From 7cedc5beefeb93b47404b39a1cd777dbca2d1530 Mon Sep 17 00:00:00 2001 From: zevav Date: Fri, 6 Dec 2019 14:21:44 +0100 Subject: [PATCH] first --- app/.gitignore | 3 + app/README.md | 93 ++ app/notes2.md | 51 + app/package-lock.json | 2254 ++++++++++++++++++++++++++++++++++++++++ app/package.json | 21 + app/public/favicon.png | Bin 0 -> 3127 bytes app/public/global.css | 66 ++ app/public/index.html | 18 + app/rollup.config.js | 71 ++ app/src/App.svelte | 32 + app/src/main.js | 11 + notes.md | 670 ++++++++++++ 12 files changed, 3290 insertions(+) create mode 100644 app/.gitignore create mode 100644 app/README.md create mode 100644 app/notes2.md create mode 100644 app/package-lock.json create mode 100644 app/package.json create mode 100644 app/public/favicon.png create mode 100644 app/public/global.css create mode 100644 app/public/index.html create mode 100644 app/rollup.config.js create mode 100644 app/src/App.svelte create mode 100644 app/src/main.js create mode 100644 notes.md diff --git a/app/.gitignore b/app/.gitignore new file mode 100644 index 0000000..dc214b2 --- /dev/null +++ b/app/.gitignore @@ -0,0 +1,3 @@ +.DS_Store +node_modules +public/build diff --git a/app/README.md b/app/README.md new file mode 100644 index 0000000..c740b88 --- /dev/null +++ b/app/README.md @@ -0,0 +1,93 @@ +*Psst — looking for a shareable component template? Go here --> [sveltejs/component-template](https://github.com/sveltejs/component-template)* + +--- + +# svelte app + +This is a project template for [Svelte](https://svelte.dev) apps. It lives at https://github.com/sveltejs/template. + +To create a new project based on this template using [degit](https://github.com/Rich-Harris/degit): + +```bash +npx degit sveltejs/template svelte-app +cd svelte-app +``` + +*Note that you will need to have [Node.js](https://nodejs.org) installed.* + + +## Get started + +Install the dependencies... + +```bash +cd svelte-app +npm install +``` + +...then start [Rollup](https://rollupjs.org): + +```bash +npm run dev +``` + +Navigate to [localhost:5000](http://localhost:5000). You should see your app running. Edit a component file in `src`, save it, and reload the page to see your changes. + +By default, the server will only respond to requests from localhost. To allow connections from other computers, edit the `sirv` commands in package.json to include the option `--host 0.0.0.0`. + + +## Building and running in production mode + +To create an optimised version of the app: + +```bash +npm run build +``` + +You can run the newly built app with `npm run start`. This uses [sirv](https://github.com/lukeed/sirv), which is included in your package.json's `dependencies` so that the app will work when you deploy to platforms like [Heroku](https://heroku.com). + + +## Single-page app mode + +By default, sirv will only respond to requests that match files in `public`. This is to maximise compatibility with static fileservers, allowing you to deploy your app anywhere. + +If you're building a single-page app (SPA) with multiple routes, sirv needs to be able to respond to requests for *any* path. You can make it so by editing the `"start"` command in package.json: + +```js +"start": "sirv public --single" +``` + + +## Deploying to the web + +### With [now](https://zeit.co/now) + +Install `now` if you haven't already: + +```bash +npm install -g now +``` + +Then, from within your project folder: + +```bash +cd public +now deploy --name my-project +``` + +As an alternative, use the [Now desktop client](https://zeit.co/download) and simply drag the unzipped project folder to the taskbar icon. + +### With [surge](https://surge.sh/) + +Install `surge` if you haven't already: + +```bash +npm install -g surge +``` + +Then, from within your project folder: + +```bash +npm run build +surge public my-project.surge.sh +``` diff --git a/app/notes2.md b/app/notes2.md new file mode 100644 index 0000000..7b65cce --- /dev/null +++ b/app/notes2.md @@ -0,0 +1,51 @@ +# How Does Svelte Actually Work? part 2 + +[Here's part 1](https://dev.to/zev/how-does-svelte-actually-work-part-1-j9m), but the summary below might be enough to catch you up. + +# Episode Recap + +On the previous episode of HDSAW we took a bewildering ride through the 400 or so lines of vanilla JavaScript the Svelte compiler produces from [the sample app](https://github.com/sveltejs/template). Here's [that vanilla JS](https://gist.github.com/zevaverbach/83901aed1230fbd3adb01b96a7be0572) for your perusal, and see below for an updated version for part 2. + +## What We've Learned So Far + +When we run `npm run dev` to compile