diff --git a/.eslintrc.js b/.eslintrc.js
index 122cfe1..5fb0683 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -1,6 +1,13 @@
 module.exports = {
+    parser: "@typescript-eslint/parser",
+    plugins: ["@typescript-eslint"],
     extends: [
         "@tophat/eslint-config/base",
         "@tophat/eslint-config/jest",
-    ]
+        "plugin:@typescript-eslint/eslint-recommended",
+        "plugin:@typescript-eslint/recommended"
+    ],
+    settings: {
+        'import/resolver': { node: { extensions: ['.ts'] }}
+    }
 }
diff --git a/.gitignore b/.gitignore
index 6704566..54bd47d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -102,3 +102,5 @@ dist
 
 # TernJS port file
 .tern-port
+
+*.sw[a-z]
diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 0000000..86c23c7
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,3 @@
+{
+    "semi": false
+}
diff --git a/babel.config.json b/babel.config.json
index 87c59e0..6d98969 100644
--- a/babel.config.json
+++ b/babel.config.json
@@ -1,5 +1,5 @@
 {
     "comments": false,
     "ignore": ["**/*.test.js"],
-    "presets": [["@babel/preset-env", { "targets": { "node": 10 } }]]
+    "presets": ["@babel/preset-typescript", ["@babel/preset-env", { "targets": { "node": 10 } }]]
 }
diff --git a/package.json b/package.json
index 7d98493..dba1beb 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "packwatch",
     "version": "0.0.0",
-    "main": "dist/index.js",
+    "main": "dist/cli.js",
     "description": "📦👀 Keep an eye on your packages' footprint",
     "keywords": [
         "npm",
@@ -19,9 +19,9 @@
     "author": "Marc Cataford <c.marcandre@gmail.com>",
     "license": "MIT",
     "files": [
-        "dist/**/*.js"
+        "dist/*.ts"
     ],
-    "bin": "./dist/index.js",
+    "bin": "./dist/cli.js",
     "repository": {
         "type": "git",
         "url": "https://github.com/mcataford/packwatch.git"
@@ -32,8 +32,8 @@
     ],
     "scripts": {
         "prebuild": "rimraf dist",
-        "build": "babel src -d dist",
-        "lint": "eslint src *.js",
+        "build": "babel src/index.ts src/cli.ts -d dist --extensions .ts",
+        "lint": "eslint src/**/*.ts",
         "lint:fix": "yarn lint --fix",
         "test": "jest src",
         "test:watch": "yarn test --watchAll",
@@ -43,7 +43,12 @@
         "@babel/cli": "^7.8.4",
         "@babel/core": "^7.8.6",
         "@babel/preset-env": "^7.8.7",
+        "@babel/preset-typescript": "^7.12.7",
         "@tophat/eslint-config": "^0.7.0",
+        "@types/jest": "^26.0.19",
+        "@types/node": "^14.14.13",
+        "@typescript-eslint/eslint-plugin": "^4.9.1",
+        "@typescript-eslint/parser": "^4.9.1",
         "eslint": "^7.0.0",
         "eslint-config-prettier": "^6.10.0",
         "eslint-plugin-import": "^2.20.1",
@@ -54,6 +59,7 @@
         "pre-commit": "^1.2.2",
         "prettier": "^2.0.5",
         "rimraf": "^3.0.2",
-        "semantic-release": "^17.0.4"
+        "semantic-release": "^17.0.4",
+        "typescript": "^4.1.3"
     }
 }
diff --git a/src/__tests__/index.test.ts b/src/__tests__/index.test.ts
new file mode 100644
index 0000000..b40c800
--- /dev/null
+++ b/src/__tests__/index.test.ts
@@ -0,0 +1,262 @@
+import * as childProcess from 'child_process'
+import { readFileSync } from 'fs'
+
+import mockFS from 'mock-fs'
+
+import runPackwatch from '..'
+
+jest.mock('child_process')
+
+function getPackOutput({ packageSize, unpackedSize }) {
+    return `
+npm notice
+npm notice 📦  footprint@0.0.0
+npm notice === Tarball Contents ===
+npm notice 732B  package.json
+npm notice 1.8kB dist/helpers.js
+npm notice 1.9kB dist/index.js
+npm notice === Tarball Details ===
+npm notice name:          footprint
+npm notice version:       0.0.0
+npm notice filename:      footprint-0.0.0.tgz
+npm notice package size:  ${packageSize}
+npm notice unpacked size: ${unpackedSize}
+npm notice shasum:        bdf33d471543cd8126338a82a27b16a9010b8dbd
+npm notice integrity:     sha512-ZZvTg9GVcJw8J[...]bkE0xlqQhlt4Q==
+npm notice total files:   3
+npm notice
+    `
+}
+
+function getManifest() {
+    try {
+        return JSON.parse(readFileSync('.packwatch.json', { encoding: 'utf8' }))
+    } catch {
+        /* No manifest */
+    }
+}
+
+function setupMockFS({
+    hasPackageJSON,
+    hasManifest,
+    manifestLimit,
+    manifestSize,
+}) {
+    const fs = {}
+
+    if (hasPackageJSON) fs['package.json'] = '{}'
+
+    if (hasManifest)
+        fs['.packwatch.json'] = JSON.stringify({
+            unpackedSize: '0.5 B',
+            limitBytes: manifestLimit,
+            limit: `${manifestLimit}  B`,
+            packageSize: `${manifestSize}  B`,
+            packageSizeBytes: manifestSize,
+        })
+    mockFS(fs)
+}
+describe('Packwatch', () => {
+    let mockLogger
+    beforeEach(() => {
+        mockFS({})
+        mockLogger = jest.spyOn(global.console, 'log').mockImplementation()
+    })
+
+    afterEach(jest.restoreAllMocks)
+
+    afterAll(mockFS.restore)
+
+    it('warns the user and errors if run away from package.json', () => {
+        mockFS({})
+        runPackwatch()
+
+        expect(mockLogger.mock.calls).toHaveLength(1)
+        expect(mockLogger.mock.calls[0][0]).toMatchInlineSnapshot(
+            '"🤔 There is no package.json file here. Are you in the root directory of your project?"',
+        )
+    })
+
+    describe('without manifest', () => {
+        beforeEach(() => {
+            setupMockFS({ hasPackageJSON: true })
+        })
+
+        it.each(['1 B', '1.1 B', '1 kB', '1.1 kB', '1 mB', '1.1 mB'])(
+            'generates the initial manifest properly (size = %s)',
+            mockSize => {
+                jest.spyOn(childProcess, 'spawnSync').mockReturnValue({
+                    stderr: getPackOutput({
+                        packageSize: mockSize,
+                        unpackedSize: mockSize,
+                    }),
+                })
+                const returnCode = runPackwatch()
+                const manifest = getManifest()
+                expect(returnCode).toEqual(1)
+                expect(manifest).toEqual({
+                    limit: mockSize,
+                    packageSize: mockSize,
+                    unpackedSize: mockSize,
+                })
+            },
+        )
+
+        it('outputs expected messaging', () => {
+            jest.spyOn(childProcess, 'spawnSync').mockReturnValue({
+                stderr: getPackOutput({
+                    packageSize: '1 B',
+                    unpackedSize: '2 B',
+                }),
+            })
+
+            runPackwatch()
+
+            expect(mockLogger.mock.calls).toHaveLength(2)
+            expect(mockLogger.mock.calls[0][0]).toMatchInlineSnapshot(`
+        "📝 No Manifest to compare against! Current package stats written to .packwatch.json!
+        Package size (1 B) adopted as new limit."
+      `)
+            expect(mockLogger.mock.calls[1][0]).toMatchInlineSnapshot(
+                '"❗ It looks like you ran PackWatch without a manifest. To prevent accidental passes in CI or hooks, packwatch will terminate with an error. If you are running packwatch for the first time in your project, this is expected!"',
+            )
+        })
+
+        it('outputs expected messaging when not updating the manifest', () => {
+            jest.spyOn(childProcess, 'spawnSync').mockReturnValue({
+                stderr: getPackOutput({
+                    packageSize: '1 B',
+                    unpackedSize: '2 B',
+                }),
+            })
+
+            runPackwatch({ isUpdatingManifest: true })
+
+            expect(mockLogger.mock.calls).toHaveLength(1)
+            expect(mockLogger.mock.calls[0][0]).toMatchInlineSnapshot(`
+        "📝 No Manifest to compare against! Current package stats written to .packwatch.json!
+        Package size (1 B) adopted as new limit."
+      `)
+        })
+    })
+
+    describe('with manifest', () => {
+        it('messages when the size is equal to the limit', () => {
+            setupMockFS({
+                hasPackageJSON: true,
+                hasManifest: true,
+                manifestLimit: 1,
+                manifestSize: 1,
+            })
+            jest.spyOn(childProcess, 'spawnSync').mockReturnValue({
+                stderr: getPackOutput({
+                    packageSize: '1 B',
+                    unpackedSize: '2 B',
+                }),
+            })
+            runPackwatch()
+            expect(mockLogger.mock.calls).toHaveLength(1)
+            expect(mockLogger.mock.calls[0][0]).toMatchInlineSnapshot(
+                '"📦 Nothing to report! Your package is the same size as the latest manifest reports! (Limit: 1  B)"',
+            )
+        })
+
+        it('messages when the size is lower than the limit (no growth)', () => {
+            setupMockFS({
+                hasPackageJSON: true,
+                hasManifest: true,
+                manifestLimit: 5,
+                manifestSize: 1,
+            })
+            jest.spyOn(childProcess, 'spawnSync').mockReturnValue({
+                stderr: getPackOutput({
+                    packageSize: '1 B',
+                    unpackedSize: '2 B',
+                }),
+            })
+            runPackwatch()
+            expect(mockLogger.mock.calls).toHaveLength(1)
+            expect(mockLogger.mock.calls[0][0]).toMatchInlineSnapshot(
+                '"📦 Nothing to report! Your package is the same size as the latest manifest reports! (Limit: 5  B)"',
+            )
+        })
+        it('messages when the size is lower than the limit (growth)', () => {
+            setupMockFS({
+                hasPackageJSON: true,
+                hasManifest: true,
+                manifestLimit: 5,
+                manifestSize: 2,
+            })
+            jest.spyOn(childProcess, 'spawnSync').mockReturnValue({
+                stderr: getPackOutput({
+                    packageSize: '3 B',
+                    unpackedSize: '2 B',
+                }),
+            })
+            runPackwatch()
+            expect(mockLogger.mock.calls).toHaveLength(1)
+            expect(mockLogger.mock.calls[0][0]).toMatchInlineSnapshot(
+                '"📦 👀 Your package grew! 3 B > 2  B (Limit: 5  B)"',
+            )
+        })
+        it('messages when the size is lower than the limit (shrinkage)', () => {
+            setupMockFS({
+                hasPackageJSON: true,
+                hasManifest: true,
