declare export var pipe: {
  <T, R>(f1: (request: T) => R): (source: T) => R,
  <T, T1, R>(f1: (request: T) => T1, f2: (request: T1) => R): (source: T) => R,
  <T, T1, T2, R>(
    f1: (request: T) => T1,
    f2: (request: T1) => T2,
    f3: (request: T2) => R
  ): (source: T) => R,
  <T, T1, T2, T3, R>(
    f1: (request: T) => T1,
    f2: (request: T1) => T2,
    f3: (request: T2) => T3,
    f4: (request: T3) => R
  ): (source: T) => R,
  <T, T1, T2, T3, T4, R>(
    f1: (request: T) => T1,
    f2: (request: T1) => T2,
    f3: (request: T2) => T3,
    f4: (request: T3) => T4,
    f5: (request: T4) => R
  ): (source: T) => R,
  <T, T1, T2, T3, T4, T5, R>(
    f1: (request: T) => T1,
    f2: (request: T1) => T2,
    f3: (request: T2) => T3,
    f4: (request: T3) => T4,
    f5: (request: T4) => T5,
    f6: (request: T5) => R
  ): (source: T) => R,
  ...
};