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launch-source-map-explorer.js
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/* eslint-env node */
const path = require('path');
const getPort = require('get-port');
const chalk = require('chalk');
const express = require('express');
const {Compiler} = require('./build/compiler');
const spawn = require('./build/spawn');
const {
loadSourceMap,
computeGeneratedFileSizes,
} = require('source-map-explorer');
module.exports = function sourceMapExplorer({dir}) {
getPort().then(port => {
let data = null;
const connections = new Set();
process.env.PORT_HTTP = port;
const compiler = new Compiler({dir, envs: ['production'], watch: true});
compiler.on('done', multistats => {
const stat = multistats.stats.find(s => s.compilation.name === 'client');
const stats = stat.compilation.chunks.map(({files}) => {
const base = path.resolve(
process.cwd(),
'.fusion/dist/production/client'
);
const file = files.find(f => f.match(/\.js$/));
const js = path.resolve(base, file);
const map = path.resolve(base, files.find(f => f.match(/\.js.map$/)));
const {mapConsumer, jsData} = loadSourceMap(js, map);
return {
sizes: computeGeneratedFileSizes(mapConsumer, jsData),
chunk: file.replace(/-[^-]+\.js$/, '-[hash].js'),
};
});
data = stats;
for (const res of connections) {
res.write('data: ' + JSON.stringify(data) + '\n\n');
}
// eslint-disable-next-line no-console
console.log(
chalk.green(
'Hot reloading source map explorer running at http://localhost:9000'
)
);
});
compiler.start();
const app = express();
app.get('/', (req, res) => {
res.send(getHTML(data));
});
app.get('/_sse', (req, res) => {
res.writeHead(200, {
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
Connection: 'keep-alive',
});
connections.add(res);
req.connection.addListener('close', () => connections.delete(res));
});
app.listen(9000);
spawn(`open http://localhost:9000/#all`);
});
};
// code below is adapted from
// https://github.com/danvk/source-map-explorer/blob/df11ddc691d82dace0b6a1b2dee31831d8fef93b/index.js#L200
// and
// https://github.com/danvk/source-map-explorer/blob/df11ddc691d82dace0b6a1b2dee31831d8fef93b/tree-viz.html
function getHTML(data) {
return `
<!doctype html>
<head>
<meta charset="UTF-8">
<title>Source Map Explorer</title>
<style>
/* Vendored from https://github.com/rmmh/webtreemap/blob/9fa0c066a10ea4402d960b0c6c1a432846ac7fc4/webtreemap.css */
.webtreemap-node {
/* Required attributes. */
position: absolute;
overflow: hidden; /* To hide overlong captions. */
background: white; /* Nodes must be opaque for zIndex layering. */
border: solid 1px black; /* Calculations assume 1px border. */
/* Optional: CSS animation. */
transition: top 0.3s,
left 0.3s,
width 0.3s,
height 0.3s;
}
/* Optional: highlight nodes on mouseover. */
.webtreemap-node:hover {
background: #eee;
}
/* Optional: Different background colors depending on symbol. */
.webtreemap-symbol-bss {
background: #66C2A5;
}
.webtreemap-symbol-data {
background: #FC8D62;
}
.webtreemap-symbol-read-only_data {
background: #8DA0CB;
}
.webtreemap-symbol-code {
background: #E78AC3;
}
.webtreemap-symbol-weak_symbol {
background: #A6D854;
}
.webtreemap-symbol-bss.webtreemap-aggregate {
background: #B3E2CD;
}
.webtreemap-symbol-data.webtreemap-aggregate {
background: #FDCDAC;
}
.webtreemap-symbol-read-only_data.webtreemap-aggregate {
background: #CBD5E8;
}
.webtreemap-symbol-code.webtreemap-aggregate {
background: #F4CAE4;
}
.webtreemap-symbol-weak_symbol.webtreemap-aggregate {
background: #E6F5C9;
}
#legend > * {
border: solid 1px #444;
}
/* Optional: Different borders depending on level. */
.webtreemap-level0 {
border: solid 1px #444;
}
.webtreemap-level1 {
border: solid 1px #666;
}
.webtreemap-level2 {
border: solid 1px #888;
}
.webtreemap-level3 {
border: solid 1px #aaa;
}
.webtreemap-level4 {
border: solid 1px #ccc;
}
/* Optional: styling on node captions. */
.webtreemap-caption {
font-family: sans-serif;
font-size: 11px;
padding: 2px;
text-align: center;
}
/* Optional: styling on captions on mouse hover. */
/*.webtreemap-node:hover > .webtreemap-caption {
text-decoration: underline;
}*/
html, body {
height: 100%;
}
body {
font-family: sans-serif;
font-size: 0.8em;
margin: 0;
}
#nav {
padding: 5px 10px;
}
:target {
font-weight:bold;
}
#map {
top: 30px;
bottom: 10px;
left: 10px;
right: 10px;
position: absolute;
cursor: pointer;
-webkit-user-select: none;
}
#loader {
margin: auto;
width: 250px;
}
#progress {
animation: load 30s ease-out infinite;
background: #bada55;
height: 3px;
margin: 0 0 3px;
}
@keyframes load {
from {width:0;}
to {width: 100%;}
}
</style>
</head>
<body>
<div id='nav'></div>
<div id='map'>
<div id='loader'>
<div id='progress'></div>
Building fresh production source maps...