+                manifestLimit: 5,
+                manifestSize: 2,
+            })
+            jest.spyOn(childProcess, 'spawnSync').mockReturnValue({
+                stderr: getPackOutput({
+                    packageSize: '1 B',
+                    unpackedSize: '2 B',
+                }),
+            })
+            runPackwatch()
+            expect(mockLogger.mock.calls).toHaveLength(1)
+            expect(mockLogger.mock.calls[0][0]).toMatchInlineSnapshot(
+                '"📦 💯 Your package shrank! 1 B < 2  B (Limit: 5  B)"',
+            )
+        })
+        it('messages when the size exceeds the limit', () => {
+            setupMockFS({
+                hasPackageJSON: true,
+                hasManifest: true,
+                manifestLimit: 0.5,
+                manifestSize: 0.5,
+            })
+            jest.spyOn(childProcess, 'spawnSync').mockReturnValue({
+                stderr: getPackOutput({
+                    packageSize: '1 B',
+                    unpackedSize: '2 B',
+                }),
+            })
+            runPackwatch()
+            expect(mockLogger.mock.calls).toHaveLength(1)
+            expect(mockLogger.mock.calls[0][0]).toMatchInlineSnapshot(`
+        "🔥🔥📦🔥🔥 Your package exceeds the limit set in .packwatch.json! 1 B > 0.5  B
+        Either update the limit by using the --update-manifest flag or trim down your packed files!"
+      `)
+        })
+
+        it('messages when updating the manifest', () => {
+            setupMockFS({
+                hasPackageJSON: true,
+                hasManifest: true,
+                manifestLimit: 0.5,
+                manifestSize: 0.5,
+            })
+            jest.spyOn(childProcess, 'spawnSync').mockReturnValue({
+                stderr: getPackOutput({
+                    packageSize: '1 B',
+                    unpackedSize: '2 B',
+                }),
+            })
+            runPackwatch({ isUpdatingManifest: true })
+            expect(mockLogger.mock.calls).toHaveLength(1)
+            expect(mockLogger.mock.calls[0][0]).toMatchInlineSnapshot(
+                '"📝 Updated the manifest! Package size: 1 B, Limit: 1 B"',
+            )
+        })
+    })
+})
diff --git a/src/cli.ts b/src/cli.ts
new file mode 100644
index 0000000..6742f26
--- /dev/null
+++ b/src/cli.ts
@@ -0,0 +1,7 @@
+#!/usr/bin/env node
+
+import runPackwatch from '.'
+
+const isUpdatingManifest = process.argv.includes('--update-manifest')
+const processExit = runPackwatch({ isUpdatingManifest })
+process.exit(processExit)
diff --git a/src/helpers.js b/src/helpers.js
deleted file mode 100644
index 03f1399..0000000
--- a/src/helpers.js
+++ /dev/null
@@ -1,73 +0,0 @@
-const { spawnSync } = require('child_process')
-const { readFileSync, writeFileSync } = require('fs')
-
-const PACKAGE_SIZE_PATT = /package size:\s+([0-9]+\.?[0-9]*\s+[A-Za-z]+)/g
-const UNPACKED_SIZE_PATT = /unpacked size:\s+([0-9]+\.?[0-9]*\s+[A-Za-z]+)/g
-const SIZE_SUFFIX_PATT = /([A-Za-z]+)/
-const SIZE_MAGNITUDE_PATT = /([0-9]+\.?[0-9]*)/
-const MANIFEST_FILENAME = '.packwatch.json'
-
-const FS_OPTIONS = { encoding: 'utf-8' }
-
-function convertSizeToBytes(sizeString) {
-    const sizeSuffix = SIZE_SUFFIX_PATT.exec(sizeString)[1]
-    const sizeMagnitude = SIZE_MAGNITUDE_PATT.exec(sizeString)[1]
-
-    let multiplier = 1
-
-    if (sizeSuffix === 'kB') multiplier = 1000
-    else if (sizeSuffix === 'mB') {
-        multiplier = 1000000
-    }
-
-    return multiplier * parseFloat(sizeMagnitude)
-}
-
-function getCurrentPackageStats() {
-    const { stderr } = spawnSync('npm', ['pack', '--dry-run'], FS_OPTIONS)
-    const packageSize = PACKAGE_SIZE_PATT.exec(stderr)[1]
-    const unpackedSize = UNPACKED_SIZE_PATT.exec(stderr)[1]
-
-    return {
-        packageSize,
-        unpackedSize,
-        packageSizeBytes: convertSizeToBytes(packageSize),
-        unpackedSizeBytes: convertSizeToBytes(unpackedSize),
-    }
-}
-
-function getPreviousPackageStats() {
-    try {
-        const currentManifest = readFileSync(MANIFEST_FILENAME, FS_OPTIONS)
-        const parsedManifest = JSON.parse(currentManifest)
-        return {
-            ...parsedManifest,
-            packageSizeBytes: convertSizeToBytes(parsedManifest.packageSize),
-            unpackedSizeBytes: convertSizeToBytes(parsedManifest.unpackedSize),
-            limitBytes: convertSizeToBytes(parsedManifest.limit),
-        }
-    } catch (e) {
-        return {}
-    }
-}
-
-function createOrUpdateManifest({ previous, current, updateLimit = false }) {
-    const { limit } = previous || {}
-    const { packageSize, unpackedSize } = current
-
-    const newManifest = {
-        limit: updateLimit ? packageSize : limit || packageSize,
-        packageSize: packageSize,
-        unpackedSize: unpackedSize,
-    }
-
-    writeFileSync(MANIFEST_FILENAME, JSON.stringify(newManifest))
-}
-
-module.exports = {
-    createOrUpdateManifest,
-    getPreviousPackageStats,
-    getCurrentPackageStats,
-    convertSizeToBytes,
-    MANIFEST_FILENAME,
-}
diff --git a/src/index.d.ts b/src/index.d.ts
new file mode 100644
index 0000000..c0a52f0
--- /dev/null
+++ b/src/index.d.ts
@@ -0,0 +1,8 @@
+export type Report = {
+    packageSize: string
+    unpackedSize?: string
+    packageSizeBytes?: number
+    unpackedSizeBytes?: number
+    limit?: string
+    limitBytes?: number
+}
diff --git a/src/index.js b/src/index.js
deleted file mode 100644
index 4d05c07..0000000
--- a/src/index.js
+++ /dev/null
@@ -1,106 +0,0 @@
-#!/usr/bin/env node
-
-const { existsSync } = require('fs')
-
-const {
-    MANIFEST_FILENAME,
-    getCurrentPackageStats,
-    getPreviousPackageStats,
-    createOrUpdateManifest,
-} = require('./helpers')
-
-if (!existsSync('package.json')) {
-    console.log(
-        '🤔 There is no package.json file here. Are you in the root directory of your project?',
-    )
-    process.exit(1)
-}
-
-const isUpdatingManifest = process.argv.includes('--update-manifest')
-
-const currentStats = getCurrentPackageStats()
-
-/*
- * If there is no manifest file yet, we can use the current package stats as
- * a base to build one. The current package size becomes the limit.
- */
-
-if (!existsSync(MANIFEST_FILENAME)) {
-    createOrUpdateManifest({ current: currentStats })
-    console.log(
-        `📝 No Manifest to compare against! Current package stats written to ${MANIFEST_FILENAME}!`,
-    )
-    console.log(
-        `Package size (${currentStats.packageSize}) adopted as new limit.`,
-    )
-
-    if (!isUpdatingManifest) {
-        console.log(
-            '❗ It looks like you ran PackWatch without a manifest. To prevent accidental passes in CI or hooks, packwatch will terminate with an error. If you are running packwatch for the first time in your project, this is expected!',
-        )
-    }
-    // If the update flag wasn't specified, exit with a non-zero code so we
-    // don't "accidentally" pass CI builds if the manifest didn't exist
-    process.exit(isUpdatingManifest ? 0 : 1)
-}
-
-const previousStats = getPreviousPackageStats()
-const { packageSizeBytes, packageSize } = currentStats
-const {
-    packageSize: previousSize,
-    packageSizeBytes: previousSizeBytes,
-    limit,
-    limitBytes,
-} = previousStats
-const hasExceededLimit = packageSizeBytes > limitBytes
-
-/*
- * If we are updating the manifest, we can write right away and terminate.
- */
-
-if (isUpdatingManifest) {
-    createOrUpdateManifest({
-        previous: previousStats,
-        current: currentStats,
-        updateLimit: true,
-    })
-    console.log(
-        `📝 Updated the manifest! Package size: ${packageSize}, Limit: ${packageSize}`,
-    )
-    process.exit(0)
-}
-
-/*
- * If there is a manifest file and the current package busts its limit
- * we signal it and terminate with an error.
- */
-
-if (hasExceededLimit) {
-    console.log(
-        `🔥🔥📦🔥🔥 Your package exceeds the limit set in ${MANIFEST_FILENAME}! ${packageSize} > ${limit}`,
-    )
-    console.log(
-        'Either update the limit by using the --update-manifest flag or trim down your packed files!',
-    )
-    process.exit(1)
-}
-
-/*
- * If there is a manifest file and the limit is not busted, we give
- * the user some feedback on how the current package compares with
- * the previous one.
- */
-
-if (packageSizeBytes > previousSizeBytes) {
-    console.log(
-        `📦 👀 Your package grew! ${packageSize} > ${previousSize} (Limit: ${limit})`,
-    )
-} else if (packageSizeBytes < previousSizeBytes) {
-    console.log(
-        `📦 💯 Your package shrank! ${packageSize} < ${previousSize} (Limit: ${limit})`,
-    )
-} else {
-    console.log(
-        `📦 Nothing to report! Your package is the same size as the latest manifest reports! (Limit: ${limit})`,
-    )
-}
diff --git a/src/index.test.js b/src/index.test.js
deleted file mode 100644
index ae0a9aa..0000000
--- a/src/index.test.js
+++ /dev/null
@@ -1,177 +0,0 @@
-const childProcess = require('child_process')
-const { readFileSync } = require('fs')
-
-const mockFS = require('mock-fs')
-
-jest.mock('child_process')
-childProcess.spawnSync = jest.fn(() => ({ stderr: mockPackOutput }))
-
-const {
-    MANIFEST_FILENAME,
-    convertSizeToBytes,
-    getCurrentPackageStats,
-    getPreviousPackageStats,
-    createOrUpdateManifest,
-} = require('./helpers')
-
-const mockPackageSize = '1.1 kB'
-const mockUnpackedSize = '9000 kB'
-
-const mockPackOutput = `
-npm notice
-npm notice 📦  footprint@0.0.0
-npm notice === Tarball Contents ===
-npm notice 732B  package.json
-npm notice 1.8kB dist/helpers.js
-npm notice 1.9kB dist/index.js
-npm notice === Tarball Details ===
-npm notice name:          footprint
-npm notice version:       0.0.0
-npm notice filename:      footprint-0.0.0.tgz
-npm notice package size:  ${mockPackageSize}
-npm notice unpacked size: ${mockUnpackedSize}
-npm notice shasum:        bdf33d471543cd8126338a82a27b16a9010b8dbd
-npm notice integrity:     sha512-ZZvTg9GVcJw8J[...]bkE0xlqQhlt4Q==
-npm notice total files:   3
-npm notice
-    `
-describe('Helpers', () => {
-    beforeEach(() => {
-        mockFS.restore()
-        jest.restoreAllMocks()
-    })
-
-    afterAll(mockFS.restore)
-
-    describe('Size string conversion', () => {
-        it.each`
-            sizeString  | expectedValue
-            ${'1 B'}    | ${1}
-            ${'1.1 B'}  | ${1.1}
-            ${'1 kB'}   | ${1000}
-            ${'1.1kB'}  | ${1100}
-            ${'1 mB'}   | ${1000000}
