How to use the parseExpression function from @babel/parser

Find comprehensive JavaScript @babel/parser.parseExpression code examples handpicked from public code repositorys.

@babel/parser.parseExpression is a function that parses a JavaScript expression and returns an abstract syntax tree (AST) representing that expression.

inject-suite-loader.js

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        }
      }, global.CASE_TEST_START)
    }`
  }


  return parser.parseExpression(fn).body
}


module.exports = function (source) {
  const query = loaderUtils.parseQuery(this.resourceQuery || '?')

compiler-core.cjs.js

GitHub: Antonio476587/portfolio

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    }
    return !currentOpenBracketCount && !currentOpenParensCount;
};
const isMemberExpressionNode = (path, context) => {
        try {
            let ret = parser.parseExpression(path, {
                plugins: context.expressionPlugins
            });
            if (ret.type === 'TSAsExpression' || ret.type === 'TSTypeAssertion') {
                ret = ret.expression;

How does @babel/parser.parseExpression work?

@babel/parser.parseExpression() is a method provided by the Babel parser that parses a given string of code as a JavaScript expression and returns an abstract syntax tree (AST) representing the expression. The AST can be used to analyze or manipulate the expression programmatically.

transform-dev.js

GitHub: furvic/gsjproject

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visitor: {
    Identifier: {
        enter(path, state) {
            if (path.isIdentifier({ name: '__DEV__' }) && path.scope.hasGlobal('__DEV__')) {
                path.replaceWith(
                    parser.parseExpression(state.opts.expr)
                );
            }
        }
    }

common.js

GitHub: vforkliu/qt6.5.0

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  }
  return _numericLiteral(value);
}


function randomInterestingNonNumber() {
  return babylon.parseExpression(random.single(INTERESTING_NON_NUMBER_VALUES));
}


function concatFlags(inputs) {
  const flags = new Set();

Ai Example

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

const code = "const x = 5;";
const ast = parser.parseExpression(code);

console.log(ast);

This will output the following AST: json Copy code

test_mutate_variable_or_object.js

GitHub: fedeguinez/nodejs_git

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  sandbox.stub(random, 'choose').callsFake(() => { return true; });
  // This stubs out the random seed.
  sandbox.stub(random, 'randInt').callsFake(() => { return 123; });
  // Random value is itself dependent on too much randomization.
  sandbox.stub(common, 'randomValue').callsFake(
      () => { return babylon.parseExpression('0'); });
});

afterEach(() => {
  sandbox.restore();

test_mutate_arrays.js

GitHub: fedeguinez/nodejs_git

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});

it('performs all mutations', () => {
  // Make random operations deterministic.
  sandbox.stub(common, 'randomValue').callsFake(
      () => babylon.parseExpression('""'));
  helpers.deterministicRandom(sandbox);

  const source = helpers.loadTestData('mutate_arrays.js');

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