Merge pull request #4 from sveltejs/master

Merge changes
5 years ago · fd32d88ce2
parent 2613097445 b5b02f8561
commit fd32d88ce2
67 changed files with 780 additions and 399 deletions
--- a/.mocharc.js
+++ b/.mocharc.js
@ -0,0 +1,15 @@
+module.exports = {
+	file: [
+		'test/test.js'
+	]
+};
+
+// add coverage options when running 'npx c8 mocha'
+if (process.env.NODE_V8_COVERAGE) {
+	Object.assign(module.exports, {
+		fullTrace: true,
+		require: [
+			'source-map-support/register'
+		]
+	});
+}
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -2,7 +2,25 @@

 ## Unreleased

+* Support `use:obj.method` as actions ([#3935](https://github.com/sveltejs/svelte/issues/3935))
+* Support `_` as numeric separator ([#5407](https://github.com/sveltejs/svelte/issues/5407))
+* Fix assignments to properties on store values ([#5412](https://github.com/sveltejs/svelte/issues/5412))
+* Add special style scoping handling of `[open]` selectors on `<details>` elements ([#5421](https://github.com/sveltejs/svelte/issues/5421))
+* Support `import.meta` in template expressions ([#5422](https://github.com/sveltejs/svelte/issues/5422))
+
+## 3.25.1
+
+* Fix specificity of certain styles involving a child selector ([#4795](https://github.com/sveltejs/svelte/issues/4795))
+* Fix transitions that are parameterised with stores ([#5244](https://github.com/sveltejs/svelte/issues/5244))
+* Fix scoping of styles involving child selector and `*` ([#5370](https://github.com/sveltejs/svelte/issues/5370))
+* Fix destructuring which reassigns stores ([#5388](https://github.com/sveltejs/svelte/issues/5388))
+* Fix `{#await}`s with no `{:catch}` getting stuck unresolved if the promise rejects ([#5401](https://github.com/sveltejs/svelte/issues/5401))
+
+## 3.25.0
+
+* Use `null` rather than `undefined` for coerced bound value of `<input type="number">` ([#1701](https://github.com/sveltejs/svelte/issues/1701))
 * Expose object of which slots have received content in `$$slots` ([#2106](https://github.com/sveltejs/svelte/issues/2106))
+* Correctly disallow using lifecycle hooks after synchronous component initialisation ([#4259](https://github.com/sveltejs/svelte/issues/4259), [#4899](https://github.com/sveltejs/svelte/issues/4899))
 * Re-throw an unhandled rejection when an `{#await}` block with no `{:catch}` gets a rejection ([#5129](https://github.com/sveltejs/svelte/issues/5129))
 * Add types to `createEventDispatcher` ([#5211](https://github.com/sveltejs/svelte/issues/5211))
 * In SSR mode, do not automatically declare variables for reactive assignments to member expressions ([#5247](https://github.com/sveltejs/svelte/issues/5247))
@ -11,6 +29,8 @@
 * Fix using `<svelte:component>` in `{:catch}` ([#5259](https://github.com/sveltejs/svelte/issues/5259))
 * Fix setting one-way bound `<input>` `value` to `undefined` when it has spread attributes ([#5270](https://github.com/sveltejs/svelte/issues/5270))
 * Fix deep two-way bindings inside an `{#each}` involving a store ([#5286](https://github.com/sveltejs/svelte/issues/5286))
+* Use valid XHTML for elements that are optimised and inserted with `.innerHTML` ([#5315](https://github.com/sveltejs/svelte/issues/5315))
+* Fix reactivity of `$$props` in slot fallback content ([#5367](https://github.com/sveltejs/svelte/issues/5367))

