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packages/rules/src/curlyStatementNewlinesRule.ts

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+import * as ts from "typescript";
+import * as Lint from "tslint";
+
+/**
+ * Curly statement newlines rule.
+ */
+export class Rule extends Lint.Rules.AbstractRule {
+
+	public static FAILURE_STRING = "curly statements must separate with newlines";
+
+	/**
+	 * Apply the rule.
+	 */
+	public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
+		return this.applyWithWalker(new CurlyStatementNewlinesWalker(sourceFile, this.getOptions()));
+	}
+
+}
+
+/**
+ * Curly statement newlines walker.
+ */
+class CurlyStatementNewlinesWalker extends Lint.RuleWalker {
+
+	/**
+	 * Visit if statements.
+	 */
+	public visitIfStatement(node: ts.IfStatement): void {
+		const splitLength = node.getFullText().split("\n").length;
+		if (splitLength <= 2) {
+			this.addFailureAt(node.getStart(), node.getWidth(), Rule.FAILURE_STRING);
+		}
+
+		super.visitIfStatement(node);
+	}
+
+}