How to format selected code using vscode and Prettier? - visual-studio-code

Question

I have add Prettier in my VScode but I want to format my code only when I highlight my code,
say
let a = [1, 2, 3, 4]; (line1)
let b = [ 1,2 ,3,4]; (line3)
how can I just format line 1 when I highlight line 1 only and the result should be
let a = [1, 2, 3, 4]; (line1)
let b = [ 1,2 ,3,4]; (line3)
thanks
UPDATE:
I know we can format the code in a code block. But what I want to do is
const test = (a, b, c) => { (line 1)
console.log("show a", a); (line 2)
console.log("show b", b); (line 3)
}
If I highlight b, c in line 1 and format it. It only formats the code in line 1 but not 2 and 3
futher update:
this is my vscode shortcut setting
when I highlight like this,
it becomes like that

Answer 1

I dont know the solution yet, but there are some info that may help.
Basically, there are something wrong with the linter. ( https://github.com/prettier/prettier-vscode/issues/137 )
And your may fix it by checking out this https://prettier.io/docs/en/integrating-with-linters.html ,
I dont know how & didnt try. cuz:: [[
looks complicated (download many things) & mess up with the project structure
may not even work
some info I have no knowledge of / incompatible with my understanding
dont know what will happen to my linters
dont know what is the next step
[]
https://github.com/prettier/prettier-vscode/issues/134
[]
No, the issue is with prettier-eslint not supporting range formatting.
...
I would suggest switching to the recommended approach of integrating ESLint and Prettier
https://github.com/prettier/prettier-vscode/issues/137
[]
let Prettier do the formatting and configure the linter to not deal with formatting rules. You can find instructions on how to configure each linter on the Prettier docs site.
...
For details refer to the Prettier documentation.
https://github.com/prettier/prettier-vscode#linter-integration
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Linters usually contain not only code quality rules, but also stylistic rules. Most stylistic rules are unnecessary when using Prettier, but worse – they might conflict with Prettier! Use Prettier for code formatting concerns, and linters for code-quality concerns, as outlined in Prettier vs. Linters.
Luckily it’s easy to turn off rules that conflict or are unnecessary with Prettier, by using these pre-made configs:
eslint-config-prettier
stylelint-config-prettier
https://prettier.io/docs/en/integrating-with-linters.html
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I would like to format my code with prettier, then apply all eslint fixes. Previously, this could be achieved by setting prettier.eslintIntegration to true. Now, the extension say that this option is [DEPRECTAED] and prettier-eslint should be used instead. However, it's not clear how to use prettier-eslint in vscode.
https://github.com/prettier/prettier-vscode/issues/999
Actually, "format only selected code" is working on my end, I didnt do any fancy extra config.
What you need to pay attention to is the "syntax tree"
-- ie: dont blindly select across the scope (the bracket {}).
#eg::
given
function test() {
let a = [1, 2, 3, 4];
let b = [ 1,2 ,3,4]; // select only this line
return false
}
if you only select::
let b = [ 1,2 ,3,4];
then press ctrl+k, ctrl+f
everything is fine
if you select across the bracket (the } for function scope)::
let b = [ 1,2 ,3,4]; // select only this line
return false
}
then press ctrl+k, ctrl+f
the whole thing in the bracket (the } for function scope) gets formatted
the "syntax tree" in a class is a bit weird.
-- ie: if you select the WHOLE function AA & format it -- codes inside another function BB will also get formatted...
you may need to apply // prettier-ignore somewhere to prevent formatting
prettier-ignore
A JavaScript comment of // prettier-ignore will exclude the next node in the abstract syntax tree from formatting.
https://prettier.io/docs/en/ignore.html
(note, it seems there is no ending tag for // prettier-ignore for Javascript (at current stage of Prettier))
for the meaning of a "syntax tree", see ex below
if you place it above the code line
seems it applies to the item (the code) (-- which is a "syntax tree node") directly below ((empty lines not counted for)) the // prettier-ignore line
-- eg-below: console.log("show a", a);, and ends there.
if you place it behind the code line (inline)
seems it applies to the inline code only
#for_your_case-do_this:
const test = (a, b, c) => {
// prettier-ignore
console.log("show a", a);
// prettier-ignore
console.log("show b", b);
}
// or
const test = (a, b, c) => {
console.log("show a", a); // prettier-ignore
console.log("show b", b); // prettier-ignore
}

Answer 2

Select the code you want to format and press CTRL + SHIFT + P to open the command pallette. Then type in "format" and select format selected code. Or you can select your code and press right click which should bring up a context menu where you can select the option

Answer 3

Select the code or leave the cursor in the row you want to format and press Ctrl + K Ctrl + F.