diff --git a/package-lock.json b/package-lock.json
index 99f77b3..4057e37 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,83 +4,140 @@
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+        "has-flag": "^3.0.0"
+      }
+    },
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-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.8.1.tgz",
-      "integrity": "sha1-aUavLR1lGnsYY7Ux1uWvpBqkTqw=",
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
       "dev": true
     },
     "tslint": {
-      "version": "5.9.1",
-      "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.9.1.tgz",
-      "integrity": "sha1-ElX4ej/1frCw4fDmEKi0dIBGya4=",
-      "dev": true,
-      "requires": {
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-        "builtin-modules": "1.1.1",
-        "chalk": "2.3.0",
-        "commander": "2.13.0",
-        "diff": "3.4.0",
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-        "js-yaml": "3.10.0",
-        "minimatch": "3.0.4",
-        "resolve": "1.5.0",
-        "semver": "5.4.1",
-        "tslib": "1.8.1",
-        "tsutils": "2.16.0"
+      "version": "5.20.0",
+      "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.20.0.tgz",
+      "integrity": "sha512-2vqIvkMHbnx8acMogAERQ/IuINOq6DFqgF8/VDvhEkBqQh/x6SP0Y+OHnKth9/ZcHQSroOZwUQSN18v8KKF0/g==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "builtin-modules": "^1.1.1",
+        "chalk": "^2.3.0",
+        "commander": "^2.12.1",
+        "diff": "^4.0.1",
+        "glob": "^7.1.1",
+        "js-yaml": "^3.13.1",
+        "minimatch": "^3.0.4",
+        "mkdirp": "^0.5.1",
+        "resolve": "^1.3.2",
+        "semver": "^5.3.0",
+        "tslib": "^1.8.0",
+        "tsutils": "^2.29.0"
+      },
+      "dependencies": {
+        "diff": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/diff/-/diff-4.0.1.tgz",
+          "integrity": "sha512-s2+XdvhPCOF01LRQBC8hf4vhbVmI2CGS5aZnxLJlT5FtdhPCDFq80q++zK2KlrVorVDdL5BOGZ/VfLrVtYNF+Q==",
+          "dev": true
+        }
       }
     },
     "tsutils": {
-      "version": "2.16.0",
-      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-2.16.0.tgz",
-      "integrity": "sha512-9Ier/60O7OZRNPiw+or5QAtAY4kQA+WDiO/r6xOYATEyefH9bdfvTRLCxrYnFhQlZfET2vYXKfpr3Vw2BiArZw==",
+      "version": "2.29.0",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-2.29.0.tgz",
+      "integrity": "sha512-g5JVHCIJwzfISaXpXE1qvNalca5Jwob6FjI4AoPlqMusJ6ftFE7IkkFoMhVLRgK+4Kx3gkzb8UZK5t5yTTvEmA==",
       "dev": true,
       "requires": {
-        "tslib": "1.8.1"
+        "tslib": "^1.8.1"
       }
     },
     "type-detect": {
-      "version": "4.0.7",
-      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.7.tgz",
-      "integrity": "sha512-4Rh17pAMVdMWzktddFhISRnUnFIStObtUMNGzDwlA6w/77bmGv3aBbRdCmQR6IjzfkTo9otnW+2K/cDRhKSxDA==",
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
       "dev": true
     },
     "typescript": {
-      "version": "2.6.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.6.2.tgz",
-      "integrity": "sha1-PFtv1/beCRQmkCfwPAlGdY92c6Q=",
+      "version": "3.6.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.6.3.tgz",
+      "integrity": "sha512-N7bceJL1CtRQ2RiG0AQME13ksR7DiuQh/QehubYcghzv20tnh+MQnQIuJddTmsbqYj+dztchykemz0zFzlvdQw==",
+      "dev": true
+    },
+    "which": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "dev": true,
+      "requires": {
+        "isexe": "^2.0.0"
+      }
+    },
+    "which-module": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.2 || 2"
+      }
+    },
+    "wrap-ansi": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+      "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
+      "dev": true,
+      "requires": {
+        "ansi-styles": "^3.2.0",
+        "string-width": "^3.0.0",
+        "strip-ansi": "^5.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
+    },
+    "y18n": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "dev": true
+    },
+    "yargs": {
+      "version": "13.3.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
+      "integrity": "sha512-2eehun/8ALW8TLoIl7MVaRUrg+yCnenu8B4kBlRxj3GJGDKU1Og7sMXPNm1BYyM1DOJmTZ4YeN/Nwxv+8XJsUA==",
+      "dev": true,
+      "requires": {
+        "cliui": "^5.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.1.1"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "13.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
+      "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    },
+    "yargs-unparser": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
+      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
+      "dev": true,
+      "requires": {
+        "flat": "^4.1.0",
+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 81fe5c5..2e2955e 100644
--- a/package.json
+++ b/package.json
@@ -10,17 +10,17 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "@types/chai": "^4.1.1",
-    "@types/mocha": "^2.2.46",
-    "@types/node": "^9.3.0",
-    "@types/sinon": "^4.1.3",
-    "chai": "^4.1.2",
-    "mocha": "^5.0.0",
-    "rollup": "^0.54.0",
-    "rollup-plugin-typescript": "^0.8.1",
-    "sinon": "^4.2.0",
-    "tslint": "^5.9.1",
-    "typescript": "^2.6.2"
+    "@types/chai": "^4.2.3",
+    "@types/mocha": "^5.2.7",
+    "@types/node": "^12.7.8",
+    "@types/sinon": "^7.0.13",
+    "chai": "^4.2.0",
+    "mocha": "^6.2.1",
+    "rollup": "^1.22.0",
+    "rollup-plugin-typescript": "^1.0.1",
+    "sinon": "^7.5.0",
+    "tslint": "^5.20.0",
+    "typescript": "^3.6.3"
   },
   "scripts": {
     "clean": "rm -rf lib",
diff --git a/src/reader.ts b/src/reader.ts
index 8ac3412..038b25e 100644
--- a/src/reader.ts
+++ b/src/reader.ts
@@ -11,7 +11,7 @@ export abstract class Reader {
       blobType = 'application/octet-stream';
     }
 
