Add rule S4822 ('no-try-promise') for TS

eslint-bridge/src/rules/main.ts

@@ -42,6 +42,7 @@ import { rule as cyclomaticComplexity } from "./cyclomatic-complexity";
 import { rule as noAlphabeticalSort } from "./no-alphabetical-sort";
 import { rule as noTab } from "./no-tab";
 import { rule as noEmptyCollection } from "./no-empty-collection";
+import { rule as noTryPromise } from "./no-try-promise";
 import { rule as nonExistentOperator } from "./non-existent-operator";
 import { rule as noInMisuse } from "./no-in-misuse";
 import { rule as noInvariantReturns } from "./no-invariant-returns";
@@ -98,6 +99,7 @@ ruleModules["cyclomatic-complexity"] = cyclomaticComplexity;
 ruleModules["no-alphabetical-sort"] = noAlphabeticalSort;
 ruleModules["no-tab"] = noTab;
 ruleModules["no-empty-collection"] = noEmptyCollection;
+ruleModules["no-try-promise"] = noTryPromise;
 ruleModules["non-existent-operator"] = nonExistentOperator;
 ruleModules["no-in-misuse"] = noInMisuse;
 ruleModules["no-invariant-returns"] = noInvariantReturns;

eslint-bridge/src/rules/no-try-promise.ts

@@ -0,0 +1,206 @@
+/*
+ * SonarQube JavaScript Plugin
+ * Copyright (C) 2011-2019 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+// https://jira.sonarsource.com/browse/RSPEC-4822
+
+import { Rule, SourceCode } from "eslint";
+import * as estree from "estree";
+import {
+  isRequiredParserServices,
+  RequiredParserServices,
+} from "../utils/isRequiredParserServices";
+import { TSESTree } from "@typescript-eslint/experimental-utils";
+import { toEncodedMessage } from "./utils";
+
+type CallLikeExpression =
+  | TSESTree.CallExpression
+  | TSESTree.NewExpression
+  | TSESTree.AwaitExpression;
+
+export const rule: Rule.RuleModule = {
+  meta: {
+    schema: [
+      {
+        // internal parameter for rules having secondary locations
+        enum: ["sonar-runtime"],
+      },
+    ],
+  },
+  create(context: Rule.RuleContext) {
+    const services = context.parserServices;
+    if (isRequiredParserServices(services)) {
+      const ts = require("typescript");
+      return {
+        TryStatement: (node: estree.Node) => {
+          const tryStmt = node as TSESTree.TryStatement;
+          if (tryStmt.handler) {
+            // without '.catch()'
+            const openPromises: TSESTree.Node[] = [];
+            // with '.catch()'
+            const capturedPromises: TSESTree.Node[] = [];
+
+            let hasPotentiallyThrowingCalls = false;
+            CallLikeExpressionVisitor.getCallExpressions(tryStmt.block, context).forEach(
+              callLikeExpr => {
+                if (
+                  callLikeExpr.type === "AwaitExpression" ||
+                  !hasThenMethod(callLikeExpr, services, ts)
+                ) {
+                  hasPotentiallyThrowingCalls = true;
+                  return;
+                }
+
+                if (
+                  (callLikeExpr.parent && callLikeExpr.parent.type === "AwaitExpression") ||
+                  isThened(callLikeExpr) ||
+                  isCatch(callLikeExpr)
+                ) {
+                  return;
+                }
+
+                (isCaught(callLikeExpr) ? capturedPromises : openPromises).push(callLikeExpr);
+              },
+            );
+
+            if (!hasPotentiallyThrowingCalls) {
+              checkForWrongCatch(tryStmt, openPromises, context);
+              checkForUselessCatch(tryStmt, openPromises, capturedPromises, context);
+            }
+          }
+        },
+      };
+    }
+    return {};
+  },
+};
+
+class CallLikeExpressionVisitor {
+  private readonly callLikeExpressions: CallLikeExpression[] = [];
+
+  static getCallExpressions(node: TSESTree.Node, context: Rule.RuleContext) {
+    const visitor = new CallLikeExpressionVisitor();
