Code Inspections in TypeScript
This topic lists all JetBrains Rider code inspections available in TypeScript.
You can toggle specific inspections or change their severity level on the page of JetBrains Rider settings Ctrl+Alt+S.
Inspection | Description | Default Severity |
|---|---|---|
| Redundant type | Checks type arguments for redundancy when a reference provides the type with default values |  Weak warning |
| Equality operator may cause type coercion | Reports usages of equality operators which may cause unexpected type coercions.It is considered a good practice to use the type-safe equality operators === and !==instead of their regular counterparts == and !=. Depending on the option selected, this will either highlight:
| Disabled |
| Reference to a UMD global | Report the use of references to a UMD global if the current file is a module. | Weak warning |
| Import can be shortened | Reports ES6 imports whose from part can be shortened by importing the parent directory. |  Warning |
| Unresolved JavaScript function | Checks that TypeScript called functions are valid. | Weak warning |
| Duplicated type | Checks union and intersection types for duplicates | Warning |
| Abstract class constructor can be made protected | Suggests to make the constructor of an abstract class protected (because it is useless to have it public). | Weak warning |
| Required TypeScript library is not included in tsconfig.json | Checks that the TypeScript library files required for the symbol are listed under the 'lib' compiler option in tsconfig.json. |  Error |
| Variable type is narrowed by a type guard | Highlights variable usages where variable type is narrowed by a type guard.Note that severity level doesn't affect this inspection. | Warning |
| Type mismatch in 'any' type context | Checks TypeScript called function parameters, return values, assigned expressions to be of correct type in any type context. | Weak warning |
| Type mismatch | Checks that TypeScript called function parameters, return values, assigned expressions are of the correct type. | Error |
| Suspicious parameter assignment in constructor | Warns against a common mistake in TypeScript code, when a class field is declared as a constructor parameter, and then this parameter is assigned. | Warning |
| TSLint | Runs TSLint - a linter for TypeScript. | Disabled |
| Missing augmentation import | Checks that current file imports the augmentation module. | |
| Generic type mismatch | Checks that a corresponding type argument is passed when a generic type is used in a function, interface or class declaration | Error |
| Missing option in tsconfig.json | Checks that required options are enabled in tsconfig.json, e.g. when using React JSX in .tsx files, the TypeScript configuration file contains 'jsx: "react"'. | Warning |
| @private and @protected members accessibility | Checks that TypeScript private and protected members are visible in current context. | Weak warning |
| Field is assigned only in the constructor and can be made readonly | If a private field is assigned only in the constructor, it can be made readonly. | Weak warning |
| Unresolved JavaScript variable | Checks that TypeScript referenced variables and fields are valid. | Weak warning |
| Validate tsconfig.json | Validate usages of tsconfig.json properties. | Warning |
| Explicit member types | Highlights type declarations that do not match the current code style. By default, type declarations are highlighted as redundant when the type can be inferred from context, for example: Highlights type declarations that do not match the current code style. Highlights type declarations that do not match the current code style. Enabling any of the options below inverts this and suggests inserting an explicit type declaration even where the type can be inferred. | |
| Validate imports | Validate TypeScript imports. | Error |
No highlighting, only fix