the sample app, Rollup takes the contents of `main.js` and runs the Svelte compiler on it. This produces a file called `bundle.js` in the `src` directory. + +`bundle.js` defines and immediately calls an anonymous function, creating an instance of `App` called `app`. The code which runs inside the constructor of `App` first renders the Svelte app, then binds a small handful of methods to the instance. These methods can be used to get and set the state of the app, including by the user at the console! + +## Outstanding Questions + +1) Is it a security problem that the user can directly manipulate the state from a browser's JavaScript console? +2) What is the difference between `app.$set` and `app.$inject_state`, if any? +3) How does `bundle.js` change with increasing app complexity? Multiple components, for example, or dynamically re-rendering props/state. +4) What is `__svelte_meta` for? +5) Where and when does `mount` actually get called? +6) Can `dirty` ever contain anything besides a single integer? In other words, are elements updated one after the next, or can `update` sometimes operate on more than one element at a run? +7) When are components and elements destroyed? Are Svelte and Rollup as efficient about unnecessary re-renders as billed? +8) How does all this fit together? Asked another way, is it possible to have a basic understanding of how a web framework we use actually works? + +We'll try to get through a few of these today. + +# A Skinnier Bundle + +You see what I did there? This time around we're going to generate the `build.js` using `npm run build`, so as to not distract ourselves with the events that get emitted in dev mode. First, though, let's tell Rollup not to minify that file so we can actually read it: + +```js +// ./rollup.config.js +... + // In dev mode, call `npm run start` once + // the bundle has been generated + !production && serve(), + + // Watch the `public` directory and refresh the + // browser on changes when not in production + !production && livereload('public'), + + // If we're building for production (npm run build + // instead of npm run dev), minify + // production && terser() 👈👈👈 comment this out + ], + watch: { +... +``` + +`npm run build` produces this _really quite svelte_ code, which is now only about 300 lines!: diff --git a/app/package-lock.json b/app/package-lock.json new file mode 100644 index 0000000..d5808ae --- /dev/null +++ b/app/package-lock.json @@ -0,0 +1,2254 @@ +{ + "name": "svelte-app", + "version": "1.0.0", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "@babel/code-frame": { + "version": "7.5.5", + "resolved": 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+import svelte from 'rollup-plugin-svelte'; +import resolve from 'rollup-plugin-node-resolve'; +import commonjs from 'rollup-plugin-commonjs'; +import livereload from 'rollup-plugin-livereload'; +import { terser } from 'rollup-plugin-terser'; + +const production = !process.env.ROLLUP_WATCH; + +export default { + input: 'src/main.js', + output: { + sourcemap: true, + format: 'iife', + name: 'app', + file: 'public/build/bundle.js' + }, + plugins: [ + svelte({ + // enable run-time checks when not in production + dev: !production, + // we'll extract any component CSS out into + // a separate file — better for performance + css: css => { + css.write('public/build/bundle.css'); + } + }), + + // If you have external dependencies installed from + // npm, you'll most likely need these plugins. In + // some cases you'll need additional configuration — + // consult the documentation for details: + // https://github.com/rollup/rollup-plugin-commonjs + resolve({ + browser: true, + dedupe: importee => importee === 'svelte' || importee.startsWith('svelte/') + }), + commonjs(), + + // In dev mode, call `npm run start` once + // the bundle has been generated + !production && serve(), + + // Watch the `public` directory and refresh the + // browser on changes when not in production + !production && livereload('public'), + + // If we're building for production (npm run build + // instead of npm run dev), minify + // production && terser() + ], + watch: { + clearScreen: false + } +}; + +function serve() { + let started = false; + + return { + writeBundle() { + if (!started) { + started = true; + + require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], { + stdio: ['ignore', 'inherit', 'inherit'], + shell: true + }); + } + } + }; +} diff --git a/app/src/App.svelte b/app/src/App.svelte new file mode 100644 index 0000000..4d02aff --- /dev/null +++ b/app/src/App.svelte @@ -0,0 +1,32 @@ + + +
+

Hello {name}!

