How to use the parseSync function from @babel/core

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

@babel/core.parseSync is a function that takes a string of code as input and returns the corresponding AST (Abstract Syntax Tree) representation of the code.

transform.js

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const transformImportProComponents = (sourceCode, options = {}) => {
  // 通过 recast 处理 ast，保证输出文件的代码风格和输入前保持一致
  const ast = parse(sourceCode, {
    parser: {
      parse: (source) => {
        const ast = parseSync(source, {
          parserOpts: {
            sourceType: 'module',
            plugins: ['jsx', 'typescript'],
            // recast uses this

253

+ 11 other calls in file

babel.md?plain=1

GitHub: ivan-94/bobi.ink

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```js
const babel = require('@babel/core')
const traverse = require('@babel/traverse').default

const ast = babel.parseSync(code)

let depth = 0
traverse(ast, {
  enter(path) {

+ 5 other calls in file

How does @babel/core.parseSync work?

@babel/core.parseSync is a method in the Babel core package that synchronously parses a given code string into an abstract syntax tree (AST), which represents the structure of the code in a hierarchical form. The method accepts options that can customize the parser behavior, such as the ECMAScript version to parse or the source type (e.g., script or module).

index.md?plain=1

GitHub: towavephone/GatsbyBlog

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```js
const babel = require('@babel/core');
const traverse = require('@babel/traverse').default;

const ast = babel.parseSync(code);

let depth = 0;
traverse(ast, {
  enter(path) {

+ 4 other calls in file

tool.js

GitHub: xiaohuoni/spack-new

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// if (isRoot && importDepend) {
//   return importDepend
// }
const context = fs.readFileSync(dirPath,'utf-8')
const tranform = babel.transform(context)
const ast = babel.parseSync(tranform.code)
const nameTemplate = babel.template(`window.%%name%% = %%name%%`)
const reactDOM = babel.template(`ReactDOM.render(React.createElement(%%name%%,{},{}),document.getElementById('root'))`)
traverse(ast,{
  ImportDeclaration(path) {

+ 5 other calls in file

Ai Example

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

const code = "const answer = 42;";
const options = { ast: true };

const ast = babel.parseSync(code, options);

console.log(ast);

In this example, we first import the @babel/core module. Then we define a string code containing some JavaScript code. We also define an options object with the ast property set to true to request the resulting AST to be returned. Finally, we call babel.parseSync with the code and options, which returns the AST object that we log to the console.

babel.config.js

GitHub: powerjett/babel-learn

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const tokenTypesMapping = new Map();
const tokenTypeSourcePath = "./packages/babel-parser/src/tokenizer/types.ts";


function getTokenTypesMapping() {
  if (tokenTypesMapping.size === 0) {
    const tokenTypesAst = parseSync(
      fs.readFileSync(tokenTypeSourcePath, {
        encoding: "utf-8",
      }),
      {

index.js

GitHub: facebook/metro

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};
const sourceAst =
  isTypeScriptSource(filename) ||
  isTSXSource(filename) ||
  !options.hermesParser
    ? parseSync(src, babelConfig)
    : require('hermes-parser').parse(src, {
        babel: true,
        sourceType: babelConfig.sourceType,
      });

613

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