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Migrating from ES5 to TS gradually

I am running on a huge project with thousands of .js files that are written in es5, and for many reasons and benefits of TS, we've decided to start migrating to TS, after a couple of days and many pieces of research, I am going to elaborate a couple of points:

To start migrating from es5 to ts we can start either by two ways:

First way:

1- Installing ts, creating tsconfig with allowJS set to true then start changing the extension of files to .ts and everything will work by default

2- As we want to migrate gradually we don't want at once to replace the global scripts to native modules, in other words, we don't want immediately to type import and export, but instead we want to keep the old way global scripts and use /// <reference path=""> to load dependencies

3- after previous step we can gradually start turning the files into native modules esm

Second way:

1- As I've read about UMD it will work on both borwser(client) and server, which means support all type of modules AMD, CommonJS, SystemJS and Native ES modules

2- after re-writing the scripts in UMD fashion, we can gradually start moving our scripts to ESM

last but not least, and regarding the intelligence we'll start writing .d.ts files accordingly or we can rely on ts-loader to generate the files

lastly, we either go with ts-loader or babel but we are not sure if there are couple of limitations for each of which

Any idea is really appreciated on what is the best way to start migrating

Via Active questions tagged javascript - Stack Overflow https://ift.tt/xie2KyR
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