+

Your lucky number is {number}.

+

Visit the Svelte tutorial to learn how to build Svelte apps.

+
+ + diff --git a/app/src/main.js b/app/src/main.js new file mode 100644 index 0000000..f32a355 --- /dev/null +++ b/app/src/main.js @@ -0,0 +1,11 @@ +import App from './App.svelte'; + +const app = new App({ + target: document.body, + props: { + name: 'Whirl', + number: 24 + } +}); + +export default app; diff --git a/notes.md b/notes.md new file mode 100644 index 0000000..056ed10 --- /dev/null +++ b/notes.md @@ -0,0 +1,670 @@ +--- +title: How Does Svelte Actually Work? part 1 +published: true +description: A conversational, thinking-out-loud tour of the JavaScript that Svelte outputs +tags: svelte +--- +A friend put Svelte on the map for me this summer. Rather than tout its performance relative to the frameworks of the day, he touted the bite-sizedness and readability of the JavaScript it generates when compiled. + +I'm writing a course that uses Svelte (and FastAPI and some other snazzy things) and am realizing that I could use some deeper knowledge of how Svelte operates: Specifically, how the code works that Svelte compiles to. + +I'll post my insights as they come about, so this is part 1 of `x`. + +# First Steps + +I used the template provided by the Svelte project by doing +`npx degit sveltejs/template my-svelte-project; cd $_; npm install`. + +Then I ran `npm run dev` to compile the included component and start the development server. + +This produced [`build/bundle.js`](https://gist.github.com/zevaverbach/83901aed1230fbd3adb01b96a7be0572), the beast we'll be dissecting. + +# Start at the Bottom + +```js +// build/bundle.js (all code blocks are from this file unless otherwise specified) +... +const app = new App({ + target: document.body, + props: { + name: 'world' + } +}); + +return app; + +}()); +//# sourceMappingURL=bundle.js.map +``` + +I didn't know what a source map is, but having Googled it and inspected `bundle.js.map` a little, I've decided not to try to decipher it just yet! + +Those parens at the end tell me that the `app` var on line 3 of `bundle.js` + +```js +... +var app = (function () { +... +``` + +stores the result of `return app`, as everything on the right-hand side of that 👆👆 `=` is an anonymous function which immediately calls itself. + +Then, the above block, starting with `const app`, is identical to the logic in `main.js`. + +```js +// src/main.js + +import App from './App.svelte'; + +const app = new App({ + target: document.body, + props: { + name: 'world', + } +}); + +export default app; +``` + +Searching for `main.js` in the Rollup config file that came with this sample app, I see + +```js +// rollup.config.js +... + input: 'src/main.js', +... +``` + +Okay, I'm reminded that this is where the Svelte app is defined, as configured in `rollup.config.js`. + +# The App: First Hypothesis + +It looks like the `App` class has `get` and `set` methods on it, each called `name`. + +```js +... +class App extends SvelteComponentDev { + constructor(options) { + super(options); + init(this, options, instance, create_fragment, safe_not_equal, { name: 0 }); + + dispatch_dev("SvelteRegisterComponent", { + component: this, + tagName: "App", + options, + id: create_fragment.name + }); + + const { ctx } = this.$$; + const props = options.props || ({}); + + if (/*name*/ ctx[0] === undefined && !("name" in props)) { + console.warn(" was created without expected prop 'name'"); + } + } + + get name() { + throw new Error(": Props cannot be read directly from the component instance unless compiling with 'accessors: true' or ''"); + } + + set name(value) { + throw new Error(": Props cannot be set directly on the component instance unless compiling with 'accessors: true' or ''"); + } +} + +... +``` + +I hypothesize that if I give `App` another prop, there will be a pair of `get` and `set` for that as well. + +## Testing Hypothesis #1 + +```html + + + + +``` + +Sure enough, these methods have appeared: + +```js +... +get name() { + throw new Error(": Props cannot be read directly from the component instance unless compiling with 'accessors: true' or ''"); +} + +set name(value) { + throw new Error(": Props cannot be set directly on the component instance unless compiling with 'accessors: true' or ''"); +} + +get number() { + throw new Error(": Props cannot be read directly from the component instance unless compiling with 'accessors: true' or ''"); +} + +set number(value) { + throw new Error(": Props cannot be set directly on the component instance unless compiling with 'accessors: true' or ''"); +} +... +``` + +So that's how that works. I don't know much about how getters/setters work in JS classes, but I'm guessing it's like in Python: They trigger when you try to get or set an instance attribute. + +Then there's this in the constructor of `App`: + +```js +if (/*name*/ ctx[0] === undefined && !("name" in props)) { + console.warn(" was created without expected prop 'name'"); +} + +if (/*number*/ ctx[1] === undefined && !("number" in props)) { + console.warn(" was created without expected prop 'number'"); +} +``` +This `ctx` thing is mysterious, and it's popped off of the even more mysterious `this.$$`. + +```js +class App extends SvelteComponentDev { + constructor(options) { + ... + const { ctx } = this.$$; +... +``` + +We'll come back to these. + +Before continuing, let's update `main.js` to provide a value for the `number` prop. + +```js +// src/main.js +... +const app = new App({ + target: document.body, + props: { + name: 'world', + number: 42 + } +}); +``` + +# Everything Starts in `create_fragment` + +```js +function create_fragment(ctx) { + let main; + let h1; + let t0; + let t1; + let t2; + let t3; + let p; + let t4; + let a; + let t6; + + const block = { + c: function create() { + main = element("main"); + h1 = element("h1"); + t0 = text("Hello "); + t1 = text(/*name*/ ctx[0]); + t2 = text("!"); + t3 = space(); + p = element("p"); + t4 = text("Visit the "); + a = element("a"); + a.textContent = "Svelte tutorial"; + t6 = text(" to learn how to build Svelte apps."); + attr_dev(h1, "class", "svelte-1tky8bj"); + add_location(h1, file, 5, 1, 46); + attr_dev(a, "href", "https://svelte.dev/tutorial"); + add_location(a, file, 6, 14, 83); + add_location(p, file, 6, 1, 70); + attr_dev(main, "class", "svelte-1tky8bj"); + add_location(main, file, 4, 0, 38); + }, + l: function claim(nodes) { + throw new Error("options.hydrate only works if the component was compiled with the `hydratable: true` option"); + }, + m: function mount(target, anchor) { + insert_dev(target, main, anchor); + append_dev(main, h1); + append_dev(h1, t0); + append_dev(h1, t1); + append_dev(h1, t2); + append_dev(main, t3); + append_dev(main, p); + append_dev(p, t4); + append_dev(p, a); + append_dev(p, t6); + }, + p: function update(ctx, [dirty]) { + if (dirty & /*name*/ 1) set_data_dev(t1, /*name*/ ctx[0]); + }, + i: noop, + o: noop, + d: function destroy(detaching) { + if (detaching) detach_dev(main); + } + }; + + dispatch_dev("SvelteRegisterBlock", { + block, + id: create_fragment.name, + type: "component", + source: "", + ctx + }); + + return block; +} + + + +``` + +`create_fragment` is a function that takes a single argument `ctx`, and its job is primarily to create and render DOM elements; it returns `block`. + +## `block` + +`block` is an object whose most important attributes are `c` (create), `m` (mount), `p` (update), `d` (destroy). + +### `c` (create) + +`block.c`'s value is a factory function called `create`, which + +```js + c: function create() { + main = element("main"); + h1 = element("h1"); + t0 = text("Hello "); + t1 = text(/*name*/ ctx[0]); + t2 = text("!"); + t3 = space(); + p = element("p"); + t4 = text("Visit the "); + a = element("a"); + a.textContent = "Svelte tutorial"; + t6 = text(" to learn how to build Svelte apps.") + ... +``` + +1) creates a bunch of DOM elements and text nodes +2) assigns them each to a variable declared at the start of `create_fragment` + +Then it + +```js + ... + attr_dev(h1, "class", "svelte-1tky8bj"); + add_location(h1, file, 5, 1, 46); + attr_dev(a, "href", "https://svelte.dev/tutorial"); + add_location(a, file, 6, 14, 83); + add_location(p, file, 6, 1, 