ts-pattern/dist/index.cjs.map

The exhaustive Pattern Matching library for TypeScript.

{"version":3,"file":"index.cjs","sources":["../src/internals/symbols.ts","../src/internals/helpers.ts","../src/is-matching.ts","../src/patterns.ts","../src/errors.ts","../src/match.ts"],"sourcesContent":["/**\n * Symbols used internally within ts-pattern to construct and discriminate\n * Guard, Not, and Select, and AnonymousSelect patterns\n *\n * Symbols have the advantage of not appearing in auto-complete suggestions in\n * user defined patterns, and eliminate the risk of property\n * overlap between ts-pattern internals and user defined patterns.\n *\n * These symbols have to be visible to tsc for type inference to work, but\n * users should not import them\n * @module\n * @private\n * @internal\n */\n\nexport const matcher = Symbol.for('@ts-pattern/matcher');\nexport type matcher = typeof matcher;\n\nexport const unset = Symbol.for('@ts-pattern/unset');\nexport type unset = typeof unset;\n\nexport const isVariadic = Symbol.for('@ts-pattern/isVariadic');\nexport type isVariadic = typeof isVariadic;\n\n// can't be a symbol because this key has to be enumerable.\nexport const anonymousSelectKey = '@ts-pattern/anonymous-select-key';\nexport type anonymousSelectKey = typeof anonymousSelectKey;\n\nexport const override = Symbol.for('@ts-pattern/override');\nexport type override = typeof override;\n","/**\n * @module\n * @private\n * @internal\n */\n\nimport * as symbols from './symbols';\nimport { SelectionType } from '../types/FindSelected';\nimport { Pattern, Matcher, MatcherType, AnyMatcher } from '../types/Pattern';\n\n// @internal\nexport const isObject = (value: unknown): value is Object =>\n  Boolean(value && typeof value === 'object');\n\n//   @internal\nexport const isMatcher = (\n  x: unknown\n): x is Matcher<unknown, unknown, MatcherType, SelectionType> => {\n  const pattern = x as Matcher<unknown, unknown, MatcherType, SelectionType>;\n  return pattern && !!pattern[symbols.matcher];\n};\n\n// @internal\nconst isOptionalPattern = (\n  x: unknown\n): x is Matcher<unknown, unknown, 'optional', SelectionType> => {\n  return isMatcher(x) && x[symbols.matcher]().matcherType === 'optional';\n};\n\n// tells us if the value matches a given pattern.\n// @internal\nexport const matchPattern = (\n  pattern: any,\n  value: any,\n  select: (key: string, value: unknown) => void\n): boolean => {\n  if (isMatcher(pattern)) {\n    const matcher = pattern[symbols.matcher]();\n    const { matched, selections } = matcher.match(value);\n    if (matched && selections) {\n      Object.keys(selections).forEach((key) => select(key, selections[key]));\n    }\n    return matched;\n  }\n\n  if (isObject(pattern)) {\n    if (!isObject(value)) return false;\n\n    // Tuple pattern\n    if (Array.isArray(pattern)) {\n      if (!Array.isArray(value)) return false;\n      let startPatterns = [];\n      let endPatterns = [];\n      let variadicPatterns: AnyMatcher[] = [];\n\n      for (const i of pattern.keys()) {\n        const subpattern = pattern[i];\n        if (isMatcher(subpattern) && subpattern[symbols.isVariadic]) {\n          variadicPatterns.push(subpattern);\n        } else if (variadicPatterns.length) {\n          endPatterns.push(subpattern);\n        } else {\n          startPatterns.push(subpattern);\n        }\n      }\n\n      if (variadicPatterns.length) {\n        if (variadicPatterns.length > 1) {\n          throw new Error(\n            `Pattern error: Using \\`...P.array(...)\\` several times in a single pattern is not allowed.`\n          );\n        }\n\n        if (value.length < startPatterns.length + endPatterns.length) {\n          return false;\n        }\n\n        const startValues = value.slice(0, startPatterns.length);\n        const endValues =\n          endPatterns.length === 0 ? [] : value.slice(-endPatterns.length);\n        const middleValues = value.slice(\n          startPatterns.length,\n          endPatterns.length === 0 ? Infinity : -endPatterns.length\n        );\n\n        return (\n          startPatterns.every((subPattern, i) =>\n            matchPattern(subPattern, startValues[i], select)\n          ) &&\n          endPatterns.every((subPattern, i) =>\n            matchPattern(subPattern, endValues[i], select)\n          ) &&\n          (variadicPatterns.length === 0\n            ? true\n            : matchPattern(variadicPatterns[0], middleValues, select))\n        );\n      }\n\n      return pattern.length === value.length\n        ? pattern.every((subPattern, i) =>\n            matchPattern(subPattern, value[i], select)\n          )\n        : false;\n    }\n\n    return Reflect.ownKeys(pattern).every((k): boolean => {\n      const subPattern = pattern[k];\n\n      return (\n        (k in value || isOptionalPattern(subPattern)) &&\n        matchPattern(subPattern, value[k], select)\n      );\n    });\n  }\n\n  return Object.is(value, pattern);\n};\n\n// @internal\nexport const getSelectionKeys = (pattern: any): string[] => {\n  if (isObject(pattern)) {\n    if (isMatcher(pattern)) {\n      return pattern[symbols.matcher]().getSelectionKeys?.() ?? [];\n    }\n    if (Array.isArray(pattern)) return flatMap(pattern, getSelectionKeys);\n    return flatMap(Object.values(pattern), getSelectionKeys);\n  }\n  return [];\n};\n\n// @internal\nexport const flatMap = <a, b>(\n  xs: readonly a[],\n  f: (v: a) => readonly b[]\n): b[] => xs.reduce<b[]>((acc, x) => acc.concat(f(x)), []);\n","import { MatchedValue, Pattern, UnknownProperties } from './types/Pattern';\nimport * as P from './patterns';\nimport { matchPattern } from './internals/helpers';\nimport { WithDefault } from './types/helpers';\n\n/**\n * This constraint allows using additional properties\n * in object patterns. See \"should allow targetting unknown properties\"\n * unit test in `is-matching.test.ts`.\n */\ntype PatternConstraint<T> = T extends readonly any[]\n  ? P.Pattern<T>\n  : T extends object\n  ? P.Pattern<T> & UnknownProperties\n  : P.Pattern<T>;\n\n/**\n * `isMatching` takes pattern and returns a **type guard** function, cheching if a value matches this pattern.