babel-helper-builder-binary-assignment-operator-visitor

import { declare } from '@babel/helper-plugin-utils'; import { buildBinaryAssignmentOperatorVisitor } from '@babel/helper-builder-binary-assignment-operator-visitor'; export default declare((api, options) => { api.assertVersion(7); // This helper builds a visitor that handles binary and assignment operators. // It can simplify transformations for operators like `+=`, `-=`, `&&=`, `??=` etc. // The helper typically expects a 'kind' (binary or assignment) and a map of operators // to visitor methods. Since the README is a TODO, this is an illustrative example // based on common Babel plugin patterns. // Example: A plugin to replace all `+=` operators with a function call. // This specific helper might be overkill for just one operator, but shows the pattern. // In a real scenario, you'd define methods for multiple operators. const visitor = buildBinaryAssignmentOperatorVisitor({ operator(path) { // `path` is a NodePath for the operator expression (e.g., BinaryExpression, AssignmentExpression). const { node } = path; if (node.operator === '+=' && node.type === 'AssignmentExpression') { // Transform 'a += b' into 'assignAndAdd(a, b)' path.replaceWith( api.types.callExpression( api.types.identifier('assignAndAdd'), [node.left, node.right] ) ); } }, // More specific operator handlers could be defined here // '+=_assignment'(path) { /* ... */ }, // '+_binary'(path) { /* ... */ } }); return { name: 'transform-binary-assignment-operators', visitor: { // The visitor is returned directly from the helper. // It usually contains handlers for 'BinaryExpression' and 'AssignmentExpression'. ...visitor }, }; });