How to use the toExpression function from @babel/types

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

@babel/types.toExpression is a function that converts a Babel AST node into an expression node.

JSConcatPackager.js

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  body.push(
    t.expressionStatement(
      t.assignmentExpression(
        '=',
        t.identifier(node.id.name),
        t.toExpression(node)
      )
    )
  );
} else {

helpers.js

GitHub: yoyooyooo/babel-plugin-apollo-helper

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  t.identifier('graphql')
);
return t.callExpression(
  path.scope.bindings.graphql
    ? path.scope.bindings.graphql.identifier
    : t.toExpression(requireNode),
  [
    query,
    t.objectExpression([
      t.objectProperty(

How does @babel/types.toExpression work?

@babel/types.toExpression takes a single argument, node, which is the Babel AST node to convert to an expression node.

The function checks the type of the node argument and applies specific logic based on the node type to convert it to an expression node.

If node is already an expression node, the function simply returns it.

If node is a statement node, the function creates a ExpressionStatement node and sets its expression property to node.expression. This new node is then returned.

If node is a declaration node, the function creates an Identifier node from the declaration's id.name property, and then creates a VariableDeclaration node using this identifier and the declaration's init property as the declarations. Finally, it returns the first declaration's init property as the converted expression node.

Otherwise, if node is not one of the above types, the function throws an error indicating that the node cannot be converted to an expression.

This function can be useful for manipulating AST nodes and converting them to a format that can be used in expression contexts, such as when transforming code.

Ai Example

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

// Create an AST node for a function call expression
const callExpressionNode = t.callExpression(t.identifier("myFunction"), [
  t.stringLiteral("arg1"),
  t.numericLiteral(2),
]);

// Convert the call expression node to an expression node
const expressionNode = t.toExpression(callExpressionNode);

console.log(expressionNode);
// Output: { type: 'CallExpression', callee: { type: 'Identifier', name: 'myFunction' }, arguments: [ { type: 'StringLiteral', value: 'arg1' }, { type: 'NumericLiteral', value: 2 } ] }

In this example, we create an AST node representing a function call expression using the t.callExpression function from @babel/types. We then pass this node to t.toExpression, which converts it to an expression node. Finally, we log the resulting expression node to the console. Note that the resulting expression node is of type CallExpression, which means it can be used in expression contexts, such as when passing a function call as an argument to another function.

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

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