diff --git a/CHANGELOG.md b/CHANGELOG.md
index e5a27a4e7237..1d59feff7afa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,8 +7,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [unreleased]
 
+- [#2162](https://github.com/teambit/bit/pull/2162) - add integration with [librarian](https://github.com/teambit/librarian)
 - [#2178](https://github.com/teambit/bit/issues/2178) fix adding ts types packages to respect overrides settings
-- [#2176](https://github.com/teambit/bit/issues/2176) fix workspace overrides to not leak rules to unrelated components
+- [#2176](https://github.com/teambit/bit/issues/2176) fix workspace overrides to not leak rules to unrelated component
 - [#2171](https://github.com/teambit/bit/issues/2171) fix component-not-found when exporting to multiple scopes and there are dependencies between them
 
 ## [14.6.1-dev.2] - 2019-12-04
diff --git a/components/core/capsule/capsule.ts b/components/core/capsule/capsule.ts
index c427eb187619..de4ace6f46e5 100644
--- a/components/core/capsule/capsule.ts
+++ b/components/core/capsule/capsule.ts
@@ -1,17 +1,20 @@
-import State from "./state";
+import State from './state';
 import Container from './container';
 // @ts-ignore
-import { Volume } from "memfs/lib/volume";
-import Console from "./console";
+import librarian from 'librarian';
+import { Volume } from 'memfs/lib/volume';
+import Console from './console';
 // @ts-ignore
 import { Union } from 'unionfs';
 import { ContainerFS } from './container';
-import { Exec } from "./container";
+import { Exec } from './container';
+
+import loader from '../../../src/cli/loader'; // TODO: better (have the capsule accept the loader as an arg?)
 
 export class ContainerFactoryOptions {
   image: string = '';
   config: object = {};
-};
+}
 
 export default class Capsule {
   constructor(
@@ -41,6 +44,8 @@ export default class Capsule {
    */
   static image = 'ubuntu';
 
+  componentName?: string;
+
   /**
    * default capsule config.
    */
@@ -63,8 +68,8 @@ export default class Capsule {
     this.container.on(event, fn);
   }
 
-  updateFs(fs: {[path: string]: string}, fn: Function): void {
-    Object.keys(fs).forEach((path) => {
+  updateFs(fs: { [path: string]: string }, fn: Function): void {
+    Object.keys(fs).forEach(path => {
       // @ts-ignorex
       this.fs.writeFile(path, fs[path], () => {
         if (Object.keys(fs).length === 1) fn();
@@ -72,6 +77,20 @@ export default class Capsule {
     });
   }
 
+  async execNode(executable: string, args: any) {
+    // TODO: better
+    const loaderPrefix = this.componentName ? `isolating ${this.componentName}` : '';
+    const log = message => (this.componentName ? loader.setText(`${loaderPrefix}: ${message}`) : {});
+    const { patchFileSystem } = librarian.api();
+    const onScriptRun = () =>
+      this.componentName ? loader.setText(`running build for ${this.componentName} in an isolated environment`) : {}; // TODO: do this from the compiler/tester so we can customize the message
+    await patchFileSystem(executable, { args, cwd: this.container.path, log, onScriptRun });
+  }
+
+  setComponentName(componentName: string) {
+    this.componentName = componentName;
+  }
+
   outputFile(file: string, data: any, options: Object): Promise<any> {
     return this.container.outputFile(file, data, options);
   }
@@ -89,7 +108,7 @@ export default class Capsule {
   }
 
   resume() {
-    return this.container.resume()
+    return this.container.resume();
   }
 
   stop() {
@@ -117,21 +136,19 @@ export default class Capsule {
 
   private static buildFs(memFs: Volume, containerFs: ContainerFS): Volume {
     const fs = new Union();
-    fs
-      .use(memFs)
-      .use(containerFs);
+    fs.use(memFs).use(containerFs);
 
     return fs;
   }
 
   static async create<T extends Capsule>(
-      containerFactory: (options: ContainerFactoryOptions) => Promise<Container>,
-      volume: Volume = new Volume(),
-      initialState: State = new State(),
-      console: Console = new Console()
-    ): Promise<T> {
+    containerFactory: (options: ContainerFactoryOptions) => Promise<Container>,
+    volume: Volume = new Volume(),
+    initialState: State = new State(),
+    console: Console = new Console()
+  ): Promise<T> {
     const container = await containerFactory({ image: this.image, config: this.config });
     const fs = await ContainerFS.fromJSON(container, {});
-    return (new this(container, this.buildFs(volume, fs), console, initialState) as T);
+    return new this(container, this.buildFs(volume, fs), console, initialState) as T;
   }
 }
diff --git a/components/core/capsule/container/container.ts b/components/core/capsule/container/container.ts
index b5cb80bb5ad3..50c4e9ed790f 100644
--- a/components/core/capsule/container/container.ts
+++ b/components/core/capsule/container/container.ts
@@ -6,6 +6,7 @@ export default interface Container {
    * container id
    */
   id: string;
+  path: string;
 
   /**
    * execute a command on the container
@@ -20,13 +21,13 @@ export default interface Container {
   /**
    * put a file or a directory to the container.
    */
-  put(files: {[path: string]: string}, options: { overwrite?: boolean, path: string }): Promise<void>;
+  put(files: { [path: string]: string }, options: { overwrite?: boolean; path: string }): Promise<void>;
+
+  on(event: string, fn: (data: any) => void): void;
 
-  on(event: string, fn: (data: any) => void): void; 
-  
   /**
    * start a container.
-   */   
+   */
   start(): Promise<void>;
 
   /**
@@ -69,37 +70,37 @@ export type ContainerStatus = {
   /**
    * array of open container ports
    */
-  ports: number[],
+  ports: number[];
 
   /**
    * container host
    */
-  host: string,
+  host: string;
 };
 
 export type CommitOptions = {
   /**
    * repository name for the created image
    */
-  repo: string,
-  
+  repo: string;
+
   /**
    * tag name for the create image
    */
-  tag: string,
+  tag: string;
 
   /**
    * commit message
    */
-  comment: string,
+  comment: string;
 
   /**
    * author of the image.
    */
-  author: string,
+  author: string;
 
