{ "compilerOptions": { // Language Options "target": "ES2021", "lib": ["ES2021", "DOM", "DOM.Iterable", "WebWorker"], "experimentalDecorators": true, // Modules "module": "ESNext", "moduleResolution": "node", "resolveJsonModule": true, // Babel handles transpiling and no need for declaration files "noEmit": true, // Type checking options "noUnusedLocals": true, "noUnusedParameters": true, "noImplicitReturns": true, "noFallthroughCasesInSwitch": true, "strict": true, "noImplicitAny": false, // Do not check type declaration files "skipLibCheck": true, // Interop with CommonJS and other tools "esModuleInterop": true, "isolatedModules": true, "plugins": [ { "name": "ts-lit-plugin", "strict": true, "rules": { // Custom elements "no-missing-element-type-definition": "error", // Binding names "no-legacy-attribute": "error", // Binding types "no-boolean-in-attribute-binding": "warning", "no-expressionless-property-binding": "warning", "no-complex-attribute-binding": "warning", "no-nullable-attribute-binding": "warning", "no-incompatible-type-binding": "warning", // LitElement "no-incompatible-property-type": "warning", "no-property-visibility-mismatch": "warning", // CSS "no-invalid-css": "off" // warning does not work } } ] } }