Kickoff

• https://chat.deepseek.com/a/chat/s/02a193f8-5082-4aad-a41c-4e9f5e16af4b

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1. install : globally

• npm install typescript -g

  tsc abc.ts --out ../../abc.js
  tsc abc.ts --watch
  tsc --help
  tsc --init : generate tsconfig.json file with default compiler options.
  

2. tsc compiler option

• tsc compiler option

  --strict                Enable all strict type checking options
  --noImplicitAny         Raise error on expressions with implied 'any' type
  --strictNullChecks      Enable strict null checks
  --target es5 | es6      Specify ECMAScript target version
  --module commonjs       Specify module code generation
  --outDir ./dist         Redirect output structure to directory
  

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3. Intro : typescript

• Microsoft’s extension for JavaScript which supports
• OOPS features
• strong typing system which enhances the productivity.
• Can write JS in TS
• language plus compiler to trans compile

• build tools like npm, bower, gulp, webpack etc.,

• has no runtime: TS >> JS >> JS engine

4 Advantages : typescript

• Catch lots of error at compile time, makes JS robust
• adds additional feature to evolving ES6+
• Make JS from Dynamic type to static type

1 OOPS: Class, interface, Enum, generic, Access specifies

• obj1.proNotExist = "someValue" // cannot do in TS
• no more object literal, use class template
• no more prototype
• no more constructor function
• fact : just syntactical sugar

2 String Typing

• note: 01_typing.md
• prog: data.type.ts
• es6+ 007_JS_ES6.md

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5. Create TS project (npm / node project)

• Install Node js and npm, they provide running env for TS.
• go to project folder, hit npm --init : it will create package.json
• update package.json

    "scripts": {
      "ng": "ng",
      "start": "ng serve",
      "build": "ng build",
      "watch": "ng build --watch --configuration development",
      "test": "ng test"
    },