   /**
    * whether to pause the container before committing
    */
-  pause: boolean,
+  pause: boolean;
 };
diff --git a/e2e/commands/isolate.e2e.1.ts b/e2e/commands/isolate.e2e.1.ts
index 13853a63fcd1..36c583fad2db 100644
--- a/e2e/commands/isolate.e2e.1.ts
+++ b/e2e/commands/isolate.e2e.1.ts
@@ -40,7 +40,7 @@ describe('run bit isolate', function() {
     describe('with the same parameters as pack is using', () => {
       let isolatePath;
       before(() => {
-        isolatePath = helper.command.isolateComponent('bar/foo', '-olw');
+        isolatePath = helper.command.isolateComponent('bar/foo', '-owls');
       });
       it('should be able to generate the links correctly and require the dependencies', () => {
         const appJsFixture = `const barFoo = require('./');
diff --git a/e2e/functionalities/custom-module-resolutions.e2e.2.ts b/e2e/functionalities/custom-module-resolutions.e2e.2.ts
index 541b77631fa9..4e1db0e2db5e 100644
--- a/e2e/functionalities/custom-module-resolutions.e2e.2.ts
+++ b/e2e/functionalities/custom-module-resolutions.e2e.2.ts
@@ -91,7 +91,7 @@ describe('custom module resolutions', function() {
       describe('importing the component using isolated environment', () => {
         let isolatePath;
         before(() => {
-          isolatePath = helper.command.isolateComponent('bar/foo', '-olw');
+          isolatePath = helper.command.isolateComponent('bar/foo', '-olws');
         });
         it('should be able to generate the links correctly and require the dependencies', () => {
           const appJsFixture = `const barFoo = require('./');
diff --git a/package-lock.json b/package-lock.json
index 39494f0f9dee..7add04211a2a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,7 @@
+
 {
   "name": "bit-bin",
-  "version": "14.5.0",
+  "version": "14.6.1-dev.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -2190,7 +2191,6 @@
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.5.tgz",
       "integrity": "sha512-E+iruNOY8VV9s4JEbe1aNEm6MiszPRr/UfcHMz0TQh1BXSxHK+ASV1R6W4HpjBhSeS+54PIsAMCBmwD06LLsqQ==",
-      "dev": true,
       "requires": {
         "jsonparse": "^1.2.0",
         "through": ">=2.2.7 <3"
@@ -2514,8 +2514,7 @@
     "assert-plus": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
-      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
-      "dev": true
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
     },
     "assertion-error": {
       "version": "1.1.0",
@@ -2569,8 +2568,7 @@
     "asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
-      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
-      "dev": true
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k="
     },
     "atob": {
       "version": "2.1.2",
@@ -2586,14 +2584,12 @@
     "aws-sign2": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
-      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
-      "dev": true
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg="
     },
     "aws4": {
       "version": "1.8.0",
       "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.8.0.tgz",
-      "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==",
-      "dev": true
+      "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ=="
     },
     "babel-eslint": {
       "version": "9.0.0",
@@ -2697,7 +2693,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
       "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
-      "dev": true,
       "requires": {
         "tweetnacl": "^0.14.3"
       }
@@ -3077,8 +3072,7 @@
     "caseless": {
       "version": "0.12.0",
       "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
-      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
-      "dev": true
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw="
     },
     "chai": {
       "version": "4.2.0",
@@ -3154,8 +3148,7 @@
     "charenc": {
       "version": "0.0.2",
       "resolved": "https://registry.npmjs.org/charenc/-/charenc-0.0.2.tgz",
-      "integrity": "sha1-wKHS86cJLgN3S/qD8UwPxXkKhmc=",
-      "dev": true
+      "integrity": "sha1-wKHS86cJLgN3S/qD8UwPxXkKhmc="
     },
     "check-error": {
       "version": "1.0.2",
@@ -3454,7 +3447,6 @@
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
       "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
-      "dev": true,
       "requires": {
         "delayed-stream": "~1.0.0"
       }
@@ -3756,8 +3748,7 @@
     "crypt": {
       "version": "0.0.2",
       "resolved": "https://registry.npmjs.org/crypt/-/crypt-0.0.2.tgz",
-      "integrity": "sha1-iNf/fsDfuG9xPch7u0LQRNPmxBs=",
-      "dev": true
+      "integrity": "sha1-iNf/fsDfuG9xPch7u0LQRNPmxBs="
     },
     "crypto-random-string": {
       "version": "1.0.0",
@@ -3871,7 +3862,6 @@
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
       "integrity": "sha1-hTz6D3y+L+1d4gMmuN1YEDX24vA=",
-      "dev": true,
       "requires": {
         "assert-plus": "^1.0.0"
       }
@@ -4033,8 +4023,7 @@
     "delayed-stream": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
-      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
-      "dev": true
+      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk="
     },
     "depd": {
       "version": "1.1.2",
@@ -4203,11 +4192,15 @@
         }
       }
     },
+    "easy-stack": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/easy-stack/-/easy-stack-1.0.0.tgz",
+      "integrity": "sha1-EskbMIWjfwuqM26UhurEv5Tj54g="
+    },
     "ecc-jsbn": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz",
       "integrity": "sha1-OoOpBOVDUyh4dMVkt1SThoSamMk=",
-      "dev": true,
       "requires": {
         "jsbn": "~0.1.0",
         "safer-buffer": "^2.1.0"
@@ -5049,6 +5042,11 @@
         "es5-ext": "~0.10.14"
       }
     },
+    "event-pubsub": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/event-pubsub/-/event-pubsub-4.3.0.tgz",
+      "integrity": "sha512-z7IyloorXvKbFx9Bpie2+vMJKKx1fH1EN5yiTfp8CiLOTptSYy1g8H4yDpGlEdshL1PBiFtBHepF2cNsqeEeFQ=="
+    },
     "execa": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/execa/-/execa-2.0.4.tgz",
@@ -5277,8 +5275,7 @@
     "extsprintf": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.3.0.tgz",
-      "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU=",
-      "dev": true
+      "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU="
     },
     "eyes": {
       "version": "0.1.8",
@@ -5518,17 +5515,49 @@
         "for-in": "^1.0.1"
       }
     },
+    "foreground-child": {
+      "version": "1.5.6",
+      "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-1.5.6.tgz",
+      "integrity": "sha1-T9ca0t/elnibmApcCilZN8svXOk=",
+      "requires": {
+        "cross-spawn": "^4",
+        "signal-exit": "^3.0.0"
+      },
+      "dependencies": {
+        "cross-spawn": {
+          "version": "4.0.2",
+          "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-4.0.2.tgz",
+          "integrity": "sha1-e5JHYhwjrf3ThWAEqCPL45dCTUE=",
+          "requires": {
+            "lru-cache": "^4.0.1",
+            "which": "^1.2.9"
+          }
+        },
+        "lru-cache": {
+          "version": "4.1.5",
+          "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.1.5.tgz",
+          "integrity": "sha512-sWZlbEP2OsHNkXrMl5GYk/jKk70MBng6UU4YI/qGDYbgf6YbP4EvmqISbXCoJiRKs+1bSpFHVgQxvJ17F2li5g==",
+          "requires": {
+            "pseudomap": "^1.0.2",
+            "yallist": "^2.1.2"
+          }
+        },
+        "yallist": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+          "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI="
+        }
+      }
+    },
     "forever-agent": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/forever-agent/-/forever-agent-0.6.1.tgz",
-      "integrity": "sha1-+8cfDEGt6zf5bFd60e1C2P2sypE=",
-      "dev": true
+      "integrity": "sha1-+8cfDEGt6zf5bFd60e1C2P2sypE="
     },
     "form-data": {
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.3.3.tgz",
       "integrity": "sha512-1lLKB2Mu3aGP1Q/2eCOx0fNbRMe7XdwktwOruhfqqd0rIJWwN4Dh+E3hrPSlDCXnSR7UtZ1N38rVXm+6+MEhJQ==",
-      "dev": true,
       "requires": {
         "asynckit": "^0.4.0",
         "combined-stream": "^1.0.6",
@@ -5600,7 +5629,6 @@
       "version": "1.2.6",
       "resolved": "https://registry.npmjs.org/fs-minipass/-/fs-minipass-1.2.6.tgz",
       "integrity": "sha512-crhvyXcMejjv3Z5d2Fa9sf5xLYVCF5O1c71QxbVnbLsmYMBEvDAftewesN/HhY03YRoA7zOMxjNGrF5svGaaeQ==",
-      "dev": true,
