Hello Polymer Community: New user here having a bit of trouble with lit-element with TS, and not sure why.
I have TS setup and working fine (compiled other TS examples). Did npm install lit-element per Getting Started page. https://lit-element.polymer-project.org/guide/start Trying the TS example under the section: *"Use LitElement TypeScript decorators"* and getting all kinds of bad happening. tsc my-element.ts results in complete fail: my-element.ts:14:14 - error TS1219: Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option in your 'tsconfig' or 'jsconfig' to remove this warning. 14 export class MyElement extends LitElement { ~~~~~~~~~ my-element.ts:20:3 - error TS1219: Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option in your 'tsconfig' or 'jsconfig' to remove this warning. 20 foo = 'foo'; ~~~ node_modules/lit-element/lib/updating-element.d.ts:102:38 - error TS2583: Cannot find name 'Map'. Do you need to change your target library? Try changing the `lib` compiler option to es2015 or later. 102 export declare type PropertyValues = Map<PropertyKey, unknown>; ~~~ node_modules/lit-html/lib/parts.d.ts:18:63 - error TS2304: Cannot find name 'Iterable'. 18 export declare const isIterable: (value: unknown) => value is Iterable<unknown>; ~~~~~~~~ node_modules/lit-html/lib/render.d.ts:16:29 - error TS2583: Cannot find name 'WeakMap'. Do you need to change your target library? Try changing the `lib` compiler option to es2015 or later. 16 export declare const parts: WeakMap<Node, NodePart>; ~~~~~~~ node_modules/lit-html/lib/template-factory.d.ts:56:28 - error TS2583: Cannot find name 'WeakMap'. Do you need to change your target library? Try changing the `lib` compiler option to es2015 or later. 56 readonly stringsArray: WeakMap<TemplateStringsArray, Template>; ~~~~~~~ node_modules/lit-html/lib/template-factory.d.ts:57:25 - error TS2583: Cannot find name 'Map'. Do you need to change your target library? Try changing the `lib` compiler option to es2015 or later. 57 readonly keyString: Map<string, Template>; ~~~ node_modules/lit-html/lib/template-factory.d.ts:59:38 - error TS2583: Cannot find name 'Map'. Do you need to change your target library? Try changing the `lib` compiler option to es2015 or later. 59 export declare const templateCaches: Map<string, templateCache>; ~~~ Found 8 errors. I have no idea how to press forward and really want to work with web components and TS for a new project. My tsconfig.json is: { "compilerOptions": { "target": "es6", "module": "es6" } } I have also tried with no tsconfig file. Same results. Please kind people help point me in the right direction. Thank you. David Follow Polymer on Google+: plus.google.com/107187849809354688692 --- You received this message because you are subscribed to the Google Groups "Polymer" group. To unsubscribe from this group and stop receiving emails from it, send an email to polymer-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/polymer-dev/3efd3a8b-6637-491e-86ae-9aeb0c1cecc2%40googlegroups.com.
