Add plugin contribution

scripts/plugin-contribution.js

@@ -0,0 +1,130 @@
+#!/usr/bin/env node
+
+const fs = require("fs");
+const path = require("path");
+const {transform} = require("babel-core");
+const Table = require("cli-table");
+const zlib = require("zlib");
+
+run(process.argv[2]);
+
+function run(inputFile) {
+  const input = fs.readFileSync(inputFile).toString();
+  const table = new Table(Object.assign({
+    head: [
+      "name",
+      "output(bytes)",
+      "output gzip(bytes)",
+      "raw compression (%)",
+      "gzip win (%)",
+      "gzip % (%)"
+    ],
+  }, tableStyle()));
+
+  const baseOutput = transform(input, {
+    minified: true,
+    compact: true,
+    comments: false,
+  }).code;
+
+  const baseGzip = zlib.gzipSync(baseOutput);
+
+  getPlugins().forEach(({name, plugin}) => {
+    const output = transform(baseOutput, {
+      plugins: [plugin],
+      minified: true,
+      compact: true,
+      comments: false,
+    }).code;
+
+    const gzippedOutput = zlib.gzipSync(output);
+
+    const percentage = (1 - len(output) / len(baseOutput)) * 100;
+    const gzipWin = (1 - len(gzippedOutput) / len(baseGzip)) * 100;
+    const gzipPercentage = (1 - len(gzippedOutput) / len(output)) * 100;
+
+    table.push([
+      name.split("babel-plugin-")[1],
+      len(output),
+      len(gzippedOutput),
+      percentage.toFixed(3),
+      gzipWin.toFixed(3),
+      gzipPercentage.toFixed(3),
+    ]);
+  });
+
+  const wcWin = (1 - len(baseOutput) / len(input)) * 100;
+
+  console.log(`
+input: input file with white space and comments removed
+
+input size (bytes)      : ${len(baseOutput)}
+input gzip size (bytes) : ${len(baseGzip)}
+
+raw compression : % decrease from input -> output
+gzip win        : % decrease from gzipInput -> gzipOutput
+gzip %          : % decrease from output -> gzipOutput
+
+Whitespaces and comments win (raw compression): ${wcWin}
+`);
+
+  console.log(table.toString());
+}
+
+function getPlugins() {
+  return fs.readdirSync(path.join(__dirname, "../packages"))
+    .filter((dir) => {
+      if (!isDir(path.join(__dirname, "../packages", dir))) return false;
+      if (dir.indexOf("babel-plugin-") !== 0) return false;
+      try {
+        require(`../packages/${dir}`);
+        return true;
+      } catch (e) {
+        return false;
+      }
+    })
+    .map((pluginName) => ({
+      name: pluginName,
+      plugin: require(`../packages/${pluginName}`)
+    }));
+}
+
+function isDir(p) {
+  try {
+    return fs.statSync(p).isDirectory();
+  } catch (e) {
+    return false;
+  }
+}
+
+function len(str) {
+  return Buffer.byteLength(str, "utf-8");
+}
+
+// just to keep it at the bottom
+function tableStyle() {
+  return {
+    chars: {
+      top: "",
+      "top-mid": "" ,
+      "top-left": "" ,
+      "top-right": "",
+      bottom: "" ,
+      "bottom-mid": "" ,
+      "bottom-left": "" ,
+      "bottom-right": "",
+      left: "",
+      "left-mid": "",
+      mid: "",
+      "mid-mid": "",
+      right: "" ,
+      "right-mid": "",
+      middle: " ",
+    },
+    style: {
+      "padding-left": 0,
+      "padding-right": 0,
+      head: ["bold"],
+    }
+  };
+}