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How to use the nullLiteral function from @babel/types

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

@babel/types.nullLiteral is a function in the @babel/types library that creates an abstract syntax tree (AST) node representing a null literal value.

ClassFile.js

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  return expr;
}


function literalValueToExpression(value) {
  if (value === null || value === undefined) {
    return types.nullLiteral();
  }
  if (typeof value == "boolean") {
    return types.booleanLiteral(value);
  }

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+ 43 other calls in file

stringifyObject.js

GitHub: browserslist/caniuse-lite

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  return t.identifier(encoded)
}

function stringifyRecursive(data) {
  if (data === null) {
    return t.nullLiteral()
  } else if (typeof data === 'undefined') {
    return t.identifier('undefined')
  } else if (typeof data === 'string') {
    return t.stringLiteral(data)

452

+ 5 other calls in file

How does @babel/types.nullLiteral work?

@babel/types.nullLiteral is a function in the @babel/types library that creates an abstract syntax tree (AST) node representing a null literal value. The null literal represents an intentional absence of any object value, and is often used to indicate a missing or undefined value. Here's the basic syntax of using @babel/types.nullLiteral: javascript Copy code {{{{{{{ const t = require('@babel/types'); const astNode = t.nullLiteral(); In this example, t.nullLiteral() is being called to create a new AST node representing a null literal value. The t.nullLiteral() function takes no arguments and simply returns a new AST node object with type NullLiteral. The resulting astNode object can then be used in various ways, such as being passed to other functions or being used to build up a larger AST representing a JavaScript program. Overall, @babel/types.nullLiteral provides a simple and convenient way to create an AST node representing a null literal value, which can be useful when constructing or transforming JavaScript code programmatically.

list.js

GitHub: raxjs/miniapp

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const listBlock = createJSX('block', listAttr,
  [/^JSX.*/g.test(returnEl.type) ? returnEl : t.jsxExpressionContainer(returnEl)]
);

listKeyProps[renamedIndex.name] = {
  originalKey: jsxList.definedKey ? parseExpression(jsxList.definedKey) : t.nullLiteral(),
  renamedKey,
  parentNode: jsxList.loopFnBody.body
};

+ 13 other calls in file

index.js

GitHub: nodejh/sequelize-automate

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  if (_.isNumber(defaultValue)) {
    return t.numericLiteral(defaultValue);
  }

  return t.nullLiteral();
}

function processFieldProperties(field) {
  const properties = [];

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+ 15 other calls in file

Ai Example

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

const astNode = t.nullLiteral();

In this example, we're using @babel/types.nullLiteral to create a new AST node object representing a null literal value. The resulting astNode object will have a type of NullLiteral, indicating that it represents the JavaScript null literal value. This AST node can be used in various ways, such as being passed to other functions or being used to build up a larger AST representing a JavaScript program. For example, we could use this AST node to create a new variable declaration with a null value: javascript Copy code

utils.js

GitHub: Aedron/babel-plugin-jsx-if-directive

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    removeAttrASTByIndex(node, index);

    const targetAST = t.conditionalExpression(
        attrBinding.value.expression,
        node,
        t.nullLiteral()
    );
    path.replaceWith(targetAST);
}

+ 2 other calls in file

transformNode.js

GitHub: justinwilaby/babel-plugin-jsx-adaptive-cards

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  }
}

function transformTextBlock(textElement, scope) {
  if (!textElement) {
    return t.nullLiteral;
  }
  const nodes = (textElement.text || textElement);
  if (nodes.length === 1 && t.isJSXText(nodes[0])) {
    return t.stringLiteral(normalizeWhitespace(nodes[0].value));

+ 3 other calls in file

directives.js

GitHub: icai/vue-to-react

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parentPath.replaceWith(
    t.jSXExpressionContainer(
        t.conditionalExpression(
            test,
            parentPath.node,
            nextElement ? nextElement : t.nullLiteral()
        )
    )
);

editor.tsx

GitHub: suchipi/tofu

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if (t.isBlock(node) && key == '(') {
  this.updateCode({
    code:
      code.slice(0, start) +
      generate(t.arrowFunctionExpression([], t.nullLiteral())).code +
      code.slice(end)
  });
  event.preventDefault();
  return;

+ 11 other calls in file

actions.ts

GitHub: suchipi/tofu

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  isInCollectionExpression([start, end])
);
const collection = parents[collectionIndex];
const node = parents[parents.length - 1];
const [childKey, init] = {
  ArrayExpression: ['elements', t.nullLiteral()],
  ArrowFunctionExpression: ['params', t.identifier('p')],
  CallExpression: ['arguments', t.nullLiteral()],
  ObjectExpression: [
    'properties',

