eslint-plugin-de-morgan/dist/utils/has-operator.js

ESLint plugin for transforming negated boolean expressions via De Morgan’s laws

/**
 * Creates a predicate function that checks if an AST node has a specific
 * operator.
 *
 * @example
 *
 * ```ts
 * const isAnd = hasOperator('&&')
 * isAnd({ type: 'LogicalExpression', operator: '&&' }) // returns true
 * ```
 *
 * @example
 *
 * ```ts
 * const isNot = hasOperator('!')
 * isNot({ type: 'UnaryExpression', operator: '!' }) // returns true
 * ```
 *
 * @param operator - The operator to check for. For LogicalOperator: `&&`, `||`,
 *   `??` For UnaryOperator: `-`, `+`, `!`, `~`, `typeof`, etc.
 * @returns A predicate function that:
 *
 *   - Takes a LogicalExpression or UnaryExpression node
 *   - Returns `true` if the node's operator matches the specified operator
 *   - Returns `false` otherwise.
 */
function hasOperator(operator) {
  return node => node.operator === operator
}
export { hasOperator }