How can one locate exclusively unused JSDoc type definitions?

Question

How can one locate exclusively unused JSDoc type definitions?

For instance:

/**
 * A boolean value.
 * @typedef {boolean} BoolType
 *
 * Another dummy type definition.
 * @typedef {(number|string)} SomeType
 */

/**
 * Set the boolean flag.
 * @param {BoolType} flag - The bool flag value.
 */
function setFlag(flag) {
}

In this code snippet, we have defined BoolType for boolean values, but the SomeType type is not used anywhere in our project. I am interested in identifying and removing such unused type definitions systematically. Our project is based on Node.js with TypeScript integration.

Below is our configuration file named tsconfig.json:

{
  "compilerOptions": {
    "baseUrl": ".",
    "jsx": "react",
    "allowJs": true,
    "checkJs": true,
    "target": "ESNext",
    "noEmit": true,
    "moduleResolution": "node",
    "isolatedModules": true,
    "esModuleInterop": true,
    "resolveJsonModule": true,
    "strictNullChecks": true,
  },
}

javascript typescript jsdoc

Answer 1

Answer №1

While I may not be well-versed in AST tools, which are typically used for locating certain information, I can provide an example to help illustrate a concept:

Imagine you have a JavaScript file named ./module.mjs. Now, consider another module called ./find-typedefs.mjs:

import {promises as fs} from 'fs';

function getTypedefNames (sourceText) {
  const regex = /@typedef\s+{[^}]+}\s+[A-Za-z]+/g;
  return [...new Set((sourceText.match(regex) ?? [])
    .map(str => str.split(/\s+/).slice(-1)[0]))];
}

async function main () {
  const [filePath] = process.argv.slice(2)
  const text = await fs.readFile(filePath, {encoding: 'utf8'});
  const names = getTypedefNames(text);
  console.log(names.join('\n'));
}

main();

Executing this file will produce the following output:

$ node find-typedefs.mjs module.mjs
NumberLike
StringLike

By utilizing the getTypedefNames function and potentially building upon it with additional abstractions, you could automate the process of searching through your project files to generate a list of names that can be further examined or counted within each file. If you're using an editor such as VS Code, you can even use regular expressions (similar to the one in the function) directly within the Find menu.

Hopefully, this method will help streamline the task of manually scanning through code.

Answer 2

While I may not be well-versed in AST tools, which are typically used for locating certain information, I can provide an example to help illustrate a concept:

Imagine you have a JavaScript file named ./module.mjs. Now, consider another module called ./find-typedefs.mjs:

import {promises as fs} from 'fs';

function getTypedefNames (sourceText) {
  const regex = /@typedef\s+{[^}]+}\s+[A-Za-z]+/g;
  return [...new Set((sourceText.match(regex) ?? [])
    .map(str => str.split(/\s+/).slice(-1)[0]))];
}

async function main () {
  const [filePath] = process.argv.slice(2)
  const text = await fs.readFile(filePath, {encoding: 'utf8'});
  const names = getTypedefNames(text);
  console.log(names.join('\n'));
}

main();

Executing this file will produce the following output:

$ node find-typedefs.mjs module.mjs
NumberLike
StringLike

By utilizing the getTypedefNames function and potentially building upon it with additional abstractions, you could automate the process of searching through your project files to generate a list of names that can be further examined or counted within each file. If you're using an editor such as VS Code, you can even use regular expressions (similar to the one in the function) directly within the Find menu.

Hopefully, this method will help streamline the task of manually scanning through code.

How can one locate exclusively unused JSDoc type definitions?

Answer №1

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