-    const data = this.read(length, position);
+    const data = await this.read(length, position);
 
     return new Blob([data], { type: blobType });
   }
diff --git a/src/reader/nativeFile.ts b/src/reader/nativeFile.ts
index add2ce9..9241a7a 100644
--- a/src/reader/nativeFile.ts
+++ b/src/reader/nativeFile.ts
@@ -27,7 +27,7 @@ export class NativeFileReader extends Reader {
 
     return new Promise<ArrayBuffer>((resolve, reject) => {
       fr.addEventListener('load', () => {
-        resolve(fr.result);
+        resolve(fr.result as ArrayBuffer);
       });
 
       fr.addEventListener('error', () => {
diff --git a/src/test/reader/local_test.ts b/src/test/reader/local_test.ts
index b704cf9..e8ed2c0 100644
--- a/src/test/reader/local_test.ts
+++ b/src/test/reader/local_test.ts
@@ -5,7 +5,8 @@ import * as path from 'path';
 const testFile = path.join(__dirname, '../../../src/test/static/nothing.txt');
 const fakeFile = path.join(__dirname, '../../../src/test/static/doesnt_exist');
 const abToString = (buf: ArrayBuffer) => {
-  return String.fromCharCode.apply(null, new Uint8Array(buf));
+  return String.fromCharCode.apply(null,
+    new Uint8Array(buf) as unknown as number[]);
 };
 
 suite('LocalReader', () => {
diff --git a/src/test/reader/uri_test.ts b/src/test/reader/uri_test.ts
index 3fa1c06..4b72ae8 100644
--- a/src/test/reader/uri_test.ts
+++ b/src/test/reader/uri_test.ts
@@ -4,7 +4,8 @@ import { UriReader } from '../../reader/uri';
 import * as sinon from 'sinon';
 
 const abToString = (buf: ArrayBuffer) => {
-  return String.fromCharCode.apply(null, new Uint8Array(buf));
+  return String.fromCharCode.apply(null,
+    new Uint8Array(buf) as unknown as number[]);
 };
 
 class MockHeaders {