-            ${'1.1 mB'} | ${1100000}
-        `(
-            'converts $sizeString properly to $expectedValue bytes',
-            ({ sizeString, expectedValue }) => {
-                expect(convertSizeToBytes(sizeString)).toEqual(expectedValue)
-            },
-        )
-    })
-
-    describe('Current package statistics', () => {
-        it('constructs the current package report properly', () => {
-            const packageSizeBytes = 1100
-            const unpackedSizeBytes = 9000000
-
-            expect(getCurrentPackageStats()).toEqual({
-                packageSize: mockPackageSize,
-                packageSizeBytes,
-                unpackedSize: mockUnpackedSize,
-                unpackedSizeBytes,
-            })
-        })
-    })
-
-    describe('Previous package statistics', () => {
-        it('constructs the previous package report properly', () => {
-            const packageSize = '0.9 kB'
-            const packageSizeBytes = 900
-            const unpackedSize = '90 kB'
-            const unpackedSizeBytes = 90000
-            const limit = '1 kB'
-            const limitBytes = 1000
-            const mockReport = { packageSize, unpackedSize, limit }
-            mockFS({ [MANIFEST_FILENAME]: JSON.stringify(mockReport) })
-
-            expect(getPreviousPackageStats()).toEqual({
-                packageSize,
-                packageSizeBytes,
-                unpackedSize,
-                unpackedSizeBytes,
-                limit,
-                limitBytes,
-            })
-        })
-
-        it('returns an empty manifest if it fails to reads the manifest file', () => {
-            mockFS({
-                [MANIFEST_FILENAME]: 'not valid JSON',
-            })
-
-            expect(getPreviousPackageStats()).toEqual({})
-        })
-    })
-
-    describe('Creating or updating the manifest', () => {
-        const currentStats = {
-            packageSize: '1 kB',
-            unpackedSize: '10 kB',
-        }
-
-        const previousManifest = {
-            limit: '2 kB',
-            packageSize: '1.5 kB',
-        }
-        it('creates a anifest from the current data if no previous data is provided', () => {
-            mockFS({})
-
-            createOrUpdateManifest({ current: currentStats })
-
-            const writtenManifest = readFileSync(MANIFEST_FILENAME, {
-                encoding: 'utf-8',
-            })
-
-            expect(JSON.parse(writtenManifest)).toEqual({
-                packageSize: currentStats.packageSize,
-                unpackedSize: currentStats.unpackedSize,
-                limit: currentStats.packageSize,
-            })
-        })
-
-        it('updates the previous manifest sizes if previous data exists', () => {
-            mockFS({
-                [MANIFEST_FILENAME]: JSON.stringify(previousManifest),
-            })
-
-            createOrUpdateManifest({
-                current: currentStats,
-                previous: previousManifest,
-                updateLimit: false,
-            })
-
-            const writtenManifest = readFileSync(MANIFEST_FILENAME, {
-                encoding: 'utf-8',
-            })
-
-            expect(JSON.parse(writtenManifest)).toEqual({
-                packageSize: currentStats.packageSize,
-                unpackedSize: currentStats.unpackedSize,
-                limit: previousManifest.limit,
-            })
-        })
-
-        it('updates the previous manifest sizes and limit if previous data exists and updateLimit is set', () => {
-            mockFS({
-                [MANIFEST_FILENAME]: JSON.stringify(previousManifest),
-            })
-
-            createOrUpdateManifest({
-                current: currentStats,
-                previous: previousManifest,
-                updateLimit: true,
-            })
-
-            const writtenManifest = readFileSync(MANIFEST_FILENAME, {
-                encoding: 'utf-8',
-            })
-
-            expect(JSON.parse(writtenManifest)).toEqual({
-                packageSize: currentStats.packageSize,
-                unpackedSize: currentStats.unpackedSize,
-                limit: currentStats.packageSize,
-            })
-        })
-    })
-})
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..fb7d0ed
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,177 @@
+import { spawnSync } from 'child_process'
+import { existsSync, readFileSync, writeFileSync } from 'fs'
+
+import { Report } from './index.d'
+
+const PACKAGE_SIZE_PATT = /package size:\s*([0-9]+\.?[0-9]*\s+[A-Za-z]{1,2})/
+const UNPACKED_SIZE_PATT = /unpacked size:\s*([0-9]+\.?[0-9]*\s+[A-Za-z]{1,2})/
+const SIZE_SUFFIX_PATT = /([A-Za-z]+)/
+const SIZE_MAGNITUDE_PATT = /([0-9]+\.?[0-9]*)/
+
+const MANIFEST_FILENAME = '.packwatch.json'
+
+function convertSizeToBytes(sizeString: string): number {
+    const sizeSuffix = SIZE_SUFFIX_PATT.exec(sizeString)[1]
+    const sizeMagnitude = SIZE_MAGNITUDE_PATT.exec(sizeString)[1]
+
+    let multiplier = 1
+
+    if (sizeSuffix === 'kB') multiplier = 1000
+    else if (sizeSuffix === 'mB') {
+        multiplier = 1000000
+    }
+
+    return multiplier * parseFloat(sizeMagnitude)
+}
+
+function getCurrentPackageStats(): Report {
+    const { stderr } = spawnSync('npm', ['pack', '--dry-run'], {
+        encoding: 'utf-8',
+    })
+    const stderrString = String(stderr)
+    const packageSize = PACKAGE_SIZE_PATT.exec(stderrString)[1]
+    const unpackedSize = UNPACKED_SIZE_PATT.exec(stderrString)[1]
+
+    return {
+        packageSize,
+        unpackedSize,
+        packageSizeBytes: convertSizeToBytes(packageSize),
+        unpackedSizeBytes: convertSizeToBytes(unpackedSize),
+    }
+}
+
+function getPreviousPackageStats(): Report | null {
+    try {
+        const currentManifest = readFileSync(MANIFEST_FILENAME, {
+            encoding: 'utf-8',
+        })
+        const parsedManifest = JSON.parse(currentManifest)
+        return {
+            ...parsedManifest,
+            packageSizeBytes: convertSizeToBytes(parsedManifest.packageSize),
+            unpackedSizeBytes: convertSizeToBytes(parsedManifest.unpackedSize),
+            limitBytes: convertSizeToBytes(parsedManifest.limit),
+        }
+    } catch {
+        /* No manifest */
+    }
+}
+
+function createOrUpdateManifest({
+    previous,
+    current,
+    updateLimit = false,
+}: {
+    previous?: Report
+    current: Report
+    updateLimit?: boolean
+}): void {
+    const { limit } = previous || {}
+    const { packageSize, unpackedSize } = current
+
+    const newManifest = {
+        limit: updateLimit ? packageSize : limit || packageSize,
+        packageSize: packageSize,
+        unpackedSize: unpackedSize,
+    }
+
+    writeFileSync(MANIFEST_FILENAME, JSON.stringify(newManifest))
+}
+export default function run(
+    {
+        manifestFn = MANIFEST_FILENAME,
+        isUpdatingManifest,
+    }: { manifestFn?: string; isUpdatingManifest?: boolean } = {
+        manifestFn: MANIFEST_FILENAME,
+        isUpdatingManifest: false,
+    },
+): number {
+    if (!existsSync('package.json')) {
+        console.log(
+            '🤔 There is no package.json file here. Are you in the root directory of your project?',
+        )
+        return 1
+    }
+
+    const currentStats = getCurrentPackageStats()
+
+    /*
+     * If there is no manifest file yet, we can use the current package stats as
+     * a base to build one. The current package size becomes the limit.
+     */
+
+    if (!existsSync(manifestFn)) {
+        createOrUpdateManifest({ current: currentStats })
+        console.log(
+            `📝 No Manifest to compare against! Current package stats written to ${MANIFEST_FILENAME}!\nPackage size (${currentStats.packageSize}) adopted as new limit.`,
+        )
+
+        if (!isUpdatingManifest) {
+            console.log(
+                '❗ It looks like you ran PackWatch without a manifest. To prevent accidental passes in CI or hooks, packwatch will terminate with an error. If you are running packwatch for the first time in your project, this is expected!',
+            )
+        }
+        // If the update flag wasn't specified, exit with a non-zero code so we
+        // don't "accidentally" pass CI builds if the manifest didn't exist
+        return isUpdatingManifest ? 0 : 1
+    }
+
+    const previousStats = getPreviousPackageStats()
+    const { packageSizeBytes, packageSize } = currentStats
+    const {
+        packageSize: previousSize,
+        packageSizeBytes: previousSizeBytes,
+        limit,
+        limitBytes,
+    } = previousStats
+    const hasExceededLimit = packageSizeBytes > limitBytes
+
+    /*
+     * If we are updating the manifest, we can write right away and terminate.
+     */
+
+    if (isUpdatingManifest) {
+        createOrUpdateManifest({
+            previous: previousStats,
+            current: currentStats,
+            updateLimit: true,
+        })
+        console.log(
+            `📝 Updated the manifest! Package size: ${packageSize}, Limit: ${packageSize}`,
+        )
+        return 0
+    }
+
+    /*
+     * If there is a manifest file and the current package busts its limit
+     * we signal it and terminate with an error.
+     */
+
+    if (hasExceededLimit) {
+        console.log(
+            `🔥🔥📦🔥🔥 Your package exceeds the limit set in ${MANIFEST_FILENAME}! ${packageSize} > ${limit}\nEither update the limit by using the --update-manifest flag or trim down your packed files!`,
+        )
+        return 1
+    }
+
+    /*
+     * If there is a manifest file and the limit is not busted, we give
+     * the user some feedback on how the current package compares with
+     * the previous one.
+     */
+
+    if (packageSizeBytes > previousSizeBytes) {
+        console.log(
+            `📦 👀 Your package grew! ${packageSize} > ${previousSize} (Limit: ${limit})`,
+        )
+    } else if (packageSizeBytes < previousSizeBytes) {
+        console.log(
+            `📦 💯 Your package shrank! ${packageSize} < ${previousSize} (Limit: ${limit})`,
+        )
+    } else {
+        console.log(
+            `📦 Nothing to report! Your package is the same size as the latest manifest reports! (Limit: ${limit})`,
+        )
+    }
+    return 0
+}
diff --git a/yarn.lock b/yarn.lock
index b3ea588..4c97e75 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -103,6 +103,17 @@
     "@babel/helper-replace-supers" "^7.10.4"
     "@babel/helper-split-export-declaration" "^7.10.4"
 