 ## 3.24.1

--- a/mocha.coverage.opts
+++ b/mocha.coverage.opts
@ -1,4 +0,0 @@
--require source-map-support/register
--full-trace
--recursive
-test/test.js
--- a/mocha.opts
+++ b/mocha.opts
@ -1 +0,0 @@
-test/test.js
--- a/package-lock.json
+++ b/package-lock.json
@ -1,6 +1,6 @@
 {
  "name": "svelte",
-  "version": "3.24.1",
+  "version": "3.25.1",
  "lockfileVersion": 1,
  "requires": true,
  "dependencies": {
@ -197,9 +197,9 @@
      "dev": true
    },
    "@types/mocha": {
-      "version": "5.2.7",
-      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-5.2.7.tgz",
-      "integrity": "sha512-NYrtPht0wGzhwe9+/idPaBB+TqkY9AhTvOLMkThm0IoEfLaiVQZwBwyJ5puCkO3AUCWrmcoePjp2mbFocKy4SQ==",
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-7.0.2.tgz",
+      "integrity": "sha512-ZvO2tAcjmMi8V/5Z3JsyofMe3hasRcaw88cto5etSVMwVQfeivGAlEYmaQgceUSVYFofVjT+ioHsATjdWcFt1w==",
      "dev": true
    },
    "@types/node": {
@ -315,9 +315,9 @@
      "dev": true
    },
    "acorn": {
-      "version": "7.3.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.3.1.tgz",
-      "integrity": "sha512-tLc0wSnatxAQHVHUapaHdz72pi9KUyHjq5KyHjGg9Y8Ifdc79pTh2XvI6I1/chZbnM7QtNKzh66ooDogPZSleA==",
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.0.tgz",
+      "integrity": "sha512-+G7P8jJmCHr+S+cLfQxygbWhXy+8YTVGzAkpEbcLo2mLoL7tij/VG41QSHACSf5QgYRhMZYHuNc6drJaO0Da+w==",
      "dev": true
    },
    "acorn-globals": {
@ -422,6 +422,16 @@
      "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8=",
      "dev": true
    },
+    "anymatch": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz",
+      "integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==",
+      "dev": true,
+      "requires": {
+        "normalize-path": "^3.0.0",
+        "picomatch": "^2.0.4"
+      }
+    },
    "argparse": {
      "version": "1.0.10",
      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@ -630,6 +640,12 @@
        "tweetnacl": "^0.14.3"
      }
    },
+    "binary-extensions": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.1.0.tgz",
+      "integrity": "sha512-1Yj8h9Q+QDF5FzhMs/c9+6UntbD5MkRfRwac8DoEm9ZfUBZ7tZ55YcGVAzEe4bXsdQHEk+s9S5wsOKVdZrw0tQ==",
+      "dev": true
+    },
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      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@ -640,6 +656,15 @@
        "concat-map": "0.0.1"
      }
    },
+    "braces": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
+      "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
+      "dev": true,
+      "requires": {
+        "fill-range": "^7.0.1"
+      }
+    },
    "browser-process-hrtime": {
      "version": "0.1.3",
      "resolved": "https://registry.npmjs.org/browser-process-hrtime/-/browser-process-hrtime-0.1.3.tgz",
@ -736,6 +761,22 @@
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      "dev": true
    },
+    "chokidar": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.3.0.tgz",
+      "integrity": "sha512-dGmKLDdT3Gdl7fBUe8XK+gAtGmzy5Fn0XkkWQuYxGIgWVPPse2CxFA5mtrlD0TOHaHjEUqkWNyP1XdHoJES/4A==",
+      "dev": true,
+      "requires": {
+        "anymatch": "~3.1.1",
+        "braces": "~3.0.2",
+        "fsevents": "~2.1.1",
+        "glob-parent": "~5.1.0",
+        "is-binary-path": "~2.1.0",
+        "is-glob": "~4.0.1",
+        "normalize-path": "~3.0.0",
+        "readdirp": "~3.2.0"
+      }
+    },
    "cli-cursor": {
      "version": "3.1.0",
      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
@ -762,12 +803,6 @@
        "wrap-ansi": "^5.1.0"
      }
    },
-    "code-point-at": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
-      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
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@ -1020,23 +1055,36 @@
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      "dev": true,
      "requires": {
-        "es-to-primitive": "^1.2.0",
+        "es-to-primitive": "^1.2.1",
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        "has": "^1.0.3",
-        "is-callable": "^1.1.4",
-        "is-regex": "^1.0.4",
-        "object-keys": "^1.0.12"
+        "has-symbols": "^1.0.1",
+        "is-callable": "^1.2.0",
+        "is-regex": "^1.1.0",
+        "object-inspect": "^1.7.0",
+        "object-keys": "^1.1.1",
+        "object.assign": "^4.1.0",
+        "string.prototype.trimend": "^1.0.1",
+        "string.prototype.trimstart": "^1.0.1"
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+          "dev": true
+        }
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-      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.0.tgz",
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@ -1722,6 +1770,15 @@
        "flat-cache": "^2.0.1"
      }
    },
+    "fill-range": {
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+      "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
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@ -1790,6 +1847,13 @@
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@ -2204,16 +2268,25 @@
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@ -2259,12 +2338,20 @@
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-      "integrity": "sha1-VRdIm1RwkbCTDglWVM7SXul+lJE=",
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+        "has-symbols": "^1.0.1"
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@ -2677,50 +2765,21 @@
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-        "log-symbols": "2.2.0",
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-        "yargs": "13.2.2",
-        "yargs-parser": "13.0.0",
-        "yargs-unparser": "1.5.0"
+        "yargs": "13.3.2",
+        "yargs-parser": "13.1.2",
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@ -2894,9 +2881,9 @@
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@ -2904,17 +2891,17 @@
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@ -2935,6 +2922,12 @@
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      }
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+    },
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@ -2944,12 +2937,6 @@
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@ -2993,13 +2980,13 @@
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-      "integrity": "sha1-h1jIRvW0B62rDyNuCYbxSwUcqhY=",
+      "version": "2.1.0",
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-        "define-properties": "^1.1.2",
-        "es-abstract": "^1.5.1"
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.0-next.1"
      }
    },
    "object.values": {
@ -3253,6 +3240,12 @@
        "is-reference": "^1.1.4"
      }
    },
+    "picomatch": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.2.2.tgz",
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+    },
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      "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
@ -3466,6 +3459,15 @@
        "util-deprecate": "~1.0.1"
      }
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+    "readdirp": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.2.0.tgz",
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@ -4257,6 +4259,15 @@
        "os-tmpdir": "~1.0.2"
      }
    },
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+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
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+      "dev": true,
+      "requires": {
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+      }
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@ -4616,135 +4627,38 @@
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-      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.5.0.tgz",
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+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
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      "requires": {
        "flat": "^4.1.0",
-        "lodash": "^4.17.11",
-        "yargs": "^12.0.5"
+        "lodash": "^4.17.15",
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-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
-          "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
+          "version": "13.3.2",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
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          "dev": true,
          "requires": {
-            "cliui": "^4.0.0",
-            "decamelize": "^1.2.0",
+            "cliui": "^5.0.0",
            "find-up": "^3.0.0",
-            "get-caller-file": "^1.0.1",
-            "os-locale": "^3.0.0",
+            "get-caller-file": "^2.0.1",
            "require-directory": "^2.1.1",
-            "require-main-filename": "^1.0.1",
+            "require-main-filename": "^2.0.0",
            "set-blocking": "^2.0.0",
-            "string-width": "^2.0.0",
+            "string-width": "^3.0.0",
            "which-module": "^2.0.0",
-            "y18n": "^3.2.1 || ^4.0.0",
-            "yargs-parser": "^11.1.1"
+            "y18n": "^4.0.0",
+            "yargs-parser": "^13.1.2"
          }
        },
        "yargs-parser": {
-          "version": "11.1.1",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
-          "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
+          "version": "13.1.2",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+          "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
          "dev": true,
          "requires": {
            "camelcase": "^5.0.0",
--- a/package.json
+++ b/package.json
@ -1,6 +1,6 @@
 {
  "name": "svelte",
-  "version": "3.24.1",
+  "version": "3.25.1",
  "description": "Cybernetically enhanced web apps",
  "module": "index.mjs",
  "main": "index",
@ -23,10 +23,10 @@
  },
  "types": "types/runtime/index.d.ts",
  "scripts": {
-    "test": "mocha --opts mocha.opts",
+    "test": "mocha",
    "test:unit": "mocha --require sucrase/register --recursive src/**/__test__.ts",
-    "quicktest": "mocha --opts mocha.opts",
-    "precoverage": "c8 mocha --opts mocha.coverage.opts",
+    "quicktest": "mocha",
+    "precoverage": "c8 mocha",
    "coverage": "c8 report --reporter=text-lcov > coverage.lcov && c8 report --reporter=html",
    "codecov": "codecov",
    "precodecov": "npm run coverage",
@ -64,11 +64,11 @@
    "@rollup/plugin-typescript": "^2.0.1",
    "@rollup/plugin-virtual": "^2.0.0",
    "@sveltejs/eslint-config": "github:sveltejs/eslint-config#v5.0.0",
-    "@types/mocha": "^5.2.7",
+    "@types/mocha": "^7.0.0",
    "@types/node": "^8.10.53",
    "@typescript-eslint/eslint-plugin": "^3.0.2",
    "@typescript-eslint/parser": "^3.0.2",
-    "acorn": "^7.3.1",
+    "acorn": "^7.4.0",
    "agadoo": "^1.1.0",
    "c8": "^5.0.1",
    "code-red": "^0.1.3",
@ -83,7 +83,7 @@
    "kleur": "^3.0.3",
    "locate-character": "^2.0.5",
    "magic-string": "^0.25.3",
-    "mocha": "^6.2.0",
+    "mocha": "^7.0.0",
    "periscopic": "^2.0.1",
    "puppeteer": "^2.1.1",
    "rollup": "^1.27.14",
--- a/site/Makefile
+++ b/site/Makefile
@ -9,7 +9,7 @@ sapper:
 	@echo "\n~> updating template & contributors list"
 	@npm run update
 	@echo "\n~> building Sapper app"
-	@npm run sapper
+	@npm run build


 docker:
--- a/site/README.md
+++ b/site/README.md
@ -47,7 +47,7 @@ In order for the REPL's GitHub integration to work properly when running locally

 ## Building the site

-To build the website, run `npm run sapper`. The output can be found in `__sapper__/build`.
+To build the website, run `npm run build`. The output can be found in `__sapper__/build`.

