fix: ensure package.json entries are in a reasonable order

lib/package_json.test.ts

@@ -468,38 +468,46 @@ Deno.test("peer dependencies", () => {
     },
   };
 
-  assertEquals(getPackageJson(props), {
-    name: "package",
-    version: "0.1.0",
-    main: "./script/mod.js",
-    module: "./esm/mod.js",
-    types: "./types/mod.d.ts",
-    dependencies: {
-      dep: "^1.0.0",
-    },
-    peerDependencies: {
-      peerDep: "^2.0.0",
-    },
-    devDependencies: {
-      "@types/node": versions.nodeTypes,
-      "picocolors": versions.picocolors,
-      "test-dep": "0.1.0",
-      "@deno/shim-deno": "~0.1.0",
-    },
-    exports: {
-      ".": {
-        import: {
-          types: "./types/mod.d.ts",
-          default: "./esm/mod.js",
+  // the stringify ensures that the order looks ok as well
+  assertEquals(
+    JSON.stringify(getPackageJson(props), null, 2),
+    JSON.stringify(
+      {
+        name: "package",
+        version: "0.1.0",
+        main: "./script/mod.js",
+        module: "./esm/mod.js",
+        types: "./types/mod.d.ts",
+        exports: {
+          ".": {
+            import: {
+              types: "./types/mod.d.ts",
+              default: "./esm/mod.js",
+            },
+            require: {
+              types: "./types/mod.d.ts",
+              default: "./script/mod.js",
+            },
+          },
         },
-        require: {
-          types: "./types/mod.d.ts",
-          default: "./script/mod.js",
+        scripts: {
+          test: "node test_runner.js",
+        },
+        dependencies: {
+          dep: "^1.0.0",
+        },
+        peerDependencies: {
+          peerDep: "^2.0.0",
+        },
+        devDependencies: {
+          "@types/node": versions.nodeTypes,
+          "picocolors": versions.picocolors,
+          "test-dep": "0.1.0",
+          "@deno/shim-deno": "~0.1.0",
         },
       },
-    },
-    scripts: {
-      test: "node test_runner.js",
-    },
-  });
+      null,
+      2,
+    ),
+  );
 });

lib/package_json.ts

@@ -107,7 +107,7 @@ export function getPackageJson({
     }
     : {};
 
-  return {
+  const final: Record<string, unknown> = {
     ...mainExport,
     ...binaryExport,
     ...packageJsonObj,
@@ -151,6 +151,7 @@ export function getPackageJson({
       devDependencies,
     }),
   };
+  return sortObject(final);
 
   function shouldIncludeTypesNode() {
     if (Object.keys(dependencies).includes("@types/node")) {
@@ -183,3 +184,46 @@ export function getPackageJson({
     return obj;
   }
 }
+
+function sortObject(obj: Record<string, unknown>) {
+  const highPrecedence = [
+    "name",
+    "version",
+    "description",
+    "keywords",
+    "author",
+    "homepage",
+    "repository",
+    "license",
+    "bugs",
+    "main",
+    "module",
+    "types",
+    "typings",
+    "exports",
+    "scripts",
+  ];
+  const lowPrecedence = ["dependencies", "peerDependencies", "devDependencies"];
+  const sortedObj: Record<string, unknown> = {};
+  const finalEntries: Record<string, unknown> = {};
+  for (const key of highPrecedence) {
+    if (key in obj) {
+      sortedObj[key] = obj[key];
+      delete obj[key];
+    }
+  }
+  for (const key of lowPrecedence) {
+    if (key in obj) {
+      finalEntries[key] = obj[key];
+      delete obj[key];
+    }
+  }
+  for (const key of Object.keys(obj)) {
+    sortedObj[key] = obj[key];
+  }
+  for (const [key, value] of Object.entries(finalEntries)) {
+    sortedObj[key] = value;
+  }
+
+  return sortedObj;
+}