+"@babel/helper-create-class-features-plugin@^7.12.1":
+  version "7.12.1"
+  resolved "https://registry.yarnpkg.com/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.12.1.tgz#3c45998f431edd4a9214c5f1d3ad1448a6137f6e"
+  integrity sha512-hkL++rWeta/OVOBTRJc9a5Azh5mt5WgZUGAKMD8JM141YsE08K//bp1unBBieO6rUKkIPyUE0USQ30jAy3Sk1w==
+  dependencies:
+    "@babel/helper-function-name" "^7.10.4"
+    "@babel/helper-member-expression-to-functions" "^7.12.1"
+    "@babel/helper-optimise-call-expression" "^7.10.4"
+    "@babel/helper-replace-supers" "^7.12.1"
+    "@babel/helper-split-export-declaration" "^7.10.4"
+
 "@babel/helper-create-regexp-features-plugin@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-create-regexp-features-plugin/-/helper-create-regexp-features-plugin-7.10.4.tgz#fdd60d88524659a0b6959c0579925e425714f3b8"
@@ -286,6 +297,11 @@
   resolved "https://registry.yarnpkg.com/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz#a78c7a7251e01f616512d31b10adcf52ada5e0d2"
   integrity sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==
 
+"@babel/helper-validator-option@^7.12.1":
+  version "7.12.1"
+  resolved "https://registry.yarnpkg.com/@babel/helper-validator-option/-/helper-validator-option-7.12.1.tgz#175567380c3e77d60ff98a54bb015fe78f2178d9"
+  integrity sha512-YpJabsXlJVWP0USHjnC/AQDTLlZERbON577YUVO/wLpqyj6HAtVYnWaQaN0iUN+1/tWn3c+uKKXjRut5115Y2A==
+
 "@babel/helper-wrap-function@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-wrap-function/-/helper-wrap-function-7.10.4.tgz#8a6f701eab0ff39f765b5a1cfef409990e624b87"
@@ -517,6 +533,13 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.10.4"
 