</div>
</div>
<script>
// Vendored from https://github.com/rmmh/webtreemap/blob/9fa0c066a10ea4402d960b0c6c1a432846ac7fc4/webtreemap.js
// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Size of border around nodes.
// We could support arbitrary borders using getComputedStyle(), but I am
// skeptical the extra complexity (and performance hit) is worth it.
;(function() {
var kBorderWidth = 1;
// Padding around contents.
// TODO: do this with a nested div to allow it to be CSS-styleable.
var kPadding = 4;
// x/y ratio to aim for -- wider rectangles are better for text display
var kAspectRatio = 1.2;
var focused = null;
function focus(tree) {
focused = tree;
// Hide all visible siblings of all our ancestors by lowering them.
var level = 0;
var root = tree;
while (root.parent) {
root = root.parent;
level += 1;
for (var i = 0, sibling; sibling = root.children[i]; ++i) {
if (sibling.dom)
sibling.dom.style.zIndex = 0;
}
}
var width = root.dom.offsetWidth;
var height = root.dom.offsetHeight;
// Unhide (raise) and maximize us and our ancestors.
for (var t = tree; t.parent; t = t.parent) {
// Shift off by border so we don't get nested borders.
position(t.dom, -kBorderWidth, -kBorderWidth, width, height);
t.dom.style.zIndex = 1;
}
// And layout into the topmost box.
layout(tree, level, width, height);
}
function makeDom(tree, level) {
var dom = document.createElement('div');
dom.style.zIndex = 1;
dom.className = 'webtreemap-node webtreemap-level' + Math.min(level, 4);
if (tree.data['$symbol']) {
dom.className += (' webtreemap-symbol-' +
tree.data['$symbol'].replace(' ', '_'));
}
if (tree.data['$dominant_symbol']) {
dom.className += (' webtreemap-symbol-' +
tree.data['$dominant_symbol'].replace(' ', '_'));
dom.className += (' webtreemap-aggregate');
}
dom.onmousedown = function(e) {
if (e.button == 0) {
if (focused && tree == focused && focused.parent) {
focus(focused.parent);
} else {
focus(tree);
}
}
e.stopPropagation();
return true;
};
var caption = document.createElement('div');
caption.className = 'webtreemap-caption';
caption.innerHTML = tree.name;
dom.appendChild(caption);
dom.title = tree.name;
tree.dom = dom;
return dom;
}
function position(dom, x, y, width, height) {
// CSS width/height does not include border.
width -= kBorderWidth*2;
height -= kBorderWidth*2;
dom.style.left = x + 'px';
dom.style.top = y + 'px';
dom.style.width = Math.max(width, 0) + 'px';
dom.style.height = Math.max(height, 0) + 'px';
}
// Given a list of rectangles |nodes|, the 1-d space available
// |space|, and a starting rectangle index |start|, compute an span of
// rectangles that optimizes a pleasant aspect ratio.
//
// Returns [end, sum], where end is one past the last rectangle and sum is the
// 2-d sum of the rectangles' areas.
function selectSpan(nodes, space, start) {
// Add rectangle one by one, stopping when aspect ratios begin to go
// bad. Result is [start,end) covering the best run for this span.
// http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.36.6685
var node = nodes[start];
var rmin = node.data['$area']; // Smallest seen child so far.
var rmax = rmin; // Largest child.
var rsum = 0; // Sum of children in this span.
var last_score = 0; // Best score yet found.
for (var end = start; node = nodes[end]; ++end) {
var size = node.data['$area'];
if (size < rmin)
rmin = size;
if (size > rmax)
rmax = size;
rsum += size;
// This formula is from the paper, but you can easily prove to
// yourself it's taking the larger of the x/y aspect ratio or the
// y/x aspect ratio. The additional magic fudge constant of kAspectRatio
// lets us prefer wider rectangles to taller ones.
var score = Math.max(space*space*rmax / (rsum*rsum),
kAspectRatio*rsum*rsum / (space*space*rmin));
if (last_score && score > last_score) {
rsum -= size; // Undo size addition from just above.
break;
}
last_score = score;
}
return [end, rsum];
}
function layout(tree, level, width, height) {
if (!('children' in tree))
return;
var total = tree.data['$area'];
// XXX why do I need an extra -1/-2 here for width/height to look right?
var x1 = 0, y1 = 0, x2 = width - 1, y2 = height - 2;
x1 += kPadding; y1 += kPadding;
x2 -= kPadding; y2 -= kPadding;
y1 += 14; // XXX get first child height for caption spacing
var pixels_to_units = Math.sqrt(total / ((x2 - x1) * (y2 - y1)));
// The algorithm does best at laying out items from largest to smallest.