\n *\n * [Read  documentation for `isMatching` on GitHub](https://github.com/gvergnaud/ts-pattern#ismatching)\n *\n * @example\n *  const hasName = isMatching({ name: P.string })\n *\n *  declare let input: unknown\n *\n *  if (hasName(input)) {\n *    // `input` inferred as { name: string }\n *    return input.name\n *  }\n */\nexport function isMatching<const p extends Pattern<unknown>>(\n  pattern: p\n): (value: unknown) => value is P.infer<p>;\n/**\n * `isMatching` takes pattern and a value and checks if the value matches this pattern.\n *\n * [Read  documentation for `isMatching` on GitHub](https://github.com/gvergnaud/ts-pattern#ismatching)\n *\n * @example\n *  declare let input: unknown\n *\n *  if (isMatching({ name: P.string }, input)) {\n *    // `input` inferred as { name: string }\n *    return input.name\n *  }\n */\nexport function isMatching<const T, const P extends PatternConstraint<T>>(\n  pattern: P,\n  value: T\n): value is T & WithDefault<P.narrow<T, P>, P.infer<P>>;\n\nexport function isMatching<const p extends Pattern<any>>(\n  ...args: [pattern: p, value?: any]\n): boolean | ((vale: any) => boolean) {\n  if (args.length === 1) {\n    const [pattern] = args;\n    return (value: any): value is MatchedValue<any, P.infer<p>> =>\n      matchPattern(pattern, value, () => {});\n  }\n  if (args.length === 2) {\n    const [pattern, value] = args;\n    return matchPattern(pattern, value, () => {});\n  }\n\n  throw new Error(\n    `isMatching wasn't given the right number of arguments: expected 1 or 2, received ${args.length}.`\n  );\n}\n","/**\n * The `P` module contains patterns for primitive types, wildcards and\n * other pattern-matching utilities.\n *\n * @module\n */\n\nimport { matchPattern, getSelectionKeys, flatMap } from './internals/helpers';\nimport * as symbols from './internals/symbols';\nimport { matcher } from './internals/symbols';\nimport { isMatching } from './is-matching';\nimport { ExtractPreciseValue } from './types/ExtractPreciseValue';\nimport { Fn } from './types/helpers';\nimport { InvertPattern } from './types/InvertPattern';\nimport {\n  Pattern,\n  UnknownPattern,\n  OptionalP,\n  ArrayP,\n  MapP,\n  SetP,\n  AndP,\n  OrP,\n  NotP,\n  GuardP,\n  SelectP,\n  AnonymousSelectP,\n  GuardExcludeP,\n  CustomP,\n  Matcher,\n  StringPattern,\n  AnyPattern,\n  NumberPattern,\n  BooleanPattern,\n  BigIntPattern,\n  NullishPattern,\n  SymbolPattern,\n  Chainable,\n  BigIntChainable,\n  NumberChainable,\n  StringChainable,\n  ArrayChainable,\n  Variadic,\n  NonNullablePattern,\n} from './types/Pattern';\n\nexport type {\n  /**\n   * `Pattern<T>` is the type of all patterns\n   * that can match a value of type `T`.\n   */\n  Pattern,\n\n  /**\n   * `unstable_Fn` can be used to created a\n   * a Matchable instance – a custom type that\n   * can be used as a pattern.\n   *\n   * @experimental This feature is unstable.\n   */\n  Fn as unstable_Fn,\n};\n\nexport { matcher };\n\n/**\n * A `Matchable` is an object implementing\n * the Matcher Protocol. It must have a `[P.matcher]: P.Matcher<NarrowFn>`\n * key, which defines how this object should be matched by TS-Pattern.\n *\n * @experimental This feature is unstable.\n *\n * @example\n * ```ts\n * class Some<T> implements P.unstable_Matchable {\n *  [P.matcher](): P.unstable_Matcher<Some<T>>\n * }\n * ```\n */\nexport type unstable_Matchable<\n  narrowedOrFn,\n  input = unknown,\n  pattern = never\n> = CustomP<input, pattern, narrowedOrFn>;\n\n/**\n * A `Matcher` is an object with `match` function, which\n * defines how this object should be matched by TS-Pattern.\n *\n * @experimental This feature is unstable.\n *\n * @example\n * ```ts\n * class Some<T> implements P.unstable_Matchable {\n *  [P.matcher](): P.unstable_Matcher<Some<T>>\n * }\n * ```\n */\nexport type unstable_Matcher<\n  narrowedOrFn,\n  input = unknown,\n  pattern = never\n> = ReturnType<CustomP<input, pattern, narrowedOrFn>[matcher]>;\n\n/**\n * `P.infer<typeof somePattern>` will return the type of the value\n * matched by this pattern.\n *\n * [Read the documentation for `P.infer` on GitHub](https://github.com/gvergnaud/ts-pattern#pinfer)\n *\n * @example\n * const userPattern = { name: P.string }\n * type User = P.infer<typeof userPattern>\n */\nexport type infer<pattern> = InvertPattern<NoInfer<pattern>, unknown>;\n\n/**\n * `P.narrow<Input, Pattern>` will narrow the input type to only keep\n * the set of values that are compatible with the provided pattern type.\n *\n * [Read the documentation for `P.narrow` on GitHub](https://github.com/gvergnaud/ts-pattern#pnarrow)\n *\n * @example\n * type Input = ['a' | 'b' | 'c', 'a' | 'b' | 'c']\n * const Pattern = ['a', P.union('a', 'b')] as const\n *\n * type Narrowed = P.narrow<Input, typeof Pattern>\n * //     ^? ['a', 'a' | 'b']\n */\nexport type narrow<input, pattern> = ExtractPreciseValue<\n  input,\n  InvertPattern<pattern, input>\n>;\n\nfunction chainable<pattern extends Matcher<any, any, any, any, any>>(\n  pattern: pattern\n): Chainable<pattern> {\n  return Object.assign(pattern, {\n    optional: () => optional(pattern),\n    and: (p2: any) => intersection(pattern, p2),\n    or: (p2: any) => union(pattern, p2),\n    select: (key: any) =>\n      key === undefined ? select(pattern) : select(key, pattern),\n  }) as Chainable<pattern>;\n}\n\nconst variadic = <pattern extends {}>(pattern: pattern): Variadic<pattern> =>\n  Object.assign(pattern, {\n    [Symbol.iterator](): Iterator<pattern, void, undefined> {\n      let i = 0;\n      const variadicPattern = Object.assign(pattern, {\n        [symbols.isVariadic]: true,\n      });\n      const values: IteratorResult<pattern, void>[] = [\n        { value: variadicPattern, done: false },\n        { done: true, value: undefined },\n      ];\n      return {\n        next: () => values[i++] ?? values.at(-1)!,\n      };\n    },\n  });\n\nfunction arrayChainable<pattern extends Matcher<any, any, any, any, any>>(\n  pattern: pattern\n): ArrayChainable<pattern> {\n  return Object.assign(variadic(pattern), {\n    optional: () => arrayChainable(optional(pattern)),\n    select: (key: any) =>\n      arrayChainable(\n        key === undefined ? select(pattern) : select(key, pattern)\n      ),\n  }) as any;\n}\n\n/**\n * `P.optional(subpattern)` takes a sub pattern and returns a pattern which matches if the\n * key is undefined or if it is defined and the sub pattern matches its value.