       "requires": {
         "minipass": "^2.2.1"
       }
@@ -5709,6 +5737,11 @@
         }
       }
     },
+    "genfun": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/genfun/-/genfun-5.0.0.tgz",
+      "integrity": "sha512-KGDOARWVga7+rnB3z9Sd2Letx515owfk0hSxHGuqjANb1M+x2bGZGqHLiozPsYMdM2OubeMni/Hpwmjq6qIUhA=="
+    },
     "get-amd-module-type": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/get-amd-module-type/-/get-amd-module-type-3.0.0.tgz",
@@ -5751,7 +5784,6 @@
       "version": "0.1.7",
       "resolved": "https://registry.npmjs.org/getpass/-/getpass-0.1.7.tgz",
       "integrity": "sha1-Xv+OPmhNVprkyysSgmBOi6YhSfo=",
-      "dev": true,
       "requires": {
         "assert-plus": "^1.0.0"
       }
@@ -6029,14 +6061,12 @@
     "har-schema": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",
-      "integrity": "sha1-qUwiJOvKwEeCoNkDVSHyRzW37JI=",
-      "dev": true
+      "integrity": "sha1-qUwiJOvKwEeCoNkDVSHyRzW37JI="
     },
     "har-validator": {
       "version": "5.1.3",
       "resolved": "https://registry.npmjs.org/har-validator/-/har-validator-5.1.3.tgz",
       "integrity": "sha512-sNvOCzEQNr/qrvJgc3UG/kD4QtlHycrzwS+6mfTrrSq97BvaYcPZZI1ZSqGSPR73Cxn4LKTD4PttRwfU7jWq5g==",
-      "dev": true,
       "requires": {
         "ajv": "^6.5.5",
         "har-schema": "^2.0.0"
@@ -6167,8 +6197,7 @@
     "hosted-git-info": {
       "version": "2.8.4",
       "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.8.4.tgz",
-      "integrity": "sha512-pzXIvANXEFrc5oFFXRMkbLPQ2rXRoDERwDLyrcUxGhaZhgP54BBSl9Oheh7Vv0T090cszWBxPjkQQ5Sq1PbBRQ==",
-      "dev": true
+      "integrity": "sha512-pzXIvANXEFrc5oFFXRMkbLPQ2rXRoDERwDLyrcUxGhaZhgP54BBSl9Oheh7Vv0T090cszWBxPjkQQ5Sq1PbBRQ=="
     },
     "html-encoding-sniffer": {
       "version": "1.0.2",
@@ -6220,7 +6249,6 @@
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/http-signature/-/http-signature-1.2.0.tgz",
       "integrity": "sha1-muzZJRFHcvPZW2WmCruPfBj7rOE=",
-      "dev": true,
       "requires": {
         "assert-plus": "^1.0.0",
         "jsprim": "^1.2.2",
@@ -6355,6 +6383,14 @@
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-3.3.10.tgz",
       "integrity": "sha512-Pgs951kaMm5GXP7MOvxERINe3gsaVjUWFm+UZPSq9xYriQAksyhg0csnS0KXSNRD5NmNdapXEpjxG49+AKh/ug=="
     },
+    "ignore-walk": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/ignore-walk/-/ignore-walk-3.0.3.tgz",
+      "integrity": "sha512-m7o6xuOaT1aqheYHKf8W6J5pYH85ZI9w077erOzLje3JsB1gkafkAhHHY19dqjulgIZHFm32Cp5uNZgcQqdJKw==",
+      "requires": {
+        "minimatch": "^3.0.4"
+      }
+    },
     "import-fresh": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-2.0.0.tgz",
@@ -6410,6 +6446,11 @@
       "resolved": "https://registry.npmjs.org/indexes-of/-/indexes-of-1.0.1.tgz",
       "integrity": "sha1-8w9xbI4r00bHtn0985FVZqfAVgc="
     },
+    "infer-owner": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/infer-owner/-/infer-owner-1.0.4.tgz",
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-      "dev": true
+      "integrity": "sha512-fexhUFFPTGV8ybAtSIGbV6gOkSv8UtRbDBnAyLQw4QPKkgNlsH2ByPGtMUqdWkos6YCRmAqViwgZrJc/mRDzZQ=="
     },
     "object-assign": {
       "version": "4.1.1",
@@ -9112,6 +9391,15 @@
       "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
       "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ="
     },
+    "osenv": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/osenv/-/osenv-0.1.5.tgz",
+      "integrity": "sha512-0CWcCECdMVc2Rw3U5w9ZjqX6ga6ubk1xDVKxtBQPK7wis/0F2r9T6k4ydGYhecl7YUBxBVxhL5oisPsNxAPe2g==",
+      "requires": {
+        "os-homedir": "^1.0.0",
+        "os-tmpdir": "^1.0.0"
+      }
+    },
     "output-file-sync": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/output-file-sync/-/output-file-sync-2.0.1.tgz",
@@ -9227,6 +9515,114 @@
         "optimist": "~0.6.0"
       }
     },
+    "pacote": {
+      "version": "9.5.10",
+      "resolved": "https://registry.npmjs.org/pacote/-/pacote-9.5.10.tgz",
+      "integrity": "sha512-YfMv9yyUFojekkPB4x2pL7DvAaQ5KF+XObfrhNBreXkLopo9k9nOPszObZ4V7ORoLsaFq4ZaK851JxfJxfpfAg==",
+      "requires": {
+        "bluebird": "^3.5.3",
+        "cacache": "^12.0.2",
+        "chownr": "^1.1.2",
+        "figgy-pudding": "^3.5.1",
+        "get-stream": "^4.1.0",
+        "glob": "^7.1.3",
+        "infer-owner": "^1.0.4",
+        "lru-cache": "^5.1.1",
+        "make-fetch-happen": "^5.0.0",
+        "minimatch": "^3.0.4",
+        "minipass": "^2.3.5",
+        "mississippi": "^3.0.0",
+        "mkdirp": "^0.5.1",
+        "normalize-package-data": "^2.4.0",
+        "npm-package-arg": "^6.1.0",
+        "npm-packlist": "^1.1.12",
+        "npm-pick-manifest": "^3.0.0",
+        "npm-registry-fetch": "^4.0.0",
+        "osenv": "^0.1.5",
+        "promise-inflight": "^1.0.1",
+        "promise-retry": "^1.1.1",
+        "protoduck": "^5.0.1",
+        "rimraf": "^2.6.2",
+        "safe-buffer": "^5.1.2",
+        "semver": "^5.6.0",
+        "ssri": "^6.0.1",
+        "tar": "^4.4.10",
+        "unique-filename": "^1.1.1",
+        "which": "^1.3.1"
+      },
+      "dependencies": {
+        "cacache": {
+          "version": "12.0.3",
+          "resolved": "https://registry.npmjs.org/cacache/-/cacache-12.0.3.tgz",
+          "integrity": "sha512-kqdmfXEGFepesTuROHMs3MpFLWrPkSSpRqOw80RCflZXy/khxaArvFrQ7uJxSUduzAufc6G0g1VUCOZXxWavPw==",
+          "requires": {
+            "bluebird": "^3.5.5",
+            "chownr": "^1.1.1",
+            "figgy-pudding": "^3.5.1",
+            "glob": "^7.1.4",
+            "graceful-fs": "^4.1.15",
+            "infer-owner": "^1.0.3",
+            "lru-cache": "^5.1.1",
+            "mississippi": "^3.0.0",
+            "mkdirp": "^0.5.1",
+            "move-concurrently": "^1.0.1",
+            "promise-inflight": "^1.0.1",
+            "rimraf": "^2.6.3",
+            "ssri": "^6.0.1",
+            "unique-filename": "^1.1.1",
+            "y18n": "^4.0.0"
+          }
+        },
+        "debug": {
+          "version": "3.2.6",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
+          "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "get-stream": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-4.1.0.tgz",
+          "integrity": "sha512-GMat4EJ5161kIy2HevLlr4luNjBgvmj413KaQA7jt4V8B4RDsfpHk7WQ9GVqfYyyx8OS/L66Kox+rJRNklLK7w==",
+          "requires": {
+            "pump": "^3.0.0"
+          }
+        },
+        "https-proxy-agent": {
+          "version": "2.2.4",
+          "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-2.2.4.tgz",
+          "integrity": "sha512-OmvfoQ53WLjtA9HeYP9RNrWMJzzAz1JGaSFr1nijg0PVR1JaD/xbJq1mdEIIlxGpXp9eSe/O2LgU9DJmTPd0Eg==",
+          "requires": {
+            "agent-base": "^4.3.0",
+            "debug": "^3.1.0"
+          }
+        },
+        "make-fetch-happen": {
+          "version": "5.0.2",
+          "resolved": "https://registry.npmjs.org/make-fetch-happen/-/make-fetch-happen-5.0.2.tgz",
+          "integrity": "sha512-07JHC0r1ykIoruKO8ifMXu+xEU8qOXDFETylktdug6vJDACnP+HKevOu3PXyNPzFyTSlz8vrBYlBO1JZRe8Cag==",
+          "requires": {
+            "agentkeepalive": "^3.4.1",
+            "cacache": "^12.0.0",
+            "http-cache-semantics": "^3.8.1",
+            "http-proxy-agent": "^2.1.0",
+            "https-proxy-agent": "^2.2.3",
+            "lru-cache": "^5.1.1",
+            "mississippi": "^3.0.0",
+            "node-fetch-npm": "^2.0.2",
+            "promise-retry": "^1.1.1",
+            "socks-proxy-agent": "^4.0.0",
+            "ssri": "^6.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
+        }
+      }
+    },
     "pad": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/pad/-/pad-3.2.0.tgz",
@@ -9410,8 +9806,7 @@
     "performance-now": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
-      "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=",
-      "dev": true
+      "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns="
     },
     "picomatch": {
       "version": "2.0.7",
@@ -9736,6 +10131,14 @@
         "to-property-key-x": "^2.0.1"
       }
     },
+    "protoduck": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/protoduck/-/protoduck-5.0.1.tgz",
+      "integrity": "sha512-WxoCeDCoCBY55BMvj4cAEjdVUFGRWed9ZxPlqTKYyw1nDDTQ4pqmnIMAGfJlg7Dx35uB/M+PHJPTmGOvaCaPTg==",
+      "requires": {
+        "genfun": "^5.0.0"
+      }
+    },
     "proxy-addr": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.5.tgz",