+"@babel/plugin-syntax-typescript@^7.12.1":
+  version "7.12.1"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-typescript/-/plugin-syntax-typescript-7.12.1.tgz#460ba9d77077653803c3dd2e673f76d66b4029e5"
+  integrity sha512-UZNEcCY+4Dp9yYRCAHrHDU+9ZXLYaY9MgBXSRLkB9WjYFRR6quJBumfVrEkUxrePPBwFcpWfNKXqVRQQtm7mMA==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.10.4"
+
 "@babel/plugin-transform-arrow-functions@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-arrow-functions/-/plugin-transform-arrow-functions-7.10.4.tgz#e22960d77e697c74f41c501d44d73dbf8a6a64cd"
@@ -754,6 +777,15 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.10.4"
 
+"@babel/plugin-transform-typescript@^7.12.1":
+  version "7.12.1"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-transform-typescript/-/plugin-transform-typescript-7.12.1.tgz#d92cc0af504d510e26a754a7dbc2e5c8cd9c7ab4"
+  integrity sha512-VrsBByqAIntM+EYMqSm59SiMEf7qkmI9dqMt6RbD/wlwueWmYcI0FFK5Fj47pP6DRZm+3teXjosKlwcZJ5lIMw==
+  dependencies:
+    "@babel/helper-create-class-features-plugin" "^7.12.1"
+    "@babel/helper-plugin-utils" "^7.10.4"
+    "@babel/plugin-syntax-typescript" "^7.12.1"
+
 "@babel/plugin-transform-unicode-escapes@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-unicode-escapes/-/plugin-transform-unicode-escapes-7.10.4.tgz#feae523391c7651ddac115dae0a9d06857892007"
@@ -854,6 +886,15 @@
     "@babel/types" "^7.4.4"
     esutils "^2.0.2"
 
+"@babel/preset-typescript@^7.12.7":
+  version "7.12.7"
+  resolved "https://registry.yarnpkg.com/@babel/preset-typescript/-/preset-typescript-7.12.7.tgz#fc7df8199d6aae747896f1e6c61fc872056632a3"
+  integrity sha512-nOoIqIqBmHBSEgBXWR4Dv/XBehtIFcw9PqZw6rFYuKrzsZmOQm3PR5siLBnKZFEsDb03IegG8nSjU/iXXXYRmw==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.10.4"
+    "@babel/helper-validator-option" "^7.12.1"
+    "@babel/plugin-transform-typescript" "^7.12.1"
+
 "@babel/runtime@^7.6.3":
   version "7.8.4"
   resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.8.4.tgz#d79f5a2040f7caa24d53e563aad49cbc05581308"
@@ -1109,6 +1150,17 @@
     "@types/yargs" "^15.0.0"
     chalk "^4.0.0"
 
+"@jest/types@^26.6.2":
+  version "26.6.2"
+  resolved "https://registry.yarnpkg.com/@jest/types/-/types-26.6.2.tgz#bef5a532030e1d88a2f5a6d933f84e97226ed48e"
+  integrity sha512-fC6QCp7Sc5sX6g8Tvbmj4XUTbyrik0akgRy03yjXbQaBWWNWGE7SGtJk98m0N8nzegD/7SggrUlivxo5ax4KWQ==
+  dependencies:
+    "@types/istanbul-lib-coverage" "^2.0.0"
+    "@types/istanbul-reports" "^3.0.0"
+    "@types/node" "*"
+    "@types/yargs" "^15.0.0"
+    chalk "^4.0.0"
+
 "@nicolo-ribaudo/chokidar-2@2.1.8-no-fsevents":
   version "2.1.8-no-fsevents"
   resolved "https://registry.yarnpkg.com/@nicolo-ribaudo/chokidar-2/-/chokidar-2-2.1.8-no-fsevents.tgz#da7c3996b8e6e19ebd14d82eaced2313e7769f9b"
@@ -1419,6 +1471,21 @@
     "@types/istanbul-lib-coverage" "*"
     "@types/istanbul-lib-report" "*"
 