\n *\n * [Read the documentation for `P.optional` on GitHub](https://github.com/gvergnaud/ts-pattern#poptional-patterns)\n *\n * @example\n *  match(value)\n *   .with({ greeting: P.optional('Hello') }, () => 'will match { greeting?: \"Hello\" }')\n */\nexport function optional<\n  input,\n  const pattern extends unknown extends input ? UnknownPattern : Pattern<input>\n>(pattern: pattern): Chainable<OptionalP<input, pattern>, 'optional'> {\n  return chainable({\n    [matcher]() {\n      return {\n        match: <UnknownInput>(value: UnknownInput | input) => {\n          let selections: Record<string, unknown[]> = {};\n          const selector = (key: string, value: any) => {\n            selections[key] = value;\n          };\n          if (value === undefined) {\n            getSelectionKeys(pattern).forEach((key) =>\n              selector(key, undefined)\n            );\n            return { matched: true, selections };\n          }\n          const matched = matchPattern(pattern, value, selector);\n          return { matched, selections };\n        },\n        getSelectionKeys: () => getSelectionKeys(pattern),\n        matcherType: 'optional',\n      };\n    },\n  });\n}\n\ntype UnwrapArray<xs> = xs extends readonly (infer x)[] ? x : never;\n\ntype UnwrapSet<xs> = xs extends Set<infer x> ? x : never;\n\ntype UnwrapMapKey<xs> = xs extends Map<infer k, any> ? k : never;\n\ntype UnwrapMapValue<xs> = xs extends Map<any, infer v> ? v : never;\n\ntype WithDefault<a, b> = [a] extends [never] ? b : a;\n\n/**\n * `P.array(subpattern)` takes a sub pattern and returns a pattern, which matches\n * arrays if all their elements match the sub pattern.\n *\n * [Read the documentation for `P.array` on GitHub](https://github.com/gvergnaud/ts-pattern#parray-patterns)\n *\n * @example\n *  match(value)\n *   .with({ users: P.array({ name: P.string }) }, () => 'will match { name: string }[]')\n */\nexport function array<input>(): ArrayChainable<ArrayP<input, unknown>>;\nexport function array<\n  input,\n  const pattern extends Pattern<WithDefault<UnwrapArray<input>, unknown>>\n>(pattern: pattern): ArrayChainable<ArrayP<input, pattern>>;\nexport function array(\n  ...args: [pattern?: any]\n): ArrayChainable<ArrayP<any, any>> {\n  return arrayChainable({\n    [matcher]() {\n      return {\n        match: (value: any) => {\n          if (!Array.isArray(value)) return { matched: false };\n\n          if (args.length === 0) return { matched: true };\n\n          const pattern = args[0];\n          let selections: Record<string, unknown[]> = {};\n\n          if (value.length === 0) {\n            getSelectionKeys(pattern).forEach((key) => {\n              selections[key] = [];\n            });\n            return { matched: true, selections };\n          }\n\n          const selector = (key: string, value: unknown) => {\n            selections[key] = (selections[key] || []).concat([value]);\n          };\n\n          const matched = value.every((v) =>\n            matchPattern(pattern, v, selector)\n          );\n\n          return { matched, selections };\n        },\n        getSelectionKeys: () =>\n          args.length === 0 ? [] : getSelectionKeys(args[0]),\n      };\n    },\n  });\n}\n\n/**\n * `P.set(subpattern)` takes a sub pattern and returns a pattern that matches\n * sets if all their elements match the sub pattern.\n *\n * [Read `P.set` documentation on GitHub](https://github.com/gvergnaud/ts-pattern#pset-patterns)\n *\n * @example\n *  match(value)\n *   .with({ users: P.set(P.string) }, () => 'will match Set<string>')\n */\nexport function set<input>(): Chainable<SetP<input, unknown>>;\nexport function set<\n  input,\n  const pattern extends Pattern<WithDefault<UnwrapSet<input>, unknown>>\n>(pattern: pattern): Chainable<SetP<input, pattern>>;\nexport function set<\n  input,\n  const pattern extends Pattern<WithDefault<UnwrapSet<input>, unknown>>\n>(...args: [pattern?: pattern]): Chainable<SetP<input, pattern>> {\n  return chainable({\n    [matcher]() {\n      return {\n        match: <UnknownInput>(value: UnknownInput | input) => {\n          if (!(value instanceof Set)) return { matched: false };\n\n          let selections: Record<string, unknown[]> = {};\n\n          if (value.size === 0) {\n            return { matched: true, selections };\n          }\n\n          if (args.length === 0) return { matched: true };\n\n          const selector = (key: string, value: unknown) => {\n            selections[key] = (selections[key] || []).concat([value]);\n          };\n\n          const pattern = args[0];\n\n          const matched = setEvery(value, (v) =>\n            matchPattern(pattern, v, selector)\n          );\n\n          return { matched, selections };\n        },\n        getSelectionKeys: () =>\n          args.length === 0 ? [] : getSelectionKeys(args[0]),\n      };\n    },\n  });\n}\n\nconst setEvery = <T>(set: Set<T>, predicate: (value: T) => boolean) => {\n  for (const value of set) {\n    if (predicate(value)) continue;\n    return false;\n  }\n  return true;\n};\n\n/**\n * `P.map(keyPattern, valuePattern)` takes a subpattern to match against the\n * key, a subpattern to match against the value and returns a pattern that\n * matches on maps where all elements inside the map match those two\n * subpatterns.\n *\n * [Read `P.map` documentation on GitHub](https://github.com/gvergnaud/ts-pattern#pmap-patterns)\n *\n * @example\n *  match(value)\n *   .with({ users: P.map(P.map(P.string, P.number)) }, (map) => `map's type is Map<string, number>`)\n */\nexport function map<input>(): Chainable<MapP<input, unknown, unknown>>;\nexport function map<\n  input,\n  const pkey extends Pattern<WithDefault<UnwrapMapKey<input>, unknown>>,\n  const pvalue extends Pattern<WithDefault<UnwrapMapValue<input>, unknown>>\n>(patternKey: pkey, patternValue: pvalue): Chainable<MapP<input, pkey, pvalue>>;\nexport function map<\n  input,\n  const pkey extends Pattern<WithDefault<UnwrapMapKey<input>, unknown>>,\n  const pvalue extends Pattern<WithDefault<UnwrapMapValue<input>, unknown>>\n>(\n  ...args: [patternKey?: pkey, patternValue?: pvalue]\n): Chainable<MapP<input, pkey, pvalue>> {\n  return chainable({\n    [matcher]() {\n      return {\n        match: <UnknownInput>(value: UnknownInput | input) => {\n          if (!