How do I pass parameters to the swc-plugin?

[chenwll]

I want to pass parameters to a custom swc-plugin to dynamically replace the value of a variable. How do I do this?

const swc = require("@swc/core");
const fs = require("fs");

const srcCode = `const a = 1;`;

swc.transform(srcCode, {
    "jsc": {
      "parser": {
        "syntax": "ecmascript"
      },
      "target": "es2015",
      "experimental": {
        "plugins": [
            ["/Users/chenwenliang/formal_project/baidu/personal-code/swc-plugin/target/wasm32-wasi/release/const_replace.wasm",{}],
        ]
      }
    },
    "minify": false
  }
  )
  .then((result) => {
    console.log(result.code);
  })
  .catch((err) => {
    console.error(err);
  });

[kdy1]

{} after the path to Wasm file is the config object passed to the plugin.

See https://github.com/swc-project/plugins/blob/main/packages/styled-jsx/src/lib.rs#L13 for example of getting the config from Wasm plugin

[chenwll]

thanks！If I want to simulate passing arguments to a Plugin within my test cases, how should I write that?

test_inline!(
    Default::default(),
    |_| as_folder(TransformVisitor),
    boo,
    // Input codes
    r#"console.log("transform");"#,
    // Output codes after transformed with plugin
    r#"console.log("transform");"#
);

[kdy1]

TransformVisitor can be modified to have some fields