correctly copy over package.json file in the explorer-helpers package (…

…#246)

packages/explorer-helpers/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 mayakoneval
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

packages/explorer-helpers/package.json

@@ -21,7 +21,7 @@
   },
   "scripts": {
     "build": "npm run build:cjs-esm",
-    "build:cjs-esm": "rm -rf dist && rollup -c rollup.cjs-esm.config.js && cp src/index.cjs dist/index.cjs",
+    "build:cjs-esm": "rm -rf dist && rollup -c rollup.cjs-esm.config.js && cp src/index.cjs dist/index.cjs  && node ./prepareDist.js",
     "lint": "eslint --ext .js,.jsx,.ts,.tsx .",
     "size": "size-limit",
     "analyze": "size-limit --why",

packages/explorer-helpers/prepareDist.js

@@ -0,0 +1,37 @@
+const fs = require('fs-extra');
+
+// We copy the package.json to the dist folder, since when we publish we
+// publish from inside the dist folder (see prepareForPublish node script).
+const packageJson = require('./package.json');
+packageJson.type = 'module';
+
+// Remove package.json items that we don't need to publish
+delete packageJson.scripts;
+delete packageJson.bundlesize;
+delete packageJson.engines;
+
+// The root package.json points to the CJS/ESM source in "dist", to support
+// on-going package development (e.g. running tests, supporting npm link, etc.).
+// When publishing from "dist" however, we need to update the package.json
+// to point to the files within the same directory.
+const distPackageJson =
+  JSON.stringify(
+    packageJson,
+    (_key, value) => {
+      if (typeof value === 'string' && value.startsWith('dist/')) {
+        const parts = value.split('/');
+        parts.splice(0, 1); // remove dist
+        return './' + parts.join('/');
+      }
+      return value;
+    },
+    2
+  ) + '\n';
+
+// Save the modified package.json to "dist"
+fs.writeFileSync(`./dist/package.json`, distPackageJson);
+
+// Copy supporting files into "dist"
+const destDir = `dist`;
+fs.copyFileSync(`README.md`, `${destDir}/README.md`);
+fs.copyFileSync(`LICENSE`, `${destDir}/LICENSE`);