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Retsam19

•Created by Retsam19 on 11/18/2024 in #questions

Plugin panics when trying to read line number from SourceMapper

I've got a plugin where part of the logic involves reading the current line number:

pub struct MyVisitor {
    // Provided by in from TransformPluginProgramMetadata
    source_map: Arc<dyn SourceMapper>,
}

impl MyVisitor {
    fn my_fn(&mut self, node: &mut Expr) -> Result<(), Box<SpanLinesError>> {
        let line_num = self
            .source_map
            .span_to_lines(node.span())
            .map(|lines| lines.lines[0])?; 

        // also using `self.source_map.span_to_snippet` and that part works okay
    }
}

pub struct MyVisitor {
    // Provided by in from TransformPluginProgramMetadata
    source_map: Arc<dyn SourceMapper>,
}

impl MyVisitor {
    fn my_fn(&mut self, node: &mut Expr) -> Result<(), Box<SpanLinesError>> {
        let line_num = self
            .source_map
            .span_to_lines(node.span())
            .map(|lines| lines.lines[0])?; 

        // also using `self.source_map.span_to_snippet` and that part works okay
    }
}

This is working okay for tests, but I'm trying to run the plugin via the @swc/cli - npx swc /* input file */ and it's panicking:

Returned value should be serializable: wasm plugin bytecheck failed "check bytes error: check failed for tuple struct member 0: check failed for enum tuple variant Ok: check failed for tuple struct member 0: check failed for struct member file: check failed for enum tuple variant Some: check failed for tuple struct member 0: check failed for struct member lazy: invalid tag for enum: 180"
Returned value should be serializable: wasm plugin bytecheck failed "check bytes error: check failed for tuple struct member 0: check failed for enum tuple variant Ok: check failed for tuple struct member 0: check failed for struct member file: check failed for enum tuple variant Some: check failed for tuple struct member 0: check failed for struct member lazy: invalid tag for enum: 180"

I know it's the line_number lookup that's breaking it because I replace that with let line_num = 0; and it works. The two things I'm seeing from the error are 1. swc_core version issue or 2. wasi vs wasm issue But for #1, I believe the versions I'm using are compatible: * @swc/cli - 0.5.0 * @swc/core - 1.9.1 * swc_core - 4.0.3 * swc_plugin_runner - 4.0.0 And looking at the compat table, if I'm reading this right, the @swc/core version is in range https://plugins.swc.rs/versions/range/19.
(The error message points me at https://plugins.swc.rs/versions/from-plugin-runner/4.0.0 but it's a dead link) And #2, I'm doing cargo build --target wasm32-wasip1 and pointing at target/wasm32-wasip1/debug/my_plugin.wasm which seems like it should be the wasi version.

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