+"@types/istanbul-reports@^3.0.0":
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/@types/istanbul-reports/-/istanbul-reports-3.0.0.tgz#508b13aa344fa4976234e75dddcc34925737d821"
+  integrity sha512-nwKNbvnwJ2/mndE9ItP/zc2TCzw6uuodnF4EHYWD+gCQDVBuRQL5UzbZD0/ezy1iKsFU2ZQiDqg4M9dN4+wZgA==
+  dependencies:
+    "@types/istanbul-lib-report" "*"
+
+"@types/jest@^26.0.19":
+  version "26.0.19"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.19.tgz#e6fa1e3def5842ec85045bd5210e9bb8289de790"
+  integrity sha512-jqHoirTG61fee6v6rwbnEuKhpSKih0tuhqeFbCmMmErhtu3BYlOZaXWjffgOstMM4S/3iQD31lI5bGLTrs97yQ==
+  dependencies:
+    jest-diff "^26.0.0"
+    pretty-format "^26.0.0"
+
 "@types/json-schema@^7.0.3":
   version "7.0.4"
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.4.tgz#38fd73ddfd9b55abb1e1b2ed578cb55bd7b7d339"
@@ -1439,6 +1506,11 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-13.7.7.tgz#1628e6461ba8cc9b53196dfeaeec7b07fa6eea99"
   integrity sha512-Uo4chgKbnPNlxQwoFmYIwctkQVkMMmsAoGGU4JKwLuvBefF0pCq4FybNSnfkfRCpC7ZW7kttcC/TrRtAJsvGtg==
 
+"@types/node@^14.14.13":
+  version "14.14.13"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-14.14.13.tgz#9e425079799322113ae8477297ae6ef51b8e0cdf"
+  integrity sha512-vbxr0VZ8exFMMAjCW8rJwaya0dMCDyYW2ZRdTyjtrCvJoENMpdUHOT/eTzvgyA5ZnqRZ/sI0NwqAxNHKYokLJQ==
+
 "@types/normalize-package-data@^2.4.0":
   version "2.4.0"
   resolved "https://registry.yarnpkg.com/@types/normalize-package-data/-/normalize-package-data-2.4.0.tgz#e486d0d97396d79beedd0a6e33f4534ff6b4973e"
@@ -1476,6 +1548,31 @@
   dependencies:
     "@types/yargs-parser" "*"
 
+"@typescript-eslint/eslint-plugin@^4.9.1":
+  version "4.9.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.9.1.tgz#66758cbe129b965fe9c63b04b405d0cf5280868b"
+  integrity sha512-QRLDSvIPeI1pz5tVuurD+cStNR4sle4avtHhxA+2uyixWGFjKzJ+EaFVRW6dA/jOgjV5DTAjOxboQkRDE8cRlQ==
+  dependencies:
+    "@typescript-eslint/experimental-utils" "4.9.1"
+    "@typescript-eslint/scope-manager" "4.9.1"
+    debug "^4.1.1"
+    functional-red-black-tree "^1.0.1"
+    regexpp "^3.0.0"
+    semver "^7.3.2"
+    tsutils "^3.17.1"
+
+"@typescript-eslint/experimental-utils@4.9.1":
+  version "4.9.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-4.9.1.tgz#86633e8395191d65786a808dc3df030a55267ae2"
+  integrity sha512-c3k/xJqk0exLFs+cWSJxIjqLYwdHCuLWhnpnikmPQD2+NGAx9KjLYlBDcSI81EArh9FDYSL6dslAUSwILeWOxg==
+  dependencies:
+    "@types/json-schema" "^7.0.3"
+    "@typescript-eslint/scope-manager" "4.9.1"
+    "@typescript-eslint/types" "4.9.1"
+    "@typescript-eslint/typescript-estree" "4.9.1"
+    eslint-scope "^5.0.0"
+    eslint-utils "^2.0.0"
+
 "@typescript-eslint/experimental-utils@^2.5.0":
   version "2.21.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-2.21.0.tgz#71de390a3ec00b280b69138d80733406e6e86bfa"
@@ -1485,6 +1582,29 @@
     "@typescript-eslint/typescript-estree" "2.21.0"
     eslint-scope "^5.0.0"
 
+"@typescript-eslint/parser@^4.9.1":
+  version "4.9.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-4.9.1.tgz#2d74c4db5dd5117379a9659081a4d1ec02629055"
+  integrity sha512-Gv2VpqiomvQ2v4UL+dXlQcZ8zCX4eTkoIW+1aGVWT6yTO+6jbxsw7yQl2z2pPl/4B9qa5JXeIbhJpONKjXIy3g==
+  dependencies:
+    "@typescript-eslint/scope-manager" "4.9.1"
+    "@typescript-eslint/types" "4.9.1"
+    "@typescript-eslint/typescript-estree" "4.9.1"
+    debug "^4.1.1"
+
+"@typescript-eslint/scope-manager@4.9.1":
+  version "4.9.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-4.9.1.tgz#cc2fde310b3f3deafe8436a924e784eaab265103"
+  integrity sha512-sa4L9yUfD/1sg9Kl8OxPxvpUcqxKXRjBeZxBuZSSV1v13hjfEJkn84n0An2hN8oLQ1PmEl2uA6FkI07idXeFgQ==
+  dependencies:
+    "@typescript-eslint/types" "4.9.1"
+    "@typescript-eslint/visitor-keys" "4.9.1"
+
+"@typescript-eslint/types@4.9.1":
+  version "4.9.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-4.9.1.tgz#a1a7dd80e4e5ac2c593bc458d75dd1edaf77faa2"
+  integrity sha512-fjkT+tXR13ks6Le7JiEdagnwEFc49IkOyys7ueWQ4O8k4quKPwPJudrwlVOJCUQhXo45PrfIvIarcrEjFTNwUA==
+
 "@typescript-eslint/typescript-estree@2.21.0":
   version "2.21.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-2.21.0.tgz#7e4be29f2e338195a2e8c818949ed0ff727cc943"
@@ -1498,6 +1618,28 @@
     semver "^6.3.0"
     tsutils "^3.17.1"
 
+"@typescript-eslint/typescript-estree@4.9.1":
+  version "4.9.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-4.9.1.tgz#6e5b86ff5a5f66809e1f347469fadeec69ac50bf"
+  integrity sha512-bzP8vqwX6Vgmvs81bPtCkLtM/Skh36NE6unu6tsDeU/ZFoYthlTXbBmpIrvosgiDKlWTfb2ZpPELHH89aQjeQw==
+  dependencies:
+    "@typescript-eslint/types" "4.9.1"
+    "@typescript-eslint/visitor-keys" "4.9.1"
+    debug "^4.1.1"
+    globby "^11.0.1"
+    is-glob "^4.0.1"
+    lodash "^4.17.15"
+    semver "^7.3.2"
+    tsutils "^3.17.1"
+
+"@typescript-eslint/visitor-keys@4.9.1":
+  version "4.9.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-4.9.1.tgz#d76374a58c4ead9e92b454d186fea63487b25ae1"
+  integrity sha512-9gspzc6UqLQHd7lXQS7oWs+hrYggspv/rk6zzEMhCbYwPE/sF7oxo7GAjkS35Tdlt7wguIG+ViWCPtVZHz/ybQ==
+  dependencies:
+    "@typescript-eslint/types" "4.9.1"
+    eslint-visitor-keys "^2.0.0"
+
 JSONStream@^1.0.4, JSONStream@^1.3.4, JSONStream@^1.3.5:
   version "1.3.5"
   resolved "https://registry.yarnpkg.com/JSONStream/-/JSONStream-1.3.5.tgz#3208c1f08d3a4d99261ab64f92302bc15e111ca0"
@@ -2637,7 +2779,7 @@ debug@^3.1.0:
   dependencies:
     ms "^2.1.1"
 
