Drop core-js 2 support (#11751)

* breaking(preset-env): remove corejs 2 plugin

* test(preset-env): revise for corejs default value changes

* test(preset-env): remove unused core-js 2 tests

* breaking(transform-runtime): remove core-js 2 support

* test(transform-runtime): revise for core-js 3

* test(transform-runtime): remove core-js 2 related tests

* breaking(compat-data): remove core-js 2 compat data

* breaking: remove corejs2 compat data proxy

* chore: do not clean and force publish runtime-corejs2

* address review comments

* Update packages/babel-plugin-transform-runtime/src/index.js

Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>

Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>

Makefile

@@ -2,7 +2,7 @@ FLOW_COMMIT = a1f9a4c709dcebb27a5084acf47755fbae699c25
 TEST262_COMMIT = 058adfed86b1d4129996faaf50a85ea55379a66a
 TYPESCRIPT_COMMIT = ffa35d3272647fe48ddf173e1f0928f772c18630
 
-FORCE_PUBLISH = "@babel/runtime,@babel/runtime-corejs2,@babel/runtime-corejs3,@babel/standalone"
+FORCE_PUBLISH = "@babel/runtime,@babel/runtime-corejs3,@babel/standalone"
 
 # Fix color output until TravisCI fixes https://github.com/travis-ci/travis-ci/issues/7967
 export FORCE_COLOR = true
@@ -261,9 +261,7 @@ clean-lib:
 
 clean-runtime-helpers:
 	rm -f packages/babel-runtime/helpers/**/*.js
-	rm -f packages/babel-runtime-corejs2/helpers/**/*.js
 	rm -f packages/babel-runtime-corejs3/helpers/**/*.js
-	rm -rf packages/babel-runtime-corejs2/core-js
 
 clean-all:
 	rm -rf node_modules

packages/babel-compat-data/package.json

@@ -15,7 +15,6 @@
   "exports": {
     "./plugins": "./data/plugins.json",
     "./native-modules": "./data/native-modules.json",
-    "./corejs2-built-ins": "./data/corejs2-built-ins.json",
     "./corejs3-shipped-proposals": "./data/corejs3-shipped-proposals.json",
     "./overlapping-plugins": "./data/overlapping-plugins.json",
     "./plugin-bugfixes": "./data/plugin-bugfixes.json"

packages/babel-compat-data/scripts/build-data.js

@@ -4,28 +4,20 @@ const path = require("path");
 
 const { generateData, environments, writeFile } = require("./utils-build-data");
 
-for (const target of ["plugin", "corejs2-built-in"]) {
-  const newData = generateData(
-    environments,
-    require(`./data/${target}-features`)
-  );
-  if (target === "plugin") {
-    // add export-namespace-from from mdn-browser-compat-data
-    // todo: replace the hardcoded compat data to mdn-browser-compat-data
-    // after https://github.com/mdn/browser-compat-data/pull/6394 is published
-    newData["proposal-export-namespace-from"] = {
-      chrome: "72",
-      edge: "79",
-      opera: "60",
-      firefox: "80",
-      node: "13.2",
-      samsung: "11.0",
-    };
-  }
-  const dataPath = path.join(__dirname, `../data/${target}s.json`);
+const newData = generateData(environments, require("./data/plugin-features"));
+// add export-namespace-from from mdn-browser-compat-data
+// todo: replace the hardcoded compat data to mdn-browser-compat-data
+// after https://github.com/mdn/browser-compat-data/pull/6394 is published
+newData["proposal-export-namespace-from"] = {
+  chrome: "72",
+  edge: "79",
+  opera: "60",
+  firefox: "80",
+  node: "13.2",
+  samsung: "11.0",
+};
 
-  if (!writeFile(newData, dataPath, target)) {
-    process.exitCode = 1;
-    break;
-  }
+const dataPath = path.join(__dirname, "../data/plugins.json");
+if (!writeFile(newData, dataPath, "plugin")) {
+  process.exitCode = 1;
 }