+    visitor.visit(node, context);
+    return visitor.callLikeExpressions;
+  }
+
+  private visit(root: TSESTree.Node, context: Rule.RuleContext) {
+    const visitNode = (node: TSESTree.Node) => {
+      switch (node.type) {
+        case "AwaitExpression":
+        case "CallExpression":
+        case "NewExpression":
+          this.callLikeExpressions.push(node);
+          break;
+        case "FunctionDeclaration":
+        case "FunctionExpression":
+        case "ArrowFunctionExpression":
+          return;
+      }
+      childrenOf(node, context.getSourceCode().visitorKeys).forEach(visitNode);
+    };
+    visitNode(root);
+  }
+}
+
+function checkForWrongCatch(
+  tryStmt: TSESTree.TryStatement,
+  openPromises: TSESTree.Node[],
+  context: Rule.RuleContext,
+) {
+  if (openPromises.length > 0) {
+    const ending = openPromises.length > 1 ? "s" : "";
+    const message = `Consider using 'await' for the promise${ending} inside this 'try' or replace it with 'Promise.prototype.catch(...)' usage${ending}.`;
+    const token = context.getSourceCode().getFirstToken(tryStmt as estree.Node);
+    context.report({
+      message: toEncodedMessage(message, openPromises, Array(openPromises.length).fill("Promise")),
+      loc: token!.loc,
+    });
+  }
+}
+
+function checkForUselessCatch(
+  tryStmt: TSESTree.TryStatement,
+  openPromises: TSESTree.Node[],
+  capturedPromises: TSESTree.Node[],
+  context: Rule.RuleContext,
+) {
+  if (openPromises.length === 0 && capturedPromises.length > 0) {
+    const ending = capturedPromises.length > 1 ? "s" : "";
+    const message = `Consider removing this 'try' statement as promise${ending} rejection is already captured by '.catch()' method.`;
+    const token = context.getSourceCode().getFirstToken(tryStmt as estree.Node);
+    context.report({
+      message: toEncodedMessage(
+        message,
+        capturedPromises,
+        Array(capturedPromises.length).fill("Caught promise"),
+      ),
+      loc: token!.loc,
+    });
+  }
+}
+
+function hasThenMethod(node: TSESTree.Node, services: RequiredParserServices, ts: any) {
+  const mapped = services.esTreeNodeToTSNodeMap.get(node);
+  const tp = services.program.getTypeChecker().getTypeAtLocation(mapped);
+  const thenProperty = tp.getProperty("then");
+  return Boolean(thenProperty && thenProperty.flags & ts.SymbolFlags.Method);
+}
+
+function isThened(callExpr: CallLikeExpression) {
+  return (
+    callExpr.parent &&
+    callExpr.parent.type === "MemberExpression" &&
+    callExpr.parent.property.type === "Identifier" &&
+    callExpr.parent.property.name === "then"
+  );
+}
+
+function isCaught(callExpr: CallLikeExpression) {
+  return (
+    callExpr.parent &&
+    callExpr.parent.type === "MemberExpression" &&
+    callExpr.parent.property.type === "Identifier" &&
+    callExpr.parent.property.name === "catch"
+  );
+}
+
+function isCatch(callExpr: CallLikeExpression) {
+  return (
+    callExpr.type === "CallExpression" &&
+    callExpr.callee.type === "MemberExpression" &&
+    callExpr.callee.property.type === "Identifier" &&
+    callExpr.callee.property.name === "catch"
+  );
+}
+
+function childrenOf(node: TSESTree.Node, visitorKeys: SourceCode.VisitorKeys) {
+  const keys = visitorKeys[node.type];
+  const children = [];
+  if (keys) {
+    for (const key of keys) {
+      const child = (node as any)[key];
+      if (Array.isArray(child)) {
+        children.push(...child);
+      } else {
+        children.push(child);
+      }
+    }
+  }
+  return children.filter(Boolean);
+}

eslint-bridge/tests/fixtures/rule-tester-project/tsconfig.json

@@ -1,3 +1,6 @@
-{
-    "include": ["**/file.ts"]
-}
+{
+  "compilerOptions": {
+    "target": "es2018",
+  },
+  "include": ["**/file.ts"]
+}