(value instanceof Map)) return { matched: false };\n\n          let selections: Record<string, unknown[]> = {};\n\n          if (value.size === 0) {\n            return { matched: true, selections };\n          }\n\n          const selector = (key: string, value: unknown) => {\n            selections[key] = (selections[key] || []).concat([value]);\n          };\n\n          if (args.length === 0) return { matched: true };\n          if (args.length === 1) {\n            throw new Error(\n              `\\`P.map\\` wasn\\'t given enough arguments. Expected (key, value), received ${args[0]?.toString()}`\n            );\n          }\n          const [patternKey, patternValue] = args;\n\n          const matched = mapEvery(value, (v, k) => {\n            const keyMatch = matchPattern(patternKey, k, selector);\n            const valueMatch = matchPattern(patternValue, v, selector);\n            return keyMatch && valueMatch;\n          });\n\n          return { matched, selections };\n        },\n        getSelectionKeys: () =>\n          args.length === 0\n            ? []\n            : [...getSelectionKeys(args[0]), ...getSelectionKeys(args[1])],\n      };\n    },\n  });\n}\n\nconst mapEvery = <K, T>(\n  map: Map<K, T>,\n  predicate: (value: T, key: K) => boolean\n) => {\n  for (const [key, value] of map.entries()) {\n    if (predicate(value, key)) continue;\n    return false;\n  }\n  return true;\n};\n\n/**\n * `P.intersection(...patterns)` returns a pattern which matches\n * only if **every** patterns provided in parameter match the input.\n *\n * [Read the documentation for `P.intersection` on GitHub](https://github.com/gvergnaud/ts-pattern#pintersection-patterns)\n *\n * @example\n *  match(value)\n *   .with(\n *     {\n *       user: P.intersection(\n *         { firstname: P.string },\n *         { lastname: P.string },\n *         { age: P.when(age => age > 21) }\n *       )\n *     },\n *     ({ user }) => 'will match { firstname: string, lastname: string, age: number } if age > 21'\n *   )\n */\nexport function intersection<\n  input,\n  const patterns extends readonly [Pattern<input>, ...Pattern<input>[]]\n>(...patterns: patterns): Chainable<AndP<input, patterns>> {\n  return chainable({\n    [matcher]: () => ({\n      match: (value) => {\n        let selections: Record<string, unknown[]> = {};\n        const selector = (key: string, value: any) => {\n          selections[key] = value;\n        };\n        const matched = (patterns as readonly UnknownPattern[]).every((p) =>\n          matchPattern(p, value, selector)\n        );\n        return { matched, selections };\n      },\n      getSelectionKeys: () =>\n        flatMap(patterns as readonly UnknownPattern[], getSelectionKeys),\n      matcherType: 'and',\n    }),\n  });\n}\n\n/**\n * `P.union(...patterns)` returns a pattern which matches\n * if **at least one** of the patterns provided in parameter match the input.\n *\n * [Read the documentation for `P.union` on GitHub](https://github.com/gvergnaud/ts-pattern#punion-patterns)\n *\n * @example\n *  match(value)\n *   .with(\n *     { type: P.union('a', 'b', 'c') },\n *     ({ type }) => 'will match { type: \"a\" | \"b\" | \"c\" }'\n *   )\n */\nexport function union<\n  input,\n  const patterns extends readonly [Pattern<input>, ...Pattern<input>[]]\n>(...patterns: patterns): Chainable<OrP<input, patterns>> {\n  return chainable({\n    [matcher]: () => ({\n      match: <UnknownInput>(value: UnknownInput | input) => {\n        let selections: Record<string, unknown[]> = {};\n        const selector = (key: string, value: any) => {\n          selections[key] = value;\n        };\n        flatMap(\n          patterns as readonly UnknownPattern[],\n          getSelectionKeys\n        ).forEach((key) => selector(key, undefined));\n        const matched = (patterns as readonly UnknownPattern[]).some((p) =>\n          matchPattern(p, value, selector)\n        );\n        return { matched, selections };\n      },\n      getSelectionKeys: () =>\n        flatMap(patterns as readonly UnknownPattern[], getSelectionKeys),\n      matcherType: 'or',\n    }),\n  });\n}\n\n/**\n * `P.not(pattern)` returns a pattern which matches if the sub pattern\n * doesn't match.\n *\n * [Read the documentation for `P.not` on GitHub](https://github.com/gvergnaud/ts-pattern#pnot-patterns)\n *\n * @example\n *  match<{ a: string | number }>(value)\n *   .with({ a: P.not(P.string) }, (x) => 'will match { a: number }'\n *   )\n */\n\nexport function not<\n  input,\n  const pattern extends Pattern<input> | UnknownPattern\n>(pattern: pattern): Chainable<NotP<input, pattern>> {\n  return chainable({\n    [matcher]: () => ({\n      match: <UnknownInput>(value: UnknownInput | input) => ({\n        matched: !matchPattern(pattern, value, () => {}),\n      }),\n      getSelectionKeys: () => [],\n      matcherType: 'not',\n    }),\n  });\n}\n\n/**\n * `P.when((value) => boolean)` returns a pattern which matches\n * if the predicate returns true for the current input.\n *\n * [Read the documentation for `P.when` on GitHub](https://github.com/gvergnaud/ts-pattern#pwhen-patterns)\n *\n * @example\n *  match<{ age: number }>(value)\n *   .with({ age: P.when(age => age > 21) }, (x) => 'will match if value.age > 21'\n *   )\n */\nexport function when<input, predicate extends (value: input) => unknown>(\n  predicate: predicate\n): GuardP<\n  input,\n  predicate extends (value: any) => value is infer narrowed ? narrowed : never\n>;\nexport function when<input, narrowed extends input, excluded>(\n  predicate: (input: input) => input is narrowed\n): GuardExcludeP<input, narrowed, excluded>;\nexport function when<input, predicate extends (value: input) => unknown>(\n  predicate: predicate\n): GuardP<\n  input,\n  predicate extends (value: any) => value is infer narrowed ? narrowed : never\n> {\n  return {\n    [matcher]: () => ({\n      match: <UnknownInput>(value: UnknownInput | input) => ({\n        matched: Boolean(predicate(value as input)),\n      }),\n    }),\n  };\n}\n\n/**\n * `P.select()` is a pattern which will always match,\n * and will inject the selected piece of input in the handler function.