init npm project notes

Author: gambitier

session 6/BooksLibrary/package-lock.json

@@ -8,5 +8,8 @@
 		"start": "tsc && ts-node --files ./src/index.ts"
 	},
 	"author": "akash jadhav",
-	"license": "ISC"
+	"license": "ISC",
+	"devDependencies": {
+		"typescript": "^4.6.2"
+	}
 }

session 6/BooksLibrary/package.json

@@ -0,0 +1,81 @@
+# setup nodejs with typescript
+
+Initialize a Project
+
+```
+npm init
+```
+
+First, you need TypeScript installed absolutely.You can decide to have it installed globally on your machine, or locally to your project.
+
+tsc is the TypeScript compiler and has a command line interface with plenty of available options.
+
+To install TypeScript globally, run:
+
+```
+npm i typescript -g
+tsc --init
+```
+
+And to install locally, run:
+
+If you’re using a version of TypeScript installed locally, you’ll instead want to ensure that you’re running the local version by simply using npx.
+
+```
+npm install typescript --save-dev
+npx tsc --init
+```
+
+After running tsc with the ‘--init’ flag, a ‘tsconfig.json’ file will be added to your project folder with a few sensible defaults and an extensive list of commented-out possible configurations.
+
+For our project the file ‘tsconfig.json’ are as follows
+
+```
+{
+	"compilerOptions": {
+		"declaration": true,
+		"experimentalDecorators": true,
+		"emitDecoratorMetadata": true,
+		"module": "commonjs",
+		"esModuleInterop": true,
+		"target": "es6",
+		"listFiles": true,
+		"noImplicitAny": false,
+		"moduleResolution": "node",
+		"sourceMap": true,
+		"noEmitHelpers": false,
+		"alwaysStrict": true,
+		"suppressImplicitAnyIndexErrors": false,
+		"forceConsistentCasingInFileNames": true,
+		"resolveJsonModule": true,
+		"outDir": "dist/",
+		"diagnostics": true,
+		"baseUrl": ".",
+		"paths": {
+			"*": ["node_modules/*"]
+		},
+		"typeRoots": ["@types", "node_modules/@types"]
+	},
+	"include": ["src/**/*"],
+	"exclude": ["node_modules"]
+}
+```
+
+With the tsconfig.json in place, we can start coding our app in TypeScript.
+
+we will add following scripts in `package.json`
+
+```
+"build": "tsc",
+"start": "tsc && ts-node --files ./src/index.ts"
+```
+
+and then we can use `npm run build` to transpile typescript files. With this, the JavaScript files that the TypeScript compiler outputs will be in a dist folder and sourceMaps will be generated.
+
+similarly we can use `npm run start` to run the `src/index.ts` file, where we will put our server initialization code soon.
+
+# Configuring ESLint
+
+[docs](https://eslint.org/docs/user-guide/getting-starteds)
+
+ESLint is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code, with the goal of making code more consistent and avoiding bugs.