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diskless.js
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diskless.js
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"use strict";
let path = require("path");
let PREFIX = "diskless:";
// Rollup plugin for virtual modules
// `referenceDir` is used for relative imports from diskless modules
// `resolver` is the Rollup plugin responsible for import paths
// `modules` maps file names to source code
module.exports = (referenceDir, resolver, modules = new Map(), prefix = PREFIX) => ({
name: "diskless",
resolveId(importee, importer) {
if(importer && importer.startsWith(prefix)) {
let virtual = path.resolve(referenceDir, importer);
// this is pretty hacky, but necessary because Rollup doesn't
// support combining different plugins' `#resolveId`
return resolver.resolveId(importee, virtual);
}
return importee.startsWith(prefix) ? importee : null;
},
load(id) {
if(!id.startsWith(prefix)) {
return null;
}
let filename = id.substr(prefix.length);
let source = modules.get(filename);
if(source === undefined) {
throw new Error(`missing diskless module: ${filename}`);
}
return source;
},
register(filename, source) {
modules.set(filename, source);
},
deregister(filename) {
return modules.delete(filename);
},
get prefix() {
return prefix;
}
});