Add rule @typescript-eslint/no-floating-promises

Author: Shinigami92

src/rules/typescript-eslint/index.d.ts

@@ -16,6 +16,7 @@ import type { NamingConventionRule } from './naming-convention';
 import type { NoEmptyFunctionRule } from './no-empty-function';
 import type { NoEmptyInterfaceRule } from './no-empty-interface';
 import type { NoExplicitAnyRule } from './no-explicit-any';
+import type { NoFloatingPromisesRule } from './no-floating-promises';
 import type { NoInferrableTypesRule } from './no-inferrable-types';
 import type { NoParameterPropertiesRule } from './no-parameter-properties';
 import type { NoUnsafeAssignmentRule } from './no-unsafe-assignment';
@@ -48,6 +49,7 @@ export type TypeScriptEslintRules = AdjacentOverloadSignaturesRule &
   NoEmptyFunctionRule &
   NoEmptyInterfaceRule &
   NoExplicitAnyRule &
+  NoFloatingPromisesRule &
   NoInferrableTypesRule &
   NoParameterPropertiesRule &
   NoUnsafeAssignmentRule &

src/rules/typescript-eslint/no-floating-promises.d.ts

@@ -0,0 +1,61 @@
+import type { RuleConfig } from '../rule-config';
+
+/**
+ * Option.
+ */
+export type NoFloatingPromisesOption = {
+  /**
+   * This allows you to stop the rule reporting promises consumed with void operator. This can be a good way to explicitly mark a promise as intentionally not awaited.
+   *
+   * @default true
+   *
+   * @see [ignoreVoid](https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-floating-promises.md#ignorevoid)
+   */
+  ignoreVoid?: boolean;
+  /**
+   * This allows you to skip checking of async iife.
+   *
+   * @default false
+   *
+   * @see [ignoreIIFE](https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-floating-promises.md#ignoreiife)
+   */
+  ignoreIIFE?: boolean;
+};
+
+/**
+ * Options.
+ */
+export type NoFloatingPromisesOptions = [NoFloatingPromisesOption?];
+
+/**
+ * Requires Promise-like values to be handled appropriately.
+ *
+ * This rule forbids usage of Promise-like values in statements without handling their errors appropriately.
+ * Unhandled promises can cause several issues, such as improperly sequenced operations, ignored Promise rejections and more.
+ * Valid ways of handling a Promise-valued statement include awaiting, returning, and either calling `.then()` with two arguments or `.catch()` with one argument.
+ *
+ * @see [no-floating-promises](https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-floating-promises.md)
+ */
+export type NoFloatingPromisesRuleConfig = RuleConfig<NoFloatingPromisesOptions>;
+
+/**
+ * Requires Promise-like values to be handled appropriately.
+ *
+ * This rule forbids usage of Promise-like values in statements without handling their errors appropriately.
+ * Unhandled promises can cause several issues, such as improperly sequenced operations, ignored Promise rejections and more.
+ * Valid ways of handling a Promise-valued statement include awaiting, returning, and either calling `.then()` with two arguments or `.catch()` with one argument.
+ *
+ * @see [no-floating-promises](https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-floating-promises.md)
+ */
+export interface NoFloatingPromisesRule {
+  /**
+   * Requires Promise-like values to be handled appropriately.
+   *
+   * This rule forbids usage of Promise-like values in statements without handling their errors appropriately.
+   * Unhandled promises can cause several issues, such as improperly sequenced operations, ignored Promise rejections and more.
+   * Valid ways of handling a Promise-valued statement include awaiting, returning, and either calling `.then()` with two arguments or `.catch()` with one argument.
+   *
+   * @see [no-floating-promises](https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-floating-promises.md)
+   */
+  '@typescript-eslint/no-floating-promises': NoFloatingPromisesRuleConfig;
+}