// Sort them to ensure this.
if (!tree.children.sorted) {
tree.children.sort(function (a, b) {
return b.data['$area'] - a.data['$area'];
});
tree.children.sorted = true;
}
for (var start = 0, child; child = tree.children[start]; ++start) {
if (x2 - x1 < 60 || y2 - y1 < 40) {
if (child.dom) {
child.dom.style.zIndex = 0;
position(child.dom, -2, -2, 0, 0);
}
continue;
}
// Dynamically decide whether to split in x or y based on aspect ratio.
var ysplit = ((y2 - y1) / (x2 - x1)) > kAspectRatio;
var space; // Space available along layout axis.
if (ysplit)
space = (y2 - y1) * pixels_to_units;
else
space = (x2 - x1) * pixels_to_units;
var span = selectSpan(tree.children, space, start);
var end = span[0], rsum = span[1];
// Now that we've selected a span, lay out rectangles [start,end) in our
// available space.
var x = x1, y = y1;
for (var i = start; i < end; ++i) {
child = tree.children[i];
if (!child.dom) {
child.parent = tree;
child.dom = makeDom(child, level + 1);
tree.dom.appendChild(child.dom);
} else {
child.dom.style.zIndex = 1;
}
var size = child.data['$area'];
var frac = size / rsum;
if (ysplit) {
width = rsum / space;
height = size / width;
} else {
height = rsum / space;
width = size / height;
}
width /= pixels_to_units;
height /= pixels_to_units;
width = Math.round(width);
height = Math.round(height);
position(child.dom, x, y, width, height);
if ('children' in child) {
layout(child, level + 1, width, height);
}
if (ysplit)
y += height;
else
x += width;
}
// Shrink our available space based on the amount we used.
if (ysplit)
x1 += Math.round((rsum / space) / pixels_to_units);
else
y1 += Math.round((rsum / space) / pixels_to_units);
// end points one past where we ended, which is where we want to
// begin the next iteration, but subtract one to balance the ++ in
// the loop.
start = end - 1;
}
}
function appendTreemap(dom, data) {
var style = getComputedStyle(dom, null);
var width = parseInt(style.width);
var height = parseInt(style.height);
if (!data.dom)
makeDom(data, 0);
dom.appendChild(data.dom);
position(data.dom, 0, 0, width, height);
layout(data, 0, width, height);
}
window.appendTreemap = appendTreemap;
})(window);
var data = ${JSON.stringify(data)};
var tree = mergeChunks(data);
var treeData = {};
var nav = document.getElementById('nav');
var map = document.getElementById('map');
if (typeof EventSource === 'undefined') {
var error = 'Your browser does not support Server Side Events. Try using a different browser';
map.innerHTML = error;
throw new Error(error);
}
var source = new EventSource("/_sse");
source.addEventListener("message", function(event) {
data = JSON.parse(event.data);
tree = mergeChunks(data);
makeNav(data);
build(find(location.hash));
}, false);
if (data) {
makeNav(data);
build(find(location.hash));
}
function makeNav(data) {
if (!data) return;
var all = '<a id="all" href="#all" onclick="build(tree)">All</a>';
var individual = data.map(function(item) {
return '<a ' +
'id="' + item.chunk + '" ' +
'href="#' + item.chunk + '" ' +
'onclick="build(find(\\'#' + item.chunk + '\\'))">' +
item.chunk +
'</a>';
});
var links = [all].concat(individual).join(' | ');
nav.innerHTML = 'Chunks: ' + links;
}
function mergeChunks(data) {
if (!data) return null;
return data.reduce(function(tree, item) {
for (var key in item.sizes) {
tree[key] = item.sizes[key];
}
return tree;
}, {});
}
function find(hash) {
var chunk = hash.slice(1);
if (chunk === 'all') {
return tree;
}
return data.find(function(d) {
return d.chunk === chunk
})
.sizes;
}
function newNode(name) {
return {
name: name,
data: {
'$area': 0,
},
children: [],
};
}
function addNode(path, size) {
var parts = path.replace(/^\\//, '').split('/');
var node = treeData;
node.data['$area'] += size;
parts.forEach(function(part) {
var child = node.children.find(function(child) {
return child.name == part;
});
if (!child) {
var child = newNode(part);
node.children.push(child);
}
node = child;
node.data['$area'] += size;
});
}
function addSizeToTitle(node, total) {
var size = node.data['$area'];
var pct = 100.0 * size / total;
node.name += ' • ' + size + ' • ' + pct.toFixed(1) + '%';
node.children.forEach(function(x) {
addSizeToTitle(x, total)
});
}
function build(tree) {
treeData = newNode('');
for (var source in tree) {
addNode(source, tree[source]);
}
addSizeToTitle(treeData, treeData.data['$area']);
fitToSize();
}
function fitToSize() {
map.style.top = nav.offsetHeight + 'px';
if (treeData.data) appendTreemap(map, treeData);
}
window.addEventListener('resize', fitToSize);
</script>
</body>
</html>
`;
}