diff --git a/.prettierrc b/.prettierrc
index df7e68f4..13eb4006 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -1,5 +1,7 @@
 {
   "semi": false,
   "printWidth": 100,
-  "rules":
+  "rules": {
+
+  }
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2ee68ac3..08be91ab 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 0.4.0
+
+- `devOps` and `cli` namespaces.
+
 ## 0.3.0
 
 - Avocado can detect Azure Dev Ops PR validation and show only relevant errors.
\ No newline at end of file
diff --git a/package.json b/package.json
index bfddf67e..b5bffbd0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@azure/avocado",
-  "version": "0.3.3",
+  "version": "0.4.0",
   "description": "A validator of OpenAPI configurations",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -68,15 +68,15 @@
   "devDependencies": {
     "@types/mocha": "^5.2.6",
     "@types/node": "^11.10.4",
-    "mocha": "^6.0.2",
-    "mocha-junit-reporter": "^1.21.0",
+    "mocha": "^6.1.4",
+    "mocha-junit-reporter": "^1.22.0",
     "mocha-multi-reporters": "^1.1.7",
-    "nyc": "^13.3.0",
-    "prettier": "^1.16.4",
-    "tslint": "^5.15.0",
+    "nyc": "^14.0.0",
+    "prettier": "^1.17.0",
+    "tslint": "^5.16.0",
     "tslint-config-prettier": "^1.18.0",
     "tslint-immutable": "^5.5.2",
     "tslint-plugin-prettier": "^2.0.1",
-    "typescript": "^3.4.2"
+    "typescript": "^3.4.3"
   }
 }
diff --git a/src/dev-ops.ts b/src/dev-ops.ts
index 20f81c59..25bf44a6 100644
--- a/src/dev-ops.ts
+++ b/src/dev-ops.ts
@@ -3,18 +3,30 @@ import * as git from "./git"
 import * as path from "path"
 import * as fs from "@ts-common/fs"
 
-export type FileChangeKind = 'Added'|'Deleted'|'Modified'
+export type FileChangeKind = "Added" | "Deleted" | "Modified"
 
 export type FileChange = {
   readonly kind: FileChangeKind
   readonly path: string
 }
 
+/**
+ * Properties of Pull Request in Azure DevOps CI.
+ */
 export type PullRequestProperties = {
+  // Target Branch, for example `master`.
   readonly targetBranch: string
+
+  // Source Branch, for example `myname/newchanges`.
   readonly sourceBranch: string
+
+  // Working folder for a cloned directory. We can't switch branches in the original Git repository so we use cloned repository.
   readonly workingDir: string
+
+  // Checkout Git branch, for example, it can be `targetBranch` or `sourceBranch`.
   readonly checkout: (branch: string) => Promise<void>
+
+  // The method returns a set of changes between `targetBranch` and `sourceBranch`.
   // tslint:disable-next-line:prettier
   readonly diff: () => Promise<readonly FileChange[]>
 }
@@ -23,13 +35,22 @@ const sourceBranch = "source-b6791c5f-e0a5-49b1-9175-d7fd3e341cb8"
 
 const parseGitFileChangeKind = (line: string) => {
   switch (line[0]) {
-    case "A": return "Added"
-    case "D": return "Deleted"
-    default: return "Modified"
+    case "A":
+      return "Added"
+    case "D":
+      return "Deleted"
+    default:
+      return "Modified"
   }
 }
 
 /**
+ * If the function is called in Azure DevOps CI for a Pull Request, it creates a
+ * clone of the Git repository and returns properties of the Pull Request, such as
+ * `targetBranch` and `sourceBranch`.
+ *
+ * The function returns `undefined` if it's not Azure DevOps CI for a Pull Request.
+ *
  * Currently, the algorithm is recognizing Azure Dev Ops Pull Request if the `env` has
  * `SYSTEM_PULLREQUEST_TARGETBRANCH`. `cwd` should point to the source Git repository.
  */
diff --git a/src/git.ts b/src/git.ts
index a6dfaad3..05e218a0 100644
--- a/src/git.ts
+++ b/src/git.ts
@@ -1,3 +1,4 @@
+// tslint:disable:prettier
 import * as util from "util"
 import * as childProcess from "child_process"
 import * as stringMap from "@ts-common/string-map"
@@ -9,11 +10,9 @@ export type ExecResult = {
   readonly stderr: string
 }
 
-// tslint:disable-next-line:prettier
 export type GenericCommand = stringMap.StringMap<readonly string[]>
 
 export type Command =
-  // tslint:disable-next-line:prettier
   { readonly config: readonly ["user.email" | "user.name", string] } |
   { readonly init: readonly [] } |
   { readonly add: readonly [string] } |
diff --git a/src/index.ts b/src/index.ts
index d0114200..c2502425 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -12,8 +12,7 @@ import * as cli from "./cli"
 import nodeObjectHash = require("node-object-hash")
 import * as devOps from "./dev-ops"
 
-export { createPullRequestProperties, PullRequestProperties } from "./dev-ops"
-export { defaultConfig, Config } from "./cli"
+export { devOps, cli }
 
 export type JsonParseError = {
   readonly code: "JSON_PARSE"