@@ -9754,14 +10157,12 @@
     "pseudomap": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/pseudomap/-/pseudomap-1.0.2.tgz",
-      "integrity": "sha1-8FKijacOYYkX7wqKw0wa5aaChrM=",
-      "dev": true
+      "integrity": "sha1-8FKijacOYYkX7wqKw0wa5aaChrM="
     },
     "psl": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/psl/-/psl-1.4.0.tgz",
-      "integrity": "sha512-HZzqCGPecFLyoRj5HLfuDSKYTJkAfB5thKBIkRHtGjWwY7p1dAyveIbXIq4tO0KYfDF2tHqPUgY9SDnGm00uFw==",
-      "dev": true
+      "integrity": "sha512-HZzqCGPecFLyoRj5HLfuDSKYTJkAfB5thKBIkRHtGjWwY7p1dAyveIbXIq4tO0KYfDF2tHqPUgY9SDnGm00uFw=="
     },
     "pump": {
       "version": "3.0.0",
@@ -9806,8 +10207,7 @@
     "qs": {
       "version": "6.5.2",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.2.tgz",
-      "integrity": "sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==",
-      "dev": true
+      "integrity": "sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA=="
     },
     "ramda": {
       "version": "0.24.1",
@@ -10144,7 +10544,6 @@
       "version": "2.88.0",
       "resolved": "https://registry.npmjs.org/request/-/request-2.88.0.tgz",
       "integrity": "sha512-NAqBSrijGLZdM0WZNsInLJpkJokL72XYjUpnB0iwsRgxh7dB6COrHnTBNwN0E+lHDAJzu7kLAkDeY08z2/A0hg==",
-      "dev": true,
       "requires": {
         "aws-sign2": "~0.7.0",
         "aws4": "^1.8.0",
@@ -10178,11 +10577,31 @@
         "request": "2.88.0"
       }
     },
+    "request-promise": {
+      "version": "4.2.5",
+      "resolved": "https://registry.npmjs.org/request-promise/-/request-promise-4.2.5.tgz",
+      "integrity": "sha512-ZgnepCykFdmpq86fKGwqntyTiUrHycALuGggpyCZwMvGaZWgxW6yagT0FHkgo5LzYvOaCNvxYwWYIjevSH1EDg==",
+      "requires": {
+        "bluebird": "^3.5.0",
+        "request-promise-core": "1.1.3",
+        "stealthy-require": "^1.1.1",
+        "tough-cookie": "^2.3.3"
+      },
+      "dependencies": {
+        "request-promise-core": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/request-promise-core/-/request-promise-core-1.1.3.tgz",
+          "integrity": "sha512-QIs2+ArIGQVp5ZYbWD5ZLCY29D5CfWizP8eWnm8FoGD1TX61veauETVQbrV60662V0oFBkrDOuaBI8XgtuyYAQ==",
+          "requires": {
+            "lodash": "^4.17.15"
+          }
+        }
+      }
+    },
     "request-promise-core": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/request-promise-core/-/request-promise-core-1.1.2.tgz",
       "integrity": "sha512-UHYyq1MO8GsefGEt7EprS8UrXsm1TxEvFUX1IMTuSLU2Rh7fTIdFtl8xD7JiEYiWU2dl+NYAjCTksTehQUxPag==",
-      "dev": true,
       "requires": {
         "lodash": "^4.17.11"
       }
@@ -10191,7 +10610,6 @@
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/request-promise-native/-/request-promise-native-1.0.7.tgz",
       "integrity": "sha512-rIMnbBdgNViL37nZ1b3L/VfPOpSi0TqVDQPAvO6U14lMzOLrt5nilxCQqtDKhZeDiW0/hkCXGoQjhgJd/tCh6w==",
-      "dev": true,
       "requires": {
         "request-promise-core": "1.1.2",
         "stealthy-require": "^1.1.1",
@@ -10809,11 +11227,23 @@
       "integrity": "sha1-PpNdfd1zYxuXZZlW1VEo6HtQhKM=",
       "dev": true
     },
+    "spawn-wrap": {
+      "version": "1.4.3",
+      "resolved": "https://registry.npmjs.org/spawn-wrap/-/spawn-wrap-1.4.3.tgz",
+      "integrity": "sha512-IgB8md0QW/+tWqcavuFgKYR/qIRvJkRLPJDFaoXtLLUaVcCDK0+HeFTkmQHj3eprcYhc+gOl0aEA1w7qZlYezw==",
+      "requires": {
+        "foreground-child": "^1.5.6",
+        "mkdirp": "^0.5.0",
+        "os-homedir": "^1.0.1",
+        "rimraf": "^2.6.2",
+        "signal-exit": "^3.0.2",
+        "which": "^1.3.0"
+      }
+    },
     "spdx-correct": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.1.0.tgz",
       "integrity": "sha512-lr2EZCctC2BNR7j7WzJ2FpDznxky1sjfxvvYEyzxNyb6lZXHODmEoJeFu4JupYlkfha1KZpJyoqiJ7pgA1qq8Q==",
-      "dev": true,
       "requires": {
         "spdx-expression-parse": "^3.0.0",
         "spdx-license-ids": "^3.0.0"
@@ -10822,14 +11252,12 @@
     "spdx-exceptions": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.2.0.tgz",
-      "integrity": "sha512-2XQACfElKi9SlVb1CYadKDXvoajPgBVPn/gOQLrTvHdElaVhr7ZEbqJaRnJLVNeaI4cMEAgVCeBMKF6MWRDCRA==",
-      "dev": true
+      "integrity": "sha512-2XQACfElKi9SlVb1CYadKDXvoajPgBVPn/gOQLrTvHdElaVhr7ZEbqJaRnJLVNeaI4cMEAgVCeBMKF6MWRDCRA=="
     },
     "spdx-expression-parse": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-3.0.0.tgz",
       "integrity": "sha512-Yg6D3XpRD4kkOmTpdgbUiEJFKghJH03fiC1OPll5h/0sO6neh2jqRDVHOQ4o/LMea0tgCkbMgea5ip/e+MkWyg==",
-      "dev": true,
       "requires": {
         "spdx-exceptions": "^2.1.0",
         "spdx-license-ids": "^3.0.0"
@@ -10838,8 +11266,7 @@
     "spdx-license-ids": {
       "version": "3.0.5",
       "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.5.tgz",
-      "integrity": "sha512-J+FWzZoynJEXGphVIS+XEh3kFSjZX/1i9gFBaWQcB+/tmpe2qUsSBABpcxqxnAxFdiUFEgAX1bjYGQvIZmoz9Q==",
-      "dev": true
+      "integrity": "sha512-J+FWzZoynJEXGphVIS+XEh3kFSjZX/1i9gFBaWQcB+/tmpe2qUsSBABpcxqxnAxFdiUFEgAX1bjYGQvIZmoz9Q=="
     },
     "speedometer": {
       "version": "1.0.0",
@@ -10883,7 +11310,6 @@
       "version": "1.16.1",
       "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.16.1.tgz",
       "integrity": "sha512-HXXqVUq7+pcKeLqqZj6mHFUMvXtOJt1uoUx09pFW6011inTMxqI8BA8PM95myrIyyKwdnzjdFjLiE6KBPVtJIg==",
-      "dev": true,
       "requires": {
         "asn1": "~0.2.3",
         "assert-plus": "^1.0.0",
@@ -10945,8 +11371,7 @@
     "stealthy-require": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/stealthy-require/-/stealthy-require-1.1.1.tgz",
-      "integrity": "sha1-NbCYdbT/SfJqd35QmzCQoyJr8ks=",
-      "dev": true
+      "integrity": "sha1-NbCYdbT/SfJqd35QmzCQoyJr8ks="
     },
     "stream-each": {
       "version": "1.2.3",
@@ -11252,7 +11677,6 @@
       "version": "4.4.10",
       "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.10.tgz",
       "integrity": "sha512-g2SVs5QIxvo6OLp0GudTqEf05maawKUxXru104iaayWA09551tFCTI8f1Asb4lPfkBr91k07iL4c11XO3/b0tA==",
-      "dev": true,
       "requires": {
         "chownr": "^1.1.1",
         "fs-minipass": "^1.2.5",
@@ -11586,7 +12010,6 @@
       "version": "2.4.3",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.4.3.tgz",
       "integrity": "sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==",
-      "dev": true,
       "requires": {
         "psl": "^1.1.24",
         "punycode": "^1.4.1"
@@ -11595,8 +12018,7 @@
         "punycode": {
           "version": "1.4.1",
           "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
-          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
-          "dev": true
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4="
         }
       }
     },
@@ -11708,7 +12130,6 @@
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
       "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
-      "dev": true,
       "requires": {
         "safe-buffer": "^5.0.1"
       }
@@ -11716,8 +12137,7 @@
     "tweetnacl": {
       "version": "0.14.5",
       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
-      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-      "dev": true
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q="
     },
     "type": {
       "version": "1.0.3",
@@ -12088,7 +12508,6 @@
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
       "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
-      "dev": true,
       "requires": {
         "spdx-correct": "^3.0.0",
         "spdx-expression-parse": "^3.0.0"
@@ -12296,7 +12715,6 @@
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
       "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
-      "dev": true,
       "requires": {
         "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
diff --git a/package.json b/package.json
index 73943480448d..d8155d6e4804 100644
--- a/package.json
+++ b/package.json
@@ -112,6 +112,7 @@
     "is-glob": "^4.0.0",
     "isbinaryfile": "^4.0.2",
     "jfs": "^0.2.6",
+    "librarian": "github:teambit/librarian#release",
     "lodash.assignwith": "^4.2.0",
     "lodash.groupby": "^4.6.0",
     "lodash.merge": "^4.6.2",
diff --git a/src/app.ts b/src/app.ts
index 4c728cbdee52..d1b957c93e45 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -4,6 +4,8 @@ import buildRegistrar from './cli/command-registrar-builder';
 import loadExtensions from './extensions/extensions-loader';
 import HooksManager from './hooks';
 
