Convert package-fixup script to typescript

Author: andrewMacmurray

package.json

@@ -22,7 +22,8 @@
     "review": "elm-review --fix",
     "review:ci": "elm-review",
     "review:watch": "elm-review --watch",
-    "runner:compile": "rm -rf lib/* && tsc -p tsconfig-mjs.json && tsc -p tsconfig-cjs.json && ./scripts/package-fixup.sh",
+    "runner:sub-package-json": "node --experimental-strip-types ./scripts/package-fixup.mts",
+    "runner:compile": "rm -rf lib/* && tsc -p tsconfig-mjs.json && tsc -p tsconfig-cjs.json && npm run runner:sub-package-json",
     "check-versions": "node --experimental-strip-types ./scripts/versions.mts"
   },
   "author": "Andrew MacMurray",

scripts/package-fixup.mts

@@ -0,0 +1,14 @@
+import fs from "node:fs/promises";
+
+// Adds package.json files to cjs/mjs subtrees
+
+const writePackageJson = (path: string, contents: Record<string, string>) => {
+  return fs.writeFile(`${path}/package.json`, JSON.stringify(contents, null, 2));
+};
+
+Promise.all([
+  writePackageJson("lib/cjs", { type: "commonjs" }),
+  writePackageJson("lib/mjs", { type: "module" }),
+]).then(() => {
+  console.log("Wrote sub package JSONs for compiled runners ✅");
+});