63 lines
1.7 KiB
JavaScript
63 lines
1.7 KiB
JavaScript
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import fs from "node:fs/promises";
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import esbuild from "esbuild";
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import * as importMetaResolve from "import-meta-resolve";
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import { outdent } from "outdent";
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import * as prettier from "prettier";
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import * as typescript from "typescript";
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import { modifyTypescriptModule } from "./build/modify-typescript-module.js";
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import UNUSED_SPECIFIERS from "./build/typescript-unused-specifiers.js";
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async function getRemovedSpecifiers(code, exports) {
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let errors = [];
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try {
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await esbuild.transformSync(code, { loader: "js" });
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return;
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} catch (error) {
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({ errors } = error);
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}
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const specifiers = [];
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for (const { text } of errors) {
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const match = text.match(
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/^"(?<variable>.*?)" is not declared in this file$/,
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);
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if (match) {
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const { specifier } = exports.find(
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({ variable }) => variable === match.groups.variable,
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);
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specifiers.push(specifier);
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}
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}
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return specifiers;
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}
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async function main() {
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const original = await fs.readFile(
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new URL(importMetaResolve.resolve("typescript", import.meta.url)),
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"utf8",
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);
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const { code, exports } = modifyTypescriptModule(original);
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let specifiers = (await getRemovedSpecifiers(code, exports)) ?? [];
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specifiers = [...new Set([...UNUSED_SPECIFIERS, ...specifiers])]
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.filter((specifier) => Object.hasOwn(typescript, specifier))
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.sort();
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await fs.writeFile(
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new URL("./build/typescript-unused-specifiers.js", import.meta.url),
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await prettier.format(
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outdent`
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export default new Set(${JSON.stringify(specifiers, undefined, 2)});
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`,
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{ parser: "meriyah" },
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),
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);
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console.log("typescript-unused-specifiers.js updated.");
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}
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await main();
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