swc-project/swc · error · Error

Unexpected end of file, but expected '{'

Error message

Unexpected end of file, but expected '{'

What it means

Fired while parsing a QualifiedRule per the CSS qualified-rule consumption algorithm: the token stream hit EOF before the rule's '{ ... }' block was found, so the rule is unterminated. Input at fault is a truncated stylesheet fragment such as `div { color: red` where the closing context never appears.

Source

Thrown at crates/swc_css_parser/src/parser/syntax/mod.rs:266

impl<I> Parse<QualifiedRule> for Parser<I>
where
    I: ParserInput,
{
    fn parse(&mut self) -> PResult<QualifiedRule> {
        // To consume a qualified rule:

        // Create a new qualified rule with its prelude initially set to an empty list,
        // and its value initially set to nothing.
        let span = self.input.cur_span();
        let mut prelude = Vec::new();

        // Repeatedly consume the next input token:
        loop {
            // <EOF-token>
            // This is a parse error. Return nothing.
            if is!(self, EOF) {
                return Err(Error::new(
                    span!(self, span.lo),
                    ErrorKind::EofButExpected("'{'"),
                ));
            }

            match cur!(self) {
                // <semicolon-token>
                // If mixed with declarations is true, this is a parse error; return nothing.
                // Otherwise, append a <semicolon-token> to the qualified rule’s prelude.
                tok!(";") => {
                    if self.ctx.mixed_with_declarations {
                        let span = self.input.cur_span();

                        return Err(Error::new(span, ErrorKind::Expected("'{'")));
                    } else {
                        let component_value = self.parse_as::<ComponentValue>()?;

                        prelude.push(component_value);

View on GitHub (pinned to 5176682b65)

Solutions

1. Close the qualified rule with a { ... } block
2. Surface the error from the parse result
3. Fix the truncated CSS

When it happens

Trigger: Thrown at crates/swc_css_parser/src/parser/syntax/mod.rs:266 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of swc-project/swc@5176682b65 (2026-08-17). Data as JSON: /api/errors/75fd4ebeeee1c6f7. Report an issue: GitHub.