#23 Do not fetch files referenced by import type construct

Author: klesun

README.md

@@ -23,6 +23,8 @@ export default (composeCont) => {
 };
 ```
 
+I highly recommend you to also use the [@typescript-eslint/consistent-type-imports](https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin/docs/rules/consistent-type-imports.md) eslint rule to make sure that no extra files will be retrieved for type-only imports 
+
 The script uses [`typescriptServices.js`](https://github.com/microsoft/TypeScript/blob/master/lib/typescriptServices.d.ts) to parse ts file for dependencies and transpile it to js.
 
 Each file loads about 10-50 milliseconds. Some basic optimization is applied during compilation, like using [web workers](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers) and storing compilation results in [`window.localStorage`](https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage), not sure if it can be optimised further, [would need research](https://github.com/klesun/ts-browser/issues/8).

src/actions/ParseTsModule_sideEffects.js

@@ -131,13 +131,16 @@ org.klesun.tsBrowser.ParseTsModule_sideEffects = ({
  const relPath = statement.moduleSpecifier.text;
  const {importClause = null} = statement;
  const depUrl = addPathToUrl(relPath, fullUrl);
- if (importClause) {
+ if (!importClause) {
+ // leaving a blank line so that stack trace matched original lines
+ tsCodeAfterImports += '\n';
+ } else if (importClause.isTypeOnly) {
+ tsCodeAfterImports += '\n';
+ continue; // ignore `import type ...` statements
+ } else {
  // can be not set in case of side-effectish `import './some/url.css';`
  const assignedValue = 'window[' + JSON.stringify(CACHE_LOADED) + '][' + JSON.stringify(depUrl) + ']';
  jsCodeImports += es6ToDestr(tsCode, importClause) + ' = ' + assignedValue + ';\n';
- } else {
- // leaving a blank line so that stack trace matched original lines
- tsCodeAfterImports += '\n';
  }
  staticDependencies.push({url: depUrl});
  } else {