@boost/module/mjs/hook-typescript.mjs

Module resolving and loading utilities with TypeScript support.

function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), !0).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == typeof i ? i : String(i); }
function _toPrimitive(t, r) { if ("object" != typeof t || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != typeof i) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
// Bundled with Packemon: https://packemon.dev
// Platform: node, Support: stable, Format: mjs

import fs from 'node:fs';
import { fileURLToPath } from 'node:url';

/* eslint-disable no-magic-numbers */

const COMPILER_OPTIONS = {
  allowJs: true,
  allowSyntheticDefaultImports: true,
  esModuleInterop: true,
  noEmit: true
};
const NODE_VERSION = Number.parseFloat(process.version.slice(1));
function isNodeNext(path) {
  return path.endsWith('.cts') || path.endsWith('.mts');
}
function isTypeScript(path) {
  return path.endsWith('.ts') || path.endsWith('.tsx') || isNodeNext(path);
}
function getModuleFromNodeVersion(ts, nodeNext) {
  if (nodeNext) {
    return ts.ModuleKind.NodeNext;
  }
  if (NODE_VERSION >= 20) {
    return ts.ModuleKind.ESNext;
  }
  if (NODE_VERSION >= 18) {
    return ts.ModuleKind.ES2022;
  }
  return ts.ModuleKind.ES2020;
}
function getTargetFromNodeVersion(ts) {
  if (NODE_VERSION >= 20) {
    return ts.ScriptTarget.ESNext;
  }
  if (NODE_VERSION >= 18) {
    return ts.ScriptTarget.ES2022;
  }
  if (NODE_VERSION >= 17) {
    return ts.ScriptTarget.ES2021;
  }
  return ts.ScriptTarget.ES2020;
}

// https://nodejs.org/api/esm.html#esm_loaders

const FILE_WITH_EXT_PATTERN = /\.[a-z]+$/;
async function loadTypeScript() {
  try {
    return (await import('typescript')).default;
  } catch {
    return null;
  }
}
async function transform(url, source) {
  const ts = await loadTypeScript();
  if (!ts) {
    throw new Error(`\`typescript\` package required for transforming file "${url}".`);
  }
  const nodeNext = isNodeNext(url);
  return ts.transpileModule(String(source), {
    compilerOptions: _objectSpread(_objectSpread({}, COMPILER_OPTIONS), {}, {
      module: getModuleFromNodeVersion(ts, nodeNext),
      moduleResolution: nodeNext ? ts.ModuleResolutionKind.NodeNext : ts.ModuleResolutionKind.Node16,
      resolveJsonModule: false,
      target: getTargetFromNodeVersion(ts)
    }),
    fileName: url
  }).outputText;
}
const initialize = () => {};
const resolve = (specifier, context, nextResolve) => {
  if (isTypeScript(specifier)) {
    return {
      shortCircuit: true,
      url: new URL(specifier, context.parentURL).href
    };
  }

  // Relative import doesn't have an extension, so attempt to find a TS file
  if (specifier.startsWith('.') && !FILE_WITH_EXT_PATTERN.test(specifier)) {
    for (const ext of ['.ts', '.tsx', '.cts', '.mts']) {
      const url = new URL(specifier + ext, context.parentURL);
      if (fs.existsSync(url)) {
        return {
          format: 'module',
          shortCircuit: true,
          url: url.href
        };
      }
    }
  }
  return nextResolve(specifier, context);
};
const load = async (url, context, nextLoad) => {
  if (isTypeScript(url)) {
    const source = await transform(url, await fs.promises.readFile(fileURLToPath(url), 'utf8'));
    return {
      format: 'module',
      shortCircuit: true,
      source
    };
  }
  return nextLoad(url, context);
};
export { initialize, load, resolve };
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