-debuglog@*, debuglog@^1.0.1:
+debuglog@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/debuglog/-/debuglog-1.0.1.tgz#aa24ffb9ac3df9a2351837cfb2d279360cd78492"
   integrity sha1-qiT/uaw9+aI1GDfPstJ5NgzXhJI=
@@ -2759,6 +2901,11 @@ diff-sequences@^26.0.0:
   resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-26.0.0.tgz#0760059a5c287637b842bd7085311db7060e88a6"
   integrity sha512-JC/eHYEC3aSS0vZGjuoc4vHA0yAQTzhQQldXMeMF+JlxLGJlCO38Gma82NV9gk1jGFz8mDzUMeaKXvjRRdJ2dg==
 
+diff-sequences@^26.6.2:
+  version "26.6.2"
+  resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-26.6.2.tgz#48ba99157de1923412eed41db6b6d4aa9ca7c0b1"
+  integrity sha512-Mv/TDa3nZ9sbc5soK+OoA74BsS3mL37yixCvUAQkiuA4Wz6YtwP/K47n2rv2ovzHZvoiQeA5FTQOschKkEwB0Q==
+
 dir-glob@^3.0.0, dir-glob@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/dir-glob/-/dir-glob-3.0.1.tgz#56dbf73d992a4a93ba1584f4534063fd2e41717f"
@@ -3056,7 +3203,7 @@ eslint-scope@^5.0.0, eslint-scope@^5.1.0:
     esrecurse "^4.1.0"
     estraverse "^4.1.1"
 
-eslint-utils@^2.1.0:
+eslint-utils@^2.0.0, eslint-utils@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/eslint-utils/-/eslint-utils-2.1.0.tgz#d2de5e03424e707dc10c74068ddedae708741b27"
   integrity sha512-w94dQYoauyvlDc43XnGB8lU3Zt713vNChgt4EWwhXAP2XkBvndfxF0AgIqKOOasjPIPzj9JqgwkwbCYD0/V3Zg==
@@ -3068,6 +3215,11 @@ eslint-visitor-keys@^1.1.0, eslint-visitor-keys@^1.3.0:
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-1.3.0.tgz#30ebd1ef7c2fdff01c3a4f151044af25fab0523e"
   integrity sha512-6J72N8UNa462wa/KFODt/PJ3IU60SDpC3QXC1Hjc1BXXpfL2C9R5+AU7jhe0F6GREqVMh4Juu+NY7xn+6dipUQ==
 
+eslint-visitor-keys@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-2.0.0.tgz#21fdc8fbcd9c795cc0321f0563702095751511a8"
+  integrity sha512-QudtT6av5WXels9WjIM7qz1XD1cWGvX4gGXvp/zBn9nXG02D0utdU3Em2m/QjTnrsk6bBjmCygl3rmj118msQQ==
+
 eslint@^7.0.0:
   version "7.6.0"
   resolved "https://registry.yarnpkg.com/eslint/-/eslint-7.6.0.tgz#522d67cfaea09724d96949c70e7a0550614d64d6"
@@ -3689,6 +3841,18 @@ globby@^11.0.0:
     merge2 "^1.3.0"
     slash "^3.0.0"
 
+globby@^11.0.1:
+  version "11.0.1"
+  resolved "https://registry.yarnpkg.com/globby/-/globby-11.0.1.tgz#9a2bf107a068f3ffeabc49ad702c79ede8cfd357"
+  integrity sha512-iH9RmgwCmUJHi2z5o2l3eTtGBtXek1OYlHrbcxOYugyHLmAsZrPj43OtHThd62Buh/Vv6VyCBD2bdyWcGNQqoQ==
+  dependencies:
+    array-union "^2.1.0"
+    dir-glob "^3.0.1"
+    fast-glob "^3.1.1"
+    ignore "^5.1.4"
+    merge2 "^1.3.0"
+    slash "^3.0.0"
+
 got@^6.7.1:
   version "6.7.1"
   resolved "https://registry.yarnpkg.com/got/-/got-6.7.1.tgz#240cd05785a9a18e561dc1b44b41c763ef1e8db0"
@@ -3955,7 +4119,7 @@ import-local@^3.0.2:
     pkg-dir "^4.2.0"
     resolve-cwd "^3.0.0"
 
-imurmurhash@*, imurmurhash@^0.1.4:
+imurmurhash@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/imurmurhash/-/imurmurhash-0.1.4.tgz#9218b9b2b928a238b13dc4fb6b6d576f231453ea"
   integrity sha1-khi5srkoojixPcT7a21XbyMUU+o=
@@ -4489,6 +4653,16 @@ jest-config@^26.2.2:
     micromatch "^4.0.2"
     pretty-format "^26.2.0"
 
+jest-diff@^26.0.0:
+  version "26.6.2"
+  resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-26.6.2.tgz#1aa7468b52c3a68d7d5c5fdcdfcd5e49bd164394"
+  integrity sha512-6m+9Z3Gv9wN0WFVasqjCL/06+EFCMTqDEUl/b87HYK2rAPTyfz4ZIuSlPhY51PIQRWx5TaxeF1qmXKe9gfN3sA==
+  dependencies:
+    chalk "^4.0.0"
+    diff-sequences "^26.6.2"
+    jest-get-type "^26.3.0"
+    pretty-format "^26.6.2"
+
 jest-diff@^26.2.0:
   version "26.2.0"
   resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-26.2.0.tgz#dee62c771adbb23ae585f3f1bd289a6e8ef4f298"
@@ -4547,6 +4721,11 @@ jest-get-type@^26.0.0:
   resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-26.0.0.tgz#381e986a718998dbfafcd5ec05934be538db4039"
   integrity sha512-zRc1OAPnnws1EVfykXOj19zo2EMw5Hi6HLbFCSjpuJiXtOWAYIjNsHVSbpQ8bDX7L5BGYGI8m+HmKdjHYFF0kg==
 
+jest-get-type@^26.3.0:
+  version "26.3.0"
+  resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-26.3.0.tgz#e97dc3c3f53c2b406ca7afaed4493b1d099199e0"
+  integrity sha512-TpfaviN1R2pQWkIihlfEanwOXK0zcxrKEE4MlU6Tn7keoXdN6/3gK/xl0yEh8DOunn5pOVGKf8hB4R9gVh04ig==
+
 jest-haste-map@^26.2.2:
   version "26.2.2"
   resolved "https://registry.yarnpkg.com/jest-haste-map/-/jest-haste-map-26.2.2.tgz#6d4267b1903854bfdf6a871419f35a82f03ae71e"
@@ -5209,11 +5388,6 @@ lockfile@^1.0.4:
   dependencies:
     signal-exit "^3.0.2"
 
-lodash._baseindexof@*:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/lodash._baseindexof/-/lodash._baseindexof-3.1.0.tgz#fe52b53a1c6761e42618d654e4a25789ed61822c"
-  integrity sha1-/lK1OhxnYeQmGNZU5KJXie1hgiw=
-
 lodash._baseuniq@~4.6.0:
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/lodash._baseuniq/-/lodash._baseuniq-4.6.0.tgz#0ebb44e456814af7905c6212fa2c9b2d51b841e8"
@@ -5222,33 +5396,11 @@ lodash._baseuniq@~4.6.0:
     lodash._createset "~4.0.0"
     lodash._root "~3.0.0"
 
