Update to NPM version

ProjectSourceCode/node_modules/mocha/lib/cli/watch-run.js

@@ -0,0 +1,106 @@
+'use strict';
+
+const utils = require('../utils');
+const Context = require('../context');
+const Mocha = require('../mocha');
+const collectFiles = require('./collect-files');
+
+/**
+ * Exports the `watchRun` function that runs mocha in "watch" mode.
+ * @see module:lib/cli/run-helpers
+ * @module
+ * @private
+ */
+
+/**
+ * Run Mocha in "watch" mode
+ * @param {Mocha} mocha - Mocha instance
+ * @param {Object} opts - Options
+ * @param {string} opts.ui - User interface
+ * @param {Object} fileCollectParams - Parameters that control test
+ *   file collection. See `lib/cli/collect-files.js`.
+ * @param {string[]} fileCollectParams.extension - List of extensions to watch
+ * @private
+ */
+module.exports = (mocha, {ui}, fileCollectParams) => {
+  let runner;
+  const files = collectFiles(fileCollectParams);
+
+  console.log();
+  hideCursor();
+  process.on('SIGINT', () => {
+    showCursor();
+    console.log('\n');
+    // By UNIX/Posix convention this indicates that the process was
+    // killed by SIGINT which has portable number 2.
+    process.exit(128 + 2);
+  });
+
+  const watchFiles = utils.files(process.cwd(), fileCollectParams.extension);
+  let runAgain = false;
+
+  const loadAndRun = () => {
+    try {
+      mocha.files = files;
+      runAgain = false;
+      runner = mocha.run(() => {
+        runner = null;
+        if (runAgain) {
+          rerun();
+        }
+      });
+    } catch (e) {
+      console.log(e.stack);
+    }
+  };
+
+  const purge = () => {
+    watchFiles.forEach(Mocha.unloadFile);
+  };
+
+  loadAndRun();
+
+  const rerun = () => {
+    purge();
+    eraseLine();
+    mocha.suite = mocha.suite.clone();
+    mocha.suite.ctx = new Context();
+    mocha.ui(ui);
+    loadAndRun();
+  };
+
+  utils.watch(watchFiles, () => {
+    runAgain = true;
+    if (runner) {
+      runner.abort();
+    } else {
+      rerun();
+    }
+  });
+};
+
+/**
+ * Hide the cursor.
+ * @ignore
+ * @private
+ */
+const hideCursor = () => {
+  process.stdout.write('\u001b[?25l');
+};
+
+/**
+ * Show the cursor.
+ * @ignore
+ * @private
+ */
+const showCursor = () => {
+  process.stdout.write('\u001b[?25h');
+};
+
+/**
+ * Erases the line on stdout
+ * @private
+ */
+const eraseLine = () => {
+  process.stdout.write('\u001b[2K');
+};