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utils.mjs
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/* eslint-disable no-restricted-globals */
// eslint-disable-next-line @typescript-eslint/triple-slash-reference
/// <reference path="../types/ambient.d.ts" />
import fs from "fs";
import path from "path";
import log from "fancy-log";
import del from "del";
import File from "vinyl";
import ts from "../../lib/typescript.js";
import chalk from "chalk";
import which from "which";
import { spawn } from "child_process";
import { Duplex } from "stream";
import assert from "assert";
/**
* Executes the provided command once with the supplied arguments.
* @param {string} cmd
* @param {string[]} args
* @param {ExecOptions} [options]
*
* @typedef ExecOptions
* @property {boolean} [ignoreExitCode]
* @property {boolean} [hidePrompt]
* @property {boolean} [waitForExit=true]
*/
export async function exec(cmd, args, options = {}) {
return /**@type {Promise<{exitCode?: number}>}*/(new Promise((resolve, reject) => {
const { ignoreExitCode, waitForExit = true } = options;
if (!options.hidePrompt) log(`> ${chalk.green(cmd)} ${args.join(" ")}`);
const proc = spawn(which.sync(cmd), args, { stdio: waitForExit ? "inherit" : "ignore" });
if (waitForExit) {
proc.on("exit", exitCode => {
if (exitCode === 0 || ignoreExitCode) {
resolve({ exitCode: exitCode ?? undefined });
}
else {
reject(new Error(`Process exited with code: ${exitCode}`));
}
});
proc.on("error", error => {
reject(error);
});
}
else {
proc.unref();
// wait a short period in order to allow the process to start successfully before Node exits.
setTimeout(() => resolve({ exitCode: undefined }), 100);
}
}));
}
/**
* @param {ts.Diagnostic[]} diagnostics
* @param {{ cwd?: string, pretty?: boolean }} [options]
*/
function formatDiagnostics(diagnostics, options) {
return options && options.pretty
? ts.formatDiagnosticsWithColorAndContext(diagnostics, getFormatDiagnosticsHost(options && options.cwd))
: ts.formatDiagnostics(diagnostics, getFormatDiagnosticsHost(options && options.cwd));
}
/**
* @param {ts.Diagnostic[]} diagnostics
* @param {{ cwd?: string }} [options]
*/
function reportDiagnostics(diagnostics, options) {
log(formatDiagnostics(diagnostics, { cwd: options && options.cwd, pretty: process.stdout.isTTY }));
}
/**
* @param {string | undefined} cwd
* @returns {ts.FormatDiagnosticsHost}
*/
function getFormatDiagnosticsHost(cwd) {
return {
getCanonicalFileName: fileName => fileName,
getCurrentDirectory: () => cwd ?? process.cwd(),
getNewLine: () => ts.sys.newLine,
};
}
/**
* Reads JSON data with optional comments using the LKG TypeScript compiler
* @param {string} jsonPath
*/
export function readJson(jsonPath) {
const jsonText = fs.readFileSync(jsonPath, "utf8");
const result = ts.parseConfigFileTextToJson(jsonPath, jsonText);
if (result.error) {
reportDiagnostics([result.error]);
throw new Error("An error occurred during parse.");
}
return result.config;
}
/**
* @param {string | string[]} source
* @param {string | string[]} dest
* @returns {boolean}
*/
export function needsUpdate(source, dest) {
if (typeof source === "string" && typeof dest === "string") {
if (fs.existsSync(dest)) {
const {mtime: outTime} = fs.statSync(dest);
const {mtime: inTime} = fs.statSync(source);
if (+inTime <= +outTime) {
return false;
}
}
}
else if (typeof source === "string" && typeof dest !== "string") {
const {mtime: inTime} = fs.statSync(source);
for (const filepath of dest) {
if (fs.existsSync(filepath)) {
const {mtime: outTime} = fs.statSync(filepath);
if (+inTime > +outTime) {
return true;
}
}
else {
return true;
}
}
return false;
}
else if (typeof source !== "string" && typeof dest === "string") {
if (fs.existsSync(dest)) {
const {mtime: outTime} = fs.statSync(dest);
for (const filepath of source) {
if (fs.existsSync(filepath)) {
const {mtime: inTime} = fs.statSync(filepath);
if (+inTime > +outTime) {
return true;
}
}
else {
return true;
}
}
return false;
}
}
else if (typeof source !== "string" && typeof dest !== "string") {
for (let i = 0; i < source.length; i++) {
if (!dest[i]) {
continue;
}
if (fs.existsSync(dest[i])) {
const {mtime: outTime} = fs.statSync(dest[i]);
const {mtime: inTime} = fs.statSync(source[i]);
if (+inTime > +outTime) {
return true;
}
}
else {
return true;
}
}
return false;
}
return true;
}
export function getDiffTool() {
const program = process.env.DIFF;
if (!program) {
log.warn("Add the 'DIFF' environment variable to the path of the program you want to use.");
process.exit(1);
}
return program;
}
/**
* Find the size of a directory recursively.
