swc-project/swc · error · Error

Expected Declaration value

Error message

Expected Declaration value

What it means

Fired in parse_generic_value when the current token does not map to any known component value production (not a function/color/hash/delim/etc.). The parser cannot build any AST node from this token, so it emits this fallback 'expected declaration value' error at the token's span.

Source

Thrown at crates/swc_css_parser/src/parser/values_and_units/mod.rs:117

                        if *err.kind() != ErrorKind::Ignore {
                            self.errors.push(err);
                        }

                        locv.children
                    }
                };

                return Ok(ComponentValue::SimpleBlock(Box::new(block)));
            }

            tok!("#") => {
                return Ok(ComponentValue::Color(self.parse()?));
            }

            _ => {}
        }

        Err(Error::new(span, ErrorKind::Expected("Declaration value")))
    }

    /// Parse value as <any-value>.
    pub(super) fn parse_any_value(&mut self) -> PResult<Vec<TokenAndSpan>> {
        let mut tokens = Vec::new();
        let mut balance_stack: Vec<Option<char>> = Vec::new();

        // The <any-value> production matches any sequence of one or more tokens,
        // so long as the sequence ...
        loop {
            if is!(self, EOF) {
                break;
            }

            match cur!(self) {
                // ... <bad-string-token>, <bad-url-token>,
                tok!("bad-string") | tok!("bad-url") => {
                    break;

View on GitHub (pinned to 5176682b65)

Solutions

1. Replace the offending token with a valid component value (number, dimension, percentage, ident, function, etc.)
2. Check for typos or unsupported syntax at the reported position

When it happens

Trigger: Thrown at crates/swc_css_parser/src/parser/values_and_units/mod.rs:117 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/82695371d991eac4. Report an issue: GitHub.