+process.env.MEMFS_DONT_WARN = 'true'; // suppress fs experimental warnings from memfs
+
 // removing this, default to longStackTraces also when env is `development`, which impacts the
 // performance dramatically. (see http://bluebirdjs.com/docs/api/promise.longstacktraces.html)
 Promise.config({
diff --git a/src/cli/commands/public-cmds/isolate-cmd.ts b/src/cli/commands/public-cmds/isolate-cmd.ts
index 8552a9543f9f..af50c7c39fd3 100644
--- a/src/cli/commands/public-cmds/isolate-cmd.ts
+++ b/src/cli/commands/public-cmds/isolate-cmd.ts
@@ -11,7 +11,7 @@ export default class Isolate extends Command {
     ['d', 'directory [directory] ', 'path to store isolated component'],
     ['w', 'write-bit-dependencies [boolean] ', 'write bit components dependencies to package.json file'],
     ['l', 'npm-links [boolean]', 'point dependencies link files to npm package'],
-    ['i', 'install-packages [boolean]', 'install npm package dependencies'],
+    ['s', 'skip-npm-install [boolean]', 'do not install npm package dependencies'],
     ['', 'install-peer-dependencies [boolean]', 'install peer npm package dependencies'],
     ['', 'dist', 'write dist files (when exist) to the configured directory'],
     ['', 'conf', 'write the configuration file (bit.json)'],
@@ -40,7 +40,7 @@ export default class Isolate extends Command {
       directory?: string;
       writeBitDependencies?: boolean;
       npmLinks?: boolean;
-      installPackages?: boolean;
+      skipNpmInstall?: boolean;
       installPeerDependencies?: boolean;
       dist?: boolean;
       conf?: boolean;
@@ -53,9 +53,6 @@ export default class Isolate extends Command {
       useCapsule?: boolean;
     }
   ): Promise<any> {
-    // console.log('im here');
-    // console.log(opts);
-    // return '';
     const concreteOpts: WorkspaceIsolateOptions = {
       writeToPath: opts.directory,
       override: opts.override === true,
@@ -65,8 +62,8 @@ export default class Isolate extends Command {
       createNpmLinkFiles: opts.npmLinks === true,
       saveDependenciesAsComponents: opts.saveDependenciesAsComponents !== false,
       writeDists: opts.dist === true,
-      installNpmPackages: !!opts.installPackages, // convert to boolean
-      installPeerDependencies: !!opts.installPackages, // convert to boolean
+      installNpmPackages: !opts.skipNpmInstall,
+      installPeerDependencies: !opts.skipNpmInstall,
       verbose: opts.verbose === true,
       excludeRegistryPrefix: !!opts.excludeRegistryPrefix,
       silentPackageManagerResult: false,
diff --git a/src/consumer/component-ops/build-component.ts b/src/consumer/component-ops/build-component.ts
index 697ef2be023f..59ffb0575866 100644
--- a/src/consumer/component-ops/build-component.ts
+++ b/src/consumer/component-ops/build-component.ts
@@ -299,16 +299,22 @@ async function _runBuild({
   let shouldBuildUponDependenciesChanges;
   const isolateFunc = async ({
     targetDir,
-    shouldBuildDependencies
+    shouldBuildDependencies,
+    installNpmPackages,
+    keepExistingCapsule
   }: {
     targetDir?: string;
     shouldBuildDependencies?: boolean;
+    installNpmPackages?: boolean;
+    keepExistingCapsule?: boolean;
   }): Promise<{ capsule: Capsule; componentWithDependencies: ComponentWithDependencies }> => {
     shouldBuildUponDependenciesChanges = shouldBuildDependencies;
     const isolator = await Isolator.getInstance('fs', scope, consumer, targetDir);
     const componentWithDependencies = await isolator.isolate(component.id, {
       shouldBuildDependencies,
-      writeDists: false
+      writeDists: false,
+      installNpmPackages,
+      keepExistingCapsule
     });
     return new ExtensionIsolateResult(isolator, componentWithDependencies);
   };
diff --git a/src/consumer/component/sources/data-to-persist.ts b/src/consumer/component/sources/data-to-persist.ts
index 645b8232f4f9..0ee4896cf954 100644
--- a/src/consumer/component/sources/data-to-persist.ts
+++ b/src/consumer/component/sources/data-to-persist.ts
@@ -71,14 +71,25 @@ export default class DataToPersist {
     await this._persistFilesToFS();
     await this._persistSymlinksToFS();
   }
-  async persistAllToCapsule(capsule: Capsule) {
+  async persistAllToCapsule(capsule: Capsule, opts = { keepExistingCapsule: false }) {
     this._log();
     this._validateRelative();
-    await Promise.all(this.remove.map(pathToRemove => capsule.removePath(pathToRemove.path)));
-    await Promise.all(this.files.map(file => this._writeFileToCapsule(capsule, file)));
+    if (!opts.keepExistingCapsule) {
+      await Promise.all(this.remove.map(pathToRemove => capsule.removePath(pathToRemove.path)));
+    }
+    await Promise.all(
+      this.files.map(file =>
+        this._writeFileToCapsule(capsule, file, { overwriteExistingFile: !!opts.keepExistingCapsule })
+      )
+    );
     await Promise.all(this.symlinks.map(symlink => this.atomicSymlink(capsule, symlink)));
   }
-  async _writeFileToCapsule(capsule: Capsule, file: AbstractVinyl) {
+  async _writeFileToCapsule(capsule: Capsule, file: AbstractVinyl, opts = { overwriteExistingFile: false }) {
+    // overwriteExistingFile: if a file with the same name exists in the capsule, overwrite it
+    if (opts.overwriteExistingFile) {
+      await capsule.removePath(file.path);
+      return capsule.outputFile(file.path, file.contents, {});
+    }
     if (file.override === false) {
       // @todo, capsule hack. use capsule.fs once you get it as a component.
       // @ts-ignore AUTO-ADDED-AFTER-MIGRATION-PLEASE-FIX!
diff --git a/src/environment/isolator.ts b/src/environment/isolator.ts
index 5028eeb9baa2..2bfa6a338c32 100644
--- a/src/environment/isolator.ts
+++ b/src/environment/isolator.ts
@@ -2,6 +2,7 @@ import R from 'ramda';
 import * as path from 'path';
 import semver from 'semver';
 import pMapSeries from 'p-map-series';
+import { runModule } from 'librarian';
 import Capsule from '../../components/core/capsule';
 import createCapsule from './capsule-factory';
 import Consumer from '../consumer/consumer';
@@ -22,6 +23,7 @@ import BitMap from '../consumer/bit-map';
 import { getManipulateDirForComponentWithDependencies } from '../consumer/component-ops/manipulate-dir';
 import GeneralError from '../error/general-error';
 import { PathOsBased } from '../utils/path';
+import loader from '../cli/loader';
 