\n *\n * [Read the documentation for `P.select` on GitHub](https://github.com/gvergnaud/ts-pattern#pselect-patterns)\n *\n * @example\n *  match<{ age: number }>(value)\n *   .with({ age: P.select() }, (age) => 'age: number'\n *   )\n */\nexport function select(): Chainable<AnonymousSelectP, 'select' | 'or' | 'and'>;\nexport function select<\n  input,\n  const patternOrKey extends\n    | string\n    | (unknown extends input ? UnknownPattern : Pattern<input>)\n>(\n  patternOrKey: patternOrKey\n): patternOrKey extends string\n  ? Chainable<SelectP<patternOrKey, 'select' | 'or' | 'and'>>\n  : Chainable<\n      SelectP<symbols.anonymousSelectKey, input, patternOrKey>,\n      'select' | 'or' | 'and'\n    >;\nexport function select<\n  input,\n  const pattern extends unknown extends input ? UnknownPattern : Pattern<input>,\n  const k extends string\n>(\n  key: k,\n  pattern: pattern\n): Chainable<SelectP<k, input, pattern>, 'select' | 'or' | 'and'>;\nexport function select(\n  ...args: [keyOrPattern?: unknown | string, pattern?: unknown]\n): Chainable<SelectP<string>, 'select' | 'or' | 'and'> {\n  const key: string | undefined =\n    typeof args[0] === 'string' ? args[0] : undefined;\n  const pattern: unknown =\n    args.length === 2\n      ? args[1]\n      : typeof args[0] === 'string'\n      ? undefined\n      : args[0];\n  return chainable({\n    [matcher]() {\n      return {\n        match: (value) => {\n          let selections: Record<string, unknown> = {\n            [key ?? symbols.anonymousSelectKey]: value,\n          };\n          const selector = (key: string, value: any) => {\n            selections[key] = value;\n          };\n          return {\n            matched:\n              pattern === undefined\n                ? true\n                : matchPattern(pattern, value, selector),\n            selections: selections,\n          };\n        },\n        getSelectionKeys: () =>\n          [key ?? symbols.anonymousSelectKey].concat(\n            pattern === undefined ? [] : getSelectionKeys(pattern)\n          ),\n      };\n    },\n  });\n}\n\nfunction isUnknown(x: unknown): x is unknown {\n  return true;\n}\n\nfunction isNumber<T>(x: T | number): x is number {\n  return typeof x === 'number';\n}\n\nfunction isString<T>(x: T | string): x is string {\n  return typeof x === 'string';\n}\n\nfunction isBoolean<T>(x: T | boolean): x is boolean {\n  return typeof x === 'boolean';\n}\n\nfunction isBigInt<T>(x: T | bigint): x is bigint {\n  return typeof x === 'bigint';\n}\n\nfunction isSymbol<T>(x: T | symbol): x is symbol {\n  return typeof x === 'symbol';\n}\n\nfunction isNullish<T>(x: T | null | undefined): x is null | undefined {\n  return x === null || x === undefined;\n}\n\nfunction isNonNullable(x: unknown): x is {} {\n  return x !== null && x !== undefined;\n}\n\ntype AnyConstructor = abstract new (...args: any[]) => any;\n\nfunction isInstanceOf<T extends AnyConstructor>(classConstructor: T) {\n  return (val: unknown): val is InstanceType<T> =>\n    val instanceof classConstructor;\n}\n\n/**\n * `P.any` is a wildcard pattern, matching **any value**.\n *\n * [Read the documentation for `P.any` on GitHub](https://github.com/gvergnaud/ts-pattern#p_-wildcard)\n *\n * @example\n *  match(value)\n *   .with(P.any, () => 'will always match')\n */\nexport const any: AnyPattern = chainable(when(isUnknown));\n\n/**\n * `P._` is a wildcard pattern, matching **any value**.\n * It's an alias to `P.any`.\n *\n * [Read the documentation for `P._` on GitHub](https://github.com/gvergnaud/ts-pattern#p_-wildcard)\n *\n * @example\n *  match(value)\n *   .with(P._, () => 'will always match')\n */\nexport const _ = any;\n\n/**\n * `P.string.startsWith(start)` is a pattern, matching **strings** starting with `start`.\n *\n * [Read the documentation for `P.string.startsWith` on GitHub](https://github.com/gvergnaud/ts-pattern#pstringstartsWith)\n *\n * @example\n *  match(value)\n *   .with(P.string.startsWith('A'), () => 'value starts with an A')\n */\n\nconst startsWith = <input, const start extends string>(\n  start: start\n): GuardP<input, `${start}${string}`> =>\n  when((value) => isString(value) && value.startsWith(start));\n\n/**\n * `P.string.endsWith(end)` is a pattern, matching **strings** ending with `end`.\n *\n * [Read the documentation for `P.string.endsWith` on GitHub](https://github.com/gvergnaud/ts-pattern#pstringendsWith)\n *\n * @example\n *  match(value)\n *   .with(P.string.endsWith('!'), () => 'value ends with an !')\n */\nconst endsWith = <input, const end extends string>(\n  end: end\n): GuardP<input, `${string}${end}`> =>\n  when((value) => isString(value) && value.endsWith(end));\n\n/**\n * `P.string.minLength(min)` is a pattern, matching **strings** with at least `min` characters.\n *\n * [Read the documentation for `P.string.minLength` on GitHub](https://github.com/gvergnaud/ts-pattern#pstringminLength)\n *\n * @example\n *  match(value)\n *   .with(P.string.minLength(10), () => 'string with more length >= 10')\n */\nconst minLength = <const min extends number>(min: min) =>\n  when((value) => isString(value) && value.length >= min);\n\n/**\n * `P.string.length(len)` is a pattern, matching **strings** with exactly `len` characters.\n *\n * [Read the documentation for `P.string.length` on GitHub](https://github.com/gvergnaud/ts-pattern#pstringlength)\n *\n * @example\n *  match(value)\n *   .with(P.string.length(10), () => 'strings with length === 10')\n */\nconst length = <const len extends number>(len: len) =>\n  when((value) => isString(value) && value.length === len);\n\n/**\n * `P.string.maxLength(max)` is a pattern, matching **strings** with at most `max` characters.\n *\n * [Read the documentation for `P.string.maxLength` on GitHub](https://github.com/gvergnaud/ts-pattern#pstringmaxLength)\n *\n * @example\n *  match(value)\n *   .with(P.string.maxLength(10), () => 'string with more length <= 10')\n */\nconst maxLength = <const max extends number>(max: max) =>\n  when((value) => isString(value) && value.length <= max);\n\n/**\n * `P.string.includes(substr)` is a pattern, matching **strings** containing `substr`.