Minor changes

chapter03/package.json

@@ -5,7 +5,8 @@
     "main": "index.js",
     "scripts": {
         "build": "flow-remove-types src/ -d out/",
-        "buildWithMaps": "flow-remove-types src/ -d out/ --pretty --sourcemaps",
+        "buildWithMaps":
+            "flow-remove-types src/ -d out/ --pretty --sourcemaps",
         "start": "npm run build && node out/doroundmath.js",
         "start-db": "npm run build && node out/dbaccess.js",
         "nodemon": "nodemon --watch src --delay 1 --exec npm start",
@@ -19,10 +20,7 @@
     "author": "Federico Kereki",
     "license": "ISC",
     "babel": {
-        "presets": [
-            "env",
-            "flow"
-        ]
+        "presets": ["env", "flow"]
     },
     "eslintConfig": {
         "parserOptions": {
@@ -31,41 +29,24 @@
         },
         "parser": "babel-eslint",
         "env": {
-            "browser": true,
             "node": true,
             "es6": true
         },
-        "extends": [
-            "eslint:recommended",
-            "plugin:flowtype/recommended"
-        ],
-        "plugins": [
-            "babel",
-            "flowtype"
-        ],
+        "extends": ["eslint:recommended", "plugin:flowtype/recommended"],
+        "plugins": ["babel", "flowtype"],
         "rules": {
             "no-console": "off",
             "no-var": "error",
             "prefer-const": "error"
         }
     },
-    "eslintIgnore": [
-        "**/out/*.js"
-    ],
+    "eslintIgnore": ["**/out/*.js"],
     "flow-coverage-report": {
         "concurrentFiles": 1,
-        "excludeGlob": [
-            "node_modules/**"
-        ],
-        "includeGlob": [
-            "src/**/*.js"
-        ],
+        "excludeGlob": ["node_modules/**"],
+        "includeGlob": ["src/**/*.js"],
         "threshold": 90,
-        "type": [
-            "text",
-            "html",
-            "json"
-        ]
+        "type": ["text", "html", "json"]
     },
     "prettier": {
         "tabWidth": 4,

chapter03/src/process_exec.js

@@ -1,22 +1,15 @@
 /* @flow */
+"use strict";
 
 const child_process = require("child_process");
 const { promisify } = require("util");
 
 child_process.exec = promisify(child_process.exec);
 
-async function getDirectory(path: ?string) {
+async function getDirectoryJs(path: string) {
     try {
         const cmd = "ls -ld -1 *.js";
-
-        let stdout;
-        if (typeof path === "undefined") {
-            ({ stdout } = await child_process.exec(cmd));
-        } else {
-            // $FlowFixMe: Flow doesn't understand "promisify()"
-            ({ stdout } = await child_process.exec(cmd, { cwd: path }));
-        }
-
+        const stdout = await child_process.exec(cmd, { cwd: path });
         console.log("OUT", path || "");
         console.log(stdout);
     } catch (e) {
@@ -24,19 +17,12 @@ async function getDirectory(path: ?string) {
     }
 }
 
-getDirectory();
+getDirectoryJs("/boot");
 /*
-OUT
--rw-r--r-- 1 fkereki users 3336 Apr 10 13:12 dbaccess.js
--rw-r--r-- 1 fkereki users  319 Apr 10 13:12 doroundmath.js
--rw-r--r-- 1 fkereki users  890 Apr 10 13:12 flowcomments.js
--rw-r--r-- 1 fkereki users  293 Apr 10 13:12 miniserver.js
--rw-r--r-- 1 fkereki users  751 Apr 10 13:12 process_exec.js
--rw-r--r-- 1 fkereki users 1311 Apr 10 13:12 promisify.js
--rw-r--r-- 1 fkereki users  828 Apr 10 13:12 roundmath.js
+ERR ls: cannot access '*.js': No such file or directory
 */
 
-getDirectory("/home/fkereki/MODERNJS/chapter03/flow-typed/npm");
+getDirectoryJs("/home/fkereki/MODERNJS/chapter03/flow-typed/npm");
 /*
 OUT /home/fkereki/MODERNJS/chapter03/flow-typed/npm
 -rw-r--r-- 1 fkereki users  4791 Apr  9 12:52 axios_v0.18.x.js

chapter03/src/process_fork_dir.js

@@ -1,14 +1,12 @@
+"use strict";
+
 const fs = require("fs");
 
 process.on("message", obj => {
-    console.log("GOT!", obj);
-
     // Received a path to process
     fs
         .readdirSync(obj.path)
         .sort((a, b) => a.toLowerCase().localeCompare(b.toLowerCase()))
         .filter(file => !file.startsWith("."))
-        .forEach(file => {
-            process.send(file);
-        });
+        .forEach(file => process.send(file));
 });

chapter03/src/process_spawn.js

@@ -1,12 +1,11 @@
 /* @flow */
+"use strict";
 
 const path = require("path");
 const { spawn } = require("child_process");
 const child = spawn("node", [path.resolve("out/process_spawn_dir.js")]);
 
-const filePath = "/home/fkereki";
-
-child.stdin.write(filePath);
+child.stdin.write("/home/fkereki");
 
 child.stdout.on("data", data => {
     console.log(String(data));

chapter03/src/process_spawn_dir.js

@@ -1,3 +1,6 @@
+/* @flow */
+"use strict";
+
 const fs = require("fs");
 
 process.stdin.resume();
@@ -8,9 +11,7 @@ process.stdin.on("data", path => {
         .readdirSync(path)
         .sort((a, b) => a.toLowerCase().localeCompare(b.toLowerCase()))
         .filter(file => !file.startsWith("."))
-        .forEach(file => {
-            process.stdout.write(file + "\n");
-        });
+        .forEach(file => process.stdout.write(file + "\n"));
 
     process.stdout.end();
 });