chore: remove unneeded conditions (#594)

These are not needed with `@typescript-eslint@3`

Author: G-Rath

src/rules/no-test-callback.ts

@@ -63,13 +63,6 @@ export default createRule({
               fix(fixer) {
                 const { body } = callback;
 
-                /* istanbul ignore if https://github.com/typescript-eslint/typescript-eslint/issues/734 */
-                if (!body) {
-                  throw new Error(
-                    `Unexpected null when attempting to fix ${context.getFilename()} - please file a github issue at https://github.com/jest-community/eslint-plugin-jest`,
-                  );
-                }
-
                 const sourceCode = context.getSourceCode();
                 const firstBodyToken = sourceCode.getFirstToken(body);
                 const lastBodyToken = sourceCode.getLastToken(body);

src/rules/no-test-return-statement.ts

@@ -15,7 +15,6 @@ const getBody = (args: TSESTree.Expression[]) => {
   if (
     secondArg &&
     isFunction(secondArg) &&
-    secondArg.body &&
     secondArg.body.type === AST_NODE_TYPES.BlockStatement
   ) {
     return secondArg.body.body;

src/rules/prefer-todo.ts

@@ -19,17 +19,8 @@ function isEmptyFunction(node: TSESTree.Expression) {
     return false;
   }
 
-  /* istanbul ignore if https://github.com/typescript-eslint/typescript-eslint/issues/734 */
-  if (!node.body) {
-    throw new Error(
-      `Unexpected null while performing prefer-todo - please file a github issue at https://github.com/jest-community/eslint-plugin-jest`,
-    );
-  }
-
   return (
-    node.body.type === AST_NODE_TYPES.BlockStatement &&
-    node.body.body &&
-    !node.body.body.length
+    node.body.type === AST_NODE_TYPES.BlockStatement && !node.body.body.length
   );
 }
 

src/rules/valid-describe.ts

@@ -92,10 +92,7 @@ export default createRule({
           });
         }
 
-        if (
-          callback.body &&
-          callback.body.type === AST_NODE_TYPES.BlockStatement
-        ) {
+        if (callback.body.type === AST_NODE_TYPES.BlockStatement) {
           callback.body.body.forEach(node => {
             if (node.type === AST_NODE_TYPES.ReturnStatement) {
               context.report({

src/rules/valid-expect-in-promise.ts

@@ -132,14 +132,9 @@ const verifyExpectWithReturn = (
   testFunctionBody: TSESTree.Statement[],
 ) => {
   promiseCallbacks.some(promiseCallback => {
-    if (
-      promiseCallback &&
-      isFunction(promiseCallback) &&
-      promiseCallback.body
-    ) {
+    if (promiseCallback && isFunction(promiseCallback)) {
       if (
         isExpectCallPresentInFunction(promiseCallback.body) &&
-        node.parent &&
         node.parent.parent &&
         !isParentThenOrPromiseReturned(node.parent.parent, testFunctionBody)
       ) {
@@ -187,13 +182,6 @@ export default createRule<unknown[], MessageIds>({
         if (testFunction && !isHavingAsyncCallBackParam(testFunction)) {
           const { body } = testFunction;
 
-          /* istanbul ignore if https://github.com/typescript-eslint/typescript-eslint/issues/734 */
-          if (!body) {
-            throw new Error(
-              `Unexpected null when attempting to fix ${context.getFilename()} - please file a github issue at https://github.com/jest-community/eslint-plugin-jest`,
-            );
-          }
-
           if (body.type !== AST_NODE_TYPES.BlockStatement) {
             return;
           }