\n *\n * [Read the documentation for `P.string.includes` on GitHub](https://github.com/gvergnaud/ts-pattern#pstringincludes)\n *\n * @example\n *  match(value)\n *   .with(P.string.includes('http'), () => 'value contains http')\n */\nconst includes = <input, const substr extends string>(\n  substr: substr\n): GuardExcludeP<input, string, never> =>\n  when((value) => isString(value) && value.includes(substr));\n\n/**\n * `P.string.regex(expr)` is a pattern, matching **strings** that `expr` regular expression.\n *\n * [Read the documentation for `P.string.regex` on GitHub](https://github.com/gvergnaud/ts-pattern#pstringregex)\n *\n * @example\n *  match(value)\n *   .with(P.string.regex(/^https?:\\/\\//), () => 'url')\n */\nconst regex = <input, const expr extends string | RegExp>(\n  expr: expr\n): GuardExcludeP<input, string, never> =>\n  when((value) => isString(value) && Boolean(value.match(expr)));\n\nconst stringChainable = <pattern extends Matcher<any, any, any, any, any>>(\n  pattern: pattern\n): StringChainable<pattern> =>\n  Object.assign(chainable(pattern), {\n    startsWith: (str: string) =>\n      stringChainable(intersection(pattern, startsWith(str))),\n    endsWith: (str: string) =>\n      stringChainable(intersection(pattern, endsWith(str))),\n    minLength: (min: number) =>\n      stringChainable(intersection(pattern, minLength(min))),\n    length: (len: number) =>\n      stringChainable(intersection(pattern, length(len))),\n    maxLength: (max: number) =>\n      stringChainable(intersection(pattern, maxLength(max))),\n    includes: (str: string) =>\n      stringChainable(intersection(pattern, includes(str))),\n    regex: (str: string) => stringChainable(intersection(pattern, regex(str))),\n  }) as any;\n\n/**\n * `P.string` is a wildcard pattern, matching any **string**.\n *\n * [Read the documentation for `P.string` on GitHub](https://github.com/gvergnaud/ts-pattern#pstring-wildcard)\n *\n * @example\n *  match(value)\n *   .with(P.string, () => 'will match on strings')\n */\nexport const string: StringPattern = stringChainable(when(isString));\n\n/**\n * `P.number.between(min, max)` matches **numbers** between `min` and `max`,\n * equal to min or equal to max.\n *\n * [Read the documentation for `P.number.between` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumberbetween)\n *\n * @example\n *  match(value)\n *   .with(P.number.between(0, 10), () => '0 <= numbers <= 10')\n */\nconst between = <input, const min extends number, const max extends number>(\n  min: min,\n  max: max\n): GuardExcludeP<input, number, never> =>\n  when((value) => isNumber(value) && min <= value && max >= value);\n\n/**\n * `P.number.lt(max)` matches **numbers** smaller than `max`.\n *\n * [Read the documentation for `P.number.lt` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumberlt)\n *\n * @example\n *  match(value)\n *   .with(P.number.lt(10), () => 'numbers < 10')\n */\nconst lt = <input, const max extends number>(\n  max: max\n): GuardExcludeP<input, number, never> =>\n  when((value) => isNumber(value) && value < max);\n\n/**\n * `P.number.gt(min)` matches **numbers** greater than `min`.\n *\n * [Read the documentation for `P.number.gt` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumbergt)\n *\n * @example\n *  match(value)\n *   .with(P.number.gt(10), () => 'numbers > 10')\n */\nconst gt = <input, const min extends number>(\n  min: min\n): GuardExcludeP<input, number, never> =>\n  when((value) => isNumber(value) && value > min);\n\n/**\n * `P.number.lte(max)` matches **numbers** smaller than or equal to `max`.\n *\n * [Read the documentation for `P.number.lte` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumberlte)\n *\n * @example\n *  match(value)\n *   .with(P.number.lte(10), () => 'numbers <= 10')\n */\nconst lte = <input, const max extends number>(\n  max: max\n): GuardExcludeP<input, number, never> =>\n  when((value) => isNumber(value) && value <= max);\n\n/**\n * `P.number.gte(min)` matches **numbers** greater than or equal to `min`.\n *\n * [Read the documentation for `P.number.gte` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumbergte)\n *\n * @example\n *  match(value)\n *   .with(P.number.gte(10), () => 'numbers >= 10')\n */\nconst gte = <input, const min extends number>(\n  min: min\n): GuardExcludeP<input, number, never> =>\n  when((value) => isNumber(value) && value >= min);\n\n/**\n * `P.number.int()` matches **integer** numbers.\n *\n * [Read the documentation for `P.number.int()` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumberint)\n *\n * @example\n *  match(value)\n *   .with(P.number.int(), () => 'an integer')\n */\nconst int = <input>(): GuardExcludeP<input, number, never> =>\n  when((value) => isNumber(value) && Number.isInteger(value));\n\n/**\n * `P.number.finite` matches **finite numbers**.\n *\n * [Read the documentation for `P.number.finite` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumberfinite)\n *\n * @example\n *  match(value)\n *   .with(P.number.finite, () => 'not Infinity')\n */\nconst finite = <input>(): GuardExcludeP<input, number, never> =>\n  when((value) => isNumber(value) && Number.isFinite(value));\n\n/**\n * `P.number.positive()` matches **positive** numbers.\n *\n * [Read the documentation for `P.number.positive()` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumberpositive)\n *\n * @example\n *  match(value)\n *   .with(P.number.positive(), () => 'number > 0')\n */\nconst positive = <input>(): GuardExcludeP<input, number, never> =>\n  when((value) => isNumber(value) && value > 0);\n\n/**\n * `P.number.negative()` matches **negative** numbers.\n *\n * [Read the documentation for `P.number.negative()` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumbernegative)\n *\n * @example\n *  match(value)\n *   .with(P.number.negative(), () => 'number < 0')\n */\nconst negative = <input>(): GuardExcludeP<input, number, never> =>\n  when((value) => isNumber(value) && value < 0);\n\nconst numberChainable = <pattern extends Matcher<any, any, any, any, any>>(\n  pattern: pattern\n): NumberChainable<pattern> =>\n  Object.assign(chainable(pattern), {\n    between: (min: number, max: number) =>\n      numberChainable(intersection(pattern, between(min, max))),\n    lt: (max: number) => numberChainable(intersection(pattern, lt(max))),\n    gt: (min: number) => numberChainable(intersection(pattern, gt(min))),\n    lte: (max: number) => numberChainable(intersection(pattern, lte(max))),\n    gte: (min: number) => numberChainable(intersection(pattern, gte(min))),\n    int: () => numberChainable(intersection(pattern, int())),\n    finite: () => numberChainable(intersection(pattern, finite())),\n    positive: () => numberChainable(intersection(pattern, positive())),\n    negative: () => numberChainable(intersection(pattern, negative())),\n  }) as any;\n\n/**\n * `P.number` is a wildcard pattern, matching any **number**.