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How to use the transformFromAstSync function from @babel/core

Find comprehensive JavaScript @babel/core.transformFromAstSync code examples handpicked from public code repositorys.

In Babel, the @babel/core.transformFromAstSync function is used to synchronously transform an AST (abstract syntax tree) using a specified set of Babel plugins and options.

transform.js

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      return ast;
    },
  },
});

const { ast: transformedAST } = transformFromAstSync(ast, sourceCode, {
  plugins: [[UpdateImportPlugin, options]],
  // allowing it to preserve formatting
  cloneInputAst: false,
  code: false,

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+ 11 other calls in file

%E5%AE%9E%E6%88%98%E6%A1%88%E4%BE%8B-%E8%87%AA%E5%8A%A8%E5%9F%8B%E7%82%B9.md?plain=1

GitHub: CavinHuang/books

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const ast = parser.parse(sourceCode, {
    sourceType: 'unambiguous'
});

const { code } = transformFromAstSync(ast, sourceCode, {
    plugins: [[autoTrackPlugin, {
        trackerPath: 'tracker'
    }]]
});

+ 5 other calls in file

How does @babel/core.transformFromAstSync work?

@babel/core.transformFromAstSync is a synchronous function in the Babel library that is used to transform an AST (abstract syntax tree) using a specified set of Babel plugins and options.

When @babel/core.transformFromAstSync is called with an AST and a set of options as input, it performs the following operations:

It applies a set of Babel plugins and options to the AST, transforming the code as specified by the plugins and options.
It returns the transformed code as a string.

By using @babel/core.transformFromAstSync, developers can transform an AST using Babel without having to first generate JavaScript code from the AST. This can be useful for advanced use cases where the AST is already available, such as when implementing custom Babel plugins or using Babel programmatically. Note that @babel/core.transformFromAstSync may not work as expected with certain types of ASTs or plugins, so it is important to test thoroughly before using it in production code.

index.js

GitHub: facebook/metro

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}

plugins.push([metroTransformPlugins.inlinePlugin, babelPluginOpts]);

ast = nullthrows(
  transformFromAstSync(ast, '', {
    ast: true,
    babelrc: false,
    code: false,
    configFile: false,

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+ 3 other calls in file

index.js

GitHub: facebook/metro

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        babel: true,
        sourceType: babelConfig.sourceType,
      });

const functionMap = generateFunctionMap(sourceAst, {filename});
const result = transformFromAstSync(sourceAst, src, babelConfig);

// The result from `transformFromAstSync` can be null (if the file is ignored)
if (!result) {
  /* $FlowFixMe BabelTransformer specifies that the `ast` can never be null but

613

Ai Example

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const babel = require("@babel/core");
const parser = require("@babel/parser");

// Parsing some code to an AST
const ast = parser.parse("const foo = () => {};");

// Applying Babel transformations to the AST
const outputCode = babel.transformFromAstSync(ast, null, {
  presets: ["@babel/preset-env"],
}).code;

console.log(outputCode); // Outputs: transformed code

In this example, we're using @babel/core.transformFromAstSync to transform an AST generated from the code "const foo = () => {};" using the @babel/preset-env preset. The transformed code is then output to the console. Note that @babel/core.transformFromAstSync does not require a file path as input, as it operates directly on an AST. This can be useful in situations where code is generated programmatically or transformed using custom tools.

tool.js

GitHub: xiaohuoni/spack-new

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      }else {
        path.parent.body.push(nameTemplate({ name: types.identifier(name) }))
      }
    }
  })
  const text = babel.transformFromAstSync(ast, tranform.code)
  cache.add(dirPath,text.code)
  cache.addDepend(dirPath,imports)
  return imports
}

+ 5 other calls in file

bundle.js

GitHub: kibuniverse/web-challenge

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// 模块的ID 从 0 开始，相当于一个js文件，可以看成一个模块
const id = ID++;

// ES6 --> ES5
const { code } = babel.transformFromAstSync(ast, null, {
  presets: ["@babel/preset-env"], // 支持被认为是 latest 的Babel所有插件
});
//   console.log(id, filename, dependencies, code);
return {

fixReturn.js

GitHub: lionche/jitfunfuzz

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    }




    // console.log(babel.transformFromAstSync(ast).code);


    return babel.transformFromAstSync(ast).code
}


// readFromFile(filename, fixReturn);

+ 5 other calls in file

index.js

GitHub: ds-sampaio/ClicouChegouApp

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const path = require("path");


const _require = require("@babel/core"),
  parseSync = _require.parseSync,
  transformFromAstSync = _require.transformFromAstSync;


const _require2 = require("metro-source-map"),
  generateFunctionMap = _require2.generateFunctionMap;

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