 export interface IsolateOptions {
   writeToPath?: PathOsBased; // Path to write the component to
@@ -34,6 +36,7 @@ export interface IsolateOptions {
   writeDists?: boolean; // Write dist files
   shouldBuildDependencies?: boolean; // Build all depedencies before the isolation (used by tools like ts compiler)
   installNpmPackages?: boolean; // Install the package dependencies
+  keepExistingCapsule?: boolean; // Do not delete the capsule after using it (useful for incremental builds)
   installPeerDependencies?: boolean; // Install the peer package dependencies
   verbose?: boolean; // Print more logs
   excludeRegistryPrefix?: boolean; // exclude the registry prefix from the component's name in the package.json
@@ -55,19 +58,30 @@ export default class Isolator {
   _npmVersionHasValidated = false;
   // @ts-ignore AUTO-ADDED-AFTER-MIGRATION-PLEASE-FIX!
   componentRootDir: string;
-  constructor(capsule: Capsule, scope: Scope, consumer?: Consumer) {
+  dir?: string;
+  constructor(capsule: Capsule, scope: Scope, consumer?: Consumer, dir?: string) {
     this.capsule = capsule;
     this.scope = scope;
     this.consumer = consumer;
+    this.dir = dir;
   }
 
   static async getInstance(containerType = 'fs', scope: Scope, consumer?: Consumer, dir?: string): Promise<Isolator> {
     logger.debug(`Isolator.getInstance, creating a capsule with an ${containerType} container, dir ${dir || 'N/A'}`);
     const capsule = await createCapsule(containerType, dir);
-    return new Isolator(capsule, scope, consumer);
+    return new Isolator(capsule, scope, consumer, dir);
   }
 
