VariableDeclaration AST JavaScript Object

The VariableDeclaration object matches a JavaScript import.

The astType value for this node is variabledeclaration.

Code Pattern

This object catches the following code patterns:

const foo = 42; // javascript
const foo: number = 42; // typescript only

Usage

The following code checks if a variable declaration uses the any type. This is useful for TypeScript.

function visit(node) {
  if (
    node &&
    node.type &&
    node.type.astType === "string" &&
    node.type.value === "any"
  ) {
    const error = buildError(
      node.type.start.line,
      node.type.start.col,
      node.type.end.line,
      node.type.end.col,
      "do not use any type",
      "CRITICAL",
      "SAFETY"
    );
    addError(error);
  }
}

Attributes

• modifier (AstString): the modifier (let, const, var)
• name (AstString): the name of the variable
• type TypeScript only (AstElement, it can be different elements, from a string to more complex objects): the type of the variable. Can be a Type, a TypeOperation or any other node type.
• value (array of AstElement): the value of the variable