chore: remove p-limit types (#645)

Author: kjin

package.json

@@ -33,7 +33,6 @@
     "@types/ncp": "^2.0.1",
     "@types/nock": "^9.1.0",
     "@types/node": "~10.12.0",
-    "@types/p-limit": "^2.0.0",
     "@types/pify": "^3.0.2",
     "@types/proxyquire": "^1.3.28",
     "@types/request": "^2.48.1",
@@ -70,7 +69,7 @@
     "findit2": "^2.2.3",
     "gcp-metadata": "^1.0.0",
     "lodash.pickby": "^4.6.0",
-    "p-limit": "^2.0.0",
+    "p-limit": "^2.2.0",
     "pify": "^4.0.1",
     "semver": "^5.5.0",
     "source-map": "^0.6.1",

src/agent/io/sourcemapper.ts

@@ -15,14 +15,13 @@
  */
 
 import * as fs from 'fs';
+import pLimit from 'p-limit';
 import * as path from 'path';
 import * as promisify from 'pify';
 import * as sourceMap from 'source-map';
 
 import {findScriptsFuzzy} from '../util/utils';
 
-import pLimit = require('p-limit');
-
 const CONCURRENCY = 10;
 const WEBPACK_PREFIX = 'webpack://';
 const readFilep = promisify(fs.readFile);