   async isolate(componentId: BitId, opts: IsolateOptions): Promise<ComponentWithDependencies> {
+    const loaderPrefix = `isolating component - ${componentId.name}`;
+    loader.setText(loaderPrefix);
+    const log = message => loader.setText(`${loaderPrefix}: ${message}`);
+    // @ts-ignore TODO: this should be part of the capsule interface
+    this.capsule.execNode = async (executable, args) => {
+      const onScriptRun = () => loader.setText(`building component - ${componentId.name}`);
+      // TODO: do this from the compiler/tester so that the isolator doesn't need to know if it's a builder/tester/*...
+      await runModule(executable, { args, cwd: this.dir, log, onScriptRun });
+    };
     const componentWithDependencies: ComponentWithDependencies = await this._loadComponent(componentId);
     if (opts.shouldBuildDependencies) {
       topologicalSortComponentDependencies(componentWithDependencies);
@@ -83,6 +97,8 @@ export default class Isolator {
       });
     }
     const writeToPath = opts.writeToPath;
+    // default should be true
+    const installNpmPackages = typeof opts.installNpmPackages === 'undefined' ? true : opts.installNpmPackages;
     const concreteOpts: ManyComponentsWriterParams = {
       componentsWithDependencies: [componentWithDependencies],
       writeToPath,
@@ -93,7 +109,7 @@ export default class Isolator {
       createNpmLinkFiles: opts.createNpmLinkFiles,
       saveDependenciesAsComponents: opts.saveDependenciesAsComponents !== false,
       writeDists: opts.writeDists,
-      installNpmPackages: !!opts.installNpmPackages, // convert to boolean
+      installNpmPackages,
       installPeerDependencies: !!opts.installPeerDependencies, // convert to boolean
       addToRootPackageJson: false,
       verbose: opts.verbose,
@@ -103,34 +119,40 @@ export default class Isolator {
     };
     this.componentWithDependencies = componentWithDependencies;
     this.manyComponentsWriter = new ManyComponentsWriter(concreteOpts);
-    await this.writeComponentsAndDependencies();
-    await this.installComponentPackages();
-    await this.writeLinks();
+    await this.writeComponentsAndDependencies({ keepExistingCapsule: !!opts.keepExistingCapsule });
+    await this.installComponentPackages({
+      installNpmPackages,
+      keepExistingCapsule: !!opts.keepExistingCapsule
+    });
+    await this.writeLinks({ keepExistingCapsule: !!opts.keepExistingCapsule });
     this.capsuleBitMap = this.manyComponentsWriter.bitMap;
     return componentWithDependencies;
   }
 