\n *\n * [Read the documentation for `P.number` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumber-wildcard)\n *\n * @example\n *  match(value)\n *   .with(P.number, () => 'will match on numbers')\n */\nexport const number: NumberPattern = numberChainable(when(isNumber));\n\n/**\n * `P.bigint.between(min, max)` matches **bigint** between `min` and `max`,\n * equal to min or equal to max.\n *\n * [Read the documentation for `P.bigint.between` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumberbetween)\n *\n * @example\n *  match(value)\n *   .with(P.bigint.between(0, 10), () => '0 <= bigints <= 10')\n */\nconst betweenBigInt = <\n  input,\n  const min extends bigint,\n  const max extends bigint\n>(\n  min: min,\n  max: max\n): GuardExcludeP<input, bigint, never> =>\n  when((value) => isBigInt(value) && min <= value && max >= value);\n\n/**\n * `P.bigint.lt(max)` matches **bigint** smaller than `max`.\n *\n * [Read the documentation for `P.bigint.lt` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumberlt)\n *\n * @example\n *  match(value)\n *   .with(P.bigint.lt(10), () => 'bigints < 10')\n */\nconst ltBigInt = <input, const max extends bigint>(\n  max: max\n): GuardExcludeP<input, bigint, never> =>\n  when((value) => isBigInt(value) && value < max);\n\n/**\n * `P.bigint.gt(min)` matches **bigint** greater than `min`.\n *\n * [Read the documentation for `P.bigint.gt` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumbergt)\n *\n * @example\n *  match(value)\n *   .with(P.bigint.gt(10), () => 'bigints > 10')\n */\nconst gtBigInt = <input, const min extends bigint>(\n  min: min\n): GuardExcludeP<input, bigint, never> =>\n  when((value) => isBigInt(value) && value > min);\n\n/**\n * `P.bigint.lte(max)` matches **bigint** smaller than or equal to `max`.\n *\n * [Read the documentation for `P.bigint.lte` on GitHub](https://github.com/gvergnaud/ts-pattern#pnumberlte)\n *\n * @example\n *  match(value)\n *   .with(P.bigint.lte(10), () => 'bigints <= 10')\n */\nconst lteBigInt = <input, const max extends bigint>(\n  max: max\n): GuardExcludeP<input, bigint, never> =>\n  when((value) => isBigInt(value) && value <= max);\n\n/**\n * `P.bigint.gte(min)` matches **bigint** greater than or equal to `min`.\n *\n * [Read the documentation for `P.bigint.gte` on GitHub](https://github.com/gvergnaud/ts-pattern#pbigintgte)\n *\n * @example\n *  match(value)\n *   .with(P.bigint.gte(10), () => 'bigints >= 10')\n */\nconst gteBigInt = <input, const min extends bigint>(\n  min: min\n): GuardExcludeP<input, bigint, never> =>\n  when((value) => isBigInt(value) && value >= min);\n\n/**\n * `P.bigint.positive()` matches **positive** bigints.\n *\n * [Read the documentation for `P.bigint.positive()` on GitHub](https://github.com/gvergnaud/ts-pattern#pbigintpositive)\n *\n * @example\n *  match(value)\n *   .with(P.bigint.positive(), () => 'bigint > 0')\n */\nconst positiveBigInt = <input>(): GuardExcludeP<input, bigint, never> =>\n  when((value) => isBigInt(value) && value > 0);\n\n/**\n * `P.bigint.negative()` matches **negative** bigints.\n *\n * [Read the documentation for `P.bigint.negative()` on GitHub](https://github.com/gvergnaud/ts-pattern#pbigintnegative)\n *\n * @example\n *  match(value)\n *   .with(P.bigint.negative(), () => 'bigint < 0')\n */\nconst negativeBigInt = <input>(): GuardExcludeP<input, bigint, never> =>\n  when((value) => isBigInt(value) && value < 0);\n\nconst bigintChainable = <pattern extends Matcher<any, any, any, any, any>>(\n  pattern: pattern\n): BigIntChainable<pattern> =>\n  Object.assign(chainable(pattern), {\n    between: (min: bigint, max: bigint) =>\n      bigintChainable(intersection(pattern, betweenBigInt(min, max))),\n    lt: (max: bigint) => bigintChainable(intersection(pattern, ltBigInt(max))),\n    gt: (min: bigint) => bigintChainable(intersection(pattern, gtBigInt(min))),\n    lte: (max: bigint) =>\n      bigintChainable(intersection(pattern, lteBigInt(max))),\n    gte: (min: bigint) =>\n      bigintChainable(intersection(pattern, gteBigInt(min))),\n    positive: () => bigintChainable(intersection(pattern, positiveBigInt())),\n    negative: () => bigintChainable(intersection(pattern, negativeBigInt())),\n  }) as any;\n\n/**\n * `P.bigint` is a wildcard pattern, matching any **bigint**.\n *\n * [Read the documentation for `P.bigint` on GitHub](https://github.com/gvergnaud/ts-pattern#number-wildcard)\n *\n * @example\n *   .with(P.bigint, () => 'will match on bigints')\n */\nexport const bigint: BigIntPattern = bigintChainable(when(isBigInt));\n\n/**\n * `P.boolean` is a wildcard pattern, matching any **boolean**.\n *\n * [Read the documentation for `P.boolean` on GitHub](https://github.com/gvergnaud/ts-pattern#boolean-wildcard)\n *\n * @example\n *   .with(P.boolean, () => 'will match on booleans')\n */\nexport const boolean: BooleanPattern = chainable(when(isBoolean));\n\n/**\n * `P.symbol` is a wildcard pattern, matching any **symbol**.\n *\n * [Read the documentation for `P.symbol` on GitHub](https://github.com/gvergnaud/ts-pattern#symbol-wildcard)\n *\n * @example\n *   .with(P.symbol, () => 'will match on symbols')\n */\nexport const symbol: SymbolPattern = chainable(when(isSymbol));\n\n/**\n * `P.nullish` is a wildcard pattern, matching **null** or **undefined**.\n *\n * [Read the documentation for `P.nullish` on GitHub](https://github.com/gvergnaud/ts-pattern#nullish-wildcard)\n *\n * @example\n *   .with(P.nullish, (x) => `${x} is null or undefined`)\n */\nexport const nullish: NullishPattern = chainable(when(isNullish));\n\n/**\n * `P.nonNullable` is a wildcard pattern, matching everything except **null** or **undefined**.