 ## Testing

--- a/site/content/docs/02-template-syntax.md
+++ b/site/content/docs/02-template-syntax.md
@ -107,7 +107,7 @@ An element or component can have multiple spread attributes, interspersed with r

 ---

-*`$$props`* references all props that are passed to a component – including ones that are not declared with `export`. It is useful in rare cases, but not generally recommended, as it is difficult for Svelte to optimise.
+*`$$props`* references all props that are passed to a component, including ones that are not declared with `export`. It is not generally recommended, as it is difficult for Svelte to optimise. But it can be useful in rare cases – for example, when you don't know at compile time what props might be passed to a component.

 ```sv
 <Widget {...$$props}/>
@ -115,7 +115,7 @@ An element or component can have multiple spread attributes, interspersed with r

 ---

-*`$$restProps`* contains only the props which are *not* declared with `export`. It can be used to pass down other unknown attributes to an element in a component.
+*`$$restProps`* contains only the props which are *not* declared with `export`. It can be used to pass down other unknown attributes to an element in a component. It shares the same optimisation problems as *`$$props`*, and is likewise not recommended.

 ```html
 <input {...$$restProps}>
--- a/site/content/faq/200-are-there-any-video-courses.md
+++ b/site/content/faq/200-are-there-any-video-courses.md
@ -6,9 +6,9 @@ Rich Harris, the creator of Svelte, taught a course:

 - [Frontend Masters](https://frontendmasters.com/courses/svelte/)

-There are also a couple of third-party courses:
+There are also a number of third-party courses:

- [Egghead](https://egghead.io/playlists/getting-started-with-svelte-3-05a8541a)
- [Udemy](https://www.udemy.com/sveltejs-the-complete-guide/)
+- [Egghead](https://egghead.io/browse/frameworks/svelte)
+- [Udemy](https://www.udemy.com/courses/search/?q=sveltejs+svelte)

 Note that Udemy very frequently has discounts over 90%.
--- a/site/content/faq/250-are-there-any-books.md
+++ b/site/content/faq/250-are-there-any-books.md
@ -0,0 +1,9 @@
+---
+question: Are there any books?
+---
+
+There are a few books:
+
+- [Svelte Handbook](https://flaviocopes.com/page/download-svelte-handbook/) by Flavio Copes
+- [Svelte 3 Up and Running](https://www.amazon.com/dp/B08D6T6BKS/) by Alessandro Segala
+- [Svelte and Sapper in Action](https://www.manning.com/books/svelte-and-sapper-in-action) by R. Mark Volkmann
--- a/site/content/tutorial/03-props/03-spread-props/text.md
+++ b/site/content/tutorial/03-props/03-spread-props/text.md
@ -2,10 +2,10 @@
 title: Spread props
 ---

-If you have an object of properties, you can 'spread' them on to a component instead of specifying each one:
+If you have an object of properties, you can 'spread' them onto a component instead of specifying each one:

 ```html
 <Info {...pkg}/>
 ```

-> Conversely, if you need to reference all the props that were passed into a component, including ones that weren't declared with `export`, you can do so by accessing `$$props` directly. It's not generally recommended, as it's difficult for Svelte to optimise, but it's useful in rare cases.
+> Conversely, if you need to reference all the props that were passed into a component, including ones that weren't declared with `export`, you can do so by accessing `$$props` directly. It's not generally recommended, as it's difficult for Svelte to optimise, but it's useful in rare cases.
--- a/site/content/tutorial/13-classes/01-classes/app-a/App.svelte
+++ b/site/content/tutorial/13-classes/01-classes/app-a/App.svelte
@ -7,23 +7,23 @@
 		display: block;
 	}

-	.active {
+	.selected {
 		background-color: #ff3e00;
 		color: white;
 	}
 </style>

 <button
-	class="{current === 'foo' ? 'active' : ''}"
+	class="{current === 'foo' ? 'selected' : ''}"
 	on:click="{() => current = 'foo'}"
 >foo</button>

 <button
-	class="{current === 'bar' ? 'active' : ''}"
+	class="{current === 'bar' ? 'selected' : ''}"
 	on:click="{() => current = 'bar'}"
 >bar</button>

 <button
-	class="{current === 'baz' ? 'active' : ''}"
+	class="{current === 'baz' ? 'selected' : ''}"
 	on:click="{() => current = 'baz'}"
 >baz</button>
--- a/site/content/tutorial/13-classes/01-classes/app-b/App.svelte
+++ b/site/content/tutorial/13-classes/01-classes/app-b/App.svelte
@ -7,23 +7,23 @@
 		display: block;
 	}

-	.active {
+	.selected {
 		background-color: #ff3e00;
 		color: white;
 	}
 </style>

 <button
-	class:active="{current === 'foo'}"
+	class:selected="{current === 'foo'}"
 	on:click="{() => current = 'foo'}"
 >foo</button>

 <button
-	class:active="{current === 'bar'}"
+	class:selected="{current === 'bar'}"
 	on:click="{() => current = 'bar'}"
 >bar</button>

 <button
-	class:active="{current === 'baz'}"
+	class:selected="{current === 'baz'}"
 	on:click="{() => current = 'baz'}"
 >baz</button>
--- a/site/content/tutorial/13-classes/01-classes/text.md
+++ b/site/content/tutorial/13-classes/01-classes/text.md
@ -6,7 +6,7 @@ Like any other attribute, you can specify classes with a JavaScript attribute, s

 ```html
 <button
-	class="{current === 'foo' ? 'active' : ''}"
+	class="{current === 'foo' ? 'selected' : ''}"
 	on:click="{() => current = 'foo'}"
 >foo</button>
 ```
@ -15,9 +15,9 @@ This is such a common pattern in UI development that Svelte includes a special d

 ```html
 <button
-	class:active="{current === 'foo'}"
+	class:selected="{current === 'foo'}"
 	on:click="{() => current = 'foo'}"
 >foo</button>
 ```