-  async writeComponentsAndDependencies() {
+  async writeComponentsAndDependencies(opts = { keepExistingCapsule: false }) {
     logger.debug('ManyComponentsWriter, writeAllToIsolatedCapsule');
     this._manipulateDir();
     await this.manyComponentsWriter._populateComponentsFilesToWrite();
     await this.manyComponentsWriter._populateComponentsDependenciesToWrite();
-    await this._persistComponentsDataToCapsule();
+    await this._persistComponentsDataToCapsule({ keepExistingCapsule: !!opts.keepExistingCapsule });
   }
 
-  async installComponentPackages() {
+  async installComponentPackages(opts = { installNpmPackages: true, keepExistingCapsule: false }) {
     // @ts-ignore AUTO-ADDED-AFTER-MIGRATION-PLEASE-FIX!
     this.capsulePackageJson = this.componentWithDependencies.component.packageJsonFile;
     // @ts-ignore AUTO-ADDED-AFTER-MIGRATION-PLEASE-FIX!
     this.componentRootDir = this.componentWithDependencies.component.writtenPath;
-    await this._addComponentsToRoot();
+    await this._addComponentsToRoot({ keepExistingCapsule: !!opts.keepExistingCapsule });
     logger.debug('ManyComponentsWriter, install packages on capsule');
-    await this._installWithPeerOption();
+    if (opts.installNpmPackages) {
+      await this._installWithPeerOption();
+    }
   }
 
-  async writeLinks() {
+  async writeLinks(opts = { keepExistingCapsule: false }) {
     const links = await this.manyComponentsWriter._getAllLinks();
-    await links.persistAllToCapsule(this.capsule);
+    // links is a DataToPersist instance
+    await links.persistAllToCapsule(this.capsule, { keepExistingCapsule: !!opts.keepExistingCapsule });
   }
 
   /**
@@ -175,14 +197,14 @@ export default class Isolator {
     return loadFlattenedDependenciesForCapsule(consumer, component);
   }
 
-  async _persistComponentsDataToCapsule() {
+  async _persistComponentsDataToCapsule(opts = { keepExistingCapsule: false }) {
     const dataToPersist = new DataToPersist();
     const allComponents = [this.componentWithDependencies.component, ...this.componentWithDependencies.allDependencies];
     allComponents.forEach(component => dataToPersist.merge(component.dataToPersist));
-    await dataToPersist.persistAllToCapsule(this.capsule);
+    await dataToPersist.persistAllToCapsule(this.capsule, { keepExistingCapsule: !!opts.keepExistingCapsule });
   }
 
-  async _addComponentsToRoot(): Promise<void> {
+  async _addComponentsToRoot(opts = { keepExistingCapsule: false }): Promise<void> {
     // @ts-ignore AUTO-ADDED-AFTER-MIGRATION-PLEASE-FIX!
     // @ts-ignore AUTO-ADDED-AFTER-MIGRATION-PLEASE-FIX!
     const capsulePath = this.capsule.container.getPath();
@@ -203,13 +225,13 @@ export default class Isolator {
     }, {});
     if (R.isEmpty(componentsToAdd)) return;
     this.capsulePackageJson.addDependencies(componentsToAdd);
-    await this._writeCapsulePackageJson();
+    await this._writeCapsulePackageJson({ keepExistingCapsule: !!opts.keepExistingCapsule });
   }
 
-  async _writeCapsulePackageJson() {
+  async _writeCapsulePackageJson(opts = { keepExistingCapsule: false }) {
     const dataToPersist = new DataToPersist();
     dataToPersist.addFile(this.capsulePackageJson.toVinylFile());
-    dataToPersist.persistAllToCapsule(this.capsule);
+    return dataToPersist.persistAllToCapsule(this.capsule, { keepExistingCapsule: !!opts.keepExistingCapsule });
   }
 
   async _getNpmVersion() {