Convert find-deadcode to a script

extensions/ql-vscode/package.json

@@ -1732,7 +1732,7 @@
     "format": "prettier --write **/*.{ts,tsx} && eslint . --ext .ts,.tsx --fix",
     "lint": "eslint . --ext .js,.ts,.tsx --max-warnings=0",
     "lint:markdown": "markdownlint-cli2 \"../../**/*.{md,mdx}\" \"!**/node_modules/**\" \"!**/.vscode-test/**\" \"!**/build/cli/v*/**\"",
-    "find-deadcode": "ts-unused-exports tsconfig.deadcode.json --showLineNumber --excludePathsFromReport=$(find src test -type f '(' -name jest.config.ts -or -name 'index.tsx' -or -name 'index.ts' ')' -print0 | tr '\\0' ';')'gulpfile.ts/;src/stories/;test/vscode-tests/jest-runner-installed-extensions.ts'",
+    "find-deadcode": "ts-node scripts/find-deadcode.ts",
     "format-staged": "lint-staged",
     "storybook": "storybook dev -p 6006",
     "build-storybook": "storybook build",

extensions/ql-vscode/scripts/find-deadcode.ts

@@ -0,0 +1,47 @@
+import { basename, join, relative, resolve } from "path";
+import analyzeTsConfig from "ts-unused-exports";
+import { containsPath, pathsEqual } from "../src/common/files";
+import { exit } from "process";
+
+function ignoreFile(file: string): boolean {
+  return (
+    containsPath("gulpfile.ts", file) ||
+    containsPath(join("src", "stories"), file) ||
+    pathsEqual(
+      join("test", "vscode-tests", "jest-runner-installed-extensions.ts"),
+      file,
+    ) ||
+    basename(file) === "jest.config.ts" ||
+    basename(file) === "index.tsx" ||
+    basename(file) === "index.ts"
+  );
+}
+
+function main() {
+  const repositoryRoot = resolve(join(__dirname, ".."));
+
+  const result = analyzeTsConfig("tsconfig.deadcode.json");
+  let foundUnusedExports = false;
+
+  for (const [filepath, exportNameAndLocations] of Object.entries(result)) {
+    const relativeFilepath = relative(repositoryRoot, filepath);
+
+    if (ignoreFile(relativeFilepath)) {
+      continue;
+    }
+
+    foundUnusedExports = true;
+
+    console.log(relativeFilepath);
+    for (const exportNameAndLocation of exportNameAndLocations) {
+      console.log(`    ${exportNameAndLocation.exportName}`);
+    }
+    console.log();
+  }
+
+  if (foundUnusedExports) {
+    exit(1);
+  }
+}
+
+main();