biome_js_formatter 0.0.2

Biome's JavaScript formatter
Documentation 
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use crate::prelude::*;
use biome_formatter::write;

use crate::parentheses::NeedsParentheses;
use biome_js_syntax::{JsForOfStatement, JsIdentifierAssignmentFields};
use biome_js_syntax::{JsIdentifierAssignment, JsSyntaxNode};

#[derive(Debug, Clone, Default)]
pub(crate) struct FormatJsIdentifierAssignment;

impl FormatNodeRule<JsIdentifierAssignment> for FormatJsIdentifierAssignment {
    fn fmt_fields(&self, node: &JsIdentifierAssignment, f: &mut JsFormatter) -> FormatResult<()> {
        let JsIdentifierAssignmentFields { name_token } = node.as_fields();

        write![f, [name_token.format()]]
    }

    fn needs_parentheses(&self, item: &JsIdentifierAssignment) -> bool {
        item.needs_parentheses()
    }
}

impl NeedsParentheses for JsIdentifierAssignment {
    #[inline]
    fn needs_parentheses_with_parent(&self, parent: &JsSyntaxNode) -> bool {
        let is_async = self
            .name_token()
            .map_or(false, |name| name.text_trimmed() == "async");

        if is_async && JsForOfStatement::can_cast(parent.kind()) {
            let for_of = JsForOfStatement::unwrap_cast(parent.clone());

            for_of.await_token().is_none()
        } else {
            false
        }
    }
}

#[cfg(test)]
mod tests {

    use crate::{assert_needs_parentheses, assert_not_needs_parentheses};
    use biome_js_syntax::JsIdentifierAssignment;

    #[test]
    fn needs_parentheses() {
        assert_needs_parentheses!("for ((async) of []) {}", JsIdentifierAssignment);

        assert_not_needs_parentheses!("for await (async of []) {}", JsIdentifierAssignment);
        assert_not_needs_parentheses!("for (test of []) {}", JsIdentifierAssignment);
    }
}