-The `active` class is added to the element whenever the value of the expression is truthy, and removed when it's falsy.
+The `selected` class is added to the element whenever the value of the expression is truthy, and removed when it's falsy.
--- a/site/package-lock.json
+++ b/site/package-lock.json
@ -1449,9 +1449,9 @@
      }
    },
    "@sveltejs/site-kit": {
-      "version": "1.2.4",
-      "resolved": "https://registry.npmjs.org/@sveltejs/site-kit/-/site-kit-1.2.4.tgz",
-      "integrity": "sha512-W+/PthWX4R8UvKr+IyWIITGoY3cl/54ePZr3dU9ZlyP9r/weEvvKDBvjmW8tAKQFRfbxyySmXUxEGBoPhF8XAA==",
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/@sveltejs/site-kit/-/site-kit-1.2.5.tgz",
+      "integrity": "sha512-fA1YWW4tYOxPRVocx+jF4S2LGamku8xeKx/+J5aY7ZCbwuo/c4VF+T0K7WuQRI8U6Dw3pJqdiCra+xH4TnCGRw==",
      "dev": true,
      "requires": {
        "@sindresorhus/slugify": "^0.9.1",
@ -2857,9 +2857,9 @@
      }
    },
    "node-fetch": {
-      "version": "2.6.0",
-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.0.tgz",
-      "integrity": "sha512-8dG4H5ujfvFiqDmVu9fQ5bOHUC15JMjMY/Zumv26oOvvVJjM67KF8koCWIabKQ1GJIa9r2mMZscBq/TbdOcmNA==",
+      "version": "2.6.1",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.1.tgz",
+      "integrity": "sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw==",
      "dev": true
    },
    "node-pg-migrate": {
@ -3518,12 +3518,6 @@
        "fsevents": "~2.1.2"
      }
    },
-    "rollup-dependency-tree": {
-      "version": "0.0.11",
-      "resolved": "https://registry.npmjs.org/rollup-dependency-tree/-/rollup-dependency-tree-0.0.11.tgz",
-      "integrity": "sha512-g+mY+9ayok0FKAzFxS9GxX6cSWOFNPYu8H37i32+dsz7tb1SYaGawzsBl1qfLBKaL2WjwowmZ72BhdybZDx79Q==",
-      "dev": true
-    },
    "rollup-plugin-svelte": {
      "version": "6.0.0",
      "resolved": "https://registry.npmjs.org/rollup-plugin-svelte/-/rollup-plugin-svelte-6.0.0.tgz",
@ -3603,26 +3597,16 @@
      }
    },
    "sapper": {
-      "version": "0.28.5",
-      "resolved": "https://registry.npmjs.org/sapper/-/sapper-0.28.5.tgz",
-      "integrity": "sha512-pR+HZ3no95VoYfzMWv3nVZQY7vwJXF4C/vTnqMDuu7iVPm8X03pKHoXLRJZ1bREeey6Xteq7Et3RbPeXKfg5Fg==",
+      "version": "0.27.16",
+      "resolved": "https://registry.npmjs.org/sapper/-/sapper-0.27.16.tgz",
+      "integrity": "sha512-q8dohkbhga6xO+0a8h84odFyoilQ0D0vJtF8NHra/DQmSeN2R2MXUfwhw3EyvLms3T1x8H3v+qw642Qf5JXA9g==",
      "dev": true,
      "requires": {
        "html-minifier": "^4.0.0",
        "http-link-header": "^1.0.2",
-        "rollup-dependency-tree": "0.0.11",
        "shimport": "^1.0.1",
-        "source-map": "^0.6.1",
        "sourcemap-codec": "^1.4.6",
        "string-hash": "^1.1.3"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.6.1",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
-        }
      }
    },
    "sax": {
--- a/site/package.json
+++ b/site/package.json
@ -6,7 +6,7 @@
    "dev": "npm run copy-workers && sapper dev",
    "copy-workers": "node scripts/copy-workers.js",
    "migrate": "node-pg-migrate -r dotenv/config",
-    "sapper": "npm run copy-workers && sapper build --legacy",
+    "build": "npm run copy-workers && sapper build --legacy",
    "update": "node scripts/update_template.js && node scripts/get-contributors.js && node scripts/update_whos_using.js",
    "start": "node __sapper__/build",
    "test": "mocha -r esm test/**",
@ -41,20 +41,20 @@
    "@rollup/plugin-node-resolve": "^9.0.0",
    "@rollup/plugin-replace": "^2.2.0",
    "@sindresorhus/slugify": "^0.9.1",
-    "@sveltejs/site-kit": "^1.2.4",
+    "@sveltejs/site-kit": "^1.2.5",
    "@sveltejs/svelte-repl": "^0.2.1",
    "degit": "^2.1.4",
    "dotenv": "^8.1.0",
    "esm": "^3.2.25",
    "jimp": "^0.8.0",
    "mocha": "^6.2.0",
-    "node-fetch": "^2.6.0",
+    "node-fetch": "^2.6.1",
    "node-pg-migrate": "^3.22.0",
    "npm-run-all": "^4.1.5",
    "rollup": "^2.26.10",
    "rollup-plugin-svelte": "^6.0.0",
    "rollup-plugin-terser": "^7.0.0",
-    "sapper": "^0.28.5",
+    "sapper": "^0.27.16",
    "shelljs": "^0.8.3",
    "svelte": "^3.12.0"
  },
--- a/site/src/routes/_layout.svelte
+++ b/site/src/routes/_layout.svelte
@ -62,7 +62,6 @@

 <style>
 	main {
-		height: 100%;
 		position: relative;
 		margin: 0 auto;
 		/* padding: var(--nav-h) var(--side-nav) 0 var(--side-nav); */
--- a/site/src/routes/repl/[id]/index.svelte
+++ b/site/src/routes/repl/[id]/index.svelte
@ -117,7 +117,7 @@
 <style>
 	.repl-outer {
 		position: relative;
-		height: 100%;
+		height: calc(100vh - var(--nav-h));
 		--app-controls-h: 5.6rem;
 		--pane-controls-h: 4.2rem;
 		overflow: hidden;
--- a/src/compiler/compile/Component.ts
+++ b/src/compiler/compile/Component.ts
@ -947,12 +947,6 @@ export default class Component {
 							const variable = component.var_lookup.get(name);

 							if (variable.export_name && variable.writable) {
-								const insert = variable.subscribable
-									? get_insert(variable)
-									: null;
-
-								parent[key].splice(index + 1, 0, insert);
-
 								declarator.id = {
 									type: 'ObjectPattern',
 									properties: [{
@ -973,7 +967,9 @@ export default class Component {
 								};

 								declarator.init = x`$$props`;
-							} else if (variable.subscribable) {
+							}
+
+							if (variable.subscribable && declarator.init) {
 								const insert = get_insert(variable);
 								parent[key].splice(index + 1, 0, ...insert);
 							}
--- a/src/compiler/compile/css/Selector.ts
+++ b/src/compiler/compile/css/Selector.ts
@ -11,6 +11,10 @@ enum BlockAppliesToNode {
 	UnknownSelectorType
 }

+const whitelist_attribute_selector = new Map([
+	['details', new Set(['open'])]
+]);
+
 export default class Selector {
 	node: CssNode;
 	stylesheet: Stylesheet;
@ -65,9 +69,8 @@ export default class Selector {

 	transform(code: MagicString, attr: string, max_amount_class_specificity_increased: number) {
 		const amount_class_specificity_to_increase = max_amount_class_specificity_increased - this.blocks.filter(block => block.should_encapsulate).length;
-		attr = attr.repeat(amount_class_specificity_to_increase + 1);

