Environments:

• Prettier Version: 1.18.2
• Running Prettier via: CLI
• Runtime: Node 10
• Operating System: MacOS

Steps to reproduce:

echo "'aaa';\n'bbb';" | prettier --range-start 0 --range-end 1 --parser babel
'aaa';
'bbb';

Expected behavior:

Following behavior is currently documented:

The range will extend:

Backwards to the start of the first line containing the selected statement.
Forwards to the end of the selected statement.

So it should format only first quotes.

In fact there is no range I can specify so only first quote is formatted.

Actual behavior:

It formats both quotes

Additional notes:

The first range that results in formatting of both quotes is following:

echo "'aaa';\n'bbb';" | prettier --range-start 0 --range-end 14 --parser babel
"aaa";
"bbb";

Strangely nothing is formatted when range-start is 1 (again, against what is documented):

echo "'aaa';\n'bbb';" | prettier --range-start 1 --range-end 14 --parser babel
'aaa';
'bbb';