21 lines
774 B
TypeScript
21 lines
774 B
TypeScript
import * as Lint from "tslint/lib/lint";
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import * as ts from "typescript";
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export class Rule extends Lint.Rules.AbstractRule {
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public static FAILURE_STRING = "Don't use the 'in' keyword - use 'hasProperty' to check for key presence instead";
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public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
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return this.applyWithWalker(new InWalker(sourceFile, this.getOptions()));
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}
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}
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class InWalker extends Lint.RuleWalker {
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visitNode(node: ts.Node) {
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super.visitNode(node);
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if (node.kind === ts.SyntaxKind.InKeyword && node.parent && node.parent.kind === ts.SyntaxKind.BinaryExpression) {
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this.addFailure(this.createFailure(node.getStart(), node.getWidth(), Rule.FAILURE_STRING));
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}
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}
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}
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