How to use the parse function from babel-eslint

Find comprehensive JavaScript babel-eslint.parse code examples handpicked from public code repositorys.

babel-eslint.parse is a function that parses JavaScript code using Babel and returns an abstract syntax tree (AST) that can be analyzed or modified programmatically.

require_license_header.js

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const licenses = options.licenses;

assert(!!licenses, '"licenses" option is required');

return licenses.map((license, i) => {
  const parsed = babelEslint.parse(license);
  assert(
    !parsed.body.length,
    `"licenses[${i}]" option must only include a single comment`
  );

+ 7 other calls in file

locales.js

GitHub: CoorpAcademy/components

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const traverseFile = (t, locales, dirname) => {
  const localesData = mapValues(pipe(interpolate, uniq), locales);
  return file => {
    const fileContent = fs.readFileSync(file, 'utf8');
    const relativePath = path.relative(dirname, file);
    const ast = babelESLint.parse(fileContent);
    const usedKeys = [];


    const visitor = {
      enter: node => {

+ 6 other calls in file

How does babel-eslint.parse work?

babel-eslint.parse is a function that parses JavaScript code using Babel and returns an abstract syntax tree (AST) that can be analyzed or modified programmatically.

When babel-eslint.parse is called with a string of JavaScript code, it performs the following steps:

It creates a new instance of the BabelParser class from the @babel/parser package.
It uses the BabelParser instance to parse the JavaScript code and generate an AST.
It returns the generated AST.

Here's an example of how you could use babel-eslint.parse to parse a string of JavaScript code:

javascript
const babelEslintParser = require('babel-eslint').parse;

const code = 'const x = 42;';

const ast = babelEslintParser(code);

console.log(ast);

In this example, we're first requiring the babel-eslint package and importing the parse function from it.

We're then defining a string called code with the value "const x = 42;". This is the JavaScript code that we want to parse.

We're then calling the babelEslintParser function with the code string as an argument. This will generate an AST for the code.

Finally, we're logging the AST to the console.

When we run this code, we'll get output that looks like this:

yaml
{
  type: 'Program',
  start: 0,
  end: 13,
  loc: { start: [Position], end: [Position], lines: [Lines] },
  sourceType: 'script',
  body: [ { type: 'VariableDeclaration', start: 0, end: 13, declarations: [Array], kind: 'const' } ],
  comments: []
}

As you can see, the babel-eslint.parse function has generated an AST that represents the code we passed to it. The AST contains information about the structure of the code, such as the type of each node, its start and end positions, and any child nodes that it has.

onyx-props-must-have-default.js

GitHub: Expensify/eslint-config-expensify

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// Need to append .js since file extension is not used in imports
const importedFile = `${path.resolve(path.dirname(context.getFilename()), importedVariableValue)}.js`;
let importedValue;
try {
    const raw = fs.readFileSync(importedFile);
    const ast = parse(raw.toString(), {sourceType: 'module'});
    if (type === 'ImportSpecifier') {
        // If the import is of type - import {prop} from "./props"
        const variableName = variableNode.defs[0].node.imported.name;
        importedValue = _.find(

+ 7 other calls in file

index.js

GitHub: kdavidfong/ST3-packages

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const utils = require('../../../lib/utils/index')
const assert = require('assert')


describe('getComputedProperties', () => {
  const parse = function (code) {
    return babelEslint.parse(code).body[0].declarations[0].init
  }


  it('should return empty array when there is no computed property', () => {
    const node = parse(`const test = {

+ 9 other calls in file

Ai Example

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const babelEslintParser = require("babel-eslint").parse;

const code = "const x = 42;";

const ast = babelEslintParser(code);

console.log(ast);

In this example, we're using babel-eslint.parse to generate an abstract syntax tree (AST) for the string of JavaScript code const x = 42;. When we run this code, we'll get output that looks like this: yaml Copy code

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