createPrinter.printFile() should not remove empty lines

[Maximaximum]

I'd expect createPrinter.printFile() to format the file, but not remove the empty lines inside the file. Empty lines are meaningful, because the developers often use an empty line to structure the code into identifiable blocks. For example, to separate the import declarations from the rest of the file.

TypeScript Version: 2.7.0-dev.20171206

Code

import { createPrinter, createSourceFile, ScriptTarget, NewLineKind } from 'typescript';
import * as fs from 'fs';

const file = createSourceFile('./output.ts', `
import    {smth} from 'dfsdf';
import {smth2} from 'dfsdf2';

foo();

`, ScriptTarget.Latest);

fs.writeFileSync(file.fileName, createPrinter().printFile(file));

Expected behavior:
output.ts should contain given text:

import { smth } from "dfsdf";
import { smth2 } from "dfsdf2";

foo();

Actual behavior:
output.ts contains given text:

import { smth } from "dfsdf";
import { smth2 } from "dfsdf2";
foo();

[RyanCavanaugh]

The operations from the printer are designed around emitting the .js file, where newlines shouldn't be significant. If you're wanting to format the file, use the formatting API. See https://github.com/vvakame/typescript-formatter/blob/master/lib/formatter.ts for an example

[Maximaximum]

Thanks, that seems to be exactly what we need! But it isn't an official Typescript team project? I thought that such functionality should be a part of Typescript itself

[RyanCavanaugh]

The thing I linked to is an example of how to use the TypeScript formatter API to accomplish the task of formatting a .ts file

[Maximaximum]

Yeah, now I see it. Thanks! I think we can close this question now.