-lodash._bindcallback@*:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/lodash._bindcallback/-/lodash._bindcallback-3.0.1.tgz#e531c27644cf8b57a99e17ed95b35c748789392e"
-  integrity sha1-5THCdkTPi1epnhftlbNcdIeJOS4=
-
-lodash._cacheindexof@*:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/lodash._cacheindexof/-/lodash._cacheindexof-3.0.2.tgz#3dc69ac82498d2ee5e3ce56091bafd2adc7bde92"
-  integrity sha1-PcaayCSY0u5ePOVgkbr9Ktx73pI=
-
-lodash._createcache@*:
-  version "3.1.2"
-  resolved "https://registry.yarnpkg.com/lodash._createcache/-/lodash._createcache-3.1.2.tgz#56d6a064017625e79ebca6b8018e17440bdcf093"
-  integrity sha1-VtagZAF2JeeevKa4AY4XRAvc8JM=
-  dependencies:
-    lodash._getnative "^3.0.0"
-
 lodash._createset@~4.0.0:
   version "4.0.3"
   resolved "https://registry.yarnpkg.com/lodash._createset/-/lodash._createset-4.0.3.tgz#0f4659fbb09d75194fa9e2b88a6644d363c9fe26"
   integrity sha1-D0ZZ+7CddRlPqeK4imZE02PJ/iY=
 
-lodash._getnative@*, lodash._getnative@^3.0.0:
-  version "3.9.1"
-  resolved "https://registry.yarnpkg.com/lodash._getnative/-/lodash._getnative-3.9.1.tgz#570bc7dede46d61cdcde687d65d3eecbaa3aaff5"
-  integrity sha1-VwvH3t5G1hzc3mh9ZdPuy6o6r/U=
-
 lodash._root@~3.0.0:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/lodash._root/-/lodash._root-3.0.1.tgz#fba1c4524c19ee9a5f8136b4609f017cf4ded692"
@@ -5284,11 +5436,6 @@ lodash.isstring@^4.0.1:
   resolved "https://registry.yarnpkg.com/lodash.isstring/-/lodash.isstring-4.0.1.tgz#d527dfb5456eca7cc9bb95d5daeaf88ba54a5451"
   integrity sha1-1SfftUVuynzJu5XV2ur4i6VKVFE=
 
-lodash.restparam@*:
-  version "3.6.1"
-  resolved "https://registry.yarnpkg.com/lodash.restparam/-/lodash.restparam-3.6.1.tgz#936a4e309ef330a7645ed4145986c85ae5b20805"
-  integrity sha1-k2pOMJ7zMKdkXtQUWYbIWuWyCAU=
-
 lodash.sortby@^4.7.0:
   version "4.7.0"
   resolved "https://registry.yarnpkg.com/lodash.sortby/-/lodash.sortby-4.7.0.tgz#edd14c824e2cc9c1e0b0a1b42bb5210516a42438"
@@ -5949,7 +6096,6 @@ npm@^6.10.3:
     cmd-shim "^3.0.3"
     columnify "~1.5.4"
     config-chain "^1.1.12"
-    debuglog "*"
     detect-indent "~5.0.0"
     detect-newline "^2.1.0"
     dezalgo "~1.0.3"
@@ -5964,7 +6110,6 @@ npm@^6.10.3:
     has-unicode "~2.0.1"
     hosted-git-info "^2.8.8"
     iferr "^1.0.2"
-    imurmurhash "*"
     infer-owner "^1.0.4"
     inflight "~1.0.6"
     inherits "^2.0.4"
@@ -5983,14 +6128,8 @@ npm@^6.10.3:
     libnpx "^10.2.2"
     lock-verify "^2.1.0"
     lockfile "^1.0.4"
-    lodash._baseindexof "*"
     lodash._baseuniq "~4.6.0"
-    lodash._bindcallback "*"
-    lodash._cacheindexof "*"
-    lodash._createcache "*"
-    lodash._getnative "*"
     lodash.clonedeep "~4.5.0"
-    lodash.restparam "*"
     lodash.union "~4.6.0"
     lodash.uniq "~4.5.0"
     lodash.without "~4.4.0"
@@ -6606,6 +6745,16 @@ prettier@^2.0.5:
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.0.5.tgz#d6d56282455243f2f92cc1716692c08aa31522d4"
   integrity sha512-7PtVymN48hGcO4fGjybyBSIWDsLU4H4XlvOHfq91pz9kkGlonzwTfYkaIEwiRg/dAJF9YlbsduBAgtYLi+8cFg==
 
+pretty-format@^26.0.0, pretty-format@^26.6.2:
+  version "26.6.2"
+  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-26.6.2.tgz#e35c2705f14cb7fe2fe94fa078345b444120fc93"
+  integrity sha512-7AeGuCYNGmycyQbCqd/3PWH4eOoX/OiCa0uphp57NVTeAGdJGaAliecxwBDHYQCIvrW7aDBZCYeNTP/WX69mkg==
+  dependencies:
+    "@jest/types" "^26.6.2"
+    ansi-regex "^5.0.0"
+    ansi-styles "^4.0.0"
+    react-is "^17.0.1"
+
 pretty-format@^26.2.0:
   version "26.2.0"
   resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-26.2.0.tgz#83ecc8d7de676ff224225055e72bd64821cec4f1"
@@ -6765,6 +6914,11 @@ react-is@^16.12.0:
   resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.13.0.tgz#0f37c3613c34fe6b37cd7f763a0d6293ab15c527"
   integrity sha512-GFMtL0vHkiBv9HluwNZTggSn/sCyEt9n02aM0dSAjGGyqyNlAyftYm4phPxdvCigG15JreC5biwxCgTAJZ7yAA==
 
+react-is@^17.0.1:
+  version "17.0.1"
+  resolved "https://registry.yarnpkg.com/react-is/-/react-is-17.0.1.tgz#5b3531bd76a645a4c9fb6e693ed36419e3301339"
+  integrity sha512-NAnt2iGDXohE5LI7uBnLnqvLQMtzhkiAOLXTmv+qnF9Ky7xAPcX8Up/xWIhxvLVGJvuLiNc4xQLtuqDRzb4fSA==
+
 read-cmd-shim@^1.0.1, read-cmd-shim@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/read-cmd-shim/-/read-cmd-shim-1.0.5.tgz#87e43eba50098ba5a32d0ceb583ab8e43b961c16"
@@ -6978,7 +7132,7 @@ regex-not@^1.0.0, regex-not@^1.0.2:
     extend-shallow "^3.0.2"
     safe-regex "^1.1.0"
 
-regexpp@^3.1.0:
+regexpp@^3.0.0, regexpp@^3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/regexpp/-/regexpp-3.1.0.tgz#206d0ad0a5648cffbdb8ae46438f3dc51c9f78e2"
   integrity sha512-ZOIzd8yVsQQA7j8GCSlPGXwg5PfmA1mrq0JP4nGhh54LaKN3xdai/vHUDu74pKwV8OxseMS65u2NImosQcSD0Q==
@@ -8111,6 +8265,11 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
+typescript@^4.1.3:
+  version "4.1.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.3.tgz#519d582bd94cba0cf8934c7d8e8467e473f53bb7"
+  integrity sha512-B3ZIOf1IKeH2ixgHhj6la6xdwR9QrLC5d1VKeCSY4tvkqhF2eqd9O7txNlS0PO3GrBAFIdr3L1ndNwteUbZLYg==
+
 uglify-js@^3.1.4:
   version "3.8.0"
   resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.8.0.tgz#f3541ae97b2f048d7e7e3aa4f39fd8a1f5d7a805"