Using the ESLint Tool

Find Tips and tricks on how to better use the Zeus IDE. Feel free to post your own tips but please do not post bug reports, feature requests or questions here.
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jussij
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Joined: Fri Aug 13, 2004 5:10 pm

Using the ESLint Tool

Post by jussij » Tue May 12, 2020 1:30 am

Here are the instructions on how to use the ESLint tool: https://eslint.org/

Installing Node.js
ESLint requires Node.js so make sure it has been installed as per the details found here: https://nodejs.org/

Installing ESLint
The full ESLint installation details can be found here: https://eslint.org/docs/user-guide/getting-started

Here is a summary of those instruction:

1. Run this command to install EsLint:

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npm install eslint --save-dev
IMPORTANT: Depending on your Windows security settings this command may require admin rights to run correctly.

2. Using the command line prompt, create a simple test JScript project as follows:

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md c:\projects\tutorial
cd c:\projects\tutorial
npm init
This will create a package.json project file as needed by ESLint tool.

Create a simple test.js file in that project folder as follows:

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var foo = bar;

function addOne(i) {
    if (i != NaN) {
        return i ++
    } else {
      return
    }
};
3. Run this command to initialise ESLint for that project:

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npx eslint --init
IMPORTANT: Depending on your Windows security settings this command may require admin rights to run correctly.

4. Run this command to test check the linter:

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npx eslint test.js
That command should result in this output::

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C:\Tutorial\JScript\test.js
  1:5   error  'foo' is assigned a value but never used    no-unused-vars
  1:11  error  'bar' is not defined                        no-undef
  3:10  error  'addOne' is defined but never used          no-unused-vars
  4:9   error  Use the isNaN function to compare with NaN  use-isnan
  9:2   error  Unnecessary semicolon                       no-extra-semi

5 problems (5 errors, 0 warnings)
1 error and 0 warnings potentially fixable with the `--fix` option.
Running ESLint from Inside Zeus
To run the linter inside Zeus edit the JScript Document Type using the Options, Document Types menu and inside the Compiler panel enter this command as the Command Line:

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npx eslint -f codeframe test.js
Open the test.js file and use the Compiler, Compile menu to run the linter for this file.

Using that menu will produce this output inside Zeus:
js-eslint.png
js-eslint.png (189.11 KiB) Viewed 116 times

Clicking on the errors from that output will navigate to the line of code in the source file with the reported error.

Cheers Jussi

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