eslint-codemod-utils/dist/esm/utils/get-identifier-in-parent-scope.js

A collection of AST helper functions for more complex ESLint rule fixes.

/**
 * A useful function for finding a variable / variables value. This function
 * traverses the scopes upwards until it arrives at the global scope. It will
 * return when it exhausts the scopes or finds the variable.
 *
 * @param scope The current scope the variable exists in:
 * @param identifierName The identifier / variable we're trying to look up
 * @returns
 */
export function getIdentifierInParentScope(scope, identifierName) {
    let traversingScope = scope;
    while (traversingScope && traversingScope.type !== 'global') {
        const matchedVariable = traversingScope.variables.find((variable) => variable.name === identifierName);
        if (matchedVariable) {
            return matchedVariable;
        }
        traversingScope = traversingScope.upper;
    }
    return null;
}