70); + attr_dev(main, "class", "svelte-1tky8bj"); + add_location(main, file, 4, 0, 38); +} +``` + +3) sets attributes (like 'class' and 'href') on the elements +4) dispatches an event for each attribute-setting (more on that later: we can safely ignore these events forever). +5) adds metadata to each element (`__svelte_meta`) detailing exactly where it's defined in the `src` modules. + +### `m` (mount) + +`block.m`'s value is a factory function called `mount`, which, y'know, adds each element and text node to the DOM in the appropriate place. + +```js + m: function mount(target, anchor) { + insert_dev(target, main, anchor); + append_dev(main, h1); + append_dev(h1, t0); + append_dev(h1, t1); + append_dev(h1, t2); + append_dev(main, t3); + append_dev(main, p); + append_dev(p, t4); + append_dev(p, a); + append_dev(p, t6); + }, + +``` + +### `p` (update) + +`block.p`'s value is _not_ a factory function, but a plain old function which seems to + +```js + p: function update(ctx, [dirty]) { + if (dirty & /*name*/ 1) set_data_dev(t1, /*name*/ ctx[0]); + }, +``` + +1) do something with bits that I don't understand, but probably just checks whether there's anything to update (`dirty`) +2) if the new value (`ctx[0]`) differs from `t1`'s value (`undefined` by default), +3) update `t1`'s value -- it's a text node, as a reminder + +### Hypothesis #2 + +I notice here that the prop we added in the first hypothesis, `number`, doesn't appear in the `update` function. I'm thinking this is because it's not used anywhere in the component: It's an unused prop. + +#### Testing Hypothesis #2 + +```html + +... +
+

Hello {name}!

+

Your lucky number is {number}.

+

Visit the Svelte tutorial to learn how to build Svelte apps.

+
+... +``` + +```js +// build/bundle.js +... + p: function update(ctx, [dirty]) { + if (dirty & /*name*/ 1) set_data_dev(t1, /*name*/ ctx[0]); + if (dirty & /*number*/ 2) set_data_dev(t5, /*number*/ ctx[1]); + }, +... +``` + +Ding ding ding! I'm still not sure about this `if (dirty & 2)` business; we'll kick that can for now. + +### `d` (destroy) + +`block.d`'s value is a function which -- shock and awe -- removes an element from the DOM. + +```js + d: function destroy(detaching) { + if (detaching) detach_dev(main); +``` + +# Where is `block` consumed? + +`create_fragment` is only called once in `bundle.js`, which makes sleuthing pretty easy: + +```js + ... + $$.fragment = create_fragment ? create_fragment($$.ctx) : false; + ... +``` + +This is inside of the monster `init` function, which is itself called only in the constructor of the `class App` definition. What is this `create_fragment ? ...` ternary about? It seems like `create_fragment` will always be truthy, given that it... exists? The more fruitful question is probably where and how is `$$.fragment` used? Where? In three places, it turns out. How? + +## `init` + +```js +... + function init(component, options, instance, create_fragment, not_equal, props, dirty = [-1]) { + const parent_component = current_component; + set_current_component(component); + const prop_values = options.props || {}; + const $$ = component.$$ = { + fragment: null, + ctx: null, + // state + props, + update: noop, + not_equal, + bound: blank_object(), + // lifecycle + on_mount: [], + on_destroy: [], + before_update: [], + after_update: [], + context: new Map(parent_component ? parent_component.$$.context : []), + // everything else + callbacks: blank_object(), + dirty + }; + let ready = false; + $$.ctx = instance + ? instance(component, prop_values, (i, ret, value = ret) => { + if ($$.ctx && not_equal($$.ctx[i], $$.ctx[i] = value)) { + if ($$.bound[i]) + $$.bound[i](value); + if (ready) + make_dirty(component, i); + } + return ret; + }) + : []; + $$.update(); + ready = true; + run_all($$.before_update); + // `false` as a special case of no DOM component + $$.fragment = create_fragment ? create_fragment($$.ctx) : false; + if (options.target) { + if (options.hydrate) { + // eslint-disable-next-line @typescript-eslint/no-non-null-assertion + $$.fragment && $$.fragment.l(children(options.target)); + } + else { + // eslint-disable-next-line @typescript-eslint/no-non-null-assertion + $$.fragment && $$.fragment.c(); + } + if (options.intro) + transition_in(component.