it('returns string handles', () => {
			const source = new NormalSource()
			const sourceId = registry.addSource(Types.FOO, source)
			const targetA = new NormalTarget()
			const targetAId = registry.addTarget(Types.FOO, targetA)
			const targetB = new NormalTarget()
			const targetBId = registry.addTarget([Types.FOO, Types.BAR], targetB)

			expect(isString(sourceId)).toEqual(true)
			expect(isString(targetAId)).toEqual(true)
			expect(isString(targetBId)).toEqual(true)
		})

export function guessFieldTypeFromValue(v: any): FieldType {
  if (isNumber(v)) {
    return FieldType.number;
  }

  if (isString(v)) {
    if (NUMBER.test(v)) {
      return FieldType.number;
    }

    if (v === 'true' || v === 'TRUE' || v === 'True' || v === 'false' || v === 'FALSE' || v === 'False') {
      return FieldType.boolean;
    }

    return FieldType.string;
  }

  if (isBoolean(v)) {
    return FieldType.boolean;
  }

  if (v instanceof Date || isDateTime(v)) {
    return FieldType.time;
  }

  return FieldType.other;
}

 toFindQueryResult(x) {
   return isString(x) ? { text: x, expandable: true } : { ...x, expandable: true };
 }

 mode: (mode) => isString(mode) && allowedModes.includes(mode),

const checkKey = (key) => invariant(
  isString(key) && !isEmpty(key),
  '(app/utils...) injectSaga: Expected `key` to be a non empty string'
);