+ 17 other calls in file

index.js

GitHub: gxlmyacc/react-vue-like

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switch (typeof v) {
  case 'string': return t.stringLiteral(v);
  case 'boolean': return t.booleanLiteral(v);
  case 'number': return t.numericLiteral(v);
  case 'object':
    if (v === null) return t.nullLiteral();
    if (v instanceof RegExp) return t.regExpLiteral(v.source, v.flags);
    if (v instanceof Date) return template('new Date(TIME)')({ TIME: t.numericLiteral(v.getTime()) });
    if (v instanceof Function) return template(v.toString())();
    return obj2Expression(v, parent);

+ 8 other calls in file

swagql.js

GitHub: groupon/swagql

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  VERIFY_AUTH_STATUS: t.identifier('VERIFY_AUTH_STATUS'),
});
const postfix = buildPostfix({
  QUERY_FIELDS: this.queryFields.size
    ? t.objectExpression(Array.from(this.queryFields.values()))
    : t.nullLiteral(),
  MUTATION_FIELDS: this.mutationFields.size
    ? t.objectExpression(Array.from(this.mutationFields.values()))
    : t.nullLiteral(),

+ 3 other calls in file

index.js

GitHub: nerodesu017/antibot-incapsula

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if (kind === 'var') {
  for (let declaration of path.node.declarations) {
    switch (declaration.id.type) {
      case "Identifier":
        let left_side = types.memberExpression(types.identifier('global'), types.identifier(declaration.id.name));
        let right_side = (declaration.init === null) ? types.nullLiteral() : declaration.init;
        let varToGlobal = types.expressionStatement(
          types.assignmentExpression('=', left_side, right_side));
        newDeclarations.push(varToGlobal);
    }

+ 3 other calls in file

index.js

GitHub: limesquid/r-factor

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disconnectMergeProps() {
  this.updateDetails();
  const { connectCallExpressionPath, hasMergeProps, mergePropsName, scope } = this.details;
  if (hasMergeProps) {
    removeBinding(scope, mergePropsName);
    connectCallExpressionPath.node.arguments[2] = nullLiteral();
    this.cleanConnect();
  }
  return this;
}

+ 56 other calls in file

index.js

GitHub: mozilla/script_review_utils

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    newNode = null
  } else {
    newNode = t.numericLiteral(literal.value)
  }
} else if (t.isNullLiteral(literal)) {
  newNode = t.nullLiteral()
} else if (t.isBooleanLiteral(literal)) {
  newNode = t.booleanLiteral(literal.value)
} else {
  // leave it alone

_utils.js

GitHub: iammadanlal/next-blog

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  if (t.isMemberExpression(node.argument) || t.isIdentifier(node.argument)) {
    var name = node.argument.name;
    var spreadObj = t.isMemberExpression(node.argument) ? node.argument : t.identifier(name);
    var attrNameDotClassName = t.memberExpression(spreadObj, t.identifier('className'));
    spreads.push( // `${name} && ${name}.className != null && ${name}.className`
    and(spreadObj, and(t.binaryExpression('!=', attrNameDotClassName, t.nullLiteral()), attrNameDotClassName)));
  }

  continue;
}

stringifyObject.js

GitHub: deepin-community/node-caniuse-lite

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function stringify(list) {
  return Object.keys(list).reduce((ast, key) => {
    let data = list[key]
    let value
    if (data === null) {
      value = t.nullLiteral()
    } else if (typeof data === 'undefined') {
      value = t.identifier('undefined')
    } else if (typeof data === 'string') {
      value = t.stringLiteral(data)

+ 347 other calls in file

xsParser.js

GitHub: codeteenager/miniprogram-engine

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  oldProperty
),
babelTypes.conditionalExpression(
  babelTypes.binaryExpression(
    '==',
    babelTypes.nullLiteral(),
    babelTypes.identifier(tmpVar)
  ),
  babelTypes.identifier('undefined'),
  babelTypes.conditionalExpression(

+ 10 other calls in file

index.js

GitHub: john024x/TiendaAvocado

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let attribs = openingPath.node.attributes;

if (attribs.length) {
  attribs = buildOpeningElementAttributes(attribs, file);
} else {
  attribs = t.nullLiteral();
}

args.push(attribs, ...path.node.children);

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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