Typescript (TS loader, tsconfig.json and lodash)

ts-loader

You can put ts and webpack Put it all together

install
npm typescript ts-loader -D

Parameters
exclude Yes, configure exclusion , Don't use
use：ts Configured ts Go check
resolve Configure files with resolvable suffixes

tsconfig.json

install tsconfig.json
npx tsc - - init

Open several important configurations
rootDir And change the value to src

outDir And change the value to dist

Set up app.js Value

npx webpack After success
bundle.js There will be parsed code in （var age = 18;）

lodash

You can visit typescriptlang.org
https://blog.csdn.net/Mingyueyixi/article/details/72782026

Then you can search

For example, search lodash, After finding , Copy top right corner @types/lodash

install lodash：
npm i @types/lodash -D

Before installation lodash Bottom red underline Report errors

installed npm i @types/lodash -D

close app.js Open it again or wait a moment , introduce lodash I won't make a mistake

So you can use it lodash The method of the
such as _join（[]) Parameters are arrays , If you do not write parameters, an error will be reported