110 lines
2.9 KiB
TypeScript
110 lines
2.9 KiB
TypeScript
/**
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* This tiny wrapper file checks for known node flags and appends them
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* when found, before invoking the "real" _babel-node(1) executable.
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*/
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import getV8Flags from "v8flags";
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import path from "path";
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import child_process from "child_process";
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import { fileURLToPath } from "url";
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const args = [
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path.join(path.dirname(fileURLToPath(import.meta.url)), "_babel-node"),
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];
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let babelArgs = process.argv.slice(2);
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let userArgs;
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// separate node arguments from script arguments
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const argSeparator = babelArgs.indexOf("--");
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if (argSeparator > -1) {
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userArgs = babelArgs.slice(argSeparator); // including the --
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babelArgs = babelArgs.slice(0, argSeparator);
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}
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/**
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* Replace dashes with underscores in the v8Flag name
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* Also ensure that if the arg contains a value (e.g. --arg=true)
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* that only the flag is returned.
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*/
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function getNormalizedV8Flag(arg) {
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// v8 uses the "no" prefix to negate boolean flags (e.g. --nolazy),
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// but they are not listed by v8flags
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const matches = arg.match(/--(?:no)?(.+)/);
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if (matches) {
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return `--${matches[1].replace(/-/g, "_")}`;
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}
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return arg;
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}
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// These are aliases for node options defined by babel-node.
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const aliases = new Map([
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["-d", "--debug"],
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["-gc", "--expose-gc"],
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]);
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getV8Flags(async function (err, v8Flags) {
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for (let i = 0; i < babelArgs.length; i++) {
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const arg = babelArgs[i];
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const flag = arg.split("=")[0];
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if (flag === "-r" || flag === "--require") {
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args.push(flag);
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args.push(babelArgs[++i]);
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} else if (aliases.has(flag)) {
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args.unshift(aliases.get(flag));
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} else if (
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flag === "debug" || // node debug foo.js
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flag === "inspect" ||
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v8Flags.indexOf(getNormalizedV8Flag(flag)) >= 0 ||
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process.allowedNodeEnvironmentFlags.has(flag)
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) {
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args.unshift(arg);
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} else {
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args.push(arg);
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}
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}
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// append arguments passed after --
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if (argSeparator > -1) {
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args.push(...userArgs);
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}
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try {
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const { default: kexec } = await import("kexec");
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kexec(process.argv[0], args);
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} catch (err) {
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if (
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err.code !== "ERR_MODULE_NOT_FOUND" &&
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err.code !== "MODULE_NOT_FOUND" &&
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err.code !== "UNDECLARED_DEPENDENCY"
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) {
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throw err;
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}
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// passthrough IPC only if babel-node itself has an IPC channel
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const shouldPassthroughIPC = process.send !== undefined;
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const proc = child_process.spawn(process.argv[0], args, {
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stdio: shouldPassthroughIPC
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? ["inherit", "inherit", "inherit", "ipc"]
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: "inherit",
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});
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proc.on("exit", function (code, signal) {
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process.on("exit", function () {
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if (signal) {
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process.kill(process.pid, signal);
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} else {
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process.exitCode = code;
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}
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});
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});
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if (shouldPassthroughIPC) {
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proc.on("message", message => process.send(message));
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}
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process.on("SIGINT", () => proc.kill("SIGINT"));
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process.on("SIGTERM", () => proc.kill("SIGTERM"));
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}
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});
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