-		function encapsulate_block(block: Block) {
+		function encapsulate_block(block: Block, attr: string) {
 			let i = block.selectors.length;

 			while (i--) {
@ -89,15 +92,14 @@ export default class Selector {
 			}
 		}

-		this.blocks.forEach((block) => {
+		this.blocks.forEach((block, index) => {
 			if (block.global) {
 				const selector = block.selectors[0];
 				const first = selector.children[0];
 				const last = selector.children[selector.children.length - 1];
 				code.remove(selector.start, first.start).remove(last.end, selector.end);
 			}
-
-			if (block.should_encapsulate) encapsulate_block(block);
+			if (block.should_encapsulate) encapsulate_block(block, index === this.blocks.length - 1 ? attr.repeat(amount_class_specificity_to_increase + 1) : attr);
 		});
 	}

@ -152,7 +154,7 @@ function apply_selector(blocks: Block[], node: Element, stack: Element[], to_enc
 	if (!block) return false;

 	if (!node) {
-		return blocks.every(block => block.global);
+		return block.global && blocks.every(block => block.global);
 	}

 	switch (block_might_apply_to_node(block, node)) {
@ -208,7 +210,7 @@ function apply_selector(blocks: Block[], node: Element, stack: Element[], to_enc
 	return true;
 }

-function block_might_apply_to_node(block, node): BlockAppliesToNode {
+function block_might_apply_to_node(block: Block, node: Element): BlockAppliesToNode {
 	let i = block.selectors.length;

 	while (i--) {
@ -234,7 +236,11 @@ function block_might_apply_to_node(block, node): BlockAppliesToNode {
 		}

 		else if (selector.type === 'AttributeSelector') {
-			if (!attribute_matches(node, selector.name.name, selector.value && unquote(selector.value), selector.matcher, selector.flags)) return BlockAppliesToNode.NotPossible;
+			if (
+				!(whitelist_attribute_selector.has(node.name.toLowerCase()) && whitelist_attribute_selector.get(node.name.toLowerCase()).has(selector.name.name.toLowerCase())) &&
+				!attribute_matches(node, selector.name.name, selector.value && unquote(selector.value), selector.matcher, selector.flags)) {
+				return BlockAppliesToNode.NotPossible;
+			}
 		}

 		else if (selector.type === 'TypeSelector') {
--- a/src/compiler/compile/nodes/Transition.ts
+++ b/src/compiler/compile/nodes/Transition.ts
@ -34,7 +34,7 @@ export default class Transition extends Node {
 		}

 		this.expression = info.expression
-			? new Expression(component, this, scope, info.expression, true)
+			? new Expression(component, this, scope, info.expression)
 			: null;
 	}
 }
--- a/src/compiler/compile/nodes/shared/Expression.ts
+++ b/src/compiler/compile/nodes/shared/Expression.ts
@ -64,6 +64,8 @@ export default class Expression {
 			enter(node: any, parent: any, key: string) {
 				// don't manipulate shorthand props twice
 				if (key === 'value' && parent.shorthand) return;
+				// don't manipulate `import.meta`, `new.target`
+				if (node.type === 'MetaProperty') return this.skip();

 				if (map.has(node)) {
 					scope = map.get(node);
--- a/src/compiler/compile/render_dom/Renderer.ts
+++ b/src/compiler/compile/render_dom/Renderer.ts
@ -166,12 +166,14 @@ export default class Renderer {
 		return member;
 	}

-	invalidate(name: string, value?) {
+	invalidate(name: string, value?, main_execution_context: boolean = false) {
 		const variable = this.component.var_lookup.get(name);
 		const member = this.context_lookup.get(name);

 		if (variable && (variable.subscribable && (variable.reassigned || variable.export_name))) {
-			return x`${`$$subscribe_${name}`}($$invalidate(${member.index}, ${value || name}))`;
+			return main_execution_context
+			  ? x`${`$$subscribe_${name}`}(${value || name})`
+			  : x`${`$$subscribe_${name}`}($$invalidate(${member.index}, ${value || name}))`;
 		}

 		if (name[0] === '$' && name[1] !== '$') {
--- a/src/compiler/compile/render_dom/invalidate.ts
+++ b/src/compiler/compile/render_dom/invalidate.ts
@ -31,10 +31,9 @@ export function invalidate(renderer: Renderer, scope: Scope, node: Node, names:

 	function get_invalidated(variable: Var, node?: Expression) {
 		if (main_execution_context && !variable.subscribable && variable.name[0] !== '$') {
-			return node || x`${variable.name}`;
+			return node;
 		}
-
-		return renderer.invalidate(variable.name);
+		return renderer.invalidate(variable.name, undefined, main_execution_context);
 	}

 	if (head) {
@ -44,12 +43,15 @@ export function invalidate(renderer: Renderer, scope: Scope, node: Node, names:
 			return get_invalidated(head, node);
 		} else {
 			const is_store_value = head.name[0] === '$' && head.name[1] !== '$';
-			const extra_args = tail.map(variable => get_invalidated(variable));
+			const extra_args = tail.map(variable => get_invalidated(variable)).filter(Boolean);

 			const pass_value = (
-				extra_args.length > 0 ||
-				(node.type === 'AssignmentExpression' && node.left.type !== 'Identifier') ||
-				(node.type === 'UpdateExpression' && (!node.prefix || node.argument.type !== 'Identifier'))
+				!main_execution_context && 
+				(
+					extra_args.length > 0 ||
+					(node.type === 'AssignmentExpression' && node.left.type !== 'Identifier') ||
+					(node.type === 'UpdateExpression' && (!node.prefix || node.argument.type !== 'Identifier'))
+				)
 			);

 			if (pass_value) {
@ -60,10 +62,12 @@ export function invalidate(renderer: Renderer, scope: Scope, node: Node, names:
 			}

 			let invalidate = is_store_value
-				? x`@set_store_value(${head.name.slice(1)}, ${node}, ${extra_args})`
+				? x`@set_store_value(${head.name.slice(1)}, ${node}, ${head.name})`
 				: !main_execution_context
 					? x`$$invalidate(${renderer.context_lookup.get(head.name).index}, ${node}, ${extra_args})`
-					: node;
+					: extra_args.length
+						? [node, ...extra_args]
+						: node;

 			if (head.subscribable && head.reassigned) {
 				const subscribe = `$$subscribe_${head.name}`;
--- a/src/compiler/compile/render_dom/wrappers/Element/index.ts
+++ b/src/compiler/compile/render_dom/wrappers/Element/index.ts
@ -868,6 +868,10 @@ export default class ElementWrapper extends Wrapper {
 				block.chunks.destroy.push(b`if (detaching && ${outro_name}) ${outro_name}.end();`);
 			}
 		}
+
+		if ((intro && intro.expression && intro.expression.dependencies.size) || (outro && outro.expression && outro.expression.dependencies.size)) {
+			block.maintain_context = true;
+		}
 	}

 	add_animation(block: Block) {
@ -997,12 +1001,14 @@ function to_html(wrappers: Array<ElementWrapper | TextWrapper | MustacheTagWrapp
 				state.quasi.value.raw += `"`;
 			});

