Typings are incompatible with jest

[mdnorman]

Because truffle-typings includes chai and mocha constants, the same project can't use jest for tests.

Build errors:

node_modules/@types/jest/index.d.ts:33:13 - error TS2403: Subsequent variable declarations must have the same type.  Variable 'beforeEach' must be of type 'HookFunction', but here has type 'Lifecycle'.

33 declare var beforeEach: jest.Lifecycle;
               ~~~~~~~~~~

  node_modules/@types/mocha/index.d.ts:2680:13
    2680 declare var beforeEach: Mocha.HookFunction;
                     ~~~~~~~~~~
    'beforeEach' was also declared here.

node_modules/@types/jest/index.d.ts:35:13 - error TS2403: Subsequent variable declarations must have the same type.  Variable 'afterEach' must be of type 'HookFunction', but here has type 'Lifecycle'.

35 declare var afterEach: jest.Lifecycle;
               ~~~~~~~~~

  node_modules/@types/mocha/index.d.ts:2698:13
    2698 declare var afterEach: Mocha.HookFunction;
                     ~~~~~~~~~
    'afterEach' was also declared here.

node_modules/@types/jest/index.d.ts:36:13 - error TS2403: Subsequent variable declarations must have the same type.  Variable 'describe' must be of type 'SuiteFunction', but here has type 'Describe'.

36 declare var describe: jest.Describe;
               ~~~~~~~~

  node_modules/@types/mocha/index.d.ts:2714:13
    2714 declare var describe: Mocha.SuiteFunction;
                     ~~~~~~~~
    'describe' was also declared here.

node_modules/@types/jest/index.d.ts:38:13 - error TS2403: Subsequent variable declarations must have the same type.  Variable 'xdescribe' must be of type 'PendingSuiteFunction', but here has type 'Describe'.

38 declare var xdescribe: jest.Describe;
               ~~~~~~~~~

  node_modules/@types/mocha/index.d.ts:2735:13
    2735 declare var xdescribe: Mocha.PendingSuiteFunction;
                     ~~~~~~~~~
    'xdescribe' was also declared here.

node_modules/@types/jest/index.d.ts:39:13 - error TS2403: Subsequent variable declarations must have the same type.  Variable 'it' must be of type 'TestFunction', but here has type 'It'.

39 declare var it: jest.It;
               ~~

  node_modules/@types/mocha/index.d.ts:2749:13
    2749 declare var it: Mocha.TestFunction;
                     ~~
    'it' was also declared here.

node_modules/@types/jest/index.d.ts:41:13 - error TS2403: Subsequent variable declarations must have the same type.  Variable 'xit' must be of type 'PendingTestFunction', but here has type 'It'.

41 declare var xit: jest.It;
               ~~~

  node_modules/@types/mocha/index.d.ts:2770:13
    2770 declare var xit: Mocha.PendingTestFunction;
                     ~~~
    'xit' was also declared here.

node_modules/@types/jest/index.d.ts:42:13 - error TS2403: Subsequent variable declarations must have the same type.  Variable 'test' must be of type 'TestFunction', but here has type 'It'.

42 declare var test: jest.It;
               ~~~~

  node_modules/@types/mocha/index.d.ts:2763:13
    2763 declare var test: Mocha.TestFunction;
                     ~~~~
    'test' was also declared here.

node_modules/@types/jest/index.d.ts:45:15 - error TS2451: Cannot redeclare block-scoped variable 'expect'.

45 declare const expect: jest.Expect;
                 ~~~~~~

  node_modules/truffle-typings/index.d.ts:11:15
    11 declare const expect: Chai.ExpectStatic;
                     ~~~~~~
    'expect' was also declared here.

node_modules/truffle-typings/index.d.ts:11:15 - error TS2451: Cannot redeclare block-scoped variable 'expect'.

11 declare const expect: Chai.ExpectStatic;
                 ~~~~~~

  node_modules/@types/jest/index.d.ts:45:15
    45 declare const expect: jest.Expect;
                     ~~~~~~
    'expect' was also declared here.

[guruprasath605]

is it done..