\n *\n * [Read the documentation for `P.nonNullable` on GitHub](https://github.com/gvergnaud/ts-pattern#nonNullable-wildcard)\n *\n * @example\n *   .with(P.nonNullable, (x) => `${x} isn't null nor undefined`)\n */\nexport const nonNullable: NonNullablePattern = chainable(when(isNonNullable));\n\n/**\n * `P.instanceOf(SomeClass)` is a pattern matching instances of a given class.\n *\n * [Read the documentation for `P.instanceOf` on GitHub](https://github.com/gvergnaud/ts-pattern#pinstanceof-patterns)\n *\n *  @example\n *   .with(P.instanceOf(SomeClass), () => 'will match on SomeClass instances')\n */\nexport function instanceOf<T extends AnyConstructor>(\n  classConstructor: T\n): Chainable<GuardP<unknown, InstanceType<T>>> {\n  return chainable(when(isInstanceOf(classConstructor)));\n}\n\n/**\n * `P.shape(somePattern)` lets you call methods like `.optional()`, `.and`, `.or` and `.select()`\n * On structural patterns, like objects and arrays.\n *\n * [Read the documentation for `P.shape` on GitHub](https://github.com/gvergnaud/ts-pattern#pshape-patterns)\n *\n *  @example\n *   .with(\n *     {\n *       state: P.shape({ status: \"success\" }).optional().select()\n *     },\n *     (state) => 'match the success state, or undefined.'\n *   )\n */\nexport function shape<input, const pattern extends Pattern<input>>(\n  pattern: pattern\n): Chainable<GuardP<input, InvertPattern<pattern, input>>>;\nexport function shape(pattern: UnknownPattern) {\n  return chainable(when(isMatching(pattern)));\n}\n","/**\n * Error when the given input value does not match any included pattern\n * and .exhaustive() was specified\n */\nexport class NonExhaustiveError extends Error {\n  constructor(public input: unknown) {\n    let displayedValue;\n    try {\n      displayedValue = JSON.stringify(input);\n    } catch (e) {\n      displayedValue = input;\n    }\n    super(`Pattern matching error: no pattern matches value ${displayedValue}`);\n  }\n}\n","import { Pattern } from './types/Pattern';\nimport { Match } from './types/Match';\nimport * as symbols from './internals/symbols';\nimport { matchPattern } from './internals/helpers';\nimport { NonExhaustiveError } from './errors';\n\ntype MatchState<output> =\n  | { matched: true; value: output }\n  | { matched: false; value: undefined };\n\nconst unmatched: MatchState<never> = {\n  matched: false,\n  value: undefined,\n};\n\n/**\n * `match` creates a **pattern matching expression**.\n *  * Use `.with(pattern, handler)` to pattern match on the input.\n *  * Use `.exhaustive()` or `.otherwise(() => defaultValue)` to end the expression and get the result.\n *\n * [Read the documentation for `match` on GitHub](https://github.com/gvergnaud/ts-pattern#match)\n *\n * @example\n *  declare let input: \"A\" | \"B\";\n *\n *  return match(input)\n *    .with(\"A\", () => \"It's an A!\")\n *    .with(\"B\", () => \"It's a B!\")\n *    .exhaustive();\n *\n */\nexport function match<const input, output = symbols.unset>(\n  value: input\n): Match<input, output> {\n  return new MatchExpression(value, unmatched) as any;\n}\n\n/**\n * This class represents a match expression. It follows the\n * builder pattern, we chain methods to add features to the expression\n * until we call `.exhaustive`, `.otherwise` or the unsafe `.run`\n * method to execute it.\n *\n * The types of this class aren't public, the public type definition\n * can be found in src/types/Match.ts.\n */\nclass MatchExpression<input, output> {\n  constructor(private input: input, private state: MatchState<output>) {}\n\n  with(...args: any[]): MatchExpression<input, output> {\n    if (this.state.matched) return this;\n\n    const handler: (selection: unknown, value: input) => output =\n      args[args.length - 1];\n\n    const patterns: Pattern<input>[] = [args[0]];\n    let predicate: ((value: input) => unknown) | undefined = undefined;\n\n    if (args.length === 3 && typeof args[1] === 'function') {\n      // case with guard as second argument\n      predicate = args[1];\n    } else if (args.length > 2) {\n      // case with several patterns\n      patterns.push(...args.slice(1, args.length - 1));\n    }\n\n    let hasSelections = false;\n    let selected: Record<string, unknown> = {};\n    const select = (key: string, value: unknown) => {\n      hasSelections = true;\n      selected[key] = value;\n    };\n\n    const matched =\n      patterns.some((pattern) => matchPattern(pattern, this.input, select)) &&\n      (predicate ? Boolean(predicate(this.input)) : true);\n\n    const selections = hasSelections\n      ? symbols.anonymousSelectKey in selected\n        ? selected[symbols.anonymousSelectKey]\n        : selected\n      : this.input;\n\n    const state = matched\n      ? {\n          matched: true as const,\n          value: handler(selections, this.input),\n        }\n      : unmatched;\n\n    return new MatchExpression(this.input, state);\n  }\n\n  when(\n    predicate: (value: input) => unknown,\n    handler: (selection: input, value: input) => output\n  ): MatchExpression<input, output> {\n    if (this.state.matched) return this;\n\n    const matched = Boolean(predicate(this.input));\n\n    return new MatchExpression<input, output>(\n      this.input,\n      matched\n        ? { matched: true, value: handler(this.input, this.input) }\n        : unmatched\n    );\n  }\n\n  otherwise(handler: (value: input) => output): output {\n    if (this.state.matched) return this.state.value;\n    return handler(this.input);\n  }\n\n  exhaustive(unexpectedValueHandler = defaultCatcher): output {\n    if (this.state.matched) return this.state.value;\n    return unexpectedValueHandler(this.input);\n  }\n\n  run(): output {\n    return this.exhaustive();\n  }\n\n  returnType() {\n    return this;\n  }\n}\n\nfunction defaultCatcher(input: unknown): never {\n  throw new NonExhaustiveError(input);\n}\n"],"names":["matcher","Symbol","isVariadic","anonymousSelectKey","isObject","value","Boolean","isMatcher","x","symbols","matchPattern","pattern","select","_matcher$match","match","matched","selections","Object","keys","forEach","key","Array","isArray","_step","startPatterns","endPatterns","variadicPatterns","_iterator","_createForOfIteratorHelperLoose","done","subpatte