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Code Inspection and Quick-Fixes in JavaScript

The key features of ReSharper's code analysis are also supported in JavaScript. You can find the detailed information on these features in the corresponding topics of the Code Analysis section. In the main topic of the section, you can also find the feature matrix and check what exactly is supported in JavaScript.

In this topic, you can find some examples of using code analysis features in JavaScript:

Code inspection

ReSharper's static code analysis can detect about a hundred different errors and problems in JavaScript code.

The analysis is performed by applying code inspections to the current document or in any specified scope.

To look through the list of available inspections for JavaScript, open the Code Inspections | Inspection Severity options page, and then switch to the JS tab.

Resolving global variables

ReSharper highlights usages of undefined variables as warnings. There are cases, however, when these usages are valid. For instance, some variables can be defined directly in the markup.

One way to deal with this, is to disable or suppress the corresponding code inspection. However, you can define such variables using the // global comment. In this case, the inspection will stay active and help you to find typos in variable names.

You can place these comments either at the top of the current file or use a single file for all global variables of the project. Each variable requires a new comment, e.g.: // global variableName

Quick-fixes

ReSharper provides dozens of quick-fixes for JavaScript. Here are some examples:

Create from usage

This is one of the most useful quick-fixes. Whenever you use anything that was not declared, ReSharper can help you create a valid declaration taking into account the usage and the surrounding context.

Specify qualifier explicitly

In case an explicit qualifier is missing, use this quick-fix to add a qualifier.

ReSharper_by_Language__JavaScript__Quick-Fixes__specify_qualifier_explicitly_01

Declare local variable

When ReSharper finds out that a variable has been assigned without being declared, use this quick-fix to transform the assignment into a variable declaration.

ReSharper_by_Language__JavaScript__Quick-Fixes__declare_local_variable_01

See Also

Last modified: 27 August 2015