-			state.quasi.value.raw += '>';
-
 			if (!wrapper.void) {
+				state.quasi.value.raw += '>';
+
 				to_html(wrapper.fragment.nodes as Array<ElementWrapper | TextWrapper>, block, literal, state);

 				state.quasi.value.raw += `</${wrapper.node.name}>`;
+			} else {
+				state.quasi.value.raw += '/>';
 			}
 		}
 	});
--- a/src/compiler/compile/render_dom/wrappers/shared/add_actions.ts
+++ b/src/compiler/compile/render_dom/wrappers/shared/add_actions.ts
@ -26,11 +26,19 @@ export function add_action(block: Block, target: string, action: Action) {

 	block.add_variable(id);

-	const fn = block.renderer.reference(action.name);
+	const [obj, ...properties] = action.name.split('.');

-	block.event_listeners.push(
-		x`@action_destroyer(${id} = ${fn}.call(null, ${target}, ${snippet}))`
-	);
+	const fn = block.renderer.reference(obj);
+
+	if (properties.length) {
+		block.event_listeners.push(
+			x`@action_destroyer(${id} = ${fn}.${properties.join('.')}(${target}, ${snippet}))`
+		);
+	} else {
+		block.event_listeners.push(
+			x`@action_destroyer(${id} = ${fn}.call(null, ${target}, ${snippet}))`
+		);
+	}

 	if (dependencies && dependencies.length > 0) {
 		let condition = x`${id} && @is_function(${id}.update)`;
--- a/src/compiler/compile/render_dom/wrappers/shared/is_dynamic.ts
+++ b/src/compiler/compile/render_dom/wrappers/shared/is_dynamic.ts
@ -1,9 +1,11 @@
 import { Var } from '../../../../interfaces';
+import { is_reserved_keyword } from '../../../utils/reserved_keywords';

 export default function is_dynamic(variable: Var) {
 	if (variable) {
 		if (variable.mutated || variable.reassigned) return true; // dynamic internal state
 		if (!variable.module && variable.writable && variable.export_name) return true; // writable props
+		if (is_reserved_keyword(variable.name)) return true;
 	}

 	return false;
--- a/src/compiler/parse/acorn.ts
+++ b/src/compiler/parse/acorn.ts
@ -3,11 +3,12 @@ import * as code_red from 'code-red';

 export const parse = (source: string): Node => code_red.parse(source, {
 	sourceType: 'module',
-	ecmaVersion: 11,
+	ecmaVersion: 12,
 	locations: true
 });

 export const parse_expression_at = (source: string, index: number): Node => code_red.parseExpressionAt(source, index, {
-	ecmaVersion: 11,
+	sourceType: 'module',
+	ecmaVersion: 12,
 	locations: true
 });
--- a/src/runtime/internal/await_block.ts
+++ b/src/runtime/internal/await_block.ts
@ -59,12 +59,12 @@ export function handle_promise(promise, info) {
 			update(info.then, 1, info.value, value);
 			set_current_component(null);
 		}, error => {
-			if (!info.hasCatch) {
-				throw error;
-			}
 			set_current_component(current_component);
 			update(info.catch, 2, info.error, error);
 			set_current_component(null);
+			if (!info.hasCatch) {
+				throw error;
+			}
 		});

 		// if we previously had a then/catch block, destroy it
--- a/src/runtime/internal/dom.ts
+++ b/src/runtime/internal/dom.ts
@ -138,7 +138,7 @@ export function get_binding_group_value(group, __value, checked) {
 }

 export function to_number(value) {
-	return value === '' ? undefined : +value;
+	return value === '' ? null : +value;
 }

 export function time_ranges_to_array(ranges) {
--- a/src/runtime/internal/scheduler.ts
+++ b/src/runtime/internal/scheduler.ts
@ -45,6 +45,7 @@ export function flush() {
 			set_current_component(component);
 			update(component.$$);
 		}
+		set_current_component(null);

 		dirty_components.length = 0;

