TypeScript（tsconfig.json）

tsconfig.json

Use tsc To compile all files
You must first create a new tsconfig.json file
The internal default content can be deleted first
function tsc command , be-all ts All files will be compiled into js file

-w command

ts -w The command will monitor all ts file

monitor ：js The compiled files will be automatically compiled synchronously , There is no need to compile files separately

tsconfig.json Configuration in

src

./src/**/* ** It refers to any directory ,* Refers to any file

exclude

exclude There are default values , If you do not include those files in the default values , You can not configure exclude

files

files Generally used for relatively small projects , because files List all the documents

files Need to put The files that need to be compiled are listed

compilerOptions

compilerOptions Compiler options , Determines how the compiler works ts File compilation , It can be said to be the most important configuration

The main thing is to see compilerOptions Sub options in

target
target Specify which version is compiled js

target If set to ES3, that ts Medium let, After compilation js The file will become var

Set to ESNext It is the latest es edition

Set an incorrect value , There will be everything you can write in the error message es Version writing

module
module Specify the modular specification to use
All the options （ Blue ）


notes ：
Generally recommended es2015（es2015 Namely es6）

If you put es2015 Change it to commonjs Words , Will be able to import The writing of is changed to require The introduction of writing

notes ：
above introduce It should be written in ./m.js, The first picture Inside is Write the wrong

lib
lib Used to specify library
Generally not used
Usage ： The code does not run in the browser environment , Is in node Running in the environment of , There's no dom

Values can be separated by commas , Keep writing down

notes ：
In general No settings lib It has a default value , The default is the browser's running environment

outDir
outDir Used to specify the directory of the compiled file , That's what you compiled js Where to put the documents

Generally placed on dist Catalog

outFile
outFile Output file , You can merge the code into one file

You can merge the code in the global scope into a file , There is modular code in the file , We can't merge , Will report a mistake

Merge code with modularity
If you want to merge code with modularity , Just Must be modified module Configuration of

want Change to amd or system The pattern of

notes ：
outFile With a few , Generally, this function is mostly left to the packaging tool

allowJs
allowJs Whether the js File for compilation
Default false

checkJs
checkJs Error checking js Whether the code is syntactically correct , The default is false

commonly allowJs and checkJs Or use it together , Or not at all

removeComments
removeComments Remove comments

noEmit
noEmit Do not generate compiled files

noEmitError
noEmitError When there are errors, the compiled file will not be generated , The default value is false

alwaysScrict
Is to make the compilation strict
alwaysScrict Set the compiled file , Whether to use strict mode , The default value is false

noImplicitAny
noImplicitAny Implicit... Is not allowed any type

noImplicitThis
noImplicitThis It is not allowed to be of indefinite type this
The default value is false

hold noImplicitThis To change the value of true
this Report errors

resolvent ：
to this Specify any type

strictNullChecks
strictNullChecks Strictly check for null values
For example, give one dom Bind click event , But it's time to dom There may be no or no return , So this check will report an error


resolvent ：
Add a judgment

Another kind dom Back Add ?. Writing

strict
strict All strictly checked master switches
It is usually written at the top of all strict inspection options

Its value is true, The values of all strict mode options are true, And these options can be left blank

Set to false All are false

notes ：
General development suggestions are set to true, Open all strict inspections , This makes the code more rigorous , The code runs with a lower probability of error