JS beautify break the angular compile

[1011178l]

Description

I use the js-beautify to beauty my angular 6 code generated by angular-cli. However, for a file called 'test.ts', js-beautify will break a statement:

declare const require: any;

into two lines:

declare
const require: any;

which will break the angular compile:

ERROR in src/test.ts(12,1): error TS2304: Cannot find name 'declare'.
src/test.ts(13,7): error TS1155: 'const' declarations must be initialized.

Steps to Reproduce

1. use angular-cli to create a new project

npm install angular-cli
ng new demo-project

2. then use the js-beautify to beauty the file demo-project/src/test.ts
   compile the project

npm install
npm start

Then we will get the error message.

Environment

OS: Debian 9, Node 8.11.3 npm 6.3.0, angular 6.1.3

Settings

no settings, all default
run like

js-beautify -r [outputfile]

[bitwiseman]

Yes, the problem is the TypeScript is not JavaScript. In JavaScript const starts on a new line. In this case, in TypeScript, it should not. It would be possible to add a special case for this, but this it has certainly reached a point where we should split out TypeScript into a separate language interpreter.

[bitwiseman]

In the short term, we can add a special case for declare const, but these kinds of issue will continue to crop up. #1147