Typescript from getting started to mastering (XVI) configuration file - first knowledge of compileroptions configuration item

Know and learn tsconfig.json in compilerOptions Configuration item

removeComments attribute ：

removeComments yes complerOptions A sub attribute in , Its purpose is to tell TypeScript Yes, compiled js Whether the file displays comments （ annotation ）. For example, we now put removeComments Is set to true, Is in the js Do not show comments in .

// I'm xiaoha 
let perosn:string =" Ha "

After writing the notes , Directly in the terminal , Input tsc, When you're done typing , A will be generated soon Demo.js file , After opening, you will see the following code .

"use strict";
var perosn = " Ha ";

The comments written in this way are not compiled to Demo.js in

strict attribute ：

strict Property if set to true, It represents our compilation and writing specifications , According to TypeScript The strictest standard to write , If we set this to false Or comment out , It means that we can set some loose writing methods for .

noImplicitAny attribute :

noImplicitAny The function of attributes is , Allow your annotation type any Don't make it clear
For better explanation , Let's take an example , stay Demo.ts in , Write a method , We set the parameters of the method to any type (any)

function xiaoha(name){
    
    return name
}

At this time, our TypeScript It is for error reporting , We use it tsc Compilation is also an error . That's because we opened strict:true, Let's comment out , And then put noImplicitAny Is set to false, No more misstatements .

• If set to noImplicitAny:true, It means value, even if it is any（ Any value ）, You also have to type comment .

Simply understood as ,noImplicitAny Set to true, Namely The top must be clearly set any Type value .

strictNullChecks attribute ：

strictNullChecks Set to false, It means , No mandatory inspection NULL type .
Here's the picture :

If instead true when , Mandatory inspection NULL type , If there is, report an error
Here's the picture :