$$.fragment); + mount_component(component, options.target, options.anchor); + flush(); + } + set_current_component(parent_component); +} + +... +``` + +`$$.fragment` is referred to three times directly after its creation in `init`. Since only `target` is in the `options` of the sample app, we'll ignore all but the second, `$$.fragment && $$.fragment.c();`. Similar to the previous step, I don't understand the boolean check here of `$$.fragment && ...`, but what's notable is that `fragment`'s `c` method is called, which will create—but not mount—all the elements and text nodes, giving the elements metadata about their pre-compiled location in `App.svelte`. + +Since `init` is called inside the constructor of `App`, we know the above will be executed at runtime. + +### Backtracking: What About `$$`? + +Real quick: `$$` is defined early in `init`. + +```js +... + const $$ = component.$$ = { + fragment: null, + ctx: null, + // state + props, + update: noop, + not_equal, + bound: blank_object(), + // lifecycle + on_mount: [], + on_destroy: [], + before_update: [], + after_update: [], + context: new Map(parent_component ? parent_component.$$.context : []), + // everything else + callbacks: blank_object(), + dirty + }; +... + +``` +Mystery solved! + +## `update` + +```js + function update($$) { + if ($$.fragment !== null) { + $$.update(); + run_all($$.before_update); + $$.fragment && $$.fragment.p($$.ctx, $$.dirty); + $$.dirty = [-1]; + $$.after_update.forEach(add_render_callback); + } + } +``` + +We can ignore almost all of this. `$$.update` is assigned to `noop` which does nothing at all. We'll also assume `$$.fragment` isn't null (how could it be??). Then, `$$.before_update` is currently an empty array, so we'll wait for more app complexity before studying `run_all($$.before_update)`. Similarly, `$$.after_update.forEach(add_render_callback)` we can ignore because `$$.after_update` is also an empty array. + +That leaves only + +```js + $$.fragment && $$.fragment.p($$.ctx, $$.dirty); + $$.dirty = [-1]; +``` + +Looking around `bundle.js` I'm pretty confident that `$$.dirty = [-1]` means there are no pending changes to the app's state. This means that after updating the DOM in the line above it, `$$.fragment.p($$.ctx, $$.dirty)`, we're indicating that all necessary changes have been made. + +That makes the only action-packed line `$$.fragment.p($$.ctx, $$.dirty)`, to update the DOM with any changes to +`$$.ctx`. + +## `$$.ctx` + +`$$.ctx` seems to be where the app's state lives. Its calculation is a little complex: + +```js + $$.ctx = instance + ? instance(component, prop_values, (i, ret, value = ret) => { + if ($$.ctx && not_equal($$.ctx[i], $$.ctx[i] = value)) { + if ($$.bound[i]) + $$.bound[i](value); + if (ready) + make_dirty(component, i); + } + return ret; + }) +``` + +The `instance` function is what generates it: + +```js + function instance($$self, $$props, $$invalidate) { + let { name } = $$props; + let { number } = $$props; + const writable_props = ["name", "number"]; + + Object.keys($$props).forEach(key => { + if (!~writable_props.indexOf(key) && key.slice(0, 2) !== "$$") console.warn(` was created with unknown prop '${key}'`); + }); + + $$self.$set = $$props => { + if ("name" in $$props) $$invalidate(0, name = $$props.name); + if ("number" in $$props) $$invalidate(1, number = $$props.number); + }; + + $$self.$capture_state = () => { + return { name, number }; + }; + + $$self.