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module-types.js
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module-types.js
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import { isAsync, waitFor } from "../../gensync-utils/async";
import type { Handler } from "gensync";
import path from "path";
import { pathToFileURL } from "url";
let import_;
try {
// Node < 13.3 doesn't support import() syntax.
import_ = require("./import").default;
} catch {}
export default function* loadCjsOrMjsDefault(
filepath: string,
asyncError: string,
// TODO(Babel 8): Remove this
fallbackToTranspiledModule: boolean = false,
): Handler<mixed> {
switch (guessJSModuleType(filepath)) {
case "cjs":
return loadCjsDefault(filepath, fallbackToTranspiledModule);
case "unknown":
try {
return loadCjsDefault(filepath, fallbackToTranspiledModule);
} catch (e) {
if (e.code !== "ERR_REQUIRE_ESM") throw e;
}
// fall through
case "mjs":
if (yield* isAsync()) {
return yield* waitFor(loadMjsDefault(filepath));
}
throw new Error(asyncError);
}
}
function guessJSModuleType(filename: string): "cjs" | "mjs" | "unknown" {
switch (path.extname(filename)) {
case ".cjs":
return "cjs";
case ".mjs":
return "mjs";
default:
return "unknown";
}
}
function loadCjsDefault(filepath: string, fallbackToTranspiledModule: boolean) {
const module = (require(filepath): mixed);
return module?.__esModule
? // TODO (Babel 8): Remove "module" and "undefined" fallback
module.default || (fallbackToTranspiledModule ? module : undefined)
: module;
}
async function loadMjsDefault(filepath: string) {
if (!import_) {
throw new Error(
"Internal error: Native ECMAScript modules aren't supported" +
" by this platform.\n",
);
}
// import() expects URLs, not file paths.
// https://github.com/nodejs/node/issues/31710
const module = await import_(pathToFileURL(filepath));
return module.default;
}