feat: Add @lerna/get-packed

utils/get-packed/README.md

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+# `@lerna/get-packed`
+
+> Read contents of package tarball created by npm pack
+
+## Usage
+
+```
+const getPacked = require('@lerna/get-packed');
+
+// TODO: DEMONSTRATE API
+```

utils/get-packed/__tests__/get-packed.test.js

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+"use strict";
+
+const getPacked = require("..");
+
+describe("@lerna/get-packed", () => {
+  it("needs tests", () => {
+    expect(getPacked).toBeDefined();
+  });
+});

utils/get-packed/lib/get-packed.js

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+"use strict";
+
+const fs = require("fs-extra");
+const path = require("path");
+const ssri = require("ssri");
+const tar = require("tar");
+
+module.exports = getPacked;
+
+function getPacked(pkg, tarFilePath) {
+  const bundledWanted = new Set(pkg.bundleDependencies || pkg.bundledDependencies || []);
+  const bundled = new Set();
+  const files = [];
+
+  let totalEntries = 0;
+  let totalEntrySize = 0;
+
+  return tar
+    .list({
+      file: tarFilePath,
+      onentry(entry) {
+        totalEntries += 1;
+        totalEntrySize += entry.size;
+
+        const p = entry.path;
+
+        if (p.startsWith("package/node_modules/")) {
+          const name = p.match(/^package\/node_modules\/((?:@[^/]+\/)?[^/]+)/)[1];
+
+          if (bundledWanted.has(name)) {
+            bundled.add(name);
+          }
+        } else {
+          files.push({
+            path: entry.path.replace(/^package\//, ""),
+            size: entry.size,
+            mode: entry.mode,
+          });
+        }
+      },
+      strip: 1,
+    })
+    .then(() =>
+      Promise.all([
+        fs.stat(tarFilePath),
+        ssri.fromStream(fs.createReadStream(tarFilePath), {
+          algorithms: ["sha1", "sha512"],
+        }),
+      ])
+    )
+    .then(([{ size }, { sha1, sha512 }]) => {
+      const shasum = sha1[0].hexDigest();
+
+      return {
+        id: `${pkg.name}@${pkg.version}`,
+        name: pkg.name,
+        version: pkg.version,
+        size,
+        unpackedSize: totalEntrySize,
+        shasum,
+        integrity: ssri.parse(sha512[0]),
+        filename: path.basename(tarFilePath),
+        files,
+        entryCount: totalEntries,
+        bundled: Array.from(bundled),
+      };
+    });
+}

utils/get-packed/package.json

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+{
+  "name": "@lerna/get-packed",
+  "version": "3.6.0",
+  "description": "Read contents of package tarball created by npm pack",
+  "keywords": [
+    "lerna",
+    "npm",
+    "pack",
+    "tarball"
+  ],
+  "author": "Daniel Stockman <[email protected]>",
+  "homepage": "https://github.com/lerna/lerna/tree/master/utils/get-packed#readme",
+  "license": "MIT",
+  "main": "lib/get-packed.js",
+  "files": [
+    "lib"
+  ],
+  "publishConfig": {
+    "access": "public"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/lerna/lerna.git"
+  },
+  "scripts": {
+    "test": "echo \"Error: run tests from root\" && exit 1"
+  },
+  "dependencies": {
+    "fs-extra": "^7.0.0",
+    "ssri": "^6.0.1",
+    "tar": "^4.4.8"
+  }
+}