+ */
+
 // We have to explicitly redeclare the type of the `./rollup` ESM export of `@lezer/generator`,
 // because TypeScript can't find it on its own even with `"moduleResolution": "Node16"`.
 declare module '@lezer/generator/rollup' {
diff --git a/subprojects/frontend/types/windowControlsOverlay.d.ts b/subprojects/frontend/types/windowControlsOverlay.d.ts
index d8f3182f..2513d620 100644
--- a/subprojects/frontend/types/windowControlsOverlay.d.ts
+++ b/subprojects/frontend/types/windowControlsOverlay.d.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 interface WindowControlsOverlayGeometryChangeEvent extends Event {
   titlebarAreaRect: DOMRect;
 
diff --git a/subprojects/frontend/vite.config.ts b/subprojects/frontend/vite.config.ts
index cd9993cc..9e08ccc4 100644
--- a/subprojects/frontend/vite.config.ts
+++ b/subprojects/frontend/vite.config.ts
@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';