Replace the junky string concat with a nicer .cjs prebuid script

.gitignore

@@ -106,4 +106,4 @@ lib/**/*
 # Nix builds
 result
 
-src/package.ts
+src/version.generated.ts

package.json

@@ -10,7 +10,7 @@
     "check-fmt": "prettier --check .",
     "format": "prettier --write .",
     "lint": "eslint src/**/*.ts",
-    "prebuild": "echo 'export const pkg =' > src/package.ts; cat package.json >> ./src/package.ts && prettier --write ./src/package.ts && eslint --fix ./src/package.ts",
+    "prebuild": "pnpm exec node ./scripts/prebuild.cjs",
     "docs": "pnpm run prebuild && typedoc src/main.ts",
     "all": "pnpm run prebuild && pnpm run format && pnpm run lint && pnpm run build"
   },

scripts/prebuild.cjs

@@ -0,0 +1,7 @@
+const fs = require("node:fs/promises");
+
+const json = require("../package.json");
+fs.writeFile(
+  "./src/version.generated.ts",
+  `export const version = "${json.version}";\n`,
+);

src/main.ts

@@ -4,9 +4,9 @@
  */
 import * as ghActionsCorePlatform from "./actions-core-platform.js";
 import * as correlation from "./correlation.js";
-import { pkg } from "./package.js";
 import * as platform from "./platform.js";
 import { SourceDef, constructSourceParameters } from "./sourcedef.js";
+import { version as pkg_version } from "./version.generated.js";
 import * as actionsCache from "@actions/cache";
 import * as actionsCore from "@actions/core";
 import got, { Got } from "got";
@@ -121,7 +121,7 @@ export class IdsToolbox {
 
     this.facts = {
       $lib: "idslib",
-      $lib_version: pkg.version,
+      $lib_version: pkg_version,
       project: this.actionOptions.name,
       ids_project: this.actionOptions.idsProjectName,
     };