eslint-plugin-unicorn/rules/prefer-blob-reading-methods.js

More than 100 powerful ESLint rules

import {isMethodCall} from './ast/index.js';

const MESSAGE_ID = 'error';
const messages = {
	[MESSAGE_ID]: 'Prefer `Blob#{{replacement}}()` over `FileReader#{{method}}(blob)`.',
};

/** @param {import('eslint').Rule.RuleContext} context */
const create = () => ({
	CallExpression(node) {
		if (!isMethodCall(node, {
			methods: ['readAsText', 'readAsArrayBuffer'],
			argumentsLength: 1,
			optionalCall: false,
			optionalMember: false,
		})) {
			return;
		}

		const method = node.callee.property;
		const methodName = method.name;

		return {
			node: method,
			messageId: MESSAGE_ID,
			data: {
				method: methodName,
				replacement: methodName === 'readAsArrayBuffer' ? 'arrayBuffer' : 'text',
			},
		};
	},
});

/** @type {import('eslint').Rule.RuleModule} */
const config = {
	create,
	meta: {
		type: 'suggestion',
		docs: {
			description: 'Prefer `Blob#arrayBuffer()` over `FileReader#readAsArrayBuffer(…)` and `Blob#text()` over `FileReader#readAsText(…)`.',
			recommended: true,
		},
		messages,
	},
};

export default config;