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64 lines
1.8 KiB
64 lines
1.8 KiB
4 years ago
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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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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 generateAsserts() {
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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 'make build'
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*/
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import template from "@babel/template";
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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 isValidId = isValidBindingIdentifier(helperName);
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const varName = isValidId ? helperName : `_${helperName}`;
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const filePath = join(fileURLToPath(HELPERS_FOLDER), file);
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const fileContents = await fs.promises.readFile(filePath, "utf8");
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const minVersionMatch = fileContents.match(
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/^\s*\/\*\s*@minVersion\s+(?<minVersion>\S+)\s*\*\/\s*$/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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// TODO: We can minify the helpers in production
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const source = fileContents
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// Remove comments
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.replace(/\/\*[^]*?\*\/|\/\/.*/g, "")
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// Remove multiple newlines
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.replace(/\n{2,}/g, "\n");
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const intro = isValidId
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? "export "
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: `export { ${varName} as ${helperName} }\n`;
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output += `\n${intro}const ${varName} = {
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minVersion: ${JSON.stringify(minVersion)},
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ast: () => template.program.ast(${JSON.stringify(source)})
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};\n`;
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}
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return output;
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}
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function isValidBindingIdentifier(name) {
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try {
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Function(`var ${name}`);
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return true;
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} catch {
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return false;
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}
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}
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