class CucumberExpressionError extends Error {} class AmbiguousParameterTypeError extends CucumberExpressionError { static forConstructor( keyName, keyValue, parameterTypes, generatedExpressions ) { return new this( `parameter type with ${keyName}=${keyValue} is used by several parameter types: ${parameterTypes}, ${generatedExpressions}` ) } static forRegExp( parameterTypeRegexp, expressionRegexp, parameterTypes, generatedExpressions ) { return new this( `Your Regular Expression ${expressionRegexp} matches multiple parameter types with regexp ${parameterTypeRegexp}: ${this._parameterTypeNames(parameterTypes)} I couldn't decide which one to use. You have two options: 1) Use a Cucumber Expression instead of a Regular Expression. Try one of these: ${this._expressions(generatedExpressions)} 2) Make one of the parameter types preferential and continue to use a Regular Expression. ` ) } static _parameterTypeNames(parameterTypes) { return parameterTypes.map(p => `{${p.name}}`).join('\n ') } static _expressions(generatedExpressions) { return generatedExpressions.map(e => e.source).join('\n ') } } class UndefinedParameterTypeError extends CucumberExpressionError { constructor(typeName) { super(`Undefined parameter type {${typeName}}`) } } module.exports = { AmbiguousParameterTypeError, UndefinedParameterTypeError, CucumberExpressionError, }