Files F98013669

generate-helpers.js
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Created: Wed, Jan 8, 15:54

generate-helpers.js
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	import fs from "fs";
	import { join } from "path";
	import { URL, fileURLToPath } from "url";
	import { minify } from "terser"; // eslint-disable-line import/no-extraneous-dependencies

	const HELPERS_FOLDER = new URL("../src/helpers", import.meta.url);
	const IGNORED_FILES = new Set(["package.json"]);

	export default async function generateHelpers() {
	let output = `/*
	* This file is auto-generated! Do not modify it directly.
	* To re-generate run 'yarn gulp generate-runtime-helpers'
	*/

	import template from "@babel/template";

	function helper(minVersion: string, source: string) {
	return Object.freeze({
	minVersion,
	ast: () => template.program.ast(source, { preserveComments: true }),
	})
	}

	export default Object.freeze({
	`;

	for (const file of (await fs.promises.readdir(HELPERS_FOLDER)).sort()) {
	if (IGNORED_FILES.has(file)) continue;
	if (file.startsWith(".")) continue; // ignore e.g. vim swap files

	const [helperName] = file.split(".");

	const filePath = join(fileURLToPath(HELPERS_FOLDER), file);
	if (!file.endsWith(".js")) {
	console.error("ignoring", filePath);
	continue;
	}

	const fileContents = await fs.promises.readFile(filePath, "utf8");
	const minVersionMatch = fileContents.match(
	/^\s\/\\s@minVersion\s+(?<minVersion>\S+)\s\\/\s$/m
	);
	if (!minVersionMatch) {
	throw new Error(`@minVersion number missing in ${filePath}`);
	}
	const { minVersion } = minVersionMatch.groups;

	const source = await minify(fileContents, {
	mangle: false,
	// The _typeof helper has a custom directive that we must keep
	compress: { directives: false },
	});

	output += `\
	${JSON.stringify(helperName)}: helper(
	${JSON.stringify(minVersion)},
	${JSON.stringify(source.code)},
	),
	`;
	}

	output += "});";
	return output;
	}

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