fix(deno): Add prepack for deno build (#12700)

fixes #12698

Adds back prepack script just for deno which was removed in
#12656 because it's a
breaking change for the deno package which relies on the directory
structure for their import path.

Author: AbhiPrasad

packages/deno/package.json

@@ -41,9 +41,9 @@
     "build:types": "run-s deno-types build:types:tsc build:types:bundle",
     "build:types:tsc": "tsc -p tsconfig.types.json",
     "build:types:bundle": "rollup -c rollup.types.config.mjs",
-    "build:tarball": "npm pack",
+    "build:tarball": "node ./scripts/prepack.js && npm pack",
     "circularDepCheck": "madge --circular src/index.ts",
-    "clean": "rimraf build build-types build-test coverage",
+    "clean": "rimraf build build-types build-test coverage sentry-deno-*.tgz",
     "prefix": "yarn deno-types",
     "fix": "eslint . --format stylish --fix",
     "prelint": "yarn deno-types",
@@ -55,7 +55,7 @@
     "test:types": "deno check ./build/index.mjs",
     "test:unit": "deno test --allow-read --allow-run",
     "test:unit:update": "deno test --allow-read --allow-write --allow-run -- --update",
-    "yalc:publish": "yalc publish --push --sig"
+    "yalc:publish": "node ./scripts/prepack.js && yalc publish --push --sig"
   },
   "volta": {
     "extends": "../../package.json"

packages/deno/scripts/prepack.js

@@ -0,0 +1,111 @@
+/* eslint-disable no-console */
+
+/**
+ * This script prepares the central `build` directory for NPM package creation.
+ * It first copies all non-code files into the `build` directory, including `package.json`, which
+ * is edited to adjust entry point paths. These corrections are performed so that the paths align with
+ * the directory structure inside `build`.
+ *
+ * TODO(v9): Remove this script and change the Deno SDK to import from build/X.
+ */
+
+const fs = require('node:fs');
+const path = require('node:path');
+
+const BUILD_DIR = 'build';
+
+const ENTRY_POINTS = ['main', 'module', 'types', 'browser'];
+const EXPORT_MAP_ENTRY_POINT = 'exports';
+const TYPES_VERSIONS_ENTRY_POINT = 'typesVersions';
+
+const PACKAGE_JSON = 'package.json';
+
+/**
+ * @typedef {Record<(typeof ENTRY_POINTS)[number], string>} PackageJsonEntryPoints - an object containing module details
+ */
+
+/**
+ * @typedef {Record<string, string>} ConditionalExportEntryPoints - an object containing module details
+ */
+
+/**
+ * @typedef {Record<string, Record<string, string[]>>} TypeVersions - an object containing module details
+ */
+
+/**
+ * @typedef {Partial<ConditionalExportEntryPoints> & Record<string, Partial<ConditionalExportEntryPoints>>} PackageJsonExports - types for `package.json` exports
+ */
+
+/**
+ * @typedef {Record<string, unknown> & PackageJsonEntryPoints & {[EXPORT_MAP_ENTRY_POINT]: PackageJsonExports} & {[TYPES_VERSIONS_ENTRY_POINT]: TypeVersions}} PackageJson - types for `package.json`
+ */
+
+/**
+ * @type {PackageJson}
+ */
+const pkgJson = require(path.resolve(PACKAGE_JSON));
+
+// check if build dir exists
+if (!fs.existsSync(path.resolve(BUILD_DIR))) {
+  console.error(`\nERROR: Directory '${BUILD_DIR}' does not exist in ${pkgJson.name}.`);
+  console.error("This script should only be executed after you've run `yarn build`.");
+  process.exit(1);
+}
+
+// package.json modifications
+/**
+ * @type {PackageJson}
+ */
+const newPkgJson = { ...pkgJson };
+
+// modify entry points to point to correct paths (i.e. strip out the build directory)
+ENTRY_POINTS.filter(entryPoint => newPkgJson[entryPoint]).forEach(entryPoint => {
+  newPkgJson[entryPoint] = newPkgJson[entryPoint].replace(`${BUILD_DIR}/`, '');
+});
+
+/**
+ * Recursively traverses the exports object and rewrites all string values to remove the build directory.
+ *
+ * @param {PackageJsonExports} exportsObject - the exports object to traverse
+ * @param {string} key - the key of the current exports object
+ */
+function rewriteConditionalExportEntryPoint(exportsObject, key) {
+  const exportsField = exportsObject[key];
+  if (!exportsField) {
+    return;
+  }
+
+  if (typeof exportsField === 'string') {
+    exportsObject[key] = exportsField.replace(`${BUILD_DIR}/`, '');
+    return;
+  }
+  Object.keys(exportsField).forEach(subfieldKey => {
+    rewriteConditionalExportEntryPoint(exportsField, subfieldKey);
+  });
+}
+
+if (newPkgJson[EXPORT_MAP_ENTRY_POINT]) {
+  Object.keys(newPkgJson[EXPORT_MAP_ENTRY_POINT]).forEach(key => {
+    rewriteConditionalExportEntryPoint(newPkgJson[EXPORT_MAP_ENTRY_POINT], key);
+  });
+}
+
+if (newPkgJson[TYPES_VERSIONS_ENTRY_POINT]) {
+  Object.entries(newPkgJson[TYPES_VERSIONS_ENTRY_POINT]).forEach(([key, val]) => {
+    newPkgJson[TYPES_VERSIONS_ENTRY_POINT][key] = Object.entries(val).reduce((acc, [key, val]) => {
+      const newKey = key.replace(`${BUILD_DIR}/`, '');
+      acc[newKey] = val.map(v => v.replace(`${BUILD_DIR}/`, ''));
+      return acc;
+    }, {});
+  });
+}
+
+const newPackageJsonPath = path.resolve(BUILD_DIR, PACKAGE_JSON);
+
+// write modified package.json to file (pretty-printed with 2 spaces)
+try {
+  fs.writeFileSync(newPackageJsonPath, JSON.stringify(newPkgJson, null, 2));
+} catch (error) {
+  console.error(`\nERROR: Error while writing modified ${PACKAGE_JSON} to disk in ${pkgJson.name}:\n`, error);
+  process.exit(1);
+}