How to use the valueToNode function from babel-types

Find comprehensive JavaScript babel-types.valueToNode code examples handpicked from public code repositorys.

babel-types.valueToNode is a function in the Babel compiler that creates an AST node from a JavaScript value.

Bundler.js

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MemberExpression(node) {
  // Inline environment variables accessed on process.env
  if (matchesPattern(node.object, 'process.env')) {
    let key = babelTypes.toComputedKey(node);
    if (babelTypes.isStringLiteral(key)) {
      let val = babelTypes.valueToNode(process.env[key.value]);
      morph(node, val);
    }
  }
}

+ 3 other calls in file

instrument-lib.ts

GitHub: amarnus/learning-code-coverage

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const onExitProgram = (path: NodePath) => {
    path.node.body.unshift(template(`
        __coverage__ = COVERAGE
    `)({
        'COVERAGE': valueToNode(coverage)
    }));
};

export default function instrument(filename) {

+ 6 other calls in file

How does babel-types.valueToNode work?

babel-types.valueToNode is a function provided by the Babel compiler that creates an Abstract Syntax Tree (AST) node from a JavaScript value. To create an AST node from a value, you can call the valueToNode function and pass in the value you want to convert. The function will then determine the type of the value and create a new AST node that represents that value. For example, if you pass in a string, the function will create a StringLiteral node. If you pass in a number, it will create a NumericLiteral node. If the value is an object or an array, the function will recursively traverse the value and create AST nodes for each property or element. The resulting AST node can be used to build up a larger AST that represents the entire program. This AST can then be passed to other Babel functions to transform the code, such as transpiling newer JavaScript syntax to older syntax that is supported in more browsers.

globals.js

GitHub: mattdesl/parcel

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MemberExpression(node, asset) {
  // Inline environment variables accessed on process.env
  if (matchesPattern(node.object, 'process.env')) {
    let key = types.toComputedKey(node);
    if (types.isStringLiteral(key)) {
      let val = types.valueToNode(process.env[key.value]);
      morph(node, val);
      asset.isAstDirty = true;
    }
  }

+ 13 other calls in file

index.js

GitHub: t-mart/gvd

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    false;
if (charCodeCallExprNode === false) return node;
var indexLiteralNode = charCodeCallExprNode.arguments[0];
if (!indexLiteralNode) return node;
if (node.operator !== '===') return node;
var asciiNode = t.valueToNode(String.fromCharCode(
  (charCodeCallExprNode === node.left ?
    node.right :
    node.left).value));
var identifierIndexMemberNode = t.memberExpression(

+ 17 other calls in file

Ai Example

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const { types: t } = require("@babel/core");

const myString = "Hello, world!";
const myNumber = 42;
const myObject = { foo: "bar" };
const myArray = [1, 2, 3];

const stringLiteralNode = t.valueToNode(myString);
const numericLiteralNode = t.valueToNode(myNumber);
const objectLiteralNode = t.valueToNode(myObject);
const arrayExpressionNode = t.valueToNode(myArray);

console.log(stringLiteralNode); // StringLiteral { value: 'Hello, world!' }
console.log(numericLiteralNode); // NumericLiteral { value: 42 }
console.log(objectLiteralNode); // ObjectExpression { properties: [ ObjectProperty { key: Identifier { name: 'foo' }, value: StringLiteral { value: 'bar' } } ] }
console.log(arrayExpressionNode); // ArrayExpression { elements: [ NumericLiteral { value: 1 }, NumericLiteral { value: 2 }, NumericLiteral { value: 3 } ] }

In this example, we use the t.valueToNode function provided by @babel/types to convert various JavaScript values into AST nodes. We pass in a string, number, object, and array, and the function creates the appropriate AST nodes for each value. The resulting AST nodes can be used to build up a larger AST that represents the entire program. This example demonstrates how you can use babel-types.valueToNode to programmatically create AST nodes for various JavaScript values, which can be useful when writing Babel plugins or working with AST nodes directly.

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