upgrade eslint plugins, turn off new rules, convert errors to warnings

package.json

@@ -65,16 +65,16 @@
     "@rollup/plugin-virtual": "^2.0.0",
     "@types/mocha": "^5.2.7",
     "@types/node": "^8.10.53",
-    "@typescript-eslint/eslint-plugin": "^1.13.0",
-    "@typescript-eslint/parser": "^2.1.0",
+    "@typescript-eslint/eslint-plugin": "^3.0.2",
+    "@typescript-eslint/parser": "^3.0.2",
     "acorn": "^7.1.0",
     "agadoo": "^1.1.0",
     "c8": "^5.0.1",
     "code-red": "0.1.1",
     "codecov": "^3.5.0",
     "css-tree": "1.0.0-alpha22",
-    "eslint": "^6.3.0",
-    "eslint-plugin-import": "^2.18.2",
+    "eslint": "^7.1.0",
+    "eslint-plugin-import": "^2.20.2",
     "eslint-plugin-svelte3": "^2.7.3",
     "estree-walker": "^1.0.0",
     "is-reference": "^1.1.4",

src/compiler/compile/render_dom/Block.ts

@@ -413,7 +413,7 @@ export default class Block {
 					return ${block};`
 		: b`
 					return ${return_value};`
-			}
+}
 		`;
 
 		return body;

src/compiler/compile/render_dom/wrappers/Element/Binding.ts

@@ -269,7 +269,7 @@ function get_event_handler(
 		mutation: (Node | Node[]);
 		contextual_dependencies: Set<string>;
 		lhs?: Node;
-} {
+	} {
 	const value = get_value_from_dom(renderer, binding.parent, binding);
 	const contextual_dependencies = new Set(binding.node.expression.contextual_dependencies);
 

src/compiler/compile/render_dom/wrappers/IfBlock.ts

@@ -536,7 +536,7 @@ export default class IfBlockWrapper extends Wrapper {
 						b`if (${block.renderer.dirty(branch.dependencies)}) {
 							@transition_in(${name}, 1);
 						}`
-					}
+}
 				} else {
 					${name} = ${branch.block.name}(#ctx);
 					${name}.c();

src/runtime/internal/Component.ts

@@ -19,7 +19,6 @@ interface Fragment {
 	/* outro   */ o: (local: any) => void;
 	/* destroy */ d: (detaching: 0|1) => void;
 }
-// eslint-disable-next-line @typescript-eslint/class-name-casing
 interface T$$ {
 	dirty: number[];
 	ctx: null|any;

src/runtime/store/index.ts

@@ -184,7 +184,7 @@ export function derived<T>(stores: Stores, fn: Function, initial_value?: T): Rea
 			},
 			() => {
 				pending |= (1 << i);
-			}),
+			})
 		);
 
 		inited = true;