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import { ParseError } from './types.ts'import { flag } from './utils.ts'import { ValueError } from './value-errors.ts'
const fmtFlagList = (names: readonly string[]) => names.map(flag).join(' ')
/** * Base class of all `FlagError` */export abstract class FlagError implements ParseError {  public abstract toString(): string}
/** * `FlagError` class for when unknown flags being detected in argument list */export class UnknownFlags extends FlagError {  constructor(    /** Flag names */    public readonly names: readonly string[],  ) {    super()  }
  public toString() {    return `Unknown flags: ${fmtFlagList(this.names)}`  }}
/** * `FlagError` class for when required flags not being specified */export class MissingFlag extends FlagError {  constructor(    /** Flag name */    public readonly name: string,  ) {    super()  }
  public toString() {    return `Flag ${flag(this.name)} is required but missing`  }}
/** * `FlagError` class for when two or more aliases of the same option being specified */export class ConflictFlags extends FlagError {  constructor(    /** Aliases */    public readonly names: readonly string[],  ) {    super()  }
  public toString() {    return `Conflicting options: ${fmtFlagList(this.names)}`  }}
/** * `FlagError` class for when an option flag being specified without a value */export class MissingValue extends FlagError {  constructor(    /** Option name */    public readonly name: string | readonly string[],  ) {    super()  }
  public toString() {    return `Option ${flag(this.name)} requires a value but none was found`  }}
/** * `FlagError` class for when a flag being place where a value is expected */export class UnexpectedFlag extends FlagError {  constructor(    /** Option name */    public readonly name: string | readonly string[],    /** Offender flag (raw form) */    public readonly unexpectedFlag: string,  ) {    super()  }
  public toString() {    return `Option ${      flag(        this.name,      )    } requires a value but received flag ${this.unexpectedFlag} instead`  }}
/** * `FlagError` class for when an argument fails to convert to a value */export class ValueParsingFailure extends FlagError {  constructor(    /** Option name */    public readonly name: string | readonly string[],    /** Value parsing error */    public readonly error: ValueError,  ) {    super()  }
  public toString() {    return `Failed to parse ${flag(this.name)}: ${this.error.toString()}`  }}