Function typecheckCheck

test/components/connect.spec.js:1937–1966

(name, expectedTypes, typeException = null)

      }

      function typecheckCheck(name, expectedTypes, typeException = null) {
        expectedTypes = Array.isArray(expectedTypes) ? expectedTypes : [ expectedTypes ]
        typeException = typeException || function (type) {
          return regexpify(
            `${name} must be ${expectedTypes.length > 1 ? 'one of' : 'a'} ${expectedTypes}. Instead received a ${type}.`
          )
        }

        const checks = {
          boolean: [ true, false ],
          function: [ Date, () => {} ],
          number: [ 1337, 1.37e25, 0.123456789, Math.PI, -42, 0, NaN, Infinity ],
          object: [ null, [ 7.2, 'billion' ], new Date(), { obj: 'ect' } ],
          string: [ 'string', 'chaîne', '細線', '😀🌂🔗💯🆗' ],
          symbol: [ Symbol('hearts'), Symbol(), Symbol.iterator ],
          undefined: [ undefined, void 0 ]
        }

        for (let type in checks) {
          let values = checks[type]
          if (expectedTypes.some(t => t === type)) { return }
          if (expectedTypes.some(t => t === 'plain object with string values') &&
            type === 'object') { values = values.slice(0, 3) }

          values.forEach(value => {
            expect(() => connect.defaults({ [name]: value })())
              .toThrow(typeException(type, value))
          })
        }
      }

      it('should throw unless a function is given as buildRequest', () => {
        typecheckCheck('buildRequest', 'function')