@truenine/eslint9-config/dist/rules/code-style/compact-try-catch.cjs

ESLint 9 configuration package for Compose Client projects with TypeScript, Vue, and modern JavaScript support

//#region src/rules/code-style/compact-try-catch.ts
const MAX_SINGLE_LINE_LENGTH = 120;
const rule = {
	meta: {
		type: "layout",
		docs: {
			description: "Enforce compact try-catch-finally layout with independent block optimization",
			recommended: false
		},
		fixable: "whitespace",
		messages: {
			compactCatch: "Catch clause should be on the same line as the try block's closing brace",
			compactFinally: "Finally clause should be on the same line as the previous block's closing brace",
			preferSingleLineTry: "Try block should be compressed to a single line",
			preferSingleLineCatch: "Catch block should be compressed to a single line",
			preferSingleLineFinally: "Finally block should be compressed to a single line"
		},
		schema: []
	},
	create(context) {
		const { sourceCode } = context;
		function isSingleLine(node) {
			const { loc } = node;
			if (!loc) return false;
			return loc.start.line === loc.end.line;
		}
		function canBeSingleLine(block) {
			if (block?.type !== "BlockStatement") return false;
			const bNode = block;
			const { body } = bNode;
			if (body.length === 0) return true;
			if (body.length > 1) return false;
			const stmt = body[0];
			if (![
				"ExpressionStatement",
				"ReturnStatement",
				"ThrowStatement",
				"BreakStatement",
				"ContinueStatement"
			].includes(stmt.type)) return false;
			const stmtLoc = stmt.loc;
			if (!stmtLoc || stmtLoc.start.line !== stmtLoc.end.line) return false;
			if (sourceCode.getText(stmt).trim().length > 100) return false;
			if (getCompactBlockText(bNode).length > MAX_SINGLE_LINE_LENGTH) return false;
			return true;
		}
		function getCompactBlockText(block) {
			const { body } = block;
			if (body.length === 0) return "{}";
			return `{ ${sourceCode.getText(body[0]).trim().replace(/;$/, "")}; }`;
		}
		return { TryStatement(node) {
			const tryNode = node;
			const tryBlock = tryNode.block;
			const { handler, finalizer } = tryNode;
			const tryCanBeSingle = canBeSingleLine(tryBlock);
			const tryIsSingle = isSingleLine(tryBlock);
			if (tryCanBeSingle && !tryIsSingle) context.report({
				node: tryBlock,
				messageId: "preferSingleLineTry",
				fix: (fixer) => fixer.replaceTextRange(tryBlock.range, getCompactBlockText(tryBlock))
			});
			if (handler !== null) {
				const catchBlock = handler.body;
				const catchCanBeSingle = canBeSingleLine(catchBlock);
				const catchIsSingle = isSingleLine(catchBlock);
				if (catchCanBeSingle && !catchIsSingle) context.report({
					node: catchBlock,
					messageId: "preferSingleLineCatch",
					fix: (fixer) => fixer.replaceTextRange(catchBlock.range, getCompactBlockText(catchBlock))
				});
				if (!tryIsSingle && !tryCanBeSingle && !catchIsSingle && !catchCanBeSingle) {
					const tryCloseBrace = sourceCode.getLastToken(tryBlock);
					const catchToken = sourceCode.getFirstToken(handler);
					if (tryCloseBrace !== null && catchToken !== null && tryCloseBrace.loc !== null && catchToken.loc !== null) {
						if (tryCloseBrace.loc.end.line !== catchToken.loc.start.line) {
							const spaceBefore = sourceCode.getTokenBefore(catchToken);
							if (spaceBefore !== null) context.report({
								node: catchToken,
								messageId: "compactCatch",
								fix: (fixer) => fixer.replaceTextRange([spaceBefore.range[1], catchToken.range[0]], " ")
							});
						}
					}
				}
			}
			if (finalizer === null) return;
			const finallyBlock = finalizer;
			const finallyCanBeSingle = canBeSingleLine(finallyBlock);
			const finallyIsSingle = isSingleLine(finallyBlock);
			if (finallyCanBeSingle && !finallyIsSingle) context.report({
				node: finallyBlock,
				messageId: "preferSingleLineFinally",
				fix: (fixer) => fixer.replaceTextRange(finallyBlock.range, getCompactBlockText(finallyBlock))
			});
			const previousBlock = handler !== null ? handler.body : tryBlock;
			const prevCanBeSingle = canBeSingleLine(previousBlock);
			if (!(!isSingleLine(previousBlock) && !prevCanBeSingle) || !(!finallyIsSingle && !finallyCanBeSingle)) return;
			const prevCloseBrace = sourceCode.getLastToken(previousBlock);
			const finallyToken = sourceCode.getFirstTokenBetween(handler ?? tryBlock, finallyBlock, (t) => t.value === "finally");
			if (prevCloseBrace !== null && finallyToken !== null && prevCloseBrace.loc !== null && finallyToken.loc !== null) {
				if (prevCloseBrace.loc.end.line !== finallyToken.loc.start.line) {
					const spaceBefore = sourceCode.getTokenBefore(finallyToken);
					if (spaceBefore !== null) context.report({
						node: finallyToken,
						messageId: "compactFinally",
						fix: (fixer) => fixer.replaceTextRange([spaceBefore.range[1], finallyToken.range[0]], " ")
					});
				}
			}
		} };
	}
};

//#endregion
module.exports = rule;
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