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How to use the exportNamedDeclaration function from @babel/types

Find comprehensive JavaScript @babel/types.exportNamedDeclaration code examples handpicked from public code repositorys.

@babel/types.exportNamedDeclaration is a Babel plugin that generates a named export declaration for a given variable declaration.

babel-conditional-preprocess.js

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  let hasExport = false;
  path.node.body.forEach(node => {
    hasExport = hasExport || t.isExportDeclaration(node);
  });
  if (!hasExport) {
    const exportNode = t.exportNamedDeclaration();
    t.addComment(exportNode, 'trailing', 'The above line is generated by conditional compilation, when no export detected after CC.');
    path.node.body.push(exportNode);
  }
}

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typescript.js

GitHub: sergeysova/telegram-typings

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/*:: const { Union, Field, Interface, Method } = require('../store')*/


class TypeScriptBuilder extends AbstractJsBuilder {
  buildUnion(object/*: Union */) {
    const ast = bt.exportNamedDeclaration(
      bt.tSTypeAliasDeclaration(
        bt.identifier(object.name),
        undefined,
        bt.tSUnionType(object.variants.map((name) => (

+ 11 other calls in file

How does @babel/types.exportNamedDeclaration work?

@babel/types.exportNamedDeclaration is a plugin for the Babel JavaScript compiler that generates a named export declaration for a given variable declaration.

When a variable is declared in a module, it is not automatically available to other modules unless it is explicitly exported. The exportNamedDeclaration plugin allows you to automatically generate a named export declaration for a given variable declaration, simplifying the process of sharing variables between modules.

To use the plugin, you must first install it as a dependency in your project:

sql
npm install @babel/types --save-dev

You can then configure Babel to use the plugin by adding it to your Babel configuration file (usually .babelrc):

perl
{
  "plugins": [
    "@babel/types/exportNamedDeclaration"
  ]
}

Once the plugin is configured, you can use it to generate named export declarations for your variable declarations. For example, the following code:

arduino
const myVar = "Hello, World!";

Can be transformed by the exportNamedDeclaration plugin into:

arduino
export const myVar = "Hello, World!";

This allows other modules to import the myVar variable using a named import declaration:

javascript
import { myVar } from './my-module';

Overall, the exportNamedDeclaration plugin provides a convenient way to generate named export declarations for your variable declarations, simplifying the process of sharing variables between modules and improving the modularity and maintainability of your code.

index.js

GitHub: openapi/preset-effector

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const contractName =
  changeCase.camelCase(name) + changeCase.pascalCase(status[code].code);
const contract = responses[code].content
  ? createContract(responses[code].content['application/json'].schema)
  : createNullContract();
const ast = t.exportNamedDeclaration(
  t.variableDeclaration('const', [
    t.variableDeclarator(t.identifier(contractName), contract),
  ]),
);

+ 29 other calls in file

main-entry.js

GitHub: niksy/modernizr-esm

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/*
 * Export `addTest` and `createAsyncTestListener` as named exports
 * so they can be used in async tests
 */
path.pushContainer('body', [
    t.exportNamedDeclaration(null, [
        t.exportSpecifier(
            t.identifier('addTest'),
            t.identifier('addTest')
        ),

+ 7 other calls in file

Ai Example

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

const code = `const myVar = "Hello, World!";`;

const ast = babel.parseSync(code);
const declaration = ast.program.body[0];

const exportDeclaration = t.exportNamedDeclaration(declaration);

ast.program.body[0] = exportDeclaration;

const output = babel.transformFromAstSync(ast, code);

console.log(output.code); // "export const myVar = "Hello, World!";"

In this example, we first import the @babel/core and @babel/types modules using require. We then define a string code containing a variable declaration. Next, we parse the code using the parseSync method of @babel/core, which returns an abstract syntax tree (AST) representing the code. We extract the variable declaration from the AST by accessing the program.body[0] property. We then use the exportNamedDeclaration function of @babel/types to generate a named export declaration for the variable declaration. We replace the original variable declaration in the AST with the generated export declaration. Finally, we use the transformFromAstSync method of @babel/core to transform the modified AST back into code. The output of the script will be "export const myVar = "Hello, World!";", which is a valid named export declaration for the myVar variable. This example demonstrates how @babel/types.exportNamedDeclaration can be used to generate named export declarations for variable declarations in a programmatic way.

index.js

GitHub: SheikhSajid/jsx2svelte

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function getExportNodeForProp(propName) {
  const identifier = t.identifier(propName);
  const vDeclarator = t.variableDeclarator(identifier);
  const vDeclaration = t.variableDeclaration('let', [vDeclarator]);
  const namedExport = t.exportNamedDeclaration(vDeclaration, [], null);

  return namedExport;
}

+ 9 other calls in file

index.js

GitHub: jacksplwxy/miniprogram-to-vue3

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// Check if this name is reserved, if so, then bail out.
if (check(name)) {
  return;
}

const decl = t.exportNamedDeclaration(
  t.variableDeclaration("let", [
    t.variableDeclarator(
      path.node.left.property,
      t.memberExpression(

+ 58 other calls in file

RelayFlowBabelFactories.js

GitHub: Avivhdr/relay

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/**
 * export type {A, B, C}
 */
function exportTypes(names: $ReadOnlyArray<string>): $FlowFixMe {
  const res = t.exportNamedDeclaration(
    undefined,
    names.map(name =>
      t.exportSpecifier(t.identifier(name), t.identifier(name)),
    ),

+ 3 other calls in file

babel-plugin-transform-modules-commonjs-ec.js

GitHub: mmbbz6/qianhouduan

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        declaration.node.id = declaration.scope.generateUidIdentifier('default');
    }
}
else {
    const id = declaration.scope.generateUidIdentifier('default');
    const namedDecl = babelTypes.exportNamedDeclaration(null, [
        babelTypes.exportSpecifier(babelTypes.identifier(id.name), babelTypes.identifier('default')),
    ]);
    namedDecl._blockHoist = child.node._blockHoist;

codegen.js

GitHub: fadi12321/test-for-deep-8

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t.program([
  t.importDeclaration(
    exportNames.map((n) => t.importSpecifier(t.identifier(n), t.identifier(n))),
    t.stringLiteral(source)
  ),
  t.exportNamedDeclaration(
    t.variableDeclaration('const', [
      t.variableDeclarator(
        t.identifier(nsName),
        t.objectExpression(

+ 224 other calls in file

Other functions in @babel/types

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@babel/types.identifier is the most popular function in @babel/types (20936 examples)

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