import-maps-webpack-plugin/lib/index.js

A plugin for providing static import maps support to Webpack.

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.ImportMapsWebpackPlugin = void 0;
var webpack_virtual_modules_1 = __importDefault(require("webpack-virtual-modules"));
var helpers_1 = require("./helpers");
var ImportMapsWebpackPlugin = /** @class */ (function () {
    function ImportMapsWebpackPlugin() {
    }
    ImportMapsWebpackPlugin.prototype.apply = function (compiler) {
        var root = process.cwd();
        var dir = helpers_1.getPackageDir(root);
        var map = helpers_1.resolveImportMap(dir);
        var keys = Object.keys((map && map.imports) || {});
        var localImports = keys.map(function (id) { return "{\n  id: " + helpers_1.getHashFor(root, dir, map.imports[id]) + ",\n  ref: " + JSON.stringify(id) + ",\n  load: () => " + helpers_1.getImportFor(root, dir, map.imports[id]) + ",\n}"; });
        var plugin = new webpack_virtual_modules_1.default(keys.reduce(function (prev, id) {
            prev[id] = "\n            module.exports = require('importmap').resolve(" + JSON.stringify(id) + ");\n        ";
            return prev;
        }, {
            'node_modules/importmap.js': "\nif (!window.__importMaps) {\n  const imports = [];\n  window.__importMaps = true;\n  window.__resolveImport = function (id) {\n    for (const item of imports) {\n      if (item.id === id) {\n        return item;\n      }\n    }\n    return {};\n  };\n  window.__registerImports = function (newImports) {\n    newImports.forEach(i => {\n      if (!imports.some(j => j.id === i.id)) {\n        const item = {\n          id: i.id,\n          data: undefined,\n        };\n        item.loading = i.load().then(data => (item.data = data), err => console.error(err));\n        imports.push(item);\n      }\n    });\n  };\n}\nconst localImports = [" + localImports.join(',') + "];\nwindow.__registerImports(localImports);\nfunction getId(ref) {\n  const [id] = localImports.filter(i => i.ref === ref).map(i => i.id);\n  return id;\n}\nexports.ready = function (ref) {\n  const refs = Array.isArray(ref) ? ref : (ref ? [ref] : localImports.map(i => i.ref));\n  return Promise.all(refs.map(ref => window.__resolveImport(getId(ref)).loading));\n};\nexports.resolve = function (ref) {\n  return window.__resolveImport(getId(ref)).data;\n}\n",
        }));
        plugin.apply(compiler);
    };
    return ImportMapsWebpackPlugin;
}());
exports.ImportMapsWebpackPlugin = ImportMapsWebpackPlugin;
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