--- a/test/css/samples/attribute-selector-details-open/expected.css
+++ b/test/css/samples/attribute-selector-details-open/expected.css
@ -0,0 +1 @@
+details[open].svelte-xyz{color:red}
--- a/test/css/samples/attribute-selector-details-open/input.svelte
+++ b/test/css/samples/attribute-selector-details-open/input.svelte
@ -0,0 +1,7 @@
+<details>Hello</details>
+
+<style>
+	details[open] {
+		color: red;
+	}
+</style>
--- a/test/css/samples/child-combinator/expected.css
+++ b/test/css/samples/child-combinator/expected.css
@ -0,0 +1 @@
+main.svelte-xyz button.svelte-xyz.svelte-xyz{background-color:red}main.svelte-xyz div.svelte-xyz>button.svelte-xyz{background-color:blue}
--- a/test/css/samples/child-combinator/input.svelte
+++ b/test/css/samples/child-combinator/input.svelte
@ -0,0 +1,14 @@
+<style>
+  main button {
+    background-color: red;
+  }
+
+  main div > button {
+    background-color: blue;
+  }
+</style>
+<main>
+  <div>
+    <button type="submit">Blue</button>
+  </div>
+</main>
--- a/test/css/samples/unused-selector-child-combinator/_config.js
+++ b/test/css/samples/unused-selector-child-combinator/_config.js
@ -0,0 +1,45 @@
+export default {
+	warnings: [
+		{
+			code: "css-unused-selector",
+			message: 'Unused CSS selector "article > *"',
+			frame: `
+			1: <style>
+			2:   article > * {
+			     ^
+			3:     font-size: 36px;
+			4:   }`,
+			pos: 10,
+			start: { character: 10, column: 1, line: 2 },
+			end: { character: 21, column: 12, line: 2 }
+		},
+		{
+			code: "css-unused-selector",
+			message: 'Unused CSS selector "article *"',
+			frame: `
+			4:   }
+			5:
+			6:   article * {
+			     ^
+			7:     font-size: 36px;
+			8:   }`,
+			pos: 49,
+			start: { character: 49, column: 1, line: 6 },
+			end: { character: 58, column: 10, line: 6 }
+		},
+		{
+			code: "css-unused-selector",
+			message: 'Unused CSS selector ".article > *"',
+			frame: `
+			 8:   }
+			 9:
+			10:   .article > * {
+			      ^
+			11:     font-size: 48px;
+			12:   }`,
+			pos: 86,
+			start: { character: 86, column: 1, line: 10 },
+			end: { character: 98, column: 13, line: 10 }
+		}
+	]
+};
--- a/test/css/samples/unused-selector-child-combinator/expected.css
+++ b/test/css/samples/unused-selector-child-combinator/expected.css
@ -0,0 +1 @@
+div.svelte-xyz>.svelte-xyz{color:orange}
--- a/test/css/samples/unused-selector-child-combinator/input.svelte
+++ b/test/css/samples/unused-selector-child-combinator/input.svelte
@ -0,0 +1,23 @@
+<style>	
+	article > * {
+		font-size: 36px;
+  }
+
+	article * {
+		font-size: 36px;
+	}
+	
+	.article > * {
+		font-size: 48px;
+	}
+	
+	div > * {
+		color: orange;
+	}
+</style>
+
+<div>
+	<p>
+		Svelte REPLs are svelte.
+	</p>
+</div>
--- a/test/js/samples/import-meta/expected.js
+++ b/test/js/samples/import-meta/expected.js
@ -0,0 +1,53 @@
+/* generated by Svelte vX.Y.Z */
+import {
+	SvelteComponent,
+	detach,
+	init,
+	insert,
+	noop,
+	safe_not_equal,
+	space,
+	text
+} from "svelte/internal";
+
+function create_fragment(ctx) {
+	let t0;
+	let t1;
+	let t2_value = import.meta.url + "";
+	let t2;
+
+	return {
+		c() {
+			t0 = text(/*url*/ ctx[0]);
+			t1 = space();
+			t2 = text(t2_value);
+		},
+		m(target, anchor) {
+			insert(target, t0, anchor);
+			insert(target, t1, anchor);
+			insert(target, t2, anchor);
+		},
+		p: noop,
+		i: noop,
+		o: noop,
+		d(detaching) {
+			if (detaching) detach(t0);
+			if (detaching) detach(t1);
+			if (detaching) detach(t2);
+		}
+	};
+}
+
+function instance($$self) {
+	const url = import.meta.url;
+	return [url];
+}
+
+class Component extends SvelteComponent {
+	constructor(options) {
+		super();
+		init(this, options, instance, create_fragment, safe_not_equal, {});
+	}
+}
+
+export default Component;
--- a/test/js/samples/import-meta/input.svelte
+++ b/test/js/samples/import-meta/input.svelte
@ -0,0 +1,6 @@
+<script>
+	const url = import.meta.url;
+</script>
+
+{url}
+{import.meta.url}
--- a/test/js/samples/valid-inner-html-for-static-element/expected.js
+++ b/test/js/samples/valid-inner-html-for-static-element/expected.js
@ -0,0 +1,39 @@
+/* generated by Svelte vX.Y.Z */
+import {
+	SvelteComponent,
+	detach,
+	element,
+	init,
+	insert,
+	noop,
+	safe_not_equal
+} from "svelte/internal";
+
+function create_fragment(ctx) {
+	let div;
+
+	return {
+		c() {
+			div = element("div");
+			div.innerHTML = `<img alt="Star" width="100" height="100" src="http://mdn.mozillademos.org/files/12676/star.svg"/>`;
+		},
+		m(target, anchor) {
+			insert(target, div, anchor);
+		},
+		p: noop,
+		i: noop,
+		o: noop,
+		d(detaching) {
+			if (detaching) detach(div);
+		}
+	};
+}
+
+class Component extends SvelteComponent {
+	constructor(options) {
+		super();
+		init(this, options, null, create_fragment, safe_not_equal, {});
+	}
+}
+
+export default Component;
--- a/test/js/samples/valid-inner-html-for-static-element/input.svelte
+++ b/test/js/samples/valid-inner-html-for-static-element/input.svelte
@ -0,0 +1,3 @@
+<div>
+    <img alt="Star" width="100" height="100" src="http://mdn.mozillademos.org/files/12676/star.svg" />
+</div>
--- a/test/runtime/samples/action-object/_config.js
+++ b/test/runtime/samples/action-object/_config.js
@ -0,0 +1,8 @@
+export default {
+	html: `
+		<button>action</button>
+	`,
+	async test({ assert, target, window }) {
+		assert.equal(target.querySelector('button').foo, 'bar1337');
+	}
+};
--- a/test/runtime/samples/action-object/main.svelte
+++ b/test/runtime/samples/action-object/main.svelte
@ -0,0 +1,10 @@
+<script>
+	const obj = {
+		foo : "bar",
+		action(element, { leet }) {
+			element.foo = this.foo + leet;
+		},
+	}
+</script>
+
+<button use:obj.action={{ leet: 1337 }}>action</button>
--- a/test/runtime/samples/await-without-catch/_config.js
+++ b/test/runtime/samples/await-without-catch/_config.js
@ -39,6 +39,7 @@ export default {
 		})
 		.catch((err) => {
 			assert.equal(err.message, 'this error should be thrown');
+			assert.htmlEqual(target.innerHTML, '');
 		});
 	}
 };
--- a/test/runtime/samples/binding-input-number/_config.js
+++ b/test/runtime/samples/binding-input-number/_config.js
@ -35,14 +35,14 @@ export default {
 			<p>number 44</p>
 		`);

-		// empty string should be treated as undefined
+		// empty string should be treated as null
 		input.value = '';
 		await input.dispatchEvent(event);

-		assert.equal(component.count, undefined);
+		assert.equal(component.count, null);
 		assert.htmlEqual(target.innerHTML, `
 			<input type='number'>
-			<p>undefined undefined</p>
+			<p>object null</p>
 		`);
 	}
 };
--- a/test/runtime/samples/component-slot-fallback-6/Foo.svelte
+++ b/test/runtime/samples/component-slot-fallback-6/Foo.svelte
@ -0,0 +1 @@
+<slot />
--- a/test/runtime/samples/component-slot-fallback-6/Inner.svelte
+++ b/test/runtime/samples/component-slot-fallback-6/Inner.svelte
@ -0,0 +1,9 @@
+<script>
+	import Foo from './Foo.svelte';
+</script>
+
+<Foo>
+	<slot>
+		{JSON.stringify($$props)}
+	</slot>
+</Foo>
--- a/test/runtime/samples/component-slot-fallback-6/_config.js
+++ b/test/runtime/samples/component-slot-fallback-6/_config.js
@ -0,0 +1,18 @@
+// $$props reactivity in slot fallback
+export default {
+	html: `
+		<input>
+		{"value":""}
+	`,
+
+	async test({ assert, target, window }) {
+		const input = target.querySelector("input");
+		input.value = "abc";
+		await input.dispatchEvent(new window.Event('input'));
+
+		assert.htmlEqual(target.innerHTML, `
+			<input>
+			{"value":"abc"}
+		`);
+	}
+};
--- a/test/runtime/samples/component-slot-fallback-6/main.svelte
+++ b/test/runtime/samples/component-slot-fallback-6/main.svelte
@ -0,0 +1,8 @@
+<script>
+	import Inner from "./Inner.svelte";
+	let value = '';
+</script>
+
+<input bind:value />
+
+<Inner {value} />
--- a/test/runtime/samples/numeric-seperator/_config.js
+++ b/test/runtime/samples/numeric-seperator/_config.js
@ -0,0 +1,3 @@
+export default {
+	html: `2048 2048`
+};
--- a/test/runtime/samples/numeric-seperator/main.svelte
+++ b/test/runtime/samples/numeric-seperator/main.svelte
@ -0,0 +1,5 @@
+<script>
+	const num = 2_048;
+</script>
+
+{num} {2_048}
--- a/test/runtime/samples/onmount-get-current-component/_config.js
+++ b/test/runtime/samples/onmount-get-current-component/_config.js
@ -0,0 +1,4 @@
+export default {
+	skip_if_ssr: true,
+	html: `1`
+};
--- a/test/runtime/samples/onmount-get-current-component/main.svelte
+++ b/test/runtime/samples/onmount-get-current-component/main.svelte
@ -0,0 +1,16 @@
+<script>
+	import { onMount } from 'svelte';
+	import { get_current_component } from 'svelte/internal';
+
+	let gotException = 0;
+
+	onMount(() => {
+		try {
+			get_current_component();
+		} catch (error) {
+			gotException++;
+		}
+	});
+</script>
+
+{gotException}
--- a/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store/_config.js
+++ b/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store/_config.js
@ -0,0 +1,3 @@
+export default {
+	html: `<h1>2 2 xxx 5 6</h1>`
+};
--- a/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store/main.svelte
+++ b/test/runtime/samples/reactive-assignment-in-complex-declaration-with-store/main.svelte
@ -0,0 +1,16 @@
+<script>
+	import { writable } from 'svelte/store';
+
+	let eid = writable(1);
+	let foo;
+	let u;
+	let v;
+	let w;
+	[u, v, w] = [
+		{id: eid = writable(foo = 2), name: 'xxx'},
+		5,
+		writable(6)
+	];
+</script>
+
+<h1>{foo} {$eid} {u.name} {v} {$w}</h1>
--- a/test/runtime/samples/reactive-assignment-in-declaration/main.svelte
+++ b/test/runtime/samples/reactive-assignment-in-declaration/main.svelte
@ -1,6 +1,9 @@
 <script>
 	let foo;
 	let bar = (foo = 1);
+	function a() {
+		bar = (foo = 1);
+	}
 </script>

