Add license headers across the project

ts/util/lint/analyze_exceptions.ts

@@ -1,3 +1,6 @@
+// Copyright 2018-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 import { join } from 'path';
 
 import { fromPairs, groupBy, map } from 'lodash';

ts/util/lint/linter.ts

@@ -1,3 +1,6 @@
+// Copyright 2018-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /* eslint-disable no-console */
 import * as fs from 'fs';
 import { join, relative } from 'path';

ts/util/lint/sort_exceptions.ts

@@ -1,3 +1,6 @@
+// Copyright 2018-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 import { join } from 'path';
 import { writeFileSync } from 'fs';
 

ts/util/lint/types.ts

@@ -1,3 +1,6 @@
+// Copyright 2018-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 // Tool requirements:
 //   - Feed it a set of regular expressions with descriptions as to what the risks are
 //   - Feed it also a set of exceptions

ts/util/lint/util.ts

@@ -1,3 +1,6 @@
+// Copyright 2018-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /* eslint-disable no-console */
 
 import { readFileSync } from 'fs';