Update core 8.3.0

web/core/scripts/js/.eslintrc.json

@@ -0,0 +1,5 @@
+{
+  "rules": {
+    "strict": [2, "global"]
+  }
+}

web/core/scripts/js/babel-es6-build.js

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+/**
+ * @file
+ *
+ * Compile *.es6.js files to ES5.
+ *
+ * @internal This file is part of the core javascript build process and is only
+ * meant to be used in that context.
+ */
+
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const babel = require('babel-core');
+const glob = require('glob');
+
+// Logging human-readable timestamp.
+const log = function (message) {
+  // eslint-disable-next-line no-console
+  console.log(`[${new Date().toTimeString().slice(0, 8)}] ${message}`);
+};
+
+function addSourceMappingUrl(code, loc) {
+  return code + '\n\n//# sourceMappingURL=' + path.basename(loc);
+}
+
+const changedOrAdded = (filePath) => {
+  babel.transformFile(filePath, {
+    sourceMaps: true,
+    comments: false
+  }, function (err, result) {
+    const fileName = filePath.slice(0, -7);
+    // we've requested for a sourcemap to be written to disk
+    let mapLoc = `${fileName}.js.map`;
+
+    fs.writeFile(mapLoc, JSON.stringify(result.map));
+    fs.writeFile(`${fileName}.js`, addSourceMappingUrl(result.code, mapLoc));
+
+    log(`'${filePath}' is being processed.`);
+  });
+};
+
+const fileMatch = './**/*.es6.js';
+const globOptions = {
+  ignore: 'node_modules/**'
+};
+const processFiles = (error, filePaths) => {
+  if (error) {
+    process.exitCode = 1;
+  }
+  filePaths.forEach(changedOrAdded);
+};
+glob(fileMatch, globOptions, processFiles);
+process.exitCode = 0;

web/core/scripts/js/babel-es6-watch.js

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+/**
+ * @file
+ *
+ * Watch changes to *.es6.js files and compile them to ES5 during development.
+ *
+ * @internal This file is part of the core javascript build process and is only
+ * meant to be used in that context.
+ */
+
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const babel = require('babel-core');
+const chokidar = require('chokidar');
+
+// Logging human-readable timestamp.
+const log = function log(message) {
+  // eslint-disable-next-line no-console
+  console.log(`[${new Date().toTimeString().slice(0, 8)}] ${message}`);
+};
+
+function addSourceMappingUrl(code, loc) {
+  return `${code}\n\n//# sourceMappingURL=${path.basename(loc)}`;
+}
+
+const fileMatch = './**/*.es6.js';
+const watcher = chokidar.watch(fileMatch, {
+  ignoreInitial: true,
+  ignored: 'node_modules/**'
+});
+
+const changedOrAdded = (filePath) => {
+  babel.transformFile(filePath, {
+    sourceMaps: true,
+    comments: false
+  }, (err, result) => {
+    const fileName = filePath.slice(0, -7);
+    // we've requested for a sourcemap to be written to disk
+    const mapLoc = `${fileName}.js.map`;
+
+    fs.writeFileSync(mapLoc, JSON.stringify(result.map));
+    fs.writeFileSync(`${fileName}.js`, addSourceMappingUrl(result.code, mapLoc));
+
+    log(`'${filePath}' has been changed.`);
+  });
+};
+
+const unlinkHandler = (err) => {
+  if (err) {
+    log(err);
+  }
+};
+
+watcher
+  .on('add', filePath => changedOrAdded(filePath))
+  .on('change', filePath => changedOrAdded(filePath))
+  .on('unlink', (filePath) => {
+    const fileName = filePath.slice(0, -7);
+    fs.stat(`${fileName}.js`, () => {
+      fs.unlink(`${fileName}.js`, unlinkHandler);
+    });
+    fs.stat(`${fileName}.js.map`, () => {
+      fs.unlink(`${fileName}.js.map`, unlinkHandler);
+    });
+  })
+  .on('ready', () => log(`Watching '${fileMatch}' for changes.`));

web/core/scripts/js/rename-js-files-to-es6.sh

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+#!/bin/bash
+
+# Rename *.js files in *.es6.js. Only need to be run once.
+# Should be removed after *.es6.js files are committed to core.
+#
+# @internal This file is part of the core javascript build process and is only
+# meant to be used in that context.
+
+for js in `find ./{misc,modules,themes} -name '*.js'`;
+do
+   mv ${js} ${js%???}.es6.js;
+done