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rollup.js
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rollup.js
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/* eslint max-statements: [ 1, 20 ] */
"use strict";
const fs = require("fs");
const path = require("path");
const { keyword } = require("esutils");
const utils = require("rollup-pluginutils");
const Processor = require("modular-css-core");
const output = require("modular-css-core/lib/output.js");
// sourcemaps for css-to-js don't make much sense, so always return nothing
// https://github.com/rollup/rollup/wiki/Plugins#conventions
const emptyMappings = {
mappings : "",
};
const makeFile = (details) => {
const { entry } = details;
const name = path.basename(entry, path.extname(entry));
return Object.assign(details, {
base : path.join(path.dirname(entry), name),
name,
});
};
module.exports = function(opts) {
const options = Object.assign(Object.create(null), {
common : "common.css",
json : false,
include : "**/*.css",
namedExports : true,
styleExport : false,
}, opts);
const filter = utils.createFilter(options.include, options.exclude);
const { styleExport, done, map } = options;
if(typeof map === "undefined") {
// Sourcemaps don't make much sense in styleExport mode
// But default to true otherwise
options.map = !styleExport;
}
const processor = options.processor || new Processor(options);
let runs = 0;
// Track which files were changed for which run to avoid excessive re-processing
const updated = new Map();
return {
name : "modular-css-rollup",
buildStart() {
// done lifecycle won't ever be called on per-component styles since
// it only happens at bundle compilation time
// Need to do this on buildStart so it has access to this.warn() o_O
if(styleExport && done) {
this.warn(
`Any plugins defined during the "done" lifecycle won't run when "styleExport" is set!`
);
}
},
async transform(code, id) {
if(!filter(id)) {
return null;
}
// Is this file being processed on a watch update?
if(runs++ && (id in processor.files)) {
const files = [];
// Watching will call transform w/ the same entry file, even if it
// was one of its dependencies that changed. We need to fork the logic
// here to handle that case.
if(processor.files[id].text === code) {
// figure out exactly which dependency changed
processor.dependencies(id).forEach((dep) => {
if(fs.readFileSync(dep, "utf8") === processor.files[dep].text) {
return;
}
files.push(dep, ...processor.dependents(dep));
});
} else {
// Entry file changed, remove all its dependents and
// then re-process them
files.push(id, ...processor.dependents(id));
}
files.forEach((file) => {
// Don't do the remove/re-add dance for any files that
// were already processed in this run
if(updated.has(file) && updated.get(file) === runs) {
return;
}
updated.set(file, runs);
processor.remove(file);
});
// Can't filter this using updated, it's already been updated
// by the remove loop up above but the processing still needs to happen
await Promise.all([ ...files ].map((dep) =>
processor.file(dep)
));
}
const { details, exports } = await processor.string(id, code);
const exported = output.join(exports);
const out = [
`export default ${JSON.stringify(exported, null, 4)};`,
];
if(options.namedExports) {
Object.entries(exported).forEach(([ ident, value ]) => {
if(keyword.isReservedWordES6(ident) || !keyword.isIdentifierNameES6(ident)) {
this.warn(`Invalid JS identifier "${ident}", unable to export`);
return;
}
out.push(`export var ${ident} = ${JSON.stringify(value)};`);
});
}
if(options.styleExport) {
out.push(`export var styles = ${JSON.stringify(details.result.css)};`);
}
return {
code : out.join("\n"),
map : emptyMappings,
dependencies : processor.dependencies(id),
};
},
async generateBundle(outputOptions, bundles) {
// styleExport disables all output file generation
if(styleExport) {
return;
}
const usage = new Map();
const common = new Map();
const files = [];
const { assetFileNames = "" } = outputOptions;
let to;
if(!outputOptions.file && !outputOptions.dir) {
to = path.join(process.cwd(), assetFileNames);
} else {
to = path.join(
outputOptions.dir ? outputOptions.dir : path.dirname(outputOptions.file),
assetFileNames
);
}
// First pass is used to calculate JS usage of CSS dependencies
Object.entries(bundles).forEach(([ entry, bundle ]) => {
const file = makeFile({
entry,
css : new Set(),
});
const { modules } = bundle;
// Get CSS files being used by each entry point
const css = Object.keys(modules).filter(filter);
// Get dependency chains for each file
css.forEach((start) => {
const used = [
...processor.dependencies(start),
start,
];
used.forEach((dep) => {
file.css.add(dep);
if(!usage.has(dep)) {
usage.set(dep, new Set());
}
usage.get(dep).add(entry);
});
});
files.push(file);
});
if(files.length === 1) {
// Only one entry file means we only need one bundle.
files[0].css = new Set(processor.dependencies());
} else {
// Multiple bundles means ref-counting to find the shared deps
// Second pass removes any dependencies appearing in multiple bundles
files.forEach((file) => {
const { css } = file;
file.css = new Set([ ...css ].filter((dep) => {
if(usage.get(dep).size > 1) {
common.set(dep, true);
return false;
}
return true;
}));
});
// Add any other files that weren't part of a bundle to the common chunk
Object.keys(processor.files).forEach((file) => {
if(!usage.has(file)) {
common.set(file, true);
}
});
// Common chunk only emitted if necessary
if(common.size) {
files.push(makeFile({
entry : options.common,
css : new Set([ ...common.keys() ]),
}));
}
}
await Promise.all(
files
.filter(({ css }) => css.size)
.map(async ({ base, name, css }, idx) => {
const id = this.emitAsset(`${base}.css`);
const result = await processor.output({
to : to.replace(/\[(name|extname)\]/g, (match, field) =>
(field === "name" ? name : ".css")
),
files : [ ...css ],
});
this.setAssetSource(id, result.css);
// result.compositions always includes all the info, so it
// doesn't actually matter which result we use. First one seems reasonable!
if(options.json && idx === 0) {
const file = typeof options.json === "string" ? options.json : "exports.json";
this.emitAsset(file, JSON.stringify(result.compositions, null, 4));
}
if(result.map) {
this.emitAsset(`${base}.css.map`, result.map.toString());
}
})
);
},
};
};