sucrase/dist/sucrase-babylon/index.mjs

Super-fast alternative to Babel for when you can target modern JS runtimes

import Parser, { plugins } from "./parser";
import "./tokenizer/context";
import flowPlugin from "./plugins/flow";
import jsxPlugin from "./plugins/jsx";
import typescriptPlugin from "./plugins/typescript";
plugins.flow = flowPlugin;
plugins.jsx = jsxPlugin;
plugins.typescript = typescriptPlugin;
export function parse(input, options) {
    return getParser(options, input).parse();
}
function getParser(options, input) {
    const Cls = options && options.plugins ? getParserClass(options.plugins) : Parser;
    return new Cls(options || null, input);
}
const parserClassCache = {};
/** Get a Parser class with plugins applied. */
function getParserClass(pluginsFromOptions) {
    // Filter out just the plugins that have an actual mixin associated with them.
    let pluginList = pluginsFromOptions.filter((p) => p === "flow" || p === "jsx" || p === "typescript");
    if (pluginList.indexOf("flow") >= 0) {
        // ensure flow plugin loads last
        pluginList = pluginList.filter((plugin) => plugin !== "flow");
        pluginList.push("flow");
    }
    if (pluginList.indexOf("flow") >= 0 && pluginList.indexOf("typescript") >= 0) {
        throw new Error("Cannot combine flow and typescript plugins.");
    }
    if (pluginList.indexOf("typescript") >= 0) {
        // ensure typescript plugin loads last
        pluginList = pluginList.filter((plugin) => plugin !== "typescript");
        pluginList.push("typescript");
    }
    const key = pluginList.join("/");
    let cls = parserClassCache[key];
    if (!cls) {
        cls = Parser;
        for (const plugin of pluginList) {
            cls = plugins[plugin](cls);
        }
        parserClassCache[key] = cls;
    }
    return cls;
}