$inject_state = $$props => { + if ("name" in $$props) $$invalidate(0, name = $$props.name); + if ("number" in $$props) $$invalidate(1, number = $$props.number); + }; + + return [name, number]; + } +``` + +`instance` destructures our props, `name` and `number`, and passes them right through, unchanged, to `$$.ctx`. + +Therefore, `$$.ctx` is equal to `["world", 42]`: Not as complex as I expected; we'll come back to all these side effects happening here between the seeming pass-through of props. + +As seen earlier, `$$.fragment.p($$.ctx, $$.dirty)` is calling this function: + +```js + function update(ctx, [dirty]) { + if (dirty & /*name*/ 1) set_data_dev(t1, /*name*/ ctx[0]); + if (dirty & /*number*/ 2) set_data_dev(t5, /*number*/ ctx[1]); + } +``` + +Okay, time to figure out what this `dirty & x` business is about. It seems like `dirty` contains indices of what elements need updating, but why not find out the specifics?: + +```js + p: function update(ctx, [dirty]) { + if (dirty & /*name*/ 1) { + console.log(`dirty 1 was dirty: ${dirty}`) + set_data_dev(t1, /*name*/ ctx[0]); + } else { + console.log(`dirty 1 wasn't dirty: ${dirty}`) + } + if (dirty & /*name*/ 2) { + console.log(`dirty 2 was dirty: ${dirty}`) + set_data_dev(t5, /*name*/ ctx[0]); + } else { + console.log(`dirty 2 wasn't dirty: ${dirty}`) + } + console.log(typeof dirty) + }, +``` + +In order to trigger `update` without building some UI, to trigger these informative `console.log`s, we need to manipulate the app's state manually: + +# `app` in Action + +Circling back to the `instance` function, the more meaningful work it performs (the "side effects") is in binding three methods—`$set`, `$capture_state`, and `$inject_state`—to `$$self`, which is `App`. + +Did I mention we can inspect our `App` instance, `app`, in the console? It's another lovely feature of Svelte: Since it compiles down to vanilla Javascript, `app` is in the global scope of a browser rendering it, without any special plugins or other somersaults! Armed with that knowledge, let's play with these new methods in the Javascript console: + +```js +>> app.$capture_state() + ► Object { name: "world", number: 42 } +>> app.$set({name: "Whirl"}) + undefined + dirty 1 was dirty: 1 + dirty 2 wasn't dirty: 1 + number +>> app.$capture_state() + ► Object { name: "Whirl", number: 42 } +>> app.$inject_state({number: 24}) + undefined + undefined + dirty 1 wasn't dirty: 2 + dirty 2 was dirty: 2 + number +>> app.$capture_state() + ► Object { name: "Whirl", number: 24 } +``` + +The page looks like this now: + +![A screenshot showing that the updated props have also changed in the rendered page.](https://thepracticaldev.s3.amazonaws.com/i/1cia44g9gwvtqb5l01qi.png) + +Several discoveries here: + +1) `$capture_state` gives the current state of the app as an object. +2) `$set` and `$inject_state` seem to both update the app's state via an object. +3) `dirty`, when it's not equal to `[-1]`, is a positive integer seemingly referring to the props by a 1-based index. +4) These props are updated in the rendered page. + +One more mystery to unravel: + +```js +>> app.name + Error: : Props cannot be read directly from the component instance unless compiling with 'accessors: true' or + '' +>> app.name = 'hi' + Error: : Props cannot be set directly on the component instance unless compiling with 'accessors: true' or + '< svelte:options accessors/>' +``` + +That's the purpose of the `set` and `get` methods from earlier: Enforce that the compiled code doesn't set and get props directly on the `App` instance, but that it uses... the included machinery? + +# Next Time + +Join us next time to unwrap the mysteries of + +1) What is the difference between `app.$set` and `app.$inject_state`, if any? +2) How does `bundle.js` change with increasing app complexity? Multiple components, for example, or dynamically re-rendering props/state. +3) What is `__svelte_meta` for? +4) Where and when does `mount` actually get called? +5) Can `dirty` ever contain anything besides a single integer? In other words, are elements updated one after the next, or can `update` sometimes operate on more than one element at a run? +6) When are components and elements destroyed? Are Svelte and Rollup as efficient about unnecessary re-renders as billed? +7) How does all this fit together? Asked another way, is it possible to have a basic understanding of how a web framework we use actually works? + +# Random Notes +[According to Svelte's tweet response to me](https://twitter.com/zevav/status/1202593636631941123), the events emitted at various points in `bundle.js` are strictly for dev tooling. This is why we can ignore them. +