 <h1>{foo} {bar}</h1>
--- a/test/runtime/samples/reactive-assignment-in-for-loop-head/main.svelte
+++ b/test/runtime/samples/reactive-assignment-in-for-loop-head/main.svelte
@ -1,9 +1,14 @@
 <script>
-  let foo1;
-  let foo2;
-  for (let bar = (foo1 = 0); bar < 5; bar += 1) {
-    foo2 = foo1;
-  }
+	let foo1;
+	let foo2;
+	for (let bar = (foo1 = 0); bar < 5; bar += 1) {
+		foo2 = foo1;
+	}
+	function a() {
+		for (let bar = (foo1 = 0); bar < 5; bar += 1) {
+			foo2 = foo1;
+		}
+	}
 </script>

 <h1>{foo1} {foo2}</h1>
--- a/test/runtime/samples/store-assignment-updates-property/_config.js
+++ b/test/runtime/samples/store-assignment-updates-property/_config.js
@ -0,0 +1,32 @@
+export default {
+	html: `
+		<p>a: {"foo":3,"bar":2}</p>
+		<p>b: {"foo":3}</p>
+		<button></button>
+		<button></button>
+	`,
+	skip_if_ssr: true,
+
+	async test({ assert, component, target, window }) {
+		const [btn1, btn2] = target.querySelectorAll('button');
+		const click = new window.MouseEvent('click');
+
+		await btn1.dispatchEvent(click);
+
+		assert.htmlEqual(target.innerHTML, `
+			<p>a: {"foo":4,"bar":2}</p>
+			<p>b: {"foo":4,"baz":0}</p>
+			<button></button>
+			<button></button>
+		`);
+
+		await btn2.dispatchEvent(click);
+
+		assert.htmlEqual(target.innerHTML, `
+			<p>a: {"foo":5,"bar":2}</p>
+			<p>b: {"foo":5,"qux":0}</p>
+			<button></button>
+			<button></button>
+		`);
+	}
+};
--- a/test/runtime/samples/store-assignment-updates-property/main.svelte
+++ b/test/runtime/samples/store-assignment-updates-property/main.svelte
@ -0,0 +1,24 @@
+<script>
+	import { writable } from '../../../../store';
+
+	const a = writable({ foo: 1, bar: 2 });
+	$a.foo = 3;
+
+	const b = writable({ foo: 1, bar: 2 });
+	$b = { foo: 3 };
+
+	function update() {
+		$a.foo = $a.foo + 1;
+		$b = { foo: $b.foo + 1, qux: 0 };
+	}
+</script>
+
+<p>a: {JSON.stringify($a)}</p>
+<p>b: {JSON.stringify($b)}</p>
+
+<button on:click={() => {
+	$a.foo = $a.foo + 1;
+	$b = { foo: $b.foo + 1, baz: 0 };
+}} />
+
+<button on:click={update} />
--- a/test/runtime/samples/store-resubscribe-c/_config.js
+++ b/test/runtime/samples/store-resubscribe-c/_config.js
@ -0,0 +1,3 @@
+export default {
+	html: `31 42`
+};
--- a/test/runtime/samples/store-resubscribe-c/main.svelte
+++ b/test/runtime/samples/store-resubscribe-c/main.svelte
@ -0,0 +1,16 @@
+<script>
+	import { writable } from 'svelte/store';
+	const context = {
+		store1: writable(31),
+		store2: writable(42)
+	};
+	let store1;
+	let store2;
+	({
+		store1,
+		store2
+	} = context);
+</script>
+
+{$store1}
+{$store2}
--- a/test/runtime/samples/transition-js-args-dynamic/_config.js
+++ b/test/runtime/samples/transition-js-args-dynamic/_config.js
@ -0,0 +1,15 @@
+export default {
+	test({ assert, component, target, window, raf }) {
+		component.visible = true;
+
+		const div = target.querySelector('div');
+
+		assert.equal(div.value, 0);
+
+		raf.tick(200);
+
+		div.value = 'test';
+		component.visible = false;
+		assert.equal(div.value, 'test');
+	}
+};
--- a/test/runtime/samples/transition-js-args-dynamic/main.svelte
+++ b/test/runtime/samples/transition-js-args-dynamic/main.svelte
@ -0,0 +1,17 @@
+<script>
+	export let visible = false;
+	export let value = 0;
+
+	function foo(node, params) {
+		return {
+			duration: 100,
+			tick: () => {
+				node.value = value;
+			}
+		};
+	}
+</script>
+
+{#if visible}
+	<div transition:foo={{value}}></div>
+{/if}
--- a/test/validator/samples/import-meta/errors.json
+++ b/test/validator/samples/import-meta/errors.json
@ -0,0 +1 @@
+[]
--- a/test/validator/samples/import-meta/input.svelte
+++ b/test/validator/samples/import-meta/input.svelte
@ -0,0 +1,6 @@
+<script>
+	const url = import.meta.url;
+</script>
+
+{url}
+{import.meta.url}
				`@ -0,0 +1 @@`
				`main.svelte-xyz button.svelte-xyz.svelte-xyz{background-color:red}main.svelte-xyz div.svelte-xyz>button.svelte-xyz{background-color:blue}`