index.js

import MagicString from "magic-string";
import {createFilter} from "./lib/pluginutils.js";
import importToGlobals from "./lib/import-to-globals.js";

const defaultDynamicWrapper = id => `Promise.resolve(${id})`;

function externalGlobals(globals, {include, exclude, dynamicWrapper = defaultDynamicWrapper} = {}) {
    if (!globals) {
        throw new TypeError("Missing mandatory option 'globals'");
    }
    let getName = globals;
    const globalsType = typeof globals;
    const isGlobalsObj = globalsType === "object";
    if (isGlobalsObj) {
        getName = function (name) {
            if (Object.prototype.hasOwnProperty.call(globals, name)) {
                return globals[name];
            }
        };
    } else if (globalsType !== "function") {
        throw new TypeError(`Unexpected type of 'globals', got '${globalsType}'`);
    }
    const dynamicWrapperType = typeof dynamicWrapper;
    if (dynamicWrapperType !== "function") {
        throw new TypeError(`Unexpected type of 'dynamicWrapper', got '${dynamicWrapperType}'`);
    }
    const filter = createFilter(include, exclude);
    return {
        name: "rollup-plugin-external-globals", transform
    };

    async function transform(code, id) {
        if ((id[0] !== "\0" && !filter(id)) || (isGlobalsObj && Object.keys(globals).every(id => !code.includes(id)))) {
            return;
        }
        const ast = this.parse(code);
        code = new MagicString(code);
        const isTouched = await importToGlobals({
            ast, code, getName, getDynamicWrapper: dynamicWrapper
        });
        return isTouched ? {
            code: code.toString(), map: code.generateMap()
        } : undefined;
    }
}

export {externalGlobals};
export default externalGlobals;