* Symbolic links can cause a loop.
* @param {string} root
* @returns {number} bytes
*/
export function getDirSize(root) {
const stats = fs.lstatSync(root);
if (!stats.isDirectory()) {
return stats.size;
}
return fs.readdirSync(root)
.map(file => getDirSize(path.join(root, file)))
.reduce((acc, num) => acc + num, 0);
}
/**
* @param {string | ((file: File) => string) | { cwd?: string }} [dest]
* @param {{ cwd?: string }} [opts]
*/
export function rm(dest, opts) {
if (dest && typeof dest === "object") {
opts = dest;
dest = undefined;
}
let failed = false;
const cwd = path.resolve(opts && opts.cwd || process.cwd());
/** @type {{ file: File, deleted: boolean, promise: Promise<any>, cb: Function }[]} */
const pending = [];
const processDeleted = () => {
if (failed) return;
while (pending.length && pending[0].deleted) {
const fileAndCallback = pending.shift();
assert(fileAndCallback);
const { file, cb } = fileAndCallback;
duplex.push(file);
cb();
}
};
const duplex = new Duplex({
objectMode: true,
/**
* @param {string|Buffer|File} file
*/
write(file, _, cb) {
if (failed) return;
if (typeof file === "string" || Buffer.isBuffer(file)) return cb(new Error("Only Vinyl files are supported."));
const basePath = typeof dest === "string" ? path.resolve(cwd, dest) :
typeof dest === "function" ? path.resolve(cwd, dest(file)) :
file.base;
const filePath = path.resolve(basePath, file.relative);
file.cwd = cwd;
file.base = basePath;
file.path = filePath;
const entry = {
file,
deleted: false,
cb,
promise: del(file.path).then(() => {
entry.deleted = true;
processDeleted();
}, err => {
failed = true;
pending.length = 0;
cb(err);
})
};
pending.push(entry);
},
final(cb) {
// eslint-disable-next-line no-null/no-null
const endThenCb = () => (duplex.push(null), cb()); // signal end of read queue
processDeleted();
if (pending.length) {
Promise
.all(pending.map(entry => entry.promise))
.then(() => processDeleted())
.then(() => endThenCb(), endThenCb);
return;
}
endThenCb();
},
read() {
}
});
return duplex;
}
class Deferred {
constructor() {
this.promise = new Promise((resolve, reject) => {
this.resolve = resolve;
this.reject = reject;
});
}
}
export class Debouncer {
/**
* @param {number} timeout
* @param {() => Promise<any>} action
*/
constructor(timeout, action) {
this._timeout = timeout;
this._action = action;
}
enqueue() {
if (this._timer) {
clearTimeout(this._timer);
this._timer = undefined;
}
if (!this._deferred) {
this._deferred = new Deferred();
}
this._timer = setTimeout(() => this.run(), 100);
return this._deferred.promise;
}
run() {
if (this._timer) {
clearTimeout(this._timer);
this._timer = undefined;
}
const deferred = this._deferred;
assert(deferred);
this._deferred = undefined;
try {
deferred.resolve(this._action());
}
catch (e) {
deferred.reject(e);
}
}
}