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65 lines
1.8 KiB
65 lines
1.8 KiB
import fs from "fs";
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import { join } from "path";
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import { URL, fileURLToPath } from "url";
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import { minify } from "terser"; // eslint-disable-line import/no-extraneous-dependencies
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const HELPERS_FOLDER = new URL("../src/helpers", import.meta.url);
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const IGNORED_FILES = new Set(["package.json"]);
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export default async function generateHelpers() {
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let output = `/*
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* This file is auto-generated! Do not modify it directly.
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* To re-generate run 'yarn gulp generate-runtime-helpers'
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*/
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import template from "@babel/template";
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function helper(minVersion: string, source: string) {
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return Object.freeze({
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minVersion,
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ast: () => template.program.ast(source, { preserveComments: true }),
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})
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}
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export default Object.freeze({
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`;
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for (const file of (await fs.promises.readdir(HELPERS_FOLDER)).sort()) {
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if (IGNORED_FILES.has(file)) continue;
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if (file.startsWith(".")) continue; // ignore e.g. vim swap files
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const [helperName] = file.split(".");
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const filePath = join(fileURLToPath(HELPERS_FOLDER), file);
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if (!file.endsWith(".js")) {
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console.error("ignoring", filePath);
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continue;
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}
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const fileContents = await fs.promises.readFile(filePath, "utf8");
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const minVersionMatch = fileContents.match(
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/^\s*\/\*\s*@minVersion\s+(?<minVersion>\S+)\s*\*\/\s*$/m
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);
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if (!minVersionMatch) {
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throw new Error(`@minVersion number missing in ${filePath}`);
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}
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const { minVersion } = minVersionMatch.groups;
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const source = await minify(fileContents, {
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mangle: false,
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// The _typeof helper has a custom directive that we must keep
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compress: { directives: false },
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});
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output += `\
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${JSON.stringify(helperName)}: helper(
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${JSON.stringify(minVersion)},
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${JSON.stringify(source.code)},
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),
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`;
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}
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output += "});";
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return output;
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}
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