element-web/scripts/analyse_unused_exports.js

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#!/usr/bin/env node
'use strict';
const fs = require("fs");
const { exec } = require("node:child_process");
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const includeJSSDK = process.argv.includes("--include-js-sdk");
const ignore = [];
ignore.push(...Object.values(JSON.parse(fs.readFileSync(`${__dirname}/../components.json`))));
ignore.push("/index.ts");
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// We ignore js-sdk by default as it may export for other non element-web projects
if (!includeJSSDK) ignore.push("matrix-js-sdk");
const command = `yarn ts-prune --ignore "${ignore.join("|")}" | grep -v "(used in module)"`;
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exec(command, (error, stdout, stderr) => {
if (error) throw error;
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// We have to do this as piping the output of ts-prune causes the return
// code to be 0
if (stderr) throw Error(stderr);
let lines = stdout.split("\n");
// Remove the first line as that is the command that was being run and we
// log that only in case of an error
lines.splice(0, 1);
// Remove the last line as it is empty
lines.pop();
// ts-prune has bug where if the unused export is in a dependency, the path
// won't have an "/" character at the start, so we try to fix that for
// better UX
// TODO: This might break on Windows
lines = lines.reduce((newLines, line) => {
if (!line.startsWith("/")) newLines.push("/" + line);
else newLines.push(line);
return newLines;
}, []);
// If an unused export has been found, we error
if (lines.length > 0) {
console.log(`Command that was run: ${command}`);
console.log(lines.join("\n"));
throw Error("Unused exports found!");
}
console.log("Success - no unused exports found!");
});