refactor: replace read-pkg-up with escalade (#187)

Ref https://packagephobia.com/result?p=read-pkg-up

read-pkg-up is quite big package with many dependencies. It solves cases not necessary for this project like pretty json errors and normalisation of package.json data.

In this diff I replaced it with dependency-free escalade and parsed json with native JSON.parse.

This will let users to have faster installation and less bloated node_modules.

lib/plugins/ramdisk.js

@@ -10,16 +10,36 @@
 */
 /* eslint-disable no-param-reassign */
 const crypto = require('crypto');
-const { symlinkSync } = require('fs');
+const { symlinkSync, readFileSync } = require('fs');
 const { basename, join, resolve } = require('path');
 
 const isCwd = require('is-path-cwd');
-const readPkgUp = require('read-pkg-up');
+const escalade = require('escalade/sync');
 const rm = require('rimraf');
 const { WebpackPluginRamdisk } = require('webpack-plugin-ramdisk');
 
 const { PluginExistsError, RamdiskPathError } = require('../errors');
 
+const readPkgName = () => {
+  const pkgPath = escalade(process.cwd(), (dir, names) => {
+    if (names.includes('package.json')) {
+      return 'package.json';
+    }
+    return false;
+  });
+  // istanbul ignore if
+  if (pkgPath == null) {
+    return null;
+  }
+  try {
+    const pkg = JSON.parse(readFileSync(pkgPath, 'utf-8'));
+    return pkg.name;
+  } catch (error) {
+    // istanbul ignore next
+    return null;
+  }
+};
+
 module.exports = {
   init(compiler, options) {
     const hasPlugin = compiler.options.plugins.some(
@@ -34,7 +54,7 @@ module.exports = {
       throw new PluginExistsError('WebpackRamdiskPlugin exists in the specified configuration.');
     }
 
-    const pkg = readPkgUp.sync() || {};
+    let pkgName = readPkgName();
     const { path } = compiler.options.output;
     const lastSegment = basename(path);
     const errorInfo = `The ramdisk option creates a symlink from \`output.path\`, to the ramdisk build output path, and must remove any existing \`output.path\` to do so.`;
@@ -61,14 +81,14 @@ module.exports = {
       );
     }
 
-    if (!pkg.name) {
+    if (!pkgName) {
       // use md5 for a short hash that'll be consistent between wps starts
       const md5 = crypto.createHash('md5');
       md5.update(path);
-      pkg.name = md5.digest('hex');
+      pkgName = md5.digest('hex');
     }
 
-    const newPath = join(pkg.name, lastSegment);
+    const newPath = join(pkgName, lastSegment);
 
     // clean up the output path in prep for the ramdisk plugin
     compiler.options.output.path = newPath;

package.json

@@ -40,6 +40,7 @@
   "dependencies": {
     "chalk": "^4.0.0",
     "connect-history-api-fallback": "^1.5.0",
+    "escalade": "^3.1.0",
     "globby": "^11.0.0",
     "http-proxy-middleware": "^1.0.3",
     "is-path-cwd": "^2.2.0",
@@ -54,7 +55,6 @@
     "onetime": "^5.1.0",
     "open": "^7.0.3",
     "p-defer": "^3.0.0",
-    "read-pkg-up": "^7.0.1",
     "rimraf": "^3.0.2",
     "strip-ansi": "^6.0.0",
     "superstruct": "^0.10.12",

test/fixtures/ramdisk-empty-pkg/app.js

@@ -0,0 +1,2 @@
+const main = document.querySelector('main');
+main.innerHTML = 'main';

test/fixtures/ramdisk-empty-pkg/package.json

@@ -0,0 +1 @@
+{}

test/fixtures/ramdisk-empty-pkg/webpack.config.js

@@ -0,0 +1,29 @@
+const { resolve } = require('path');
+
+const getPort = require('get-port');
+
+const { WebpackPluginServe: Serve } = require('../../../lib/');
+
+module.exports = {
+  context: __dirname,
+  entry: ['./app.js', 'webpack-plugin-serve/client'],
+  mode: 'development',
+  output: {
+    filename: './output.js',
+    path: resolve(__dirname, './output'),
+    publicPath: 'output/'
+  },
+  plugins: [
+    new Serve({
+      host: 'localhost',
+      port: getPort({ port: 55555 }),
+      ramdisk: true
+    })
+  ],
+  resolve: {
+    alias: {
+      'webpack-plugin-serve/client': resolve(__dirname, '../../../client')
+    }
+  },
+  watch: true
+};