Use user's typescript first, fallback to bundled (#741)

* use process.cwd()'s typescript

* use process.argv[1]'s instead of process.cwd()'s typescript

* Handle situation that argv1 is empty

* changeset

* Require "typescript" from cwd i.o. argv1

Author: whitetrefoil

.changeset/silver-guests-brake.md

@@ -0,0 +1,5 @@
+---
+'microbundle': minor
+---
+
+Use user's typescript first, fallback to bundled

package-lock.json

@@ -104,6 +104,7 @@
 		"lodash.merge": "^4.6.2",
 		"module-details-from-path": "^1.0.3",
 		"pretty-bytes": "^5.3.0",
+		"resolve-from": "^4.0.0",
 		"rollup": "^1.32.1",
 		"rollup-plugin-bundle-size": "^1.0.1",
 		"rollup-plugin-es3": "^1.1.0",

package.json

@@ -9,6 +9,7 @@ import autoprefixer from 'autoprefixer';
 import cssnano from 'cssnano';
 import { rollup, watch } from 'rollup';
 import builtinModules from 'builtin-modules';
+import resolveFrom from 'resolve-from';
 import commonjs from '@rollup/plugin-commonjs';
 import babel from '@rollup/plugin-babel';
 import customBabel from './lib/babel-custom';
@@ -486,7 +487,10 @@ function createConfig(options, entry, format, writeMeta) {
 					},
 					useTypescript &&
 						typescript({
-							typescript: require('typescript'),
+							typescript: require(resolveFrom.silent(
+								options.cwd,
+								'typescript',
+							) || 'typescript'),
 							cacheRoot: `./node_modules/.cache/.rts2_cache_${format}`,
 							